Re: QDX: Troubleshooting high output power
Right, I was noting the RF sweep because the low pass filters *do* affect receive, so the fact the sweeps are way off could mean something with the LPF section.? Or it could mean I messed up both transformers separately :)
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After I fixed L4/L10, I have not been able to find anything else yet.??
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Is there any way to check the binocular transformer without removing it??
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I wired up an adapter cable for an Icom HM-36 that came with one of my radios.
I had considered removing the mic plug and installing a 3.5mm TRS plug, but I had the components in stock and this preserves the original (new) mic function.
I might decide differently with a hamfest find or generic clone.
73, Don N2VGU
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Thankyou so much for your advice. It was indeed a short pulling oc101vto ground. I had a blob of solder across the capacitor C103, as shown below.?
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With the short removed it nowvworks fine.
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Glad I used a current limited power supply for first power uo!
?
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Re: Sending prosigns via CAT KY
Andreas
I believe you can also interrupt (cancel) an ongoing transmission by pressing the Exit button.?
I don't remember explicitly coding this for the KY command but, since the KY command internally just sets up a temporary message memory and uses the same message memory transmission mechanism, pressing the Exit button (right button) should also cancel KY.?
73 Hans G0UPL
Thanks, Peter, but in my case no paddle nor key was attached and the message is being keyed sopely via CAT KY command.
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(Of course, no serious CW operator would do this, its only for noobs like me who have not finished all letters of Koch' training but still want to participate somehow...)
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Re: #qmx #ssb CESSB update (Controlled Envelope SSB)
#qmx
#ssb
Hans,
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I think Doug is telling you to bump up the price of the QMX.
Please remember your vow of poverty when you signed up as a radio amateur.
?
Jerry, KE7ER
?
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On Mon, Oct 14, 2024 at 10:49 AM, Hans Summers wrote:
Hi Doug
?
It didn't do Dan Tayloe much good did it?? No one who uses the Tayloe mixer in a commercial radio has paid Dan a dime.
?
The Tayloe detector patent (expired) was filed by Motorola, and any license fees would presumably go to Motorola. As a Motorola employee Dan would have been paid a salary and other benefits by Motorola. So arguably, he got paid...
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Re: Sending prosigns via CAT KY
Thanks, Peter, but in my case no paddle nor key was attached and the message is being keyed sopely via CAT KY command.
?
(Of course, no serious CW operator would do this, its only for noobs like me who have not finished all letters of Koch' training but still want to participate somehow...)
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Hi Rick
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I've had my QMX+ since May this year and the tune encoder is simply worn out already! The push button and encoder are now flakey at best.
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Tuning HF works OK, tuning LF there are lots of missed pulses or it randomly tunes HF instead.
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The push button is unreliable.?
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I have an optical encoder that will fit, but the output waveform is a nice 50/50 % waveform with it's counterpart 90¡ã out of phase....rather than the scratchy narrow pulses per notch in the mechanical encoder., which the QMX+ seems to prefer...until the encoder becomes noisy.
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I fully appreciate why the encoder is fitted to the QMX+ ...it's way cheaper than an optical encoder.?
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I've worn out many encoders in my QCXs so it's probably my operating technique....i.e like tuning the band!
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73 Steve G4EDG?
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Re: Sending prosigns via CAT KY
Have I misunderstood your suggestion for the second thing about interrupting a message?? You can already instantly stop an outgoing message by touching either side of the paddle.
?
73
Peter GM0EUL
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The Tune Rate Cursor on my QMX+ has developed a mind of its own? For some reason it randomly cycles through the default tune rate settings. For example if it starts at 100 Hz , to 10 Hz to 1 kHz to 500 Hz. It then repeats at random intervals?
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Here's what I've tried:
?? 1) Reflowed the 3 mating connectors on the Main board.
?? 2) Reflowed the 3 connectors on control board
?? 3) Cleaned ALL the pins on ALL 3 connectors.
?? 4) Cursed at the lack of easy access to the connectors on the control board.
?
Nothing so far has fixed the problem. Since the encoder works as it should and will change the Tune Rate I'm hesitant to consider it faulty.
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Thoughts appreciated - Thanks!
--
73, Rick
VE7TK
Website:
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Re: #qmx #ssb CESSB update (Controlled Envelope SSB)
#qmx
#ssb
Hi Doug
It didn't do Dan Tayloe much good did it?? No one who uses the Tayloe mixer in a commercial radio has paid Dan a dime.
The Tayloe detector patent (expired) was filed by Motorola, and any license fees would presumably go to Motorola. As a Motorola employee Dan would have been paid a salary and other benefits by Motorola. So arguably, he got paid...
It's an interesting history too, the quadrature sampling detector was published by a Dutch author in ARRL's QEX at least 10 years prior to Dan's invention, and a Japanese radio amateur even pre-dates that by a couple of years. Like many inventions they seem to pop up in multiple places and it gets sometimes contentions who was first.?
I myself certainly first became aware of the QSX through Dan Tayloe's work.?
73 Hans G0UPL
73 Hans G0UPL
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Re: Why The EER Method For SSB Generation Works
It's true, there is a long history of attempts at EER going back to Kahn's 1952 paper.
But not not an awful lot of success, especially in amateur gear.
?
In addition to the somewhat wanting Polar Explorer and uSDX,
there was the SGC 500W amp mentioned in these web links:
/g/BITX20/message/64592
So apparently EER has been successful in expensive high power commercial amps.
My impression is that those amps start with a conventional SSB exciter,
then strip off the amplitude and phase information using analog techniques.
?
I must admit, I was somewhat dismissive of Guido's attempts at the time.
But also very intrigued by the possibilities.
?
The QMX is looking like a major milestone.
Looking forward to playing with SSB on the QMX!
?
Jerry, KE7ER
?
?
?
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On Mon, Oct 14, 2024 at 09:29 AM, Hans Summers wrote:
Thanks for the nice explanation. Though QMX wasn't first... EER techniques are I believe, used commericially. In amateur radio:
?
In 2017 the Polar Explorer was explained in a QEX article:
See also the Polar Explorer website:
?
I visited the booth at the 2019 Dayton Hamvention.?
?
Next was the uSDX transceiver by Guido PE1NNZ which evolved from the QRP Labs QCX transceiver. Several people developed versions of uSDX, including many Chinese produced implementations on AliExpress and eBay; Manuel DL2MAN and Guido PE1NNZ run the (tr)uSDX project which is a closed-source version of uSDX distributed by authorized producers only.?
?
Polar Explorer is rather complex and hasn't evolved into a commercial product. And uSDX/(tr)uSDX performance doesn't really qualify it as a serious or reasonable SSB transceiver, as a result of the limited hardware resources (CPU and the rest of the design).?
?
It's fair to say QMX/QMX+ is the first serious successful amateur radio SSB product. But it's very important to recognize the predecessors and remember that we stand on the shoulders of giants! In particular Guido's project really demonstrated and showed the way, we should be forever grateful.?
?
73 Hans G0UPL
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Re: #qmx #ssb CESSB update (Controlled Envelope SSB)
#qmx
#ssb
It didn't do Dan Tayloe much good did it?? No one who uses the Tayloe mixer in a commercial radio has paid Dan a dime.
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George, here's another kit microphone?that will work...
Ron
On Mon, Oct 14, 2024 at 9:51?AM Sean [AK6BM] via <ak6bm.radio= [email protected]> wrote: Wiring diagram already in manual, has been for a while. It's the same as a tru-sdx mic, K6ark mic kits will work.
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Re: QMX + SSB - any hardware mods neded
I am pretty sure he said only firmware. No hardware changes.
I'm excited to see that Hans has got the SSB working in his latest video on YouTube.? I'm just wondering if there will be any hardware changes or mods required to the current QMX+ to use SSB or will it only need the formware update?
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Wiring diagram already in manual, has been for a while. It's the same as a tru-sdx mic, K6ark mic kits will work.
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Hi All,
Please post a CESSB microphone for QMX+ and QMX available on Amazon with a wiring diagram. I know this is posted somewhere, but it deserves it's own topic ? Thank you,
George?
K3GK
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Re: I am still being amazed by the QMX I recently built
It does!
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?Careful or you¡¯ll get addicted!???
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Re: Why The EER Method For SSB Generation Works
P.S.
It's fair to say QMX/QMX+ is the first serious successful amateur radio SSB product USING EER [obviously]
73 Hans G0UPL
Hi Jerry
Thanks for the nice explanation. Though QMX wasn't first... EER techniques are I believe, used commericially. In amateur radio:
In 2017 the Polar Explorer was explained in a QEX article:
See also the Polar Explorer website: ?
I visited the booth at the 2019 Dayton Hamvention.?
Next was the uSDX transceiver by Guido PE1NNZ which evolved from the QRP Labs QCX transceiver. Several people developed versions of uSDX, including many Chinese produced implementations on AliExpress and eBay; Manuel DL2MAN and Guido PE1NNZ run the (tr)uSDX project which is a closed-source version of uSDX distributed by authorized producers only.?
Polar Explorer is rather complex and hasn't evolved into a commercial product. And uSDX/(tr)uSDX performance doesn't really qualify it as a serious or reasonable SSB transceiver, as a result of the limited hardware resources (CPU and the rest of the design).?
It's fair to say QMX/QMX+ is the first serious successful amateur radio SSB product. But it's very important to recognize the predecessors and remember that we stand on the shoulders of giants! In particular Guido's project really demonstrated and showed the way, we should be forever grateful.?
73 Hans G0UPL
After years of reading about the filter and phasing methods of SSB generation, EER can seem mysterious and magical.? How can a single oscillator generate all the needed component frequencies of an SSB signal?
The wire from your antenna at any instant in time has a particular voltage, all signals that the antenna is sensitive to come through that single wire.? Looking at it with an oscilloscope will show the voltage jumping about randomly, this would be impossible to recreate with a single oscillator.
Now assume we send the signal from your antenna through a very good filter, only allowing through one two-tone SSB test signal that is 2000 Hz wide.? This signal is very simple, perhaps the sum of two sine waves of equal amplitude at 7200 and 7202 KHz. ?
From secondary school algebra, the sum of two sine waves of equal amplitude is given by: ? ?sin(a)+sin(b) = 2*sin((a+b)/2) * cos((a-b)/2)
So the result of our sine waves at 7000 and 7002 KHz summed together is a sine wave of 7001 KHz multiplied by (modulated by) a cosine wave (a sine wave with a 90 degree phase shift) of 1 KHz, as shown in the images at ?
If we have a third sine wave in the mix, that can be added to the waveform resulting from the sum of the first two.? Varying amplitudes make an exact solution impossible, but the summation can be accomplished numerically.? This is repeated for as many component sine waves as we wish. ?
Any SSB signal can be broken down into component sine waves through a Fourier transform, and we now know that the sum of those components will be a sine wave of varying amplitude and slightly varying frequency (or phase).? The variations in frequency and amplitude required are quite slow, determined by the audio bandwidth.? Therefore, a single oscillator of which we can control the amplitude and the frequency is sufficient to create an SSB signal.
The theory behind EER was first proposed by Kahn in 1952, the computations required were not then practical but are now within easy reach of a processor such as the STM32F446.? Much to my astonishment, Hans has demonstrated that the frequency of the Si5351 can be controlled accurately and quickly enough to meet the phase requirements of a clean SSB signal, making the QMX the first practical EER SSB transmitter that I am aware of.? EER allows a very efficient final amplifier and a minimal hardware design if we can ignore the millions of transistors and thousands of lines of code inside that $5 processor.? Of course, a $10 broadcast band receiver on Ebay can have a few million transistors in it these days.
?
Jerry, KE7ER
|
Re: Why The EER Method For SSB Generation Works
Hi Jerry
Thanks for the nice explanation. Though QMX wasn't first... EER techniques are I believe, used commericially. In amateur radio:
In 2017 the Polar Explorer was explained in a QEX article:
See also the Polar Explorer website: ?
I visited the booth at the 2019 Dayton Hamvention.?
Next was the uSDX transceiver by Guido PE1NNZ which evolved from the QRP Labs QCX transceiver. Several people developed versions of uSDX, including many Chinese produced implementations on AliExpress and eBay; Manuel DL2MAN and Guido PE1NNZ run the (tr)uSDX project which is a closed-source version of uSDX distributed by authorized producers only.?
Polar Explorer is rather complex and hasn't evolved into a commercial product. And uSDX/(tr)uSDX performance doesn't really qualify it as a serious or reasonable SSB transceiver, as a result of the limited hardware resources (CPU and the rest of the design).?
It's fair to say QMX/QMX+ is the first serious successful amateur radio SSB product. But it's very important to recognize the predecessors and remember that we stand on the shoulders of giants! In particular Guido's project really demonstrated and showed the way, we should be forever grateful.?
73 Hans G0UPL
After years of reading about the filter and phasing methods of SSB generation, EER can seem mysterious and magical.? How can a single oscillator generate all the needed component frequencies of an SSB signal?
The wire from your antenna at any instant in time has a particular voltage, all signals that the antenna is sensitive to come through that single wire.? Looking at it with an oscilloscope will show the voltage jumping about randomly, this would be impossible to recreate with a single oscillator.
Now assume we send the signal from your antenna through a very good filter, only allowing through one two-tone SSB test signal that is 2000 Hz wide.? This signal is very simple, perhaps the sum of two sine waves of equal amplitude at 7200 and 7202 KHz. ?
From secondary school algebra, the sum of two sine waves of equal amplitude is given by: ? ?sin(a)+sin(b) = 2*sin((a+b)/2) * cos((a-b)/2)
So the result of our sine waves at 7000 and 7002 KHz summed together is a sine wave of 7001 KHz multiplied by (modulated by) a cosine wave (a sine wave with a 90 degree phase shift) of 1 KHz, as shown in the images at ?
If we have a third sine wave in the mix, that can be added to the waveform resulting from the sum of the first two.? Varying amplitudes make an exact solution impossible, but the summation can be accomplished numerically.? This is repeated for as many component sine waves as we wish. ?
Any SSB signal can be broken down into component sine waves through a Fourier transform, and we now know that the sum of those components will be a sine wave of varying amplitude and slightly varying frequency (or phase).? The variations in frequency and amplitude required are quite slow, determined by the audio bandwidth.? Therefore, a single oscillator of which we can control the amplitude and the frequency is sufficient to create an SSB signal.
The theory behind EER was first proposed by Kahn in 1952, the computations required were not then practical but are now within easy reach of a processor such as the STM32F446.? Much to my astonishment, Hans has demonstrated that the frequency of the Si5351 can be controlled accurately and quickly enough to meet the phase requirements of a clean SSB signal, making the QMX the first practical EER SSB transmitter that I am aware of.? EER allows a very efficient final amplifier and a minimal hardware design if we can ignore the millions of transistors and thousands of lines of code inside that $5 processor.? Of course, a $10 broadcast band receiver on Ebay can have a few million transistors in it these days.
?
Jerry, KE7ER
|
Why The EER Method For SSB Generation Works
After years of reading about the filter and phasing methods of SSB generation, EER can seem mysterious and magical. ?How can a single oscillator generate all the needed component frequencies of an SSB signal?
The wire from your antenna at any instant in time has a particular voltage, all signals that the antenna is sensitive to come through that single wire. ?Looking at it with an oscilloscope will show the voltage jumping about randomly, this would be impossible to recreate with a single oscillator.
Now assume we send the signal from your antenna through a very good filter, only allowing through one two-tone SSB test signal that is 2000 Hz wide. ?This signal is very simple, perhaps the sum of two sine waves of equal amplitude at 7200 and 7202 KHz. ?
From secondary school algebra, the sum of two sine waves of equal amplitude is given by: ? ?sin(a)+sin(b) = 2*sin((a+b)/2) * cos((a-b)/2)
So the result of our sine waves at 7000 and 7002 KHz summed together is a sine wave of 7001 KHz multiplied by (modulated by) a cosine wave (a sine wave with a 90 degree phase shift) of 1 KHz, as shown in the images at ?https://vk6ysf.com/ssb_2tone_test.htm
If we have a third sine wave in the mix, that can be added to the waveform resulting from the sum of the first two. ?Varying amplitudes make an exact solution impossible, but the summation can be accomplished numerically. ?This is repeated for as many component sine waves as we wish. ?
Any SSB signal can be broken down into component sine waves through a Fourier transform, and we now know that the sum of those components will be a sine wave of varying amplitude and slightly varying frequency (or phase). ?The variations in frequency and amplitude required are quite slow, determined by the audio bandwidth. ?Therefore, a single oscillator of which we can control the amplitude and the frequency is sufficient to create an SSB signal.
The theory behind EER was first proposed by Kahn in 1952, the computations required were not then practical but are now within easy reach of a processor such as the STM32F446. ?Much to my astonishment, Hans has demonstrated that the frequency of the Si5351 can be controlled accurately and quickly enough to meet the phase requirements of a clean SSB signal, making the QMX the first practical EER SSB transmitter that I am aware of. ?EER allows a very efficient final amplifier and a minimal hardware design if we can ignore the millions of transistors and thousands of lines of code inside that $5 processor.? Of course, a $10 broadcast band receiver on Ebay can have a few million transistors in it these days.
?
Jerry, KE7ER
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Donald S Brant Jr
Steve G4EDG
Peter GM0EUL
Rick Williams - VE7TK
Ronald Taylor