Re: Some CW issues with QMX
Hey Kiril,
i am facing the same issues.
Sidetone Volume control is not yet implemented in the Firmware, we need to be patient until ot done in one of the next updates.?
Iambic B keyer issue in FW 01.010:
Today have made two CW QSO and experienced also dit/dah at the wrong position und sometimes the keyer stuck for a moment.? As a test I disabled all options (SWR, BATT, S-Meter) but it did not cure the problem with the keyer.?
73 de Alex, DK4FT?
Hey guys. On my QMX with the latest firmware the side tone volume control is not working. It does not matter what value is there, the volume of the side tone is full max. It lowers it the global volume control, but i want to make it lower than the signal i receive as i do on the QCX mini.
Also the dits and dahs are messed up from time to time even when sending automatic messages.
Anybody else has such issues?
73 de LZ3OM
|
Re: Some CW issues with QMX
I communicated with sidetone issue and the code issue with Hans privately. I understand he is working on the sidetone issue.
I'm not sure if it's reported before, but I did notice strange keying hiccup, sticky keydown and in one case the whole QMX hang up during transmit. In that session I used a straight key for about 3 hours straight. I used a Navy Flameproof, which makes very little contact bounce (a very large and smooth contact patch). Sometimes, my key up motion does not immediately stop transmission. Sometimes my key down does not start transmission. It seems to happen once a minute or something of that order.
|
Re: This should be BANNED!
Are you sure the winding ratio was kept the same?
RF power amp generally works along a simple load line (Vsupply - VDSsat)^2 / (k * Zload) and so changing the Zload can have a big impact on the RF power pulled from the amplifier. In case of inverse class D/F in QMX, k is close to 1. VDSsat for BS170 is about 1 to 1.5V. Since it is push-pull, the actual amplifier output is double that power from the formula. The Z is also that of each half. This formula is not meant to be an exact model, but if the reality is far from it, something likely went wrong.
|
Hey guys. On my QMX with the latest firmware the side tone volume control is not working. It does not matter what value is there, the volume of the side tone is full max. It lowers it the global volume control, but i want to make it lower than the signal i receive as i do on the QCX mini.
Also the dits and dahs are messed up from time to time even when sending automatic messages.
Anybody else has such issues?
73 de LZ3OM
|
Re: This should be BANNED!
Wont this fry the PA transistors?
|
Re: QDX not providing audio after bootup
Hi, After many times observing this problem remotely I was able to see it happens, and two additional clues are given.
- The QDX is left (indefinitely) with the led blinking as if it was transmitting.
- It is not transmitting.
As observed remotely the problem workaround is a quick band change and then going back to the original band. I might be wrong, but doesn't look really an environment driven situation. 73 de Pedro, LU7DZ
|
Re: QMX: Using 4 x TN0110R3-G instead of BS-170
The part is MICROCHIP:
TN0110N3-G
|
QMX: Using 4 x TN0110R3-G instead of BS-170
Hi, I was curious how different the QMX TX would behave with TN0110. Here are the results. V_ps = +12V, Into a 40 dB 25W dummy load, RF power (W) measured by the calibrated Power meter. The RX voltage?with BS-170 was 0.7 V, with TN0110 was 0.8 V. RF power in Watts. freq. -(BS-170) - (TN0110)
7 MHz - 3.41 - 3.44
10 MHz - 4.08 - 3.68
14 MHz - 4.14 - 4.04
QMX Power display:
7 MHz - 3.6 - 3.6
10 MHz - 4.1 - 3.8
14 MHz - 4.2 - 4.2
At +13V DC the RF output power at 14 MHz was 4.74 W (4.9 W).
73 Bojan S53DZ
|
Re: Simulation in general
Many many moons ago I was a working jazz musician. I could listen to anything except “elevator music “. ?Now I’m so old I can’t remember what elevator music is.
toggle quoted message
Show quoted text
On Oct 6, 2023, at 9:17 AM, Donald S Brant Jr <dsbrantjr@...> wrote:
?On Fri, Oct 6, 2023 at 10:17 AM, Ryuji Suzuki AB1WX wrote:
There seems to be a certain tension or even conflict between theoreticians and experimentalists in general, academia, industry or hobby.
This even seems to hold true for their choice of lab/office music.? In my experience at a research lab, David Sarnoff Research Center, theoreticians preferred classical while experimentalists tended towards jazz.? 73, Don N2VGU
|
Re: Simulation in general
Hi Don
I sometimes listen to classical, or Metallica, or AC DC, or blues, or some other (Blondie even), depending on my mood. Or nothing at all, most commonly. So I don't think I fit. It means I am a misfit, I suppose.
On Fri, Oct 6, 2023 at 6:17?PM Donald S Brant Jr < dsbrantjr@...> wrote: On Fri, Oct 6, 2023 at 10:17 AM, Ryuji Suzuki AB1WX wrote:
There seems to be a certain tension or even conflict between theoreticians and experimentalists in general, academia, industry or hobby.
This even seems to hold true for their choice of lab/office music.? In my experience at a research lab, David Sarnoff Research Center, theoreticians preferred classical while experimentalists tended towards jazz.?
73, Don N2VGU
|
Re: Simulation in general
On Fri, Oct 6, 2023 at 10:17 AM, Ryuji Suzuki AB1WX wrote:
There seems to be a certain tension or even conflict between theoreticians and experimentalists in general, academia, industry or hobby.
This even seems to hold true for their choice of lab/office music.? In my experience at a research lab, David Sarnoff Research Center, theoreticians preferred classical while experimentalists tended towards jazz.? 73, Don N2VGU
|
Re: U3S WSPR just steady tones
On 06/10/2023 14:52, Bob Benedict, KD8CGH wrote: I then checked it? with a nearby receiver with a spectrum display and I only see steady tones at 10.140.1 and 10.141.3 for about two minutes. A spectrum is below. Bob, What you should see is four tones occupying about 6Hz bandwidth. But I guess you can not discern that on the RX. Also you may be overloading the RX. It needs a fairly musical ear to actually hear the warble. Many say it is a single tone. What frequency is the U3S set to? 10.140200 +/-100Hz. Exact frequency and timing are the two main problems stopping decodes. I do not remember but the default calibration settings mean a long time to get dead on. It's in the manual. Oh, an old U3S was prone to drifting in frequency, best copy with WSJT-X on a stable RX. But use dummy loads to keep local signals low. 73 Alan G4ZFQ
|
Re: This should be BANNED!
On Fri, Oct 6, 2023 at 03:03 PM, Hans Summers wrote:
I think concluding a 2x improvement is probably overly optimistic; there are a lot of variables from our lab to yours including: power supply voltage, dummy load, and power meter.?
Hi
Power Suppy voltage 12.3 Volt by QMX
dummy load by QRP Labs
power meter by QMX
muhsin TA1MHS? pessimistic :)
73
muhsin TA1MHS
|
Re: -61 mix simulation of RWTST & WTST
If we were making different transformer ratio, using two apertures separately could be an option, but for 1:1 for 9-10V supply, just one Guanella is exactly what's needed. But it also needs two RFCs and two DC block caps. For now, I am taking this route to remove any question. Actually, if you haven't given up simulating TLTs, this standard circuit may be a very good and practical "toy project" for sanity check since it should give you known answers.
|
On Fri, Oct 6, 2023 at 10:43 AM, Alan G4ZFQ wrote: I recall having to program marine HF radios using BCD switches. 100 channels pairs, and each digit of the channel pair had to be programmed on a large rotating drum with rotating kernels using binary coded decimal numbers. It took the better part of the morning to program one transceiver from scratch. 73 de Russ, va3rr
Perhaps you are too young to remember the binary code?
Without looking not sure what switches but with 3 switches
000 = bank 1
001 = 2
010 = 3
|
Re: -61 mix simulation of RWTST & WTST
Yes, exactly. Both designs appear to work very well though, at least on my bench.
Given two apertures with virtually nil coupling when used separately it would appear to be possible to have two true and distinct transmission lines on one binocular.
Would that work better? I sure can't say. The current WTST and RWTST are performing well in spite of my inability to completely grok them.
JZ
On Fri, Oct 6, 2023, 10:38 AM Ryuji Suzuki AB1WX < ab1wx@...> wrote: JZ, also keep in mind, we are using the term "transmission line transformer" loosely here. Typically, when we say TLT, we have Guanella and Ruthroff transformers. Guanella forces the currents to be equal but opposite. Ruthroff forces the voltage. We tend to combine those things to build practical wideband matching transformers and baluns. However, WTSTs do not fit into either of those transformers. It can be seen as two Guanella phase inverters that share the magnetic circuit. I'm not sure that can be simulated, even if the model could perfectly accommodate standard Guanella and Ruthroff.
|
U3S WSPR just steady tones
I dusted of my old U3S with QLG1 set up with a 30 m filter. I have it attached to my shack doublet up at 35 feet and tuned for 10,140,200. During transmission I see .2 watts out with my QRP power meter. I never saw any decodes on a reporter. I then checked it? with a nearby receiver with a spectrum display and I only see steady tones at 10.140.1 and 10.141.3 for about two minutes. A spectrum is below.
Firmware V3.12 Settings
Xw = 0
Iv=0
Frame=10
Start=00 also tried 02
Cal=09 then 01
Step=240
Park=2
Freq=100,000,000
I've been over and over the manual and can't find a solution. Any idea why this is happening?
--
? 73
??? KD8CGH
|
Thanks Alan. Never even entered my head that. Oh dear. Will have a play tomorrow.
73
|
On 06/10/2023 13:54, Roger G4IUP wrote: I must be very brain fogged today. Can someone please explain how to select any one of 8 banks of programmed frequencies by just using the 3 inputs Band 0, Band 1 and Band 2. Hans gives an example in the manual but I just don't get it. It was my 76th birthday last week and I gave myself credit for still having a functioning brain, mmmm well maybe not!! Roger, Perhaps you are too young to remember the binary code? Without looking not sure what switches but with 3 switches 000 = bank 1 001 = 2 010 = 3 111 =8 73 Alan G4ZFQ
|
Re: Simulation in general
Ryuji:
I'm one of those guys who knows EE things just enough to be dangerous. I'm much more comfortable working in software than hardware. The T41-EP Software Defined Transceiver project has taken over 4 years so far. During that time, there have been hundreds of simulations of almost every aspect of the rig. Our Beta test group now has 15 members so we can give any suggestion a pretty good test bed.
My point is: there have been hundreds of posts by readers who may only be doing simulations, but we have cherry-picked the ones to test and that do improve the original design. Indeed, the "EP" in the rig's name stands for "Experimenters Platform". We want people to play with the radio. We use 7 boards to encourage experimentation and we made their size 100x100mm or less so experimenters could take advantage of PCB companies who give price breaks on smaller boards. While simulations may say one thing, the real test is when the components hit the PCB. Fortunately, there are a lot of people out there beyond the Beta group who say: "Hey, that looks promising!" and proceed to actually build the circuit. The T41 owes a lot to both the Beta and non-Beta people who continue to advance the design.
It's the mix of simulations and experimenters that moves things along...
Jack, W8TEE
On Friday, October 6, 2023 at 10:17:09 AM EDT, Ryuji Suzuki AB1WX <ab1wx@...> wrote:
I don't know if I wrote this before. There seems to be a certain tension or even conflict between theoreticians and experimentalists in general, academia, industry or hobby. Then there are simulator guys complicating the picture. I am an outsider to that conflict, and I like to stay out of it. I think most good engineers see value in all of them.
In analog and RF engineering, there are a lot of things that cannot be measured directly but matter a great deal. Experimentations validate the theoretical understanding and the theory fills what cannot be measured. Simulation can fill in-between, but that is if the models are correct and the relevant parasitic elements are appropriately incorporated. Without great care to ensure simulation reflects the problem in question, we can be deceived to believe incorrect conclusion with confidence.
Experimentation results, interpretation and discussion are not to be construed as an immediately advisory for design revision. If such an expectation is implicitly imposed, we cannot discuss much and there won't be any progress.
|
Ryuji Suzuki AB1WX
Dr. Pedro E. Colla (LU7DZ)
Donald S Brant Jr
va3rr
Bob Benedict, KD8CGH
jjpurdum