Date   

Re: PL-300WT/G8 Hets and Birdies - a theory

Paul Shaffer <dxrx@...>
 

Kevin:
One thing worth investigationg is the internal block-diagram of the DSP chip. The IF for the AM section would appear to be an on-board 32.768kHz oscillator. IMHO, I would rule that out as source. My recent investigations into the G6 model reveals poor shielding of the display circuits, that run on a different internal frequency. "IF" the FM IF is also low at about 150kHz, the addition of both IF's results in about a 182.768kHz frequency. I think a measurement of birdie frequencies is in order. For example my G6 has them spaced at near 190kHz intervals in the low end of the AM band, (notably on 580 and 770 kHz) but under certain conditions also manifests itself at higher multiples of 190kHz. As such, the display circuits can't be ruled out as cause for birdies, switch tones etc.

Paul S


ULR Station #600 This Morning

Kirk Allen <kirk74601@...>
 

Greetings,

Although it was tough copy all the way, 1360 came through for me this morning with the logging of ULR stations #599 and #600.

1360, KWWJ, Baytown, TX, 1148-1154, 6/26/09, Topaz lists this one as silent. I guarantee you that's not true. I was hearing two different Southern Gospel stations over and under each other, so it was confusing which one was doing what. Hrd some Pentecostal-styled preaching by I presume a black minister complete with a few lines of "speaking in tongues." ID's noted at 1148 and 1154, "Gospel 1360." This was // their streaming feature on the station's website.

1360, KBYO, Tallulah, LA, 1148-1216, 6/26/09, this was the other black gospel station I was hearing, but this one hung in there longer than KWWJ. Possible mention of "The Morning Show" although I'm not certain it was this station that announced that. Good ID's noted at 1149, 1157, 1158, 1205, and 1216. M ancr w/ nx at 1200. Sta #600

Tnx to John Bryant, I started playing around with a Sony SRF 59 last March and logged some stations through the next four months. The "ultralight bug" didn't really bite me until August of last year. I broke down and went to the unlimited class after I logged my 100th station.
So far from this same QTH I've lucked into 11 countries, 80 LAm stations, 38 US states, and 40 GY'ers. Now it's onward and upward toward the new goal of 700. I've had/am having a blast with the ULR DX'ing...more fun in radio than I've had since 1995. Thanks go out to everyone here that have taught me a lot about MW propagation, MW antennae, etc. which honestly I never undertook seriously until last year.
Good Listening Everyone!

Kirk Allen
Ponca City, OK
Eton E-100 Slider
Select-a-Tenna


Re: PL-300WT Tests On Going - Part One

dhsatyadhana <satya@...>
 

Thanks, John - I look forward to hearing about your findings!

On a similar note, I compared the filtering of the PL-300WT with the "Narrow" setting of the PL-450 last night, and surprisingly the two were very similar. I would definitely give the nod to the PL-300WT, but in many cases where I was DXing 10 khz from a strong local, the results were remarkably similar whether I was on-frequency or detuned a bit. So, as you have a chance to compare actual TP signals on the Murata Slider and the PL-300WT, it will be interesting to see what the difference is.

I also thought that the PL-450, when I first started using it, was a very capable FM performer, and it probably is. However, the filtering and sensitivity on the PL-300WT is far and away superior to the PL-450.

Kevin S
Bainbridge Island, WA

--- In ultralightdx@yahoogroups.com, "John H. Bryant" <bjohnorcas@...> wrote:

I was/am really excited when the 300WT arrived on the scene. Beside
the DXing possibilities offered by the DSP circuitry, the fact that
it offers running numerical values of signal strength and S over
Noise offered at least the possibility of running some semi-accurate
antenna comparisons... The 300WT might be the instrument that I
needed to do some development on multi-bar ferrite antennas, etc.

I ordered one and then an additional two PL-300WTs from the Hong Kong
source and have just had time to spend about half a day with all three.

Some notes:

The three were all produced in May 2009 (sticker inside) and their
unaligned stock performance was quite similar on weak signals. There
were differences... one was always slightly better, one was always in
the middle and one was always slightly poorer, but with these three,
the performance differences were very slight.

Foolishly, I did not keep one stock and peak the antenna bar on the
other two to see how much they improved. Intuitively, the
improvement was slight, if any. As Gary and others have found, each
of my units had the coil over at the left end.

Man. peaking these things is a whole new experience, after a lifetime
of peaking up analog circuits without a varactor at work in the
circuit simultaneously with the movement of the coil. These things
have no real resonant peak.... rather, it is a plateau, or seems so
to me. There is obviously a broad range of coil inductances that the
varactor will compensate for, so the set is out of resonance at some
point (for my three, that is with the coil partly off the bar) or it
is in resonance.... as I slide the bar toward the center, there is no
change in reception, despite me making major changes in inductance
(by the sliding of the coil.)

There is less plastic in the PL-300WT than in the E-100. The ferrite
bar is only supported in a tray under the right-hand half of the
bar. The rest of the bar is suspended.... cantilevered out in space.
This is probably why they are so enthusiastic in the use of glue in
holding the bare bar onto the little tray under the right-hand
half. I was able to get two of the three antenna bars out, intact,
after breaking the first one. I did not find any "secret" to
successful bar removal.... just patience and gentleness.

The varactor makes the antenna circuit so forgiving that I found that
I could use my standard Plywood Slider boards and the coils that were
designed to work with my E100s for the PL-300WTs. I hold the radios
to the boards with Velcro and have a set-screw arrangement in the
Litz wires between the radio and the Sliding coil, so swapping radios
and getting things up and running was very easy.

In the next day or two, I'm going to do another comparison of all
three 300WT radios.... this time with all of them set up as
Sliders. I'll then pick the two most similar to use in antenna tests
and return the third one to stock status for use in the Barefoot Class.

I did make one series of comparative tests last evening.... Between
one of the PL-300WTs as an 8" Slider and my favorite TP DX ULR, an
E100 8" Slider with the vaunted $50 Murata filter aboard. I checked
the performance of the two on about 8 or ten weak signals throughout
the domestic band, using my audio switching box that can switch my
headphones back and forth instantaneously or put one radio in each
ear. The test was a real revelation..... I'll be using the PL-300WT
as my DOMESTIC DX receiver for the foreseeable future. The reception
of these weak signals was at least slightly superior on the 300WT on
each and every test frequency!!! I'll not be doing much domestic DX
out here in the Pacific NW, but I was beginning to hit difficult
times in Oklahoma with 550 domestics, so a hot new receiver will be
most welcome when I return to the Southern Prairie. The difference
between the two radios was mostly in intelligibility... The very
narrow Murata filter tends to muffle audio unless off-tuned one kHz.
and you can't really do that on a very weak signal. However, beside
the boost in intelligibility, the 300WT did also seem a bit more
sensitive, over-all.

I'm going to run a comparison between an E100 Slider without a Murata
filter and a 300WT Slider to see if I can isolate/verify the gain in
weak signal sensitivity a bit more.

Right now, I'm not convinced that the 300WT is the superior radio for
all situations of TP DXing. It certainly has the HUGE advantage of
not having to have a very difficult-to-perform IF filter transplant
to be useful with off-channel TP or TA DXing.... and useful it will
be. However, there were instances last summer and fall where the
Murata-filtered E100 just performed miracles of working in close to
domestic channels. I'm thinking of 738 and 747 and even 1 kHz. splits
where one could get useable DX signals "backing in" to the DX side of
the pile. Comparing the two sets here by just off-tuning a domestic
by two or three kHz., I seem to hear slightly less domestic splatter
with the Murata. I'm not certain that is a totally relevant test. In
truth, there is only one way to tell which can work in close the most
successfully.... a trip to Grayland :>)

So far, I've not noticed any objectionable AGC action with my three
PL-300WTs, and given the amount of weak signal work that I did
yesterday, I think that I'd have noticed, were it a problem with
these particular sets.

Back to work! More later.


PL-300WT/G8 Hets and Birdies - a theory

dhsatyadhana <satya@...>
 

One thing I noticed last night is that the tone seems to zero-beat about 1 khz above the 10-khz carrier frequency of the station of interest. A theory I have is that the low-frequency IF of this receiver is producing an image twice the IF away from a strong local. The reason I say this is that a passive loop tuned to the frequency of interest will pretty much get rid of the het. I seem to recall that it had an IF similar to the Sony chip, perhaps 50-60 khz, so the image-producing station may not be far away.

I plan to do some more testing tonight (and maybe today if there are enough data points available) to see it I can pin down what is happening. I should be able to notch out the image-producing station, etc.

If it is an image problem, and is not found on all sets, it seems to point to an IF bleed-through issue, perhaps a stray glob of solder or excessively long wire that is acting as an antenna and "transmitting" the IF image on the board?

Kevin S
Bainbridge Island, WA

--- In ultralightdx@yahoogroups.com, "dhsatyadhana" <satya@...> wrote:

My PL-300WT also has hets on several frequencies, on perhaps 5-10% of the frequencies on the MW band. Many of the hets go away if I detune 2 khz either way, which I do anyway for tone and interference purposes.

So, perhaps my unit is also defective in that way. Since it came from China, it isn't worth the postage to return it and get a new one. Mine also has the momentary chirps described below, especially when tuning through/around strong locals.

Kevin S
Bainbridge Island, WA


I didn't notice any heterodynes 1 or 2 kHz away from stations, so
maybe your G8 does have a problem in this regard. There were very
slight digital tuning noises that occurred when shifting the
frequencies in 1 kHz steps, but these only lasted for a fraction
of a second. Maybe some of the other PL-300WT/G8 owners have some
reports of how their units operate, and whether they have similar
quirks. >


PL-300WT Tests On Going - Part One

John H. Bryant <bjohnorcas@...>
 

I was/am really excited when the 300WT arrived on the scene. Beside the DXing possibilities offered by the DSP circuitry, the fact that it offers running numerical values of signal strength and S over Noise offered at least the possibility of running some semi-accurate antenna comparisons... The 300WT might be the instrument that I needed to do some development on multi-bar ferrite antennas, etc.

I ordered one and then an additional two PL-300WTs from the Hong Kong source and have just had time to spend about half a day with all three.

Some notes:

The three were all produced in May 2009 (sticker inside) and their unaligned stock performance was quite similar on weak signals. There were differences... one was always slightly better, one was always in the middle and one was always slightly poorer, but with these three, the performance differences were very slight.

Foolishly, I did not keep one stock and peak the antenna bar on the other two to see how much they improved.  Intuitively, the improvement was slight, if any.  As Gary and others have found, each of my units had the coil over at the left end.

Man. peaking these things is a whole new experience, after a lifetime of peaking up analog circuits without a varactor at work in the circuit simultaneously with the movement of the coil. These things have no real resonant peak.... rather, it is a plateau, or seems so to me. There is obviously a broad range of coil inductances that the varactor will compensate for, so the set is out of resonance at some point (for my three, that is with the coil partly off the bar) or it is in resonance.... as I slide the bar toward the center, there is no change in reception, despite me making major changes in inductance (by the sliding of the coil.)

There is less plastic in the PL-300WT than in the E-100.  The ferrite bar is only supported in a tray under the right-hand half of the bar.  The rest of the bar is suspended.... cantilevered out in space. This is probably why they are so enthusiastic in the use of glue in holding the bare bar onto the little tray under the right-hand half.  I was able to get two of the three antenna bars out, intact, after breaking the first one.  I did not find any "secret" to successful bar removal.... just patience and gentleness.

The varactor makes the antenna circuit so forgiving that I found that I could use my standard Plywood Slider boards and the coils that were designed to work with my E100s for the PL-300WTs.  I hold the radios to the boards with Velcro and have a set-screw arrangement in the Litz wires between the radio and the Sliding coil, so swapping radios and getting things up and running was very easy.

In the next day or two, I'm going to do another comparison of all three 300WT radios.... this time with all of them set up as Sliders.  I'll then pick the two most similar to use in antenna tests and return the third one to stock status for use in the Barefoot Class.

I did make one series of comparative tests last evening.... Between one of the PL-300WTs as an 8" Slider and my favorite TP DX ULR, an E100 8" Slider with the vaunted $50 Murata filter aboard. I checked the performance of the two on about 8 or ten weak signals throughout the domestic band, using my audio switching box that can switch my headphones back and forth instantaneously or put one radio in each ear.  The test was a real revelation.....  I'll be using the PL-300WT as my DOMESTIC DX receiver for the foreseeable future. The reception of these weak signals was at least slightly superior on the 300WT on each and every test frequency!!!  I'll not be doing much domestic DX out here in the Pacific NW, but I was beginning to hit difficult times in Oklahoma with 550 domestics, so a hot new receiver will be most welcome when I return to the Southern Prairie. The difference between the two radios was mostly in intelligibility... The very narrow Murata filter tends to muffle audio unless off-tuned one kHz. and you can't really do that on a very weak signal.  However, beside the boost in intelligibility, the 300WT did also seem a bit more sensitive, over-all. 

I'm going to run a comparison between an E100 Slider without a Murata filter and a 300WT Slider to see if I can isolate/verify the gain in weak signal sensitivity a bit more.

Right now, I'm not convinced that the 300WT is the superior radio for all situations of TP DXing. It certainly has the HUGE advantage of not having to have a very difficult-to-perform IF filter transplant to be useful with off-channel TP or TA DXing.... and useful it will be.  However, there were instances last summer and fall where the Murata-filtered E100 just performed miracles of working in close to domestic channels. I'm thinking of 738 and 747 and even 1 kHz. splits where one could get useable DX signals "backing in" to the DX side of the pile.  Comparing the two sets here by just off-tuning a domestic by two or three kHz., I seem to hear slightly less domestic splatter with the Murata.  I'm not certain that is a totally relevant test. In truth, there is only one way to tell which can work in close the most successfully.... a trip to Grayland :>)

So far, I've not noticed any objectionable AGC action with my three PL-300WTs, and given the amount of weak signal work that I did yesterday, I think that I'd have noticed, were it a problem with these particular sets.  

Back to work!  More later.


 


Re: Ultralight with CW/SSB reception capability??

Paul Shaffer <dxrx@...>
 

Kevin & Al :o)
The Grundig G6 fits the bill as an "Ultralight SSB" radio. I have one albeit with birdies in the AM section. The base G6 has been replaced with the Buzz Aldrin Edition. Nonetheless an adequate performer on HF. The SSB does work well. I've tested it with NY Weather Radio (VOLMET) that broadcasts aviation weather to pilots. Freq's are 3485, 6605, 10050, and 13270 USB. Its useful on 75m also and picks up the "big iron" guys quite well.

I find that the G6 really does need a LX/DX switch... perhaps the only thing lacking in an otherwise solid performer. AIRBAND is near useless... just forget its there... full of FM images.

I've also been able to get a dozen beacons in LW... mostly local. The G5 is better tho.

Universal Radio here in the North East has them, dunno about Radios4You.

Paul S


Re: Disappointed in G8

dhsatyadhana <satya@...>
 

My PL-300WT also has hets on several frequencies, on perhaps 5-10% of the frequencies on the MW band. Many of the hets go away if I detune 2 khz either way, which I do anyway for tone and interference purposes.

So, perhaps my unit is also defective in that way. Since it came from China, it isn't worth the postage to return it and get a new one. Mine also has the momentary chirps described below, especially when tuning through/around strong locals.

Kevin S
Bainbridge Island, WA


I didn't notice any heterodynes 1 or 2 kHz away from stations, so
maybe your G8 does have a problem in this regard. There were very
slight digital tuning noises that occurred when shifting the
frequencies in 1 kHz steps, but these only lasted for a fraction
of a second. Maybe some of the other PL-300WT/G8 owners have some
reports of how their units operate, and whether they have similar
quirks. >


Re: Ultralight with CW/SSB reception capability??

dhsatyadhana <satya@...>
 

Hi Al:

Unfortunately, SSB disqualifies a receiver from being an Ultralight, so an "SSB Ultralight" is something of a misnomer.

At any rate, other than the old Sony SW-100 series radios, which are liable to fail due to dried-up capacitors and other age problems, I don't know of any tiny receiver with SSB. The smallest receiver with SSB that I am aware of is the groups of receivers similar in size to the new Tecsun PL-600; I have tried out what apparently was a lemon PL-600, so I didn't get a very good sense of it: there is a Yahoo group for it, though, which may have a more balanced view of it. The Eton E5/Grundig G5, the Kaito 1102/3, and the Sony 7600GR are other SSB receivers in this size-group; of these, I would recommend the 7600GR from my personal experience, since it is built well, still available new, and seems to have the most stable SSB once it has warmed up for 15-20 minutes, even though the tiny thumbwheel can be fiddly when finding the zero beat on ECSS.

I am curious about the Grundig G3, now due in July, with both SSB and Synch. It's the same size as the G5. Hopefully it won't be "vaporware" like some other eagerly anticipated receivers. I may get one when it comes out.

Hope this helps - Kevin

--- In ultralightdx@yahoogroups.com, "Al" <k3eax@...> wrote:

I need to replace my defective Kaito 1102 which is not a true ultralight. Any recommendations?

Al


Re: Disappointed in G8

m_a_schuster
 

--- In ultralightdx@yahoogroups.com, D1028Gary@... wrote:
I notice signal drop-off when detuning too, and I think it's a
byproduct of the AGC action I described in an earlier message. I'm
not sure I described it clearly (or that even now I understand
exactly what I am observing). I'll try this again: The AGC seems to
have a sharp threshold at which it kicks in. Unfortunately that
threshold is not well chosen; worse, it has a kind of "cliff effect"
rather than being graduated and progressive. This is probably the
only radio I've ever owned that behaves in this way ... but, then,
this is an entirely new design (did I use the term "bleeding edge" in
an earlier post?)
This produces a very unnatural, even paradoxical effect on weak
signals, even when you do not de-tune. You stop in a frequency and
listen for anything in the mud. You hear something and turn up the
volume. Suddenly selective fading is reduced and the AGC "notices"
something is there and kicks in. The volume suddenly rises several
times. You immediately turn down the volume, only to have the signal
fall off the cliff during the next selective fade. And the cycle
repeats. If signal strength has dropped because you de-tuned by 1
KHz, it may also fall under the wheels of the AGC and get thrown down
into the mud.
If you're listening with headphones while this happens, it can be
quite annoying, to say the least. The only remedy I can think of is
to use an additional loop antenna to raise the signal levels to the
point where this effect is not triggered.


Hi Gary,

All the G8 and PL-300WT units here operate exactly as you
describe-- > detuning stations by 1 kHz greatly reduces the audio
level, and reduces the S/N > reading on the display to zero. I think
that for most DXers who are trying > to cut down local splatter as
much as possible, this type of operation would > not be seen as a
problem. 9 kHz-split DXers, in particular, really would
appreciate this drop-off in domestic station strength 1 kHz away
from the > domestic frequencies, which would give TP and TA DXers a
good chance of > logging overseas stations 2 kHz away from the
domestics (i.e. HLCA-972 and > JOBB-828, etc.).

I didn't notice any heterodynes 1 or 2 kHz away from stations, so
maybe > your G8 does have a problem in this regard. There were very
slight digital > tuning noises that occurred when shifting the
frequencies in 1 kHz steps, but > these only lasted for a fraction
of a second. Maybe some of the other > PL-300WT/G8 owners have some
reports of how their units operate, and whether > they have similar
quirks. >
73, Gary


In a message dated 6/25/2009 8:59:09 P.M. Pacific Daylight Time,
gkinsman@... writes:





Hi Gary,

On your G8 and PL-300WT units, does detuning by 1 kHz greatly
reduce the > audio level (and also reduce the S/N reading on the
display to zero)? I had > not expected this effect, as it does not
occur with any other radio I own > that tunes in 1 kHz increments.
It makes the 1 kHz tuning on the G8 sort of > useless for me. (Of
course, none of my other radios have DSP filtering > either.)

Hets or birdies that cannot be tuned around are one of my pet
peeves on MW > (and SW). It's odd that my DT-200VX, which can't tune
in 1 kHz steps, has > far fewer unwanted tones than does the G8,
which has the fine tuning steps. >
One more thing: what's up with that LOUD keyboard beep? It's about
four > times as loud as it needs to be.

Regards,
Gary

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

Hi Gary,

I'm sorry about your disappointment in the G8, to the point that
you wish to return it.

The problem you describe has not been noticed here in the two G8
models, the two PL-300WT models, or in the other four "five
star" > > G8 reviews on Amazon.com. The evidence would indicate that
you > > somehow got a defective model, which would be the first one
reported so far. It happens with every model, but I'm sorry that
it > > happened with yours.

73, Gary




**************Make your summer sizzle with fast and easy recipes
for the > grill. (http://food.aol.com/grilling?ncid=emlcntusfood00000
006)


Another New UL Station- 930-WHLN

John Cereghin <jcereghin@...>
 

Was surprised to pick up a new station for the UL log last night:

930 WHLN Bloomsburg PA, caught partial ID ",,,Newsradio 930, WHLN..." in the mush, into what sounded like standards-type mx, mixing with presumed WDLX in Greenville NC with Braves baseball.  WHLN is listed at only 18 watts at night, which is the surprise, certainly a better signal than 18 watts- maybe on day power (1ooo watts) last night night?  Anyway, UL station 543.  Logged barefoot on the DT-400W- Old Reliable.

With no FM DX since last Monday, I'll take it!

--
John Cereghin
Smyrna DE  FM29eg
KB3LYP/WDX3IAO
www.pilgrimway.org/dx.html
http://www.twitter.com/pilgrimway


Ultralight with CW/SSB reception capability??

Al
 

I need to replace my defective Kaito 1102 which is not a true ultralight. Any recommendations?

Al


Re: Second Grundig G8 Received and Aligned-- With Good QC

krolradio
 

I have not had taken time to order litz wire to add Amidon 7.5 in ferrite rod to my new G8. So I decided to peak the loop stick coil on unit.There was no way I could have slid the coil after taking off as much wax on loop stick.Very carefully I took out complete loop stick out of radio. The bottom of ferrite rod had a little glue & I had to break end tabs.After removing loop stick,I found that peak was when coil slid to the left 3/4 in.That is different to Garys slide to right of 1/4 in.I dont have an inductance meter so I cant say what that is.

My test station is 650 AM 50k Watt in Nashville,TN.Before adjusting loop stick coil I had very weak signal.After adjustment the station was clear.Anyone who has bought this radio can really see an improvement if they take time to adjust coil.Anyone can do this if you have patience & want to have better AM reception. I love the FM on this radio but LW & shortwave is less than expected.

Kim-NC

As in my first G8, the AM loopstick had much less wax securing the coil
than in the two Tecsun PL-300WT's that I've aligned, making the AM
sensitivity peaking procedure go much more quickly. There was a minor gain in AM
sensitivity after I shifted the loopstick coil about .25" to the right on the
ferrite bar, for a final inductance of around 310 uh. Fortunately, it
appears that these units typically have peak AM sensitivity with the coil shifted
a little to the right, since shifting the coil to the left involves
cutting away the left plastic mounting bracket (as Steve Ratzlaff discovered).
73, Gary DeBock (in Puyallup, WA)


Re: Disappointed in G8

Gary Kinsman
 

Hi Gary,

On your G8 and PL-300WT units, does detuning by 1 kHz greatly reduce the audio level (and also reduce the S/N reading on the display to zero)? I had not expected this effect, as it does not occur with any other radio I own that tunes in 1 kHz increments. It makes the 1 kHz tuning on the G8 sort of useless for me. (Of course, none of my other radios have DSP filtering either.)

Hets or birdies that cannot be tuned around are one of my pet peeves on MW (and SW). It's odd that my DT-200VX, which can't tune in 1 kHz steps, has far fewer unwanted tones than does the G8, which has the fine tuning steps.

One more thing: what's up with that LOUD keyboard beep? It's about four times as loud as it needs to be.

Regards,
Gary

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

Hi Gary,

I'm sorry about your disappointment in the G8, to the point that
you wish to return it.

The problem you describe has not been noticed here in the two G8
models, the two PL-300WT models, or in the other four "five star"
G8 reviews on Amazon.com. The evidence would indicate that you
somehow got a defective model, which would be the first one
reported so far. It happens with every model, but I'm sorry that it
happened with yours.

73, Gary


Disappointed in G8

Gary Kinsman
 

Hello all,

I received my G8 from Amazon today, and I'm quite disappointed with it. Many of my strong, local stations have hets or birdies, and detuning 1 kHz up or down makes the signal much weaker, without getting rid of the tone.

These same stations sound fine on my DT-200VX, with no background tone.

Oh well, I guess it was worth a try, but it's going back.

Regards,
Gary


Re: Second Grundig G8 Received and Aligned-- With Good QC

Gary DeBock
 

Hi Kim,
 
Congratulations on successfully aligning your G8 for peak AM sensitivity.
 
We are still collecting information about the G8 (and PL-300WT) AM alignment results, and your information is very helpful. Steve Ratzlaff also did an alignment on his PL-300WT which required shifting the coil off the left side of the ferrite bar for maximum sensitivity (which involves partial removal of the ferrite bar, and cutting away the left plastic mounting bracket for the loopstick). With your result, this procedure has now been found necessary in two out of six AM alignments of the G8 and PL-300WT. I have done four alignments which all peaked the coil on the ferrite bar, and Steve has done one other alignment which also peaked the coil on the ferrite bar.
 
Your G8 is also the first observed which gained a major sensitivity boost on the AM band by alignment, which indicates that the G8 may have the same AM sensitivity variations from the factory that the PL-300WT has. Thanks very much for reporting your results, Kim, and enjoy the DX with your fully-aligned G8!
 
73, Gary DeBock 
 
In a message dated 6/25/2009 9:11:41 P.M. Pacific Daylight Time, krolradio@... writes:


I have not had taken time to order litz wire to add Amidon 7.5 in ferrite rod to my new G8. So I decided to peak the loop stick coil on unit.There was no way I could have slid the coil after taking off as much wax on loop stick.Very carefully I took out complete loop stick out of radio. The bottom of ferrite rod had a little glue & I had to break end tabs.After removing loop stick,I found that peak was when coil slid to the left 3/4 in.That is different to Garys slide to right of 1/4 in.I dont have an inductance meter so I cant say what that is.

My test station is 650 AM 50k Watt in Nashville,TN.Before adjusting loop stick coil I had very weak signal.After adjustment the station was clear.Anyone who has bought this radio can really see an improvement if they take time to adjust coil.Anyone can do this if you have patience & want to have better AM reception. I love the FM on this radio but LW & shortwave is less than expected.

Kim-NC

> As in my first G8, the AM loopstick had much less wax securing the coil
> than in the two Tecsun PL-300WT's that I've aligned, making the AM
> sensitivity peaking procedure go much more quickly. There was a minor gain in AM
> sensitivity after I shifted the loopstick coil about .25" to the right on the
> ferrite bar, for a final inductance of around 310 uh. Fortunately, it
> appears that these units typically have peak AM sensitivity with the coil shifted
> a little to the right, since shifting the coil to the left involves
> cutting away the left plastic mounting bracket (as Steve Ratzlaff discovered).

73, Gary DeBock (in Puyallup, WA)


Re: Disappointed in G8

Gary DeBock
 

Hi Gary,
 
All the G8 and PL-300WT units here operate exactly as you describe-- detuning stations by 1 kHz greatly reduces the audio level, and reduces the S/N reading on the display to zero. I think that for most DXers who are trying to cut down local splatter as much as possible, this type of operation would not be seen as a problem. 9 kHz-split DXers, in particular, really would appreciate this drop-off in domestic station strength 1 kHz away from the domestic frequencies, which would give TP and TA DXers a good chance of logging overseas stations 2 kHz away from the domestics (i.e. HLCA-972 and JOBB-828, etc.).
 
I didn't notice any heterodynes 1 or 2 kHz away from stations, so maybe your G8 does have a problem in this regard. There were very slight digital tuning noises that occurred when shifting the frequencies in 1 kHz steps, but these only lasted for a fraction of a second. Maybe some of the other PL-300WT/G8 owners have some reports of how their units operate, and whether they have similar quirks.
 
73, Gary  
 
In a message dated 6/25/2009 8:59:09 P.M. Pacific Daylight Time, gkinsman@... writes:


Hi Gary,

On your G8 and PL-300WT units, does detuning by 1 kHz greatly reduce the audio level (and also reduce the S/N reading on the display to zero)? I had not expected this effect, as it does not occur with any other radio I own that tunes in 1 kHz increments. It makes the 1 kHz tuning on the G8 sort of useless for me. (Of course, none of my other radios have DSP filtering either.)

Hets or birdies that cannot be tuned around are one of my pet peeves on MW (and SW). It's odd that my DT-200VX, which can't tune in 1 kHz steps, has far fewer unwanted tones than does the G8, which has the fine tuning steps.

One more thing: what's up with that LOUD keyboard beep? It's about four times as loud as it needs to be.

Regards,
Gary

--- In ultralightdx@yahoogroups.com, D1028Gary@... wrote:
>
> Hi Gary,
>
> I'm sorry about your disappointment in the G8, to the point that
> you wish to return it.
>
> The problem you describe has not been noticed here in the two G8
> models, the two PL-300WT models, or in the other four "five star"
> G8 reviews on Amazon.com. The evidence would indicate that you
> somehow got a defective model, which would be the first one
> reported so far. It happens with every model, but I'm sorry that it
> happened with yours.
>
> 73, Gary


Cincinnati AM Dial Updates

Mark Meece <antennapig@...>
 

WDJO 1160 is now WQRT "Real Talk 1160" with a conservative talk radio format.

http://www.realtalk1160.com/

WCIN 1480 will be dropping their callsign for WDJO, that has not officially happened yet.


Thank goodness we finally have Phil Hendrie here,
although I doubt I can hear the station after sunset.


Mark


Down Under Ultralight in New Zealand

tonyzl <tonyzl@...>
 

Have set up my deBock enhanced Tecsun R9012 and pre-sunset scanned the X band. First time in years that I've heard US stations in winter in the late afternoon (0500 UTC). The gain and selectivity beats the Superadio III and Kaito 1102. Using 100m BOG via a tuned ferrite rod and then a 4' square loop –

1570 XERF Villa Acuna MX
1580 KBLA Los Angeles
1580 KMIK Tempe AZ Disney
1610 Caribbean Beacon. Anguilla. The late Gene Scott's widow.
1620 WDHP US Virgin Is. BBC World Service. Newsline.
1640 KDIA Vallejo CA 10kw. Lifestyle/religious
1660 KTIQ Merced CA `La Voz Christiana' 1 kw
1680 KGED Fresno CA 1kw
1700 KVNS Brownsville TX
1700 XEPE Tecate MX 10kw ("San Diego 1700")

I look forward to Sept and October with the fade out of Aussies in the X band

Tony King


Re: Disappointed in G8

Gary DeBock
 

Hi Gary,
 
I'm sorry about your disappointment in the G8, to the point that you wish to return it.
 
The problem you describe has not been noticed here in the two G8 models, the two PL-300WT models, or in the other four "five star" G8 reviews on Amazon.com.  The evidence would indicate that you somehow got a defective model, which would be the first one reported so far. It happens with every model, but I'm sorry that it happened with yours.
 
73, Gary
 
In a message dated 6/25/2009 8:27:58 P.M. Pacific Daylight Time, gkinsman@... writes:


Hello all,

I received my G8 from Amazon today, and I'm quite disappointed with it. Many of my strong, local stations have hets or birdies, and detuning 1 kHz up or down makes the signal much weaker, without getting rid of the tone.

These same stations sound fine on my DT-200VX, with no background tone.

Oh well, I guess it was worth a try, but it's going back.

Regards,
Gary


Re: Down Under Ultralight in New Zealand

Gary DeBock
 

Wow Tony,
 
Those are some fantastic loggings, especially the Caribbean catches of Anguilla-1610 and WDHP-1620. To my knowledge, nobody has ever heard such distant DX with an analog Ultralight.
 
Just when we thought the South African ULR DXers had the distance records locked up, they may now have some serious competition :>)  Your Caribbean catch of Anguilla-1610 heard from New Zealand looks very close to the record logging of KMOX-1120 heard by Gary Deacon, in South Africa.
 
Have fun with your new R9012, Tony, and I'm planning to take one along to Grayland next month, in hopes of being the first North American DXer to hear New Zealand with a stock Ultralight (not much compared to your Caribbean successes, I'm afraid).
 
73, Gary    
 
In a message dated 6/25/2009 4:39:10 P.M. Pacific Daylight Time, tonyzl@... writes:


Have set up my deBock enhanced Tecsun R9012 and pre-sunset scanned the X band. First time in years that I've heard US stations in winter in the late afternoon (0500 UTC). The gain and selectivity beats the Superadio III and Kaito 1102. Using 100m BOG via a tuned ferrite rod and then a 4' square loop –

1570 XERF Villa Acuna MX
1580 KBLA Los Angeles
1580 KMIK Tempe AZ Disney
1610 Caribbean Beacon. Anguilla. The late Gene Scott's widow.
1620 WDHP US Virgin Is. BBC World Service. Newsline.
1640 KDIA Vallejo CA 10kw. Lifestyle/religious
1660 KTIQ Merced CA `La Voz Christiana' 1 kw
1680 KGED Fresno CA 1kw
1700 KVNS Brownsville TX
1700 XEPE Tecate MX 10kw ("San Diego 1700")

I look forward to Sept and October with the fade out of Aussies in the X band

Tony King