Date   

"New" and "older" PL-380s

grace123moscow
 

I have a PL-380 (#36920091000996). I'm not sure how old it is. What advantages are there in purchasing a "New" model? Thanks for helping me understand...

John Washburn
Vermont


MI LOG

wa8lcz
 

Jan 13
0920 CKNX ONT Wingham 10k 1k 1903 EST
0920 WHJJ RI Providence 5k 5k 1906 EST 590 mi New state#28

Jan 14
1250 WNEM MI Bridgeport 0812 EST


After passing 150 stations heard, the old hunt and peck method wasnt working, too many dupes and too many wasted nights listening with no new log entrys. i started using the MWLIST and sticking on a frequency. its responsible for SC and RI, so its working. on the 920 kc freq, i could possibly hear RI to the east, SD to the west, AR to the south, just by rotating the radio. its not as exciting but it works.

the M40W radio has many images, 1300 appears on 1310, etc, and its coverage stops at 1670 kc. i wonder if anyone has any experience with the new M37W, if so, I would like to hear about it. the M40W was first made in 1988.

the M40W is almost as sensitive and quiet as the SRF-59, but has better selectivity (at the high end of the band), digital readout, MUCH easier to tune and 7 memories. overall, a more enjoyable radio to operate.

Congrats to Kirk Allen, not only for 150 Latino stations but for using a SRF-59 to tune them in. thats impressive.

also, i wonder how many states anyone can hear on an ultra lite radio from one location ? whats the record ?

Byron wa8lcz nr Detroit Mi, ulr Sony SRF-M40W


Upgraded Tecsun PL-310 Internal Loopstick-- Moderate Success

Gary DeBock
 

Hello All,
 
After the second 7.5" loopstick transplant job on another Tecsun PL-380 model was completed here recently (according to the procedure described at  http://www.mediafire.com/?hudn0mtlueg , with similar excellent results), there was some brief spare time to attempt improving the PL-310 stock loopstick.
 
After receiving several cylindrical type 61 ferrite bars from Amidon in various diameters, it quickly became apparent that the limited cabinet space in the PL-310 (designed for a very flat loopstick) would not accomodate any of these cylindrical bars without major "plastic surgery"-- an unacceptable option. The new loopstick needed to fit inside the cabinet, with no huge, messy cutouts.
 
In the absence of a type 61 ferrite bar identical in size and shape to the stock bar, my only logical option was to take the stock PL-310 ferrite bar, and create a new coil using the superior 40/44 Litz wire-- that would hopefully tune the entire AM band with improved sensitivity, and no Si4734 varactor lock-up on the high band frequencies. This seemed like quite a challenge.
 
Starting with the 554 uh, 113 turn 40/44 Litz wire coil wound on the stock ferrite bar (described in an earlier experiment, which greatly improved both LW and low-band AM sensitivity, but was inferior to the stock model on frequencies above 1350 kHz), I decided on a fairly low-tech strategy-- remove the coil turns one by one during live signal reception on the PL-310's high band, until the lower inductance unlocked the DSP chip varactor for normal high-band operation (and hopefully improved sensitivity).
 
After subtracting many coil turns and lowering the coil inductance to 416 uh, the PL-310's high band suddenly sprang to life in a booming rush, providing excellent reception of the 1670 kHz Redding, CA station. I then checked the sensitivity of this newly modified PL-310 across the AM band, and found an average increase of about 5 dBu in RSSI readings from 530 to 1700 kHz-- certainly not the booming increase provided by the 7.5" transplanted loopsticks, but significant enough to make a slight difference in reception of several weak stations. One fringe benefit of the procedure was to slightly improve the irritating "soft mute" issue on certain frequencies, because the slightly stronger signal levels didn't make the PL-310 kick in the "soft mute" so quickly.
 
This moderate sensitivity boost was obtained mainly by the substitution of higher quality 40/44 Litz wire for the unknown Chinese Litz wire, but the increase in coil inductance also had some apparent effect in maximizing sensitivity (since the 554 uh inductance provided even higher sensitivity on the low band, but had the unfortunate side-effect of the DSP chip varactor lockout on the high band).
 
Further tests will continue on this modified PL-310 today. Thanks to all with interest in this new experimentation, and your messages of support (which are greatly appreciated).
 
73, Gary DeBock (in Puyallup, WA, USA)
 
 


Re: Early results of 7.5" Amidion rod

Gary DeBock
 

Hi Roy,
 
Thanks for your comments, and experimental results.
 
I don't know if you received the previous message, but in the case of the Tecsun PL-300WT/ Grundig G8 models, Steve and I never wound an 81-turn coil on the 7.5" Amidon type 61 ferrite bar. We were able to find the optimum loopstick coil inductance value for each model by removing the wax from the stock loopstick coil, then sliding the coil along the ferrite bar to peak the AM sensitivity during live signal reception. We would then record this inductance value (which was always between 180-450 uh, and usually pretty close to 300 uh) and then either secure the stock coil in this new position (for stock model optimum AM sensitivity) or remove the stock loopstick and use this optimum inductance value in a transplanted 7.5" loopstick (by winding a fixed 40/44 Litz wire coil of the same inductance on the Amidon type 61 ferrite bar). In either case, maximum AM sensitivity was then obtained for the size of either loopstick.
 
This approach is not possible with the D96L, PL-310 or PL-380 loopsticks, because the stock coil Litz wire turns are glued on the ferrite bar, and the coil cannot be shifted on the bar, as in the G8/ PL-300WT models. This is why an 81-turn Slider coil was constructed for use on the 7.5" Amidon ferrite bar, to provide the same function of shifting the inductance to peak the AM sensitivity during live signal reception, then matching this optimum inductance in a transplanted loopstick.
 
Since most of the PL-300WT/ G8 models had an optimum matching inductance fairly close to 300 uh, if you wind a coil of similar inductance on your 7.5" type 61 bar, you will probably achieve a great increase in AM sensitivity across the band, relative to the stock G8. If you wish to fine-tune the optimum inductance to the exact value, you can slide the stock loopstick coil during live AM signal reception (as described above), then match the related inductance value in a new 7.5" loopstick coil. This was the procedure Steve and I used to provide 7.5" loopstick G8 and PL-300WT models for about 7 different DXers, all of which had excellent AM sensitivity across the band.
 
I hope this information will be useful in your experiments, and thanks again for your participation.
 
73, Gary   
 

In a message dated 1/14/2010 1:14:13 A.M. Pacific Standard Time, roy.dyball@... writes:
 

Thank you Gary and Neil.

Having the Si4734 tell you what's going on regarding the capacitance/inductance of the loopstick is a real bonus and makes fine tuning easy. Gary I think the 81 turn coil is too big. The 81 turn coil really worked well on LW, it was almost 45 dbu and 25 S/n db above the stock PL-310 on my local NDB (311Khz). At 81 turns the G8 reported the inductance as 630 uh at 520Khz.

Neil I would not hesitate to use your ferrite rod to practice with until your Amidon rod arrives. I would use the wire wrap wire and work on a coil length of 30mm or 60mm for spaced winding (just wind two wires together then unwind one).

I also have never heard a station from Western Australia. Receiving 1323 Cruise AM last night is my best so far (1600KM) without an external aerial. I woke up about 3AM and just had to try the 7.5 inch Amidon, admittedly  I had turned off the soft mute on the G8 and had selected 2Khz bandwidth. I find 1Khz although showing better S/N can be a bit muffled when you are trying to get an ID.

Winding coils is fast and easy with these little Tecsun's so wind a couple of different configurations and compare them. I hope it works out well.

Cheers Roy

--- In ultralightdx@yahoogroups.com, D1028Gary@... wrote:
>
> Hello Roy and Neil,
>
> Thanks for your comments on our group, Neil.
>
> Roy, in my previous post there was a description of the method that Steve
> Ratzlaff and I used to optimize AM reception in the Tecsun PL-300WT and G8
> models, and to determine the optimum loopstick coil inductance for peak AM
> sensitivity in the stock models (and in the 7.5" Amidon loopstick transplant
> models). That procedure is actually described in a file posted in our
> Ultralightdx site (under modifications), and is also directly linked at
> _http://www.mediafire.com/?jyjg5hmkyqm_ (http://www.mediafire.com/?jyjg5hmkyqm) .
>
> Once we determined the optimum loopstick coil inductance for peak AM
> sensitivity in the models, we simply wound a fixed 40/44 Litz wire coil of the
> same inductance on the 7.5" Amidon ferrite bar, and obtained great results
> every time. Although their AM sensitivity was equal to the best of the
> modified Ultralights, unfortunately the fixed 3 kHz DSP selectivity in the 7.5"
> loopstick PL-300WT/ G8 models made them uncompetitive in transoceanic DXing
> when compared to the CFJ455K5 filter-modified E100 Slider and SWP Slider
> 7.5" loopstick models, so we didn't make too many of the modified PL-300WT/
> G8 models last spring.
>
> 73 and Good DX, Gary
>
>
>
>
>
>
> In a message dated 1/13/2010 5:51:24 P.M. Pacific Standard Time,
> neil.findlay52@... writes:
>
>
>
>
>
> Hi all
> And a question to Roy
>
> Currently using a 310 and a 380 with my Palstar R30a with 3 Kaz antennae
> as my spotter reciever
>
> Just got my order of 40/44 litz wire, not yet got the Amidon rods. I do
> have a flat rod of unknown
> ferrite type ( probably bought from local electronics supplier years ago )
> it is 7&7/8 inch long by
> 3/4inch by 3/16 inch - The comment seem to indicate that flat is not ideal
> but at that size would it
> be worth a try. I am off work / working from home at around 40% for two
> weeks after a minor
> operation so will have some time and the Amidon rods wont arrive in that
> time.
>
> Roy
> I am interested in what ypu have been able to hear from the East and North
> East also have you
> ever heard a Western Australian station. I live at Rothwell ( on the edge
> of Deception Bay) just
> going off the Redcliffe Peninsular. I have heard Fiji and many New
> Zealanders. I can hear a lot
> of asians but not good at recognising the languages. My son knows some
> japanes e and can rcognise
> so will try for some of the powerhouses that Gary hears ie 747 etc. I have
> never heard a West Aust
> yet. My other project is to get the Vactrol connected to the 3 Kaz antenna
> and wind a coupling on to
> the 380 - I have some wire wrap from years ago computer projects.
>
> This is the best group that I have part of in Medium Wave - a most
> co-operative group covering
> listening and technical even part of the design team of our prime chip.
> Thank you for everyones effort
> and for making the information available
>
> Neil
>
>
>
> ____________________________________
> From: Roy roy.dyball@...
> To: ultralightdx@ ultrali
> Sent: Thu, 14 January, 2010 10:50:38 AM
> Subject: [ultralightdx] Early results of 7.5" Amidion rod
>
>
> Hi All
> The first coil was wound on the 7.5 inch rod with 165/46 spaced using
> 0.7mm solder as the spacer which is about the same size as the Litz, wound over
> 110mm centred on the rod. The capacitance reported by the G8 showed it had
> bottomed out at 1710Khz. I removed 2mm from each end and the capacitance
> showed 18 Pf at 1710Khz (7pf is the lowest). This resulted in aprox 15dbu
> increase on the G8 when compared to a stock PL-310 set a 3Khz bandwidth,
> holding this to the end of the band.
> I was able to hear a station in another state on 1323Mhz (Cruise AM in
> Adelaide) last night that I have tried on and off and have never been able to
> receive at a distance of over 1600 KM (great circle) while listening with
> the radio on my bed side table.
> I then decided to emulate Gary's 81 turn 40/44 coil starting at 43mm. The
> G8 reported it was bottoming out of capacitance at 1540Khz. I ran my
> standard tests and found this configuration was performing the same as the 165/46
> coil at the bottom of the band but was dropping off by around 1200Khz (2-3
> dbu).
> I had to unwind 18 turns to get the G8 to report a value of 12pf at
> 1710Khz. This only dropped the very end of the (low) band by 2 dbu but had
> started to pick up by 1200Khz. I won't know how well it performs until tonight
> when the high end of the band opens. For now it is performing aprox 13dbu
> better than the stock PL-310.
> Gary has reported that his coil shows a better improvement when fitted to
> the 380 than the 310. Probably this coil would perform better in the PL-380
> than the G8. I will try that later. I am also going to rewind the first
> coil but use 0.5mm spacing.
>
> Roy.
>
>
>
>
>
>
> ____________________________________
> See what's on at the movies i n your area. _Find out now_
> (http://au.rd.yahoo.com/movies/mailtagline/*http://au.movies.yahoo.com/session-times/) .
>


Re: Early results of 7.5" Amidion rod

Roy <roy.dyball@...>
 

Thank you Gary and Neil.

Having the Si4734 tell you what's going on regarding the capacitance/inductance of the loopstick is a real bonus and makes fine tuning easy. Gary I think the 81 turn coil is too big. The 81 turn coil really worked well on LW, it was almost 45 dbu and 25 S/n db above the stock PL-310 on my local NDB (311Khz). At 81 turns the G8 reported the inductance as 630 uh at 520Khz.

Neil I would not hesitate to use your ferrite rod to practice with until your Amidon rod arrives. I would use the wire wrap wire and work on a coil length of 30mm or 60mm for spaced winding (just wind two wires together then unwind one).

I also have never heard a station from Western Australia. Receiving 1323 Cruise AM last night is my best so far (1600KM) without an external aerial. I woke up about 3AM and just had to try the 7.5 inch Amidon, admittedly  I had turned off the soft mute on the G8 and had selected 2Khz bandwidth. I find 1Khz although showing better S/N can be a bit muffled when you are trying to get an ID.

Winding coils is fast and easy with these little Tecsun's so wind a couple of different configurations and compare them. I hope it works out well.

Cheers Roy

--- In ultralightdx@..., D1028Gary@... wrote:
>
> Hello Roy and Neil,
>
> Thanks for your comments on our group, Neil.
>
> Roy, in my previous post there was a description of the method that Steve
> Ratzlaff and I used to optimize AM reception in the Tecsun PL-300WT and G8
> models, and to determine the optimum loopstick coil inductance for peak AM
> sensitivity in the stock models (and in the 7.5" Amidon loopstick transplant
> models). That procedure is actually described in a file posted in our
> Ultralightdx site (under modifications), and is also directly linked at
> _http://www.mediafire.com/?jyjg5hmkyqm_ (http://www.mediafire.com/?jyjg5hmkyqm) .
>
> Once we determined the optimum loopstick coil inductance for peak AM
> sensitivity in the models, we simply wound a fixed 40/44 Litz wire coil of the
> same inductance on the 7.5" Amidon ferrite bar, and obtained great results
> every time. Although their AM sensitivity was equal to the best of the
> modified Ultralights, unfortunately the fixed 3 kHz DSP selectivity in the 7.5"
> loopstick PL-300WT/ G8 models made them uncompetitive in transoceanic DXing
> when compared to the CFJ455K5 filter-modified E100 Slider and SWP Slider
> 7.5" loopstick models, so we didn't make too many of the modified PL-300WT/
> G8 models last spring.
>
> 73 and Good DX, Gary
>
>
>
>
>
>
> In a message dated 1/13/2010 5:51:24 P.M. Pacific Standard Time,
> neil.findlay52@... writes:
>
>
>
>
>
> Hi all
> And a question to Roy
>
> Currently using a 310 and a 380 with my Palstar R30a with 3 Kaz antennae
> as my spotter reciever
>
> Just got my order of 40/44 litz wire, not yet got the Amidon rods. I do
> have a flat rod of unknown
> ferrite type ( probably bought from local electronics supplier years ago )
> it is 7&7/8 inch long by
> 3/4inch by 3/16 inch - The comment seem to indicate that flat is not ideal
> but at that size would it
> be worth a try. I am off work / working from home at around 40% for two
> weeks after a minor
> operation so will have some time and the Amidon rods wont arrive in that
> time.
>
> Roy
> I am interested in what ypu have been able to hear from the East and North
> East also have you
> ever heard a Western Australian station. I live at Rothwell ( on the edge
> of Deception Bay) just
> going off the Redcliffe Peninsular. I have heard Fiji and many New
> Zealanders. I can hear a lot
> of asians but not good at recognising the languages. My son knows some
> japanese and can rcognise
> so will try for some of the powerhouses that Gary hears ie 747 etc. I have
> never heard a West Aust
> yet. My other project is to get the Vactrol connected to the 3 Kaz antenna
> and wind a coupling on to
> the 380 - I have some wire wrap from years ago computer projects.
>
> This is the best group that I have part of in Medium Wave - a most
> co-operative group covering
> listening and technical even part of the design team of our prime chip.
> Thank you for everyones effort
> and for making the information available
>
> Neil
>
>
>
> ____________________________________
> From: Roy roy.dyball@...
> To: ultralightdx@ ultrali
> Sent: Thu, 14 January, 2010 10:50:38 AM
> Subject: [ultralightdx] Early results of 7.5" Amidion rod
>
>
> Hi All
> The first coil was wound on the 7.5 inch rod with 165/46 spaced using
> 0.7mm solder as the spacer which is about the same size as the Litz, wound over
> 110mm centred on the rod. The capacitance reported by the G8 showed it had
> bottomed out at 1710Khz. I removed 2mm from each end and the capacitance
> showed 18 Pf at 1710Khz (7pf is the lowest). This resulted in aprox 15dbu
> increase on the G8 when compared to a stock PL-310 set a 3Khz bandwidth,
> holding this to the end of the band.
> I was able to hear a station in another state on 1323Mhz (Cruise AM in
> Adelaide) last night that I have tried on and off and have never been able to
> receive at a distance of over 1600 KM (great circle) while listening with
> the radio on my bed side table.
> I then decided to emulate Gary's 81 turn 40/44 coil starting at 43mm. The
> G8 reported it was bottoming out of capacitance at 1540Khz. I ran my
> standard tests and found this configuration was performing the same as the 165/46
> coil at the bottom of the band but was dropping off by around 1200Khz (2-3
> dbu).
> I had to unwind 18 turns to get the G8 to report a value of 12pf at
> 1710Khz. This only dropped the very end of the (low) band by 2 dbu but had
> started to pick up by 1200Khz. I won't know how well it performs until tonight
> when the high end of the band opens. For now it is performing aprox 13dbu
> better than the stock PL-310.
> Gary has reported that his coil shows a better improvement when fitted to
> the 380 than the 310. Probably this coil would perform better in the PL-380
> than the G8. I will try that later. I am also going to rewind the first
> coil but use 0.5mm spacing.
>
> Roy.
>
>
>
>
>
>
> ____________________________________
> See what's on at the movies in your area. _Find out now_
> (http://au.rd.yahoo.com/movies/mailtagline/*http://au.movies.yahoo.com/session-times/) .
>


Re: Mexican Loggings

Kirk <kirk74601@...>
 

Scott,

I have a very helpful guide to pronouncing Spanish letters and numbers that I'd be happy to share with anyone interested. I'm emailing one to you, Scott. The main reason I can sometimes ID SS speaking stations boils down to plain ole experience. I've spent hundreds and hundreds of hours listening to radio stations broadcasting in SS on shortwave beginning in the 1970's. Through the years I've read many good references for understanding key words and or phrases as hrd on the air. A tool available to us that wasn't around back in my earlier days of DX'ing is the internet! Try googling for references to look over. There's many available out there. One other suggestion is to find some SS stations that have internet streaming audio available and just listen. Fred Cantu has a great website that will allow you to hear Mexican stations w/ no QRM at all, hi hi.
Hope this helps maybe a little.

Kirk Allen
Pasadena, TX

--- In ultralightdx@..., Scott <scottmac1120@...> wrote:

Wow, Kirk, I don't know how you can do it. Those XEs (and all Spanish-
language stations, for that matter) just annoy me because I have no
way of identifying them. I've probably heard most of what you've heard
on my SRF-59, and just don't know it. Any pointers or tips, anyone?

Scott

Sent from my iPod

On Jan 13, 2010, at 9:24 PM, "Kirk" <kirk74601@...> wrote:

Hi Gang,

Not much listening has been going on around here lately, but last
night I was able to do some tuning around w/ the SRF-59 used
barefoot. One new station was hrd and another tentative, both out of
Mexico. 1090 kHz has a lot more potential for other XE loggings
besides the ones below.

1090, XEHR, Puebla, PU, 0200 UTC, 1/13/10, surprised to hear this
frequency really opening up with 3 or 4 XE stations audible in a big
pile up. Monitored this channel on and off for 3 hours. Started
hearing some "Grupo Formula" references @ 2332 punching through the
co-channel QRM from the strong XEMCA (Veracruz) and others. Noted
one "Radio Cinco" ID. Full ID @0200 w/ call letters.

1090, (T), XEWL, Nuevo Laredo, TM, 2312 UTC, 1/12/10, I hrd one
tentative "Doble U Radio" ID that popped up when this freq started
coming to life right around the sunset enhancement period. Calling
this one tentative for now. Hope I didnh't miss my only opportunity
to catch this one.

Thanks for the kind words lately. I'd like to say a big congrats to
Byron for his latest awards. Also to all other members having logged
some great new catches in the last month--a hearty congrats and keep
on keepin' on w/ your milestones!
73 for now,

Kirk Allen
Pasadena, TX


Re: Mexican Loggings

Scott <scottmac1120@...>
 

Wow, Kirk, I don't know how you can do it. Those XEs (and all Spanish-language stations, for that matter) just annoy me because I have no way of identifying them. I've probably heard most of what you've heard on my SRF-59, and just don't know it. Any pointers or tips, anyone?

Scott

Sent from my iPod

On Jan 13, 2010, at 9:24 PM, "Kirk" <kirk74601@...> wrote:

 

Hi Gang,

Not much listening has been going on around here lately, but last night I was able to do some tuning around w/ the SRF-59 used barefoot. One new station was hrd and another tentative, both out of Mexico. 1090 kHz has a lot more potential for other XE loggings besides the ones below.

1090, XEHR, Puebla, PU, 0200 UTC, 1/13/10, surprised to hear this frequency really opening up with 3 or 4 XE stations audible in a big pile up. Monitored this channel on and off for 3 hours. Started hearing some "Grupo Formula" references @ 2332 punching through the co-channel QRM from the strong XEMCA (Veracruz) and others. Noted one "Radio Cinco" ID. Full ID @0200 w/ call letters.

1090, (T), XEWL, Nuevo Laredo, TM, 2312 UTC, 1/12/10, I hrd one tentative "Doble U Radio" ID that popped up when this freq started coming to life right around the sunset enhancement period. Calling this one tentative for now. Hope I didnh't miss my only opportunity to catch this one.

Thanks for the kind words lately. I'd like to say a big congrats to Byron for his latest awards. Also to all other members having logged some great new catches in the last month--a hearty congrats and keep on keepin' on w/ your milestones!
73 for now,

Kirk Allen
Pasadena, TX


Mexican Loggings

Kirk <kirk74601@...>
 

Hi Gang,

Not much listening has been going on around here lately, but last night I was able to do some tuning around w/ the SRF-59 used barefoot. One new station was hrd and another tentative, both out of Mexico. 1090 kHz has a lot more potential for other XE loggings besides the ones below.

1090, XEHR, Puebla, PU, 0200 UTC, 1/13/10, surprised to hear this frequency really opening up with 3 or 4 XE stations audible in a big pile up. Monitored this channel on and off for 3 hours. Started hearing some "Grupo Formula" references @ 2332 punching through the co-channel QRM from the strong XEMCA (Veracruz) and others. Noted one "Radio Cinco" ID. Full ID @0200 w/ call letters.

1090, (T), XEWL, Nuevo Laredo, TM, 2312 UTC, 1/12/10, I hrd one tentative "Doble U Radio" ID that popped up when this freq started coming to life right around the sunset enhancement period. Calling this one tentative for now. Hope I didnh't miss my only opportunity to catch this one.

Thanks for the kind words lately. I'd like to say a big congrats to Byron for his latest awards. Also to all other members having logged some great new catches in the last month--a hearty congrats and keep on keepin' on w/ your milestones!
73 for now,

Kirk Allen
Pasadena, TX


New Log- WWCB-1370

John Cereghin <jcereghin@...>
 

Sat on 1370 for a while tonight and was surprised by 1370-WWCB in
Corry PA with two call IDs at 2245. Couldn't discern the programming
as it was mixing badly with WSPD and WXXI, but two good IDs for UL
station #663., also a new one for my master log, station number 881.
Heard on the PL-310 barefoot.

John Cereghin
Smyrna DE


FM DX Tonight?

Scott <scottmac1120@...>
 

Hey all:

Anybody else tried the FM band out tonight? I'm getting very unusually strong reception on many stations I've never heard before!

Scott
Hobbs, New Mexico


Re: Tecsun PL-310/380 Inductive Coupling to External Antennas

Gary Kinsman
 

Hi Scott,

When I use the Q-Stick with my 7600GR, I reduce the signal strength using the attenuator, peak the Q-Stick, and then increase the signal strength using the attenuator. I find that using this technique makes it easier to optimize the tuning on the Q-Stick.

Regards,
Gary

--- In ultralightdx@..., "sdwillingham" <sdwillingham@...> wrote:

Gary,

I've also found the Q-stick+ difficult to use with the Tecsun radios (and often with my ICF-SW7600GR which doesn't have a good tuning indicator). In my opinion, there are three reasons for this.


Cheers,
Scott


TECH: PL310 stock loopstick tested

Steve Ratzlaff <steveratz@...>
 

I removed the Tecsun PL310 stock loopstick today and checked it on the HP4342A Q meter. Since this model ULR is about the only one that will receive anything on LF (my closest LF NDB is 20 miles away, on 296 kHz), I was curious how the loopstick measured. Bottom line is this loopstick works has very low Q at MW above about 1000 kHz and is optimized more for LF reception!
I will have to check the loopstick in my PL380 next and see if it's similar, though that model doesn't hear anything on LF even though the loopsticks look the same visually.

The PL310 loopstick measured 322 uH at 796 kHz, with a Q of 86. (The Q meter uses certain fixed frequencies on various ranges when measuring inductance; a range is chosen to peak the Q for a given inductance being tested, then the inductance is read off the dial.)

1500 kHz Q 20 (that's the highest frequency I could check Q at since the Q meter's variable cap was at its minimum setting)
1300 kHz Q 31
900 kHz Q 71
700 kHz Q 106
530 kHz Q 160
500 kHz Q 172
400 kHz Q 203
300 kHz Q 228
200 kHz Q 229

73,
Steve


Re: Early results of 7.5" Amidion rod

neil.findlay52
 

Hi all
And a question to Roy
 
Currently using a 310 and a 380 with my Palstar R30a with 3 Kaz antennae as my spotter reciever
 
Just got my order of 40/44 litz wire, not yet got the Amidon rods. I do have a flat rod of unknown
ferrite type ( probably bought from local electronics supplier years ago ) it is 7&7/8 inch long by
3/4inch by 3/16 inch - The comment seem to indicate that flat is not ideal but at that size would it
be worth a try. I am off work / working from home at around 40% for two weeks after a minor
operation so will have some time and the Amidon rods wont arrive in that time. 
 
Roy
I am interested in what ypu have been able to hear from the East and North East also have you
ever heard a Western Australian station. I live at Rothwell ( on the edge of Deception Bay) just
going off the Redcliffe Peninsular. I have heard Fiji and many New Zealanders. I can hear a lot
of asians but not good at recognising the languages. My son knows some japanese and can rcognise
so will try for some of the powerhouses that Gary hears ie 747 etc. I have never heard a West Aust
yet. My other project is to get the Vactrol connected to the 3 Kaz antenna and wind a coupling on to
the 380 - I have some wire wrap from years ago computer projects.
 
This is the best group that I have part of in Medium Wave - a most co-operative group covering
listening and technical even part of the design team of our prime chip. Thank you for everyones effort
and for making the information available
 
Neil    


From: Roy
To: ultralightdx@...
Sent: Thu, 14 January, 2010 10:50:38 AM
Subject: [ultralightdx] Early results of 7.5" Amidion rod

 

Hi All

The first coil was wound on the 7.5 inch rod with 165/46 spaced using 0.7mm solder as the spacer which is about the same size as the Litz, wound over 110mm centred on the rod. The capacitance reported by the G8 showed it had bottomed out at 1710Khz. I removed 2mm from each end and the capacitance showed 18 Pf at 1710Khz (7pf is the lowest). This resulted in aprox 15dbu increase on the G8 when compared to a stock PL-310 set a 3Khz bandwidth, holding this to the end of the band.

I was able to hear a station in another state on 1323Mhz (Cruise AM in Adelaide) last night that I have tried on and off and have never been able to receive at a distance of over 1600 KM (great circle) while listening with the radio on my bed side table.

I then decided to emulate Gary's 81 turn 40/44 coil starting at 43mm. The G8 reported it was bottoming out of capacitance at 1540Khz. I ran my standard tests and found this configuration was performing the same as the 165/46 coil at the bottom of the band but was dropping off by around 1200Khz (2-3 dbu).

I had to unwind 18 turns to get the G8 to report a value of 12pf at 1710Khz. This only dropped the very end of the (low) band by 2 dbu but had started to pick up by 1200Khz. I won't know  how well it performs until tonight when the high end of the band opens.  For now it is performing aprox 13dbu better than the stock PL-310.

Gary has reported that his coil shows a better improvement when fitted to the 380 than the 310. Probably this coil would perform better in the PL-380 than the G8. I will try that later. I am also going to rewind the first coil but use 0.5mm spacing.

Roy.

 



See what's on at the movies in your area. Find out now.


Early results of 7.5" Amidion rod

Roy <roy.dyball@...>
 

Hi All

The first coil was wound on the 7.5 inch rod with 165/46 spaced using 0.7mm solder as the spacer which is about the same size as the Litz, wound over 110mm centred on the rod. The capacitance reported by the G8 showed it had bottomed out at 1710Khz. I removed 2mm from each end and the capacitance showed 18 Pf at 1710Khz (7pf is the lowest). This resulted in aprox 15dbu increase on the G8 when compared to a stock PL-310 set a 3Khz bandwidth, holding this to the end of the band.

I was able to hear a station in another state on 1323Mhz (Cruise AM in Adelaide) last night that I have tried on and off and have never been able to receive at a distance of over 1600 KM (great circle) while listening with the radio on my bed side table.

I then decided to emulate Gary's 81 turn 40/44 coil starting at 43mm. The G8 reported it was bottoming out of capacitance at 1540Khz. I ran my standard tests and found this configuration was performing the same as the 165/46 coil at the bottom of the band but was dropping off by around 1200Khz (2-3 dbu).

I had to unwind 18 turns to get the G8 to report a value of 12pf at 1710Khz. This only dropped the very end of the (low) band by 2 dbu but had started to pick up by 1200Khz. I won't know  how well it performs until tonight when the high end of the band opens.  For now it is performing aprox 13dbu better than the stock PL-310.

Gary has reported that his coil shows a better improvement when fitted to the 380 than the 310. Probably this coil would perform better in the PL-380 than the G8. I will try that later. I am also going to rewind the first coil but use 0.5mm spacing.

Roy.

 


Re: update on KEVT

Carl DeWhitt
 

oops! Excuse my boo boo !I did not notice the 2007 date before i posted this.

--- In ultralightdx@..., "carl_elissa" <carl_elissa@...> wrote:

This is from dxtests.info. It differs from what i read in that e mail .But i intend to check the frequency Thursday morning anyway.
Carl DeWhitt
Maryville,Tn.

KEVT 1210 kHz Sahuarita (Tucson), Arizona DX Test

Date: Monday morning (late Sunday night), Dec. 17, 2007.
Time: Midnight - 3:00 a.m. Mountain Standard Time, 0700 - 1000 UTC.
Modes of Operation: 10,000 watts using non-directional antenna pattern.
Programming: Station will be running regular Spanish-language programming with frequent use of their "La Raza" slogan, and English IDs at top of the hour.

QSL Information: The Broadcast Test Committee will be handling all reception reports and verifications for this test. Both eQSL service and traditional paper QSLs will be offered. Recordings on disk in .mp3 or .wav format, audio files via e-mail or cassette recordings will be accepted as proof of reception. Send reception reports and recordings to:

IRCA/NRC Joint BTC,
Attn: KEVT DX Test,
P.O. Box 3777,
Memphis, TN 38173-0777 USA.

E-mail reports and audio files may be sent to: KH2AR[at]comcast.net.

NOTE: All requests for paper verifications must be accompanied by return postage in order to receive a reply.


Re: TECH: PL310 stock loopstick tested

Gary DeBock
 

Hi Steve,
 
Thanks very much for investigating the PL-310 stock loopstick Q readings, and it's great to have you back in ULR tinkering. Those are very interesting results on the LW frequencies, and may help to explain why the PL-310's LW performance is so much better than that of the PL-380.
 
I have ordered some type 33 Amidon 7.5" ferrite bars and 165/46 Litz wire for some experiments to create an LW-optimized 7.5" loopstick PL-380, and will be interested to find out the optimum coil inductance for maximum LW sensitivity. I'll probably need to construct a longer Slider coil than the 81-turn model used for the peak AM sensitivity tests, to allow shifting the coil inductance up past 1000 uh (judging from your PL-300WT optimum LW inductance tests).
 
The SWP 7.5" Slider models that you helped create (by designing the CFJ455K5 filter mod) have been outstanding DXpedition performers throughout the past year, but they may finally have some serious competition from the new 7.5" Amidon PL-380's (Kevin's term :-)
 
Welcome back, and have fun.
 
73, Gary
 
  
 

In a message dated 1/13/2010 7:08:37 P.M. Pacific Standard Time, steveratz@... writes:
 

I removed the Tecsun PL310 stock loopstick today and checked it on the
HP4342A Q meter. Since this model ULR is about the only one that will
receive anything on LF (my closest LF NDB is 20 miles away, on 296 kHz), I
was curious how the loopstick measured. Bottom line is this loopstick works
has very low Q at MW above about 1000 kHz and is optimized more for LF
reception!
I will have to check the loopstick in my PL380 next and see if it's similar,
though that model doesn't hear anything on LF even though the loopsticks
look the same visually.

The PL310 loopstick measured 322 uH at 796 kHz, with a Q of 86. (The Q meter
uses certain fixed frequencies on various ranges when measuring inductance;
a range is chosen to peak the Q for a given inductance being tested, then
the inductance is read off the dial.)

1500 kHz Q 20 (that's the highest frequency I could check Q at since the Q
meter's variable cap was at its minimum setting)
1300 kHz Q 31
900 kHz Q 71
700 kHz Q 106
530 kHz Q 160
500 kHz Q 172
400 kHz Q 203
300 kHz Q 228
200 kHz Q 229

73,
Steve


Re: update on KEVT

Carl DeWhitt
 

dxtests.info is still listing a possible test from KEVT at 0030 PST this Thursday with 10 kW non-directional.No e mail answer yet from Sr.Zamora,CEO.
Carl

--- In ultralightdx@..., "carl_elissa" <carl_elissa@...> wrote:

This is from dxtests.info. It differs from what i read in that e mail .But i intend to check the frequency Thursday morning anyway.
Carl DeWhitt
Maryville,Tn.

KEVT 1210 kHz Sahuarita (Tucson), Arizona DX Test

Date: Monday morning (late Sunday night), Dec. 17, 2007.
Time: Midnight - 3:00 a.m. Mountain Standard Time, 0700 - 1000 UTC.
Modes of Operation: 10,000 watts using non-directional antenna pattern.
Programming: Station will be running regular Spanish-language programming with frequent use of their "La Raza" slogan, and English IDs at top of the hour.

QSL Information: The Broadcast Test Committee will be handling all reception reports and verifications for this test. Both eQSL service and traditional paper QSLs will be offered. Recordings on disk in .mp3 or .wav format, audio files via e-mail or cassette recordings will be accepted as proof of reception. Send reception reports and recordings to:

IRCA/NRC Joint BTC,
Attn: KEVT DX Test,
P.O. Box 3777,
Memphis, TN 38173-0777 USA.

E-mail reports and audio files may be sent to: KH2AR[at]comcast.net.

NOTE: All requests for paper verifications must be accompanied by return postage in order to receive a reply.


update on KEVT

Carl DeWhitt
 

This is from dxtests.info. It differs from what i read in that e mail .But i intend to check the frequency Thursday morning anyway.
Carl DeWhitt
Maryville,Tn.

KEVT 1210 kHz Sahuarita (Tucson), Arizona DX Test

Date: Monday morning (late Sunday night), Dec. 17, 2007.
Time: Midnight - 3:00 a.m. Mountain Standard Time, 0700 - 1000 UTC.
Modes of Operation: 10,000 watts using non-directional antenna pattern.
Programming: Station will be running regular Spanish-language programming with frequent use of their "La Raza" slogan, and English IDs at top of the hour.

QSL Information: The Broadcast Test Committee will be handling all reception reports and verifications for this test. Both eQSL service and traditional paper QSLs will be offered. Recordings on disk in .mp3 or .wav format, audio files via e-mail or cassette recordings will be accepted as proof of reception. Send reception reports and recordings to:

IRCA/NRC Joint BTC,
Attn: KEVT DX Test,
P.O. Box 3777,
Memphis, TN 38173-0777 USA.

E-mail reports and audio files may be sent to: KH2AR[at]comcast.net.

NOTE: All requests for paper verifications must be accompanied by return postage in order to receive a reply.


Re: Early results of 7.5" Amidion rod

Gary DeBock
 

Hello Roy and Neil,
 
Thanks for your comments on our group, Neil.
 
Roy, in my previous post there was a description of the method that Steve Ratzlaff and I used to optimize AM reception in the Tecsun PL-300WT and G8 models, and to determine the optimum loopstick coil inductance for peak AM sensitivity in the stock models (and in the 7.5" Amidon loopstick transplant models). That procedure is actually described in a file posted in our Ultralightdx site (under modifications), and is also directly linked at http://www.mediafire.com/?jyjg5hmkyqm .
 
Once we determined the optimum loopstick coil inductance for peak AM sensitivity in the models, we simply wound a fixed 40/44 Litz wire coil of the same inductance on the 7.5" Amidon ferrite bar, and obtained great results every time. Although their AM sensitivity was equal to the best of the modified Ultralights, unfortunately the fixed 3 kHz DSP selectivity in the 7.5" loopstick PL-300WT/ G8 models made them uncompetitive in transoceanic DXing when compared to the CFJ455K5 filter-modified E100 Slider and SWP Slider 7.5" loopstick models, so we didn't make too many of the modified PL-300WT/ G8 models last spring.
 
73 and Good DX, Gary
 
 
 
                                                                
 

In a message dated 1/13/2010 5:51:24 P.M. Pacific Standard Time, neil.findlay52@... writes:
 

Hi all
And a question to Roy
 
Currently using a 310 and a 380 with my Palstar R30a with 3 Kaz antennae as my spotter reciever
 
Just got my order of 40/44 litz wire, not yet got the Amidon rods. I do have a flat rod of unknown
ferrite type ( probably bought from local electronics supplier years ago ) it is 7&7/8 inch long by
3/4inch by 3/16 inch - The comment seem to indicate that flat is not ideal but at that size would it
be worth a try. I am off work / working from home at around 40% for two weeks after a minor
operation so will have some time and the Amidon rods wont arrive in that time. 
 
Roy
I am interested in what ypu have been able to hear from the East and North East also have you
ever heard a Western Australian station. I live at Rothwell ( on the edge of Deception Bay) just
going off the Redcliffe Peninsular. I have heard Fiji and many New Zealanders. I can hear a lot
of asians but not good at recognising the languages. My son knows some japanese and can rcognise
so will try for some of the powerhouses that Gary hears ie 747 etc. I have never heard a West Aust
yet. My other project is to get the Vactrol connected to the 3 Kaz antenna and wind a coupling on to
the 380 - I have some wire wrap from years ago computer projects.
 
This is the best group that I have part of in Medium Wave - a most co-operative group covering
listening and technical even part of the design team of our prime chip. Thank you for everyones effort
and for making the information available
 
Neil    


From: Roy com>
To: ultralightdx@yahoogroups.com
Sent: Thu, 14 January, 2010 10:50:38 AM
Subject: [ultralightdx] Early results of 7.5" Amidion rod

 

Hi All

The first coil was wound on the 7.5 inch rod with 165/46 spaced using 0.7mm solder as the spacer which is about the same size as the Litz, wound over 110mm centred on the rod. The capacitance reported by the G8 showed it had bottomed out at 1710Khz. I removed 2mm from each end and the capacitance showed 18 Pf at 1710Khz (7pf is the lowest). This resulted in aprox 15dbu increase on the G8 when compared to a stock PL-310 set a 3Khz bandwidth, holding this to the end of the band.

I was able to hear a station in another state on 1323Mhz (Cruise AM in Adelaide) last night that I have tried on and off and have never been able to receive at a distance of over 1600 KM (great circle) while listening with the radio on my bed side table.

I then decided to emulate Gary's 81 turn 40/44 coil starting at 43mm. The G8 reported it was bottoming out of capacitance at 1540Khz. I ran my standard tests and found this configuration was performing the same as the 165/46 coil at the bottom of the band but was dropping off by around 1200Khz (2-3 dbu).

I had to unwind 18 turns to get the G8 to report a value of 12pf at 1710Khz. This only dropped the very end of the (low) band by 2 dbu but had started to pick up by 1200Khz. I won't know  how well it performs until tonight when the high end of the band opens.  For now it is performing aprox 13dbu better than the stock PL-310.

Gary has reported that his coil shows a better improvement when fitted to the 380 than the 310. Probably this coil would perform better in the PL-380 than the G8. I will try that later. I am also going to rewind the first coil but use 0.5mm spacing.

Roy.

 



See what's on at the movies in your area. Find out now.


Re: possible dx test

Carl DeWhitt
 

I just sent a query to Sr.Armando Zamora,CEO, about the test.I am awaiting his reply.
Carl

--- In ultralightdx@..., "carl_elissa" <carl_elissa@...> wrote:

I just heard their slogan on the online stream."La Raza Doce Diez"(1210).I listening to the online stream now in hopes of hearing the legal i.d. on the hour.
Carl

--- In ultralightdx@..., "carl_elissa" <carl_elissa@> wrote:

Here is KEVT website and the CEO's name and e mail address.They do have live web audio also.

http://www.laraza1210.com/esp/


Armando Zamora
President / CEO
azamora@
The CEO maybe the one to send QSL requests to according to a report i saw elsewhere online.

Carl DeWhitt
Maryville,Tn.
--- In ultralightdx@..., "carl_elissa" <carl_elissa@> wrote:

This was posted on the IRCA mail list.I am forwarding it along for those who may want to try for it.If i can wake up for this or stay awake for it,it would be a great ulr catch here.
Carl DeWhitt
Maryville,Tn.


Message: 8
Date: Tue, 12 Jan 2010 20:49:48 -0800
From: mwdxer@ (Patrick Martin)
To: irca@
Subject: Re: [IRCA] 1210 test
Message-ID: <11312-4B4D50EC-814@>
Content-Type: Text/Plain; Charset=ISO-8859-1

Looks like KEVT-1210 will be testing early on Thursday morning with 10
kw non-directional starting at about 12:30 a.m.? Pacific time or 1:30
a.m. Mountain Time.? Programming is mostly Mexican Music but there
could be some English IDs.??? You might pass this on to anyone who
might be interested

Paul Losoff
Tucson AZ

* I don't know anymore about this, as Pul just sent the e mail.

Patrick Martin
KGED QSL Manager
From Carl:
Wikipedia has the following KEVT information:

KEVT Sahuarita, Arizona 1210 Slogan La Raza 1210 AM 10k/1k
format:Regional Mexican