Date   

Re: Tecsun PL-380 "Soft Mute" (or lack thereof)

Jim Shaw <jshaw1@...>
 


Gary,
 
Definitely agree.  I'm sure she's not a techie.
 
73
Jim

----- Original Message -----
Sent: Wednesday, January 06, 2010 12:44 AM
Subject: Re: [ultralightdx] Re: Tecsun PL-380 "Soft Mute" (or lack thereof)

 

Hi Jim,
 
Thanks for the reminder, and of course your original message that Joyce had mentioned a "new version" of the PL-380 alerted us that Tecsun had made a change in the model-- and we appreciate your notice.
 
Since Joyce's description of the upgrade wasn't too clear, however, it's probably best that we get an actual "new version" PL-380 and run some actual tests on it, to determine exactly what Tecsun has changed. If Tecsun intends to bring back the full "soft mute" function, our group would probably like to know right away, before more DXers order PL-380's.
 
73 and Thanks, Gary 
 
In a message dated 1/5/2010 8:10:15 P.M. Pacific Standard Time, jshaw1@....com writes:
 

Mike/Gary,

I asked Ms. Joyce that question and her comment was that the upgrade was to make the "receiving status stabler." See msg 7132. Thanx!

73
Jim Shaw
AL7BA

--- In ultralightdx@yahoogroups.com, D1028Gary@... wrote:
>
> Hi Mike,
>
> Thanks for your comments, which sound logical to me.
>
> Since Joyce is probably not an expert in Tecsun radio design, however, the
> best option seems to be specifically placing an order with Joyce for a "new
> design" PL-380, then checking the DSP filter options on this new version,
> and stripping it down (as Roy suggests) to check the labeling on the DSP
> chip. This "new version" PL-380 order will be placed tonight, with the EMS
> shipping option.
>
> 73 and Thanks, Gary
>
>
> In a message dated 1/5/2010 6:28:59 P.M. Pacific Standard Time,
> mikecoughlin2@... writes:
>
>
>
>
> > I don't know if these are the official "new model" PL-380's (mentioned
> by Joyce of Anon-co), or not. Nothing seems different to me. <
>
> Since Joyce is the one who mentioned this 'version 2', why not "go
> straight to the horse's mouth" and, simply, ask her what the difference is? ...
> rather than all these attempts to infer what the difference(s) is(are) ...
> via empirical observation?
>


Re: Tecsun PL-380 "Soft Mute" (or lack thereof)

thenoviciate <mikecoughlin2@...>
 

> Since Joyce is probably not an expert in Tecsun radio design, <

oh ... I was thinking that maybe Joyce had enough stroke with Tecsun (due to sales volume) that she might be in a position to simply ask Tecsun what the PL-380 v2 scoop is ... ?


First TP DX heard on my new PL-380 barefoot in Calgary AB

Deane McIntyre <Deane@...>
 

*This message was transferred with a trial version of CommuniGate(tm) Pro*

This morning I tried for TP DX for the first time on my new PL-380
that arrived just before Christmas. At 14:40 (one hour before lacal
sunrise here in Calgary AB) I tuned to 747 barefoot and there was
my old friend JOIB! Armchair copy at times. JOAK-594 was also heard at times.
As usual I listened in the 2 kHz bandwith position.

Also have a very strong 1 kHz het against 620 from a presumed
station on 621 but no audio - I wonder what station that might had been?

73,

Deane McIntyre VE6BPO
Calgary AB


Re: 1450 Help Needed

jim_kr1s <jkearman@...>
 

--- In ultralightdx@..., "Kirk" <kirk74601@...> wrote:

I just finished listening to a ESPN sta on 1450. It faded up to a nice
lvl a bit after 0800 UTC w/ a clear ID of "ESPN Radio WMAJ." Okay,
here's where it gets confusing. WMAJ is the former call sign for the
station WQWK in State College, PA.

"WQWK (AM) - a radio station (1450 AM) licensed to State College,
Pennsylvania, United States, which formerly held the call sign WMAJ"

http://en.wikipedia.org/wiki/WMAJ

"WQWK (1450 AM) is a sports radio station broadcasting in State College,
Pennsylvania. It is currently branded under the ESPN Radio."

http://en.wikipedia.org/wiki/WQWK_(AM)

That is outstanding, considering the mess on 1450! I have one here in
town (ESPN!), WSTU, so I don't listen to that frequency. There are 6
stations on 1450 in Pennsylvania, and 8 in Texas! Good catch, Kirk!

73,

Jim, KR1S


Kaito WRX-911 $14.95 at J&R

John A. Figliozzi
 

When perusing yesterday's New York Times, I saw the ad for J&R Music World and this rather popular item with some here was being offered on sale for this price. Just thought some might want to know.

John Figliozzi


MI LOG

wa8lcz
 

820 WWBA FL Largo Jan 5 1709 EST 50k 1k newstalk NEW 1000 mi

Byron nr Detroit Mi Sony SRF-59 barefoot


Re: more on PL-380 loop antennas

jim_kr1s <jkearman@...>
 

--- In ultralightdx@..., "nhpdxr" <nhp@...> wrote:

Haven't yet tried to track down whether there is a series capacitor between the SiLabs chip varactor pin and the loop antenna, but there is one in the SiLabs suggested circuit. If that is too low a value, presumably the capacitance created by the varactor and the capacitor in series with it will require a larger resonating inductance than recommended in the SiLabs spec sheet. However, my understanding is that the varactor's value should be automatically adjusted to compensate for the series capacitor, at least up to a point...
A series cap will reduce the available tuning range with the on-chip varactor, too. When you connect two capacitors in series, the total capacitance is less than the smaller of the two. Because the series capacitor has a constant value, the higher capacitance of the varactor, used to tune the low end of the band, is modified by a higher percentage than the minimum capacitance used to tune the high end of the band. That could explain why even your large inductor couldn't be resonated at the low end. If the series capacitor is small enough, the varactors won't have enough range to tune the inductor across the band.

Somewhere on that board is a tiny chip cap. Intuition says it ought to be 0.1 uF or greater. Wonder what they actually used? It might be possible to bridge it with a leaded cap; 0.1-uF ceramic caps are tiny. But a high-Q chip cap of the correct value is only about $1.50, though they are hard to handle, being very small.

73,

Jim, KR1S


Re: Garmin GPS / PL-380 battery charging

jim_kr1s <jkearman@...>
 

A follow-up. Gil, NN4CW, suggested the Blackberry 8330 battery charger for the Tecsun PL-380. I ordered one but the vendor shipped the wrong model. They shipped the correct one right away and didn't ask for the wrong one back, and I got it yesterday. It does indeed plug in and charge the radio, but it generates a LOT of RFI (radio-frequency interference). The noise only shows up when the charger is plugged into the radio. Switching supplies don't get serious until you give them a load. Wrapping the charger-radio cord around and through various ferrites didn't help enough to be worthwhile on MW, SW and many FM stations, so use this gadget for charging and disconnect it for listening. The Garmin GPS USB cable, OTOH, only introduces a little noise on MW, but my desktop PC is pretty noisy to start with.

I got an OEM Blackberry charger, their part number ASY-12709-001, or model number PSM04A-050RIMC . If you use your search engine to look for both numbers it will return a variety of outfits that sell them, all over the world. This charger is specified for 100-240 Vac input, 50-60 Hz, 5-Vdc output at 0.7 A.

Radios with clocks and alarms are continuously drawing power from the batteries. Having a charger that isn't dependent on the PC is handy. I got mine from an eBay seller, skymaster28, whose price was better than any I could find from an online retailer.

73,

Jim, KR1S


Re: First TP DX heard on my new PL-380 barefoot in Calgary AB

Gary DeBock
 

Hello Deane,
 
Congratulations on your new barefoot PL-380 receptions of 747-JOIB and 594-JOAK in Calgary, which are excellent catches during this month (which is not known for good TP propagation).
 
As for your 621 heterodyne, the most common suspects would be the 500 kw North Korean station in Chongjin, and a 200 kw Chinese station in Harbin. These two TP's were presumably fighting it out during a late September 621 kHz recording on the modified C.Crane SWP and 36" bedside PVC Loop here in WA state.  http://www.mediafire.com/?ngfn5jcknt2  The 621 kHz stations are definitely not "big gun" TP's, but occasionally Alberta DXers like Nigel have the TP propagation edge on us here on the west coast, so anything is possible.
 
73 and Good DX,
Gary DeBock (in Puyallup, WA)
 
In a message dated 1/6/2010 8:24:18 A.M. Pacific Standard Time, Deane@... writes:

 

*This message was transferred with a trial version of CommuniGate(tm) Pro*

This morning I tried for TP DX for the first time on my new PL-380
that arrived just before Christmas. At 14:40 (one hour before lacal
sunrise here in Calgary AB) I tuned to 747 barefoot and there was
my old friend JOIB! Armchair copy at times. JOAK-594 was also heard
at times.
As usual I listened in the 2 kHz bandwith position.

Also have a very strong 1 kHz het against 620 from a presumed
station on 621 but no audio - I wonder what station that might had been?

73,

Deane McIntyre VE6BPO
Calgary AB


1260 Correction

Kirk <kirk74601@...>
 

Oops!

XEOG, Ojinaga, CH, 0105 UTC, 12/6/10
DATE SHOULD BE 1/6/10.
Sorry, I only missed it by a month:)


New Logging

Kirk <kirk74601@...>
 

After monitoring 1260 for a total of 4 hours, I finally nailed an ID on a XE sta I thought I hadn't ever heard which proved to be true. Logged on SRF-59 w/ SAT.

1260, XEOG, Ojinaga, CH, 0105 UTC, 12/6/10, Weak sig but sometimes faded up to a decent understandable (by a native speaker) lvl. Seems to be mostly all tlk. Very messy freq but I hrd lierally dozens of Chihuahua mentions. Finally caught "Radio Ranchito" IDs tonight @ 0055 UTC and 0105 UTC. Didn't copy any call letters.

73!!

Kirk Allen
Pasadena, TX


1450 Help Needed

Kirk <kirk74601@...>
 

I just finished listening to a ESPN sta on 1450. It faded up to a nice lvl a bit after 0800 UTC w/ a clear ID of "ESPN Radio WMAJ." Okay, here's where it gets confusing. WMAJ is the former call sign for the station WQWK in State College, PA. WMAJ is also the call letters of possibly their sister station on 99.5 FM who are supposed to have an adult contemporary format. Does anyone know what's going on with those two stations? Maybe WMAJ is airing ESPN pgms @ night and WQWK is simulcasting?? If not, then I'm hearing something from the past, ha ha. Any help would sure be appreciated! Thank you.

Kirk Allen
Pasadena, TX


more on PL-380 loop antennas

Nick Hall-Patch
 

Well, I hauled out a small slug adjustable ferrite "loopstick" from my junk box, and tried using it as the loop antenna for the PL380, hanging outboard in a similar location to Gary DeBock's 7.5" loop antenna.

I tuned it to 1600 kHz and adjusted the slug for maximum signal strength on the Blaine station. My gosh, the coil measured 600uH at a Q of 60 at 100kHz. (pretty close to Gary's 554uH requirement on the 7.5" loop)...I measured signal strengths on 550, 730, and 980 kHz stations as well. Then I tuned to 550kHz, and readjusted the slug for maximum signal there; I pretty much ran out of slug adjustment....970uH at Q=92.5, but lost 15dB or so on the 1600kHz station by doing this. I also did a test at 211uH, Q=23 for comparison, given that 211uH should be within the Silicon Labs chip's best inductance range, and suffered a 4 to 8dB loss on various stations from that observed when the coil had been peaked for 1600kHz at 600uH.

frequency 970uH 600uH 211uH
550 44dBu 42 dBu 34 dBu
730 50dBu 50 dBu 44 dBu
980 47 dBu 48 dBu 44 dBu
1600 37 dBu 52 dBu 47 dBu

I'm beginning to think there is more to the PL-380 than just the stock SiLabs design??? 600uH seems to be a good compromise, but is definitely outside the chip's suggested inductance range, and it still isn't quite enough to entirely peak the lower end of the band, though we're only talking a couple of dB.

Haven't yet tried to track down whether there is a series capacitor between the SiLabs chip varactor pin and the loop antenna, but there is one in the SiLabs suggested circuit. If that is too low a value, presumably the capacitance created by the varactor and the capacitor in series with it will require a larger resonating inductance than recommended in the SiLabs spec sheet. However, my understanding is that the varactor's value should be automatically adjusted to compensate for the series capacitor, at least up to a point...

Definitely food for thought.

best wishes,

Nick


Tecsun PL-330

Roy <roy.dyball@...>
 

Hi all

Don�ft know if this one has been posted before. Here is a picture of the Pl-330, I don�ft have any details. Vertical format looks good.

Roy.


Re: Tecsun PL-380 "Soft Mute" (or lack thereof)

kbar123456 <kbar123456@...>
 

What I read in the tecsun's forum is that the new version got the alarm clock bug fixed only.

But anon-co may know more details of it.

--- In ultralightdx@..., "Jim" <jshaw1@...> wrote:

Mike/Gary,

I asked Ms. Joyce that question and her comment was that the upgrade was to make the "receiving status stabler." See msg 7132. Thanx!

73
Jim Shaw
AL7BA

--- In ultralightdx@..., D1028Gary@ wrote:

Hi Mike,

Thanks for your comments, which sound logical to me.

Since Joyce is probably not an expert in Tecsun radio design, however, the
best option seems to be specifically placing an order with Joyce for a "new
design" PL-380, then checking the DSP filter options on this new version,
and stripping it down (as Roy suggests) to check the labeling on the DSP
chip. This "new version" PL-380 order will be placed tonight, with the EMS
shipping option.

73 and Thanks, Gary


In a message dated 1/5/2010 6:28:59 P.M. Pacific Standard Time,
mikecoughlin2@ writes:




I don't know if these are the official "new model" PL-380's (mentioned
by Joyce of Anon-co), or not. Nothing seems different to me. <

Since Joyce is the one who mentioned this 'version 2', why not "go
straight to the horse's mouth" and, simply, ask her what the difference is? ...
rather than all these attempts to infer what the difference(s) is(are) ...
via empirical observation?


Re: Tecsun PL-380 "Soft Mute" (or lack thereof)

Jim <jshaw1@...>
 

Mike/Gary,

I asked Ms. Joyce that question and her comment was that the upgrade was to make the "receiving status stabler." See msg 7132. Thanx!

73
Jim Shaw
AL7BA

--- In ultralightdx@..., D1028Gary@... wrote:

Hi Mike,

Thanks for your comments, which sound logical to me.

Since Joyce is probably not an expert in Tecsun radio design, however, the
best option seems to be specifically placing an order with Joyce for a "new
design" PL-380, then checking the DSP filter options on this new version,
and stripping it down (as Roy suggests) to check the labeling on the DSP
chip. This "new version" PL-380 order will be placed tonight, with the EMS
shipping option.

73 and Thanks, Gary


In a message dated 1/5/2010 6:28:59 P.M. Pacific Standard Time,
mikecoughlin2@... writes:




I don't know if these are the official "new model" PL-380's (mentioned
by Joyce of Anon-co), or not. Nothing seems different to me. <

Since Joyce is the one who mentioned this 'version 2', why not "go
straight to the horse's mouth" and, simply, ask her what the difference is? ...
rather than all these attempts to infer what the difference(s) is(are) ...
via empirical observation?


Re: Tecsun PL-380 "Soft Mute" (or lack thereof)

thenoviciate <mikecoughlin2@...>
 

I don't know if these are the official "new model" PL-380's (mentioned by Joyce of Anon-co), or not. Nothing seems different to me. <
Since Joyce is the one who mentioned this 'version 2', why not "go straight to the horse's mouth" and, simply, ask her what the difference is? ... rather than all these attempts to infer what the difference(s) is(are) ... via empirical observation?


Re: ULR DX......One NEW Station @ SUNSET...Plus a UNID ESPN on 700 Khz....Need h

jim_kr1s <jkearman@...>
 

--- In ultralightdx@..., "Robert S.Ross VA3SW" <va3sw@...> wrote:

Well...that was what I was suspecting....but I thought I had heard these
guys were Brazilian Format/Portuguese language programming????

Guess they are back to ESPN??

73...ROB VA3SW
KR1S... Fair & Balanced. I report, you decide. :)

73,

Jim, KR1S


Re: G8 vs CR-1100 preliminary AM BCB report-FARMERIK

Rik
 

Gary - Thanks for offering to mail the manual, but Kaito did email me a link, and I downloaded and printed it off. As you said, I did not find instructions on how to change from 9 to 10 Kc.steps. The performance is quite a bit better than the G8 on domestic AM BCB, and so is the audio, so it should be a pretty good port-a-table sort of radio. The only AM splatter on domestic frequencies is AM 740, a powerhouse from Toronto which does seem to have a wider audio bandwidth than any other station on the dial here.
I have not had a chance to try it out in the daytime either, but I have not forgotten about it. - FARMERIK

--- In ultralightdx@..., D1028Gary@... wrote:

Hello Farmerik,

Thanks for your message.

The CR1100 units were obviously designed for the Chinese domestic market
and can be set to tune in 9 kHz steps, but the neither the poorly-written
English manual nor the Chinese manual mentions how to do this. The Chinese
manual says that the steps tune in 9 kHz increments, and the English manual
say that the steps tune in 10 kHz increments. Lots of help, right?

But even if the CR1100 model here could be set to tune in 9 kHz steps, this
would hardly transform the radio into a prolific TP-chaser. The Si4734 DSP
filtering is fixed at such a wide setting (my guess is 4 kHz) that
domestic splatter would almost always cover any TP's that show up. Because the
radio will not tune in 1 kHz steps, there is no way to get 1 kHz farther away
from splatter (like with the PL-380).

If you still don't have an English manual for your CR1100, I would be happy
to mail you mine for free (if you can give me your snail mail address).
Both my wife (from Hong Kong) and I can read Chinese, so the more detailed
Chinese manual is the one we would use. Unless someone else wishes me to scan
and post the English manual, I'd be happy to mail it to you.

73, Gary


In a message dated 1/2/2010 9:50:05 P.M. Pacific Standard Time,
farmerik@... writes:




If the 9 Kc. steps were selected, would it be on frequency for the trans
ocean signals?

I am disappointed the loop stick is not larger.

I did not get the English manual included. I emailed Amazon, and they said
contact the MFG. Since the controls are in Chinese, I thought perhaps
Kaito wrote the manual, so I emailed them. No answer, but it's a Holiday week
end here. You don't have the CR-1100 English manual scanned do you? -
FARMERIK

--- In _ultralightdx@ultralightdxult_ (mailto:ultralightdx@...)
, D1028Gary@, D1

Hello Farmerik,

All of the radios you mentioned (G8, PL-380, CR-1110 and PL-600) are on
hand here, in this overcrowded shack.

The CR-1110 is a rather odd bird that has far better AM sensitivity on
the
high frequencies (especially the X band) than on the middle and low
band.
It was tested extensively against an aligned Sony ICF-S5W on all
frequencies
from 530-1700 kHz, and was found inferior in sensitivity to that classic
model on most AM frequencies, but clearly superior on the X band. It
also
did not suffer from the ICF-S5W's severe image reception issue, of
course.

I did a mini-review of the CR-1100 back in June, which may be of
interest
to you. Some of the information is dated (such as the praise of the
PL-300WT, the only DSP model available at the time), but the rest should
give you
detailed impressions on the model. Hope you enjoy it!

73 and Have Fun, Gary



Hello All,



Very impressed with the performance of the new Tecsun PL-300WT
DSP-enhanced

Ultralight radio on medium-wave, it was a natural decision to place an

order with Amazon.com for the new full-sized Tecsun CR-1100 AM-FM
portable,

which uses the same innovative Si430/31 DSP chip from Silicon Labs.
Today
my

new CR-1100 portable arrived from Kaito Electronics after a 4-day delay,

and payment of $69.99 plus $13.00 shipping (by USPS Priority Mail).



The CR-1100 is strictly a Chinese-market portable, to the extent that
all

of the controls are labeled only in Chinese. Despite this, Kaito has

provided a very basic (and poorly translated) English manual, as well as
the

standard and far more thorough Chinese manual. The AM frequency steps
have
also

been reprogrammed to 10 kHz, matching the North American market.



Immediately after arrival, the radio's out-of-the-box AM performance was

tested against a fully aligned Sony ICF-S5W portable (which has had the

frequency coverage extended to 1700 kHz). The comparison of these two
radios

proved to be very interesting, and showed that while the CR-1100 has
some

good DXing potential on AM, it also has some puzzling shortcomings.



In comparison to the PL-300WT's sharp DSP-enhanced selectivity, the
CR-1100

had a tough time going up against the ICF-S5W, with its common 455 kHz

Murata filter. Local slop on the CR-1100 was more troublesome than on
the

PL-300WT, making it seem like Tecsun programmed the DSP chip to provide
a

wider selectivity setting on this music-oriented receiver. The ICF-S5W
was
able

to weakly receive KPQ-560 in the null of semi-local KVI-570 in the early

afternoon, while the CR-1100 could only produce KVI splatter. Low-band

sensitivity on the CR-1100 was very good, but not quite up to the
class-leading

ICF-S5W standard. Although the CR-1100's low-band sensitivity will match

that of the PL-300WT, unlike the PL-300WT, the CR-1100 cannot tune in 1
kHz

steps, making it impossible to chase TP's on the 9 kHz splits.



The CR-1100 versus ICF-S5W contest became much more competitive on the
high

band, however, and on the X-band the new Tecsun was clearly far more

sensitive than the classic Sony portable. In fact, the CR-1100 sets a
new

standard for X-band sensitivity among portables, having weak signal
performance

never experienced in extensive testing here. Weak fringe stations that
were


barely audible on the ICF-S5W had solid audio on the Tecsun.



Also notable in the CR-1100 was the complete freedom from image
reception

of local stations, a major shortcoming of the classic ICF-S5W. The
Sony's

image reception detracts greatly from its otherwise stellar performance,
but

the Tecsun DSP chip appears to have solved the problem entirely.



After the out-of-the-box performance test, the CR-1100 was disassembled
to

check the loopstick construction, and the possibility of alignment. Both

the PL-300WT and CR-1100 were designed to have a "no alignment" RF
system,
in

which the DSP chip ensures maximum performance without loopstick
peaking,

or adjustment of a 1400 kHz trimmer. In the CR-1100, there is a 4.25" x

.36" single-coil loopstick in the middle of the cabinet, which seems
rather

odd because of the extensive cabinet space on both sides which would
allow


placement of a much longer ferrite bar, if desired. Alignment was
attempted


by shifting the coil, but this had no effect on the CR-1100's
sensitivity
on

any AM frequency. Apparently DXers will need to accept the CR-1100's

sensitivity as delivered, unless they wish to transplant a larger
ferrite
bar

with a coil of equal inductance (which is certainly possible with all
the

extra cabinet space).



The CR-1100 also has a sensitive FM section, although again, for some

unknown reason it seemed slightly less sensitive than that of the
PL-300WT.


Perhaps there is a greater impedance mismatch with the CR-1100's short
whip


antenna, but in any case the PL-300WT Ultralight can receive more weak
FM

fringe stations here than the CR-1100.



The CR-1100 has a large music-oriented speaker and excellent audio, with

analog tone and volume control knobs. The 8-ohm speaker has a 1-watt
rated

output. The radio also has 300 memories, and various digital tuning

capabilities. It operates on 4 "D" batteries, and comes in an attractive

black-brown cabinet. It is available from Amazon.com (via Kaito
Electronics) for

$69.99 plus $13.00 shipping.



So after the full evaluation, what would be the CR-1100 verdict for a

dedicated medium-wave DXer? If you are a domestic DXer that concentrates
on
the

upper frequencies (especially the X-Band), the new CR-1100 would be
tough

to beat. Its upper-band sensitivity (and generally good selectivity) is

likely to set a new standard for contemporary portables. Urban DXers
will

appreciate the complete freedom from image reception, and general
freedom
from

spurious products. Hobbyists who enjoy music reception will not be

disappointed in the CR-1100's audio qualities. However, if you wish to
chase

transoceanic DX, or wish to experience the maximum potential of the
exciting new

Silicon Labs DSP chip, my recommendation would be to pass on the
CR-1100--

and go for the new PL-300WT Ultralight model. Its 1 kHz tuning ability
and

stellar selectivity (plus superior FM sensitivity) make it the obvious

choice for most medium-wave DXers.



73 and Best Wishes,



Gary DeBock (in Puyallup, WA)








*

* _farmerik@ * _farmerik@<WBR>._ * _farmerik







OK, now I get it. Sort of like the audio version of the screen break-up
on
digital video. I can see why it would be a problem for really weak
signal
DXing, however on my G8 I don't think I will miss any station strong
enough
to actually listen to.
Both the G8 and CR-1100 hear weak stations with less noise and
interference than my analog radios, but miss all the really weak signals
entirely. The
CR-1100 is significantly more sensitive and has less noise on its weak
stations though. Anyone have a PL-380 AND a CR-1100 to compare? My new
PL-600
seems MUCH more sensitive than the CR-1100. - FARMERIK

--- In _ultralightdx@ --- In _ultralightdx@<WBR>ul_ultralig
htdx@ultralightdxult_ (mailto:ultralightdx@...) )
, Richard Berler <lrdheat@> wrote:

The soft mute occurs when tuned exactly on frequency on weak signals
that vary between s/n's of 0, and s/n's that rise above zero...instead
of a
smooth rise or fall in the audible signal, the signal sounds like it is
flickering. The set, if soft mute is the default mode (as it is on the
G8 and
PL-310), will semi mute the signal of a station that falls below (or
rises
above) a certain threshold of signal strength, resulting in the
flickering of
the audible signal.
Â
Heatwave

--- On Sat, 1/2/10, farmerik <farmerik@...> wrote:


From: farmerik <farmerik@...>
Subject: [ultralightdx] Re: G8 vs CR-1100 preliminary AM BCB
report-FARMERIK
To: _ultralightdx@ To: _ultralightdx@<W_ultralightdx@ultralightdxult_
(mailto:ultralightdx@...) )
Date: Saturday, January 2, 2010, 9:49 AM
>
Â




I used to use WICC as a test for a good radio in the daytime. It is
much
closer to Westport than I am in the Northeast of CT, while Westport and
Naugatuck [WICC] are in the Southwest part of the state. Since you used
to
live in the area, I'll mention some call letters next time.

Maybe I need some help understanding exactly what the dreaded soft
mute
sounds like. Is it only a problem when tuned one or two Kc. off? Or is
it
the mute which happens before you couple an external loop, and you have
to
change frequency, and come back after the loop is in place? Maybe
something
else entirely? - FARMERIK

--- In ultralightdx@ yahoogroups. com, Richard Berler <lrdheat@ >
wrote:

Thanks!
ÃÆ'‚Â
Also, check to see if there is a pumping on marginal-weak daytime
signals (the dreaded soft mute).
ÃÆ'‚Â
I used to live in Westport, CT. From there, I needed a good radio to
get WBZ and WPRO during the daytime, and to get WCAU, KYW, and
WFIL?(560)
from Philly.
ÃÆ'‚Â
Heatwave
> Streets of Laredo, TX!
ÃÆ'‚Â
--- On Fri, 1/1/10, farmerik <farmerik@ .> wrote:
> >
From: farmerik <farmerik@ .>
> Subject: [ultralightdx] Re: G8 vs CR-1100 preliminary AM BCB
report-FARMERIK
To: ultralightdx@ yahoogroups. com
> > Date: Friday, January 1, 2010, 7:21 PM
> >
ÃÆ'‚Â



I'll see what I can do. I usually don't listen in the daytime.-
FARMERIK

--- In ultralightdx@ yahoogroups. com, Richard Berler <lrdheat@ >
wrote:

Happy New Year!
ÃÆ'Æ'‚ÃÆ'‚Â
Can you do some mid-day testing, and post your observations?
> ÃÆ'Æ'‚ÃÆ'‚Â
Thanks!
ÃÆ'Æ'‚ÃÆ'‚Â
Heatwave

--- On Thu, 12/31/09, farmerik <farmerik@ .> wrote:


From: farmerik <farmerik@ .>
Subject: [ultralightdx] G8 vs CR-1100 preliminary AM BCB
report-FARMERIK
To: ultralightdx@ yahoogroups. com
Date: Thursday, December 31, 2009, 11:31 PM
> > >

ÃÆ'Æ'‚ÃÆ'‚Â

> > >
I've had the G8 for a couple months, since joining here, but just
got my CR-1100 today. Both have the same DSP chip I believe. The CR only
tunes in 10 Kc. steps on the AM BCB, but I believe it can be programed
for 9
Kc. steps too.[You can not 'slope tune' it off a Kc. or two to escape an
adjacent much stronger station.]

The CR-1100 is rated by Tecsun at 0.5mv/M with its larger ferrite
and the G8 is listed as 1mv/M. The CR-1100 is not really so much
different
than a modified DSP ULR with larger ferrite, but I don't think it
qualifies
for competition.

I placed the two radios side by side, facing the same direction,
running both on good alkaline batteries. I tuned three ten 'channel'
bands,
700-790, 1000-1090 and 1500-1590, and took notes on each station I
heard.
I'll summarize here. The CR is noticeably better on about 50% of the
frequencies, and about 1/3rd of those are substantial improvements. I
got stations
on all but 6 of the 30 frequencies on both radios, so it is a good night
here in Connecticut.
> > > As expected, the audio bandwidth on the CR sounds noticeably
wider,
but what I didn't expect is that when ever there is back round noise, or
a
second weak station is also heard, it is much quieter on the CR. I
expected
wider selectivity to hear more noise and other stations not less. The
narrower G8 bandwidth seems to hurt, NOT help with interference.

Also, I looked at the meters for dBa and s/n. Both numbers
scrolled
all the time on strong and weak stations. The CR had +5 to +10 more
units
on the dBu scale on average, and sometimes the differences were much
greater. The G8 ran +10 to +15 units on the s/n read out. I don't know
what to
make of that, but probably they are not 'calibrated' or 'standardized' ,
so it
does not mean a thing. If anyone can explain it, I'm all ears.

I tried the TERK with both radios, and as before with the G8, it
can
lower back round noise,but it does not seem to ever dig a weak station
out
of noise like it does on a cheap portable.
> > -FARMERIK
>




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.


Re: Tecsun PL-380 "Soft Mute" (or lack thereof)

Gary DeBock
 

Hi Jim,
 
Thanks for the reminder, and of course your original message that Joyce had mentioned a "new version" of the PL-380 alerted us that Tecsun had made a change in the model-- and we appreciate your notice.
 
Since Joyce's description of the upgrade wasn't too clear, however, it's probably best that we get an actual "new version" PL-380 and run some actual tests on it, to determine exactly what Tecsun has changed. If Tecsun intends to bring back the full "soft mute" function, our group would probably like to know right away, before more DXers order PL-380's.
 
73 and Thanks, Gary 
 
In a message dated 1/5/2010 8:10:15 P.M. Pacific Standard Time, jshaw1@... writes:

 

Mike/Gary,

I asked Ms. Joyce that question and her comment was that the upgrade was to make the "receiving status stabler." See msg 7132. Thanx!

73
Jim Shaw
AL7BA

--- In ultralightdx@yahoogroups.com, D1028Gary@... wrote:
>
> Hi Mike,
>
> Thanks for your comments, which sound logical to me.
>
> Since Joyce is probably not an expert in Tecsun radio design, however, the
> best option seems to be specifically placing an order with Joyce for a "new
> design" PL-380, then checking the DSP filter options on this new version,
> and stripping it down (as Roy suggests) to check the labeling on the DSP
> chip. This "new version" PL-380 order will be placed tonight, with the EMS
> shipping option.
>
> 73 and Thanks, Gary
>
>
> In a message dated 1/5/2010 6:28:59 P.M. Pacific Standard Time,
> mikecoughlin2@... writes:
>
>
>
>
> > I don't know if these are the official "new model" PL-380's (mentioned
> by Joyce of Anon-co), or not. Nothing seems different to me. <
>
> Since Joyce is the one who mentioned this 'version 2', why not "go
> straight to the horse's mouth" and, simply, ask her what the difference is? ...
> rather than all these attempts to infer what the difference(s) is(are) ...
> via empirical observation?
>