May I caution here, digital modes are all USB so one does not want the lower bands to change to LSB.
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Show quoted text
Hello Howard
Yes you are correct, at the moment there is only the one USB/LSB setting and it applies to the whole radio, not by band. I will fix it eventually, particularly when it comes to the proper SSB implementation.? On Thu, Feb 15, 2024 at 8:47?AM Howard Lamhut < Howardlam@...> wrote: I have the QMX And I love this radio.The one thing I’m not certain if it has or has not been addressed is I love to listen to upper and lower side band audio on 40 m and 20 m.
The only issue is 40 m is lsb ?and 20 m is usb and the qmx does not seem to remember these settings specific to the band.? At this point in time if I set it for 40 m then go to 20 m it forces me to go back to the menu to change it from LSB to Usb.
on the upside the single side band audio on this radio is absolutely superb.
is my observation on this issue correct?
on the final note I have built 4 QRP labs radios and I’m loving all of them. ?
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Re: QCX mini became a little deaf after transmitting near a telescopic balcony antenna
Thank you Ron again!
I checked output pins before soldering and no shorts or low resistance to ground.
After that I soldered FST3253 from QRP-Labs and everything works like before. Only performed alignment again to be on the safe side.
Voltage on IC legs (from troubleshooting page) as expected about 2.4V.
br,
Yuri
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Hello Howard
Yes you are correct, at the moment there is only the one USB/LSB setting and it applies to the whole radio, not by band. I will fix it eventually, particularly when it comes to the proper SSB implementation.?
On Thu, Feb 15, 2024 at 8:47?AM Howard Lamhut < Howardlam@...> wrote: I have the QMX And I love this radio.
The one thing I’m not certain if it has or has not been addressed is I love to listen to upper and lower side band audio on 40 m and 20 m.
The only issue is 40 m is lsb ?and 20 m is usb and the qmx does not seem to remember these settings specific to the band.?
At this point in time if I set it for 40 m then go to 20 m it forces me to go back to the menu to change it from LSB to Usb.
on the upside the single side band audio on this radio is absolutely superb.
is my observation on this issue correct?
on the final note I have built 4 QRP labs radios and I’m loving all of them.
?
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I have the QMX And I love this radio.
The one thing I’m not certain if it has or has not been addressed is I love to listen to upper and lower side band audio on 40 m and 20 m.
The only issue is 40 m is lsb ?and 20 m is usb and the qmx does not seem to remember these settings specific to the band.?
At this point in time if I set it for 40 m then go to 20 m it forces me to go back to the menu to change it from LSB to Usb.
on the upside the single side band audio on this radio is absolutely superb.
is my observation on this issue correct?
on the final note I have built 4 QRP labs radios and I’m loving all of them.
?
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Sure Cliff, I tested the QMX both in WSPR independently without using software and in CW, I made a local QSO on 20 meters and the power output is 7 W, so there shouldn't be any problems, I'll have to look at the manual for the settings .? thanks 73
Giuseppe iu8eun
By software I was thinking of ones like fldigi that is used for digital modes as fldigi and some other digital mode software has difficulty with the QMX if Transmit ID is on. It will transmit once and never again unless the QMX is power cycled.
I suspect WSPR should work fine.
My other question was if you tested the QMX transmit in the QMX's builtin firmware config utility to verify it transmits.
On Feb 14, 2024, at 13:54, GIUSEPPE < iw8rsb@...> wrote:
Hi Cliff, what do you mean what software do you broadcast with??? I simply updated the firmware and figured out the QMX with the wspr data.? The first transmission went well, the subsequent ones didn't have any RF output even though I had the SWR at 1 or less than 1. I don't know what it could be.? 73
Giuseppe iu8eun What software are you using to transmit?
Does it transmit in hardware test mode when in the config mode via putty?
73,On Feb 14, 2024, at 04:21, GIUSEPPE < iw8rsb@...> wrote:
good morning everyone, yesterday morning I wanted to do a test with the QMX second high band version with firmware 1_00_015, the first transmission went very well, the time was set perfectly by the qlg1 and it gives me 7 w output, not a single band antenna perfectly tuned to 20 meters with swr 1 or -, the problem is that on the second transmission and all subsequent ones it did not transmit any power, the swr protection was deactivated, have any of you had the same problem or know what it could be, it would be the case update the firmware to 1_00_016?? Thank you and good day.
Giuseppe iu8eun Hi Philip
I just did a single WSPR transmission on 40m with the GPS plugged in. See attached... Not burning any DX but then again my power supply is at 7.5V (12V QMX) and it's 40m and still daytime; furthermore my antenna wire (long side of the OCFD) fell down and lies on the metal roof. It really doesn't work well, it stops the internet working in my entire house, even at such low power! Anyway no SWR tripping...
Stand alone only.
Then that's very strange. I'd wonder in that case if there is some common mode feedline issue (a.k.a. grounding?issue,? a.k.a. in shack), and perhaps adding your GPS connection does something that pushes the SWR over the limit - though SWR and common mode currents aren't the same the causes and symptoms have some relation... to test it, I'd suggest checking with a dummy load.?
If you do still see it on the dummy load then please could you show me exactly what WSPR settings you used and describe it so I can try to reproduce it? Because here everything is running just fine on WSPR with the GPS connected. As a general rule, if there's a software bug, I have?to be able to reproduce it before I can fix it.?
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By software I was thinking of ones like fldigi that is used for digital modes as fldigi and some other digital mode software has difficulty with the QMX if Transmit ID is on. It will transmit once and never again unless the QMX is power cycled.
I suspect WSPR should work fine.
My other question was if you tested the QMX transmit in the QMX's builtin firmware config utility to verify it transmits.
toggle quoted message
Show quoted text
On Feb 14, 2024, at 13:54, GIUSEPPE < iw8rsb@...> wrote:
Hi Cliff, what do you mean what software do you broadcast with??? I simply updated the firmware and figured out the QMX with the wspr data.? The first transmission went well, the subsequent ones didn't have any RF output even though I had the SWR at 1 or less than 1. I don't know what it could be.? 73
Giuseppe iu8eun What software are you using to transmit?
Does it transmit in hardware test mode when in the config mode via putty?
73,On Feb 14, 2024, at 04:21, GIUSEPPE < iw8rsb@...> wrote:
good morning everyone, yesterday morning I wanted to do a test with the QMX second high band version with firmware 1_00_015, the first transmission went very well, the time was set perfectly by the qlg1 and it gives me 7 w output, not a single band antenna perfectly tuned to 20 meters with swr 1 or -, the problem is that on the second transmission and all subsequent ones it did not transmit any power, the swr protection was deactivated, have any of you had the same problem or know what it could be, it would be the case update the firmware to 1_00_016?? Thank you and good day.
Giuseppe iu8eun Hi Philip
I just did a single WSPR transmission on 40m with the GPS plugged in. See attached... Not burning any DX but then again my power supply is at 7.5V (12V QMX) and it's 40m and still daytime; furthermore my antenna wire (long side of the OCFD) fell down and lies on the metal roof. It really doesn't work well, it stops the internet working in my entire house, even at such low power! Anyway no SWR tripping...
Stand alone only.
Then that's very strange. I'd wonder in that case if there is some common mode feedline issue (a.k.a. grounding?issue,? a.k.a. in shack), and perhaps adding your GPS connection does something that pushes the SWR over the limit - though SWR and common mode currents aren't the same the causes and symptoms have some relation... to test it, I'd suggest checking with a dummy load.?
If you do still see it on the dummy load then please could you show me exactly what WSPR settings you used and describe it so I can try to reproduce it? Because here everything is running just fine on WSPR with the GPS connected. As a general rule, if there's a software bug, I have?to be able to reproduce it before I can fix it.?
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Hi Cliff, what do you mean what software do you broadcast with??? I simply updated the firmware and figured out the QMX with the wspr data.? The first transmission went well, the subsequent ones didn't have any RF output even though I had the SWR at 1 or less than 1. I don't know what it could be.? 73
Giuseppe iu8eun
What software are you using to transmit?
Does it transmit in hardware test mode when in the config mode via putty?
73,
On Feb 14, 2024, at 04:21, GIUSEPPE < iw8rsb@...> wrote:
good morning everyone, yesterday morning I wanted to do a test with the QMX second high band version with firmware 1_00_015, the first transmission went very well, the time was set perfectly by the qlg1 and it gives me 7 w output, not a single band antenna perfectly tuned to 20 meters with swr 1 or -, the problem is that on the second transmission and all subsequent ones it did not transmit any power, the swr protection was deactivated, have any of you had the same problem or know what it could be, it would be the case update the firmware to 1_00_016?? Thank you and good day.
Giuseppe iu8eun Hi Philip
I just did a single WSPR transmission on 40m with the GPS plugged in. See attached... Not burning any DX but then again my power supply is at 7.5V (12V QMX) and it's 40m and still daytime; furthermore my antenna wire (long side of the OCFD) fell down and lies on the metal roof. It really doesn't work well, it stops the internet working in my entire house, even at such low power! Anyway no SWR tripping...
Stand alone only.
Then that's very strange. I'd wonder in that case if there is some common mode feedline issue (a.k.a. grounding?issue,? a.k.a. in shack), and perhaps adding your GPS connection does something that pushes the SWR over the limit - though SWR and common mode currents aren't the same the causes and symptoms have some relation... to test it, I'd suggest checking with a dummy load.?
If you do still see it on the dummy load then please could you show me exactly what WSPR settings you used and describe it so I can try to reproduce it? Because here everything is running just fine on WSPR with the GPS connected. As a general rule, if there's a software bug, I have?to be able to reproduce it before I can fix it.?
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Re: IQ mode Enabled on version 16
#qmx
Thanks Adrian and Jim,
Glad I am not the only one.? Being a CW wannabe, but no where close to actually using it effectively, the SDR functionality is quite important to me, and seriously, the QMX pulls stations from everywhere.? It is absolutely great.??
No worries - will stick to V-14 until our guru "Hans" presents a solution.
73 de ZR6TM
Timo
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What software are you using to transmit?
Does it transmit in hardware test mode when in the config mode via putty?
toggle quoted message
Show quoted text
On Feb 14, 2024, at 04:21, GIUSEPPE < iw8rsb@...> wrote:
good morning everyone, yesterday morning I wanted to do a test with the QMX second high band version with firmware 1_00_015, the first transmission went very well, the time was set perfectly by the qlg1 and it gives me 7 w output, not a single band antenna perfectly tuned to 20 meters with swr 1 or -, the problem is that on the second transmission and all subsequent ones it did not transmit any power, the swr protection was deactivated, have any of you had the same problem or know what it could be, it would be the case update the firmware to 1_00_016?? Thank you and good day.
Giuseppe iu8eun Hi Philip
I just did a single WSPR transmission on 40m with the GPS plugged in. See attached... Not burning any DX but then again my power supply is at 7.5V (12V QMX) and it's 40m and still daytime; furthermore my antenna wire (long side of the OCFD) fell down and lies on the metal roof. It really doesn't work well, it stops the internet working in my entire house, even at such low power! Anyway no SWR tripping...
Stand alone only.
Then that's very strange. I'd wonder in that case if there is some common mode feedline issue (a.k.a. grounding?issue,? a.k.a. in shack), and perhaps adding your GPS connection does something that pushes the SWR over the limit - though SWR and common mode currents aren't the same the causes and symptoms have some relation... to test it, I'd suggest checking with a dummy load.?
If you do still see it on the dummy load then please could you show me exactly what WSPR settings you used and describe it so I can try to reproduce it? Because here everything is running just fine on WSPR with the GPS connected. As a general rule, if there's a software bug, I have?to be able to reproduce it before I can fix it.?
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Re: Removing SOIC Chips (QMX IC402)
On Tue, Feb 13, 2024 at 05:13 PM, Bruce Akhurst wrote:
Brain surgery on your latest radio is probably *not* the right way to gain
initial experience
I am NOT new to using hot air to solder SMT. However, removal is something I have only done a couple of times before, on boards that were less dense, hence the request for suggestions. I like the idea of a wooden stick - I have some that I used for winding the QMX toroids that would be applicable. 73 JRJ W9IYN
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Re: 50W PA Input SWR 3 and up! What can I mess with?
Wonderful suggestions - I will check these this evening. T1 has been checked and double checked (and wound twice just for fun) so I don't suspect it. But the other parts deserve a triple check, and it's even possible that D1 is in fact bad or backwards.
I should add that RX performance seems fine with the PA inline (and it must be powered with the green light on only, of course) and power consumption when keyed also increases to a value that seemed inline with expectations with a modest input power, but perhaps I made an error. I will borrow the de-soldering gun from work this evening and report back to the group with my findings and any cautionary tales.?
I really appreciate everyone helping me with my amp. Thank you!
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Re: IQ mode Enabled on version 16
#qmx
Hello Timo,
Most likely a bug, I can reproduce it on my QMX and at least one other fellow ham reported it couple of days ago. Enable IQ from the System config menu and it will work.
Regards,
YO3GFH
op. Adrian
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Re: 50W PA Input SWR 3 and up! What can I mess with?
Hi Andy, Ron,
Ron, good point to check the T/R switching, but check all switching diodes: the RX and TX.
My 50W (QCX) PA is also built with the 20m LPF.
I have just tried?quickly driving it with the QMX and the VSWR measured with the QMX was between 1.7:1 to 2.0:1 for 40m to 20m band. The driving RF power was around 4W.
However, when the PA is unkeyed, it means in RX position, than you should have the thru connection to the output so to the dummy load. The VSWR in this case is not 1:1 but it is not unbearable either. This is the R.L. what the receiver feels.
In addition the internal input 3dB attenuator is built as PI attenuator (330 | 22 | 330 Ohm) for 60 Ohm to 60 Ohm, so there are also some parts of a dB of inherent R.L. difference.
--
73 Bojan S53DZ
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Re: 50W PA Input SWR 3 and up! What can I mess with?
likely causes....
D1 bad or backward.
R2/3/4 in the wrong places or wrong values.
or T1 has a shorted turn(s).
I'll toss in soldering problems.
Note: the 10W linear is not even close to the 50w in general design.
--
Allison
------------------
Post online only,?
direct email will go to a bit bucket.
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QCX+ Glitch Sound Power On & Off
I have just completed and tested a QCX+ and I very pleased with it - a big thank you to Hans and the team. The kit is superb and the build was very enjoyable with excellent documentation and on-line resources.
I have just one small question - when I power the QCX+ on and off from the power button I hear a loud glitch sound in my headphones. Is this normal or is there something I can do to overcome it?
Many thanks,
Nick
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Re: 50W PA Input SWR 3 and up! What can I mess with?
Andy, I tested my 20 Meter 50 watt PA using the NanoVNA and found approximately 2:1 all the way out past 50 MHz. I didn't check higher in frequency. When I unkeyed the amp, the SWR went to infinite across the spectrum as expected because the diode switch (D1) opened the RF path to the attenuator. I think it would be beneficial for you to check it both keyed and unkeyed to make sure diode D1 is properly turning on and off. You should not have to add any more attenuation than what is already there. And you should not have to modify the input circuits. This amplifier is usually?a solid performer as designed.? If you are sure the attenuator is properly built and you have checked connections with an ohm meter, and you are sure all the enamel wire is properly installed then you should look closely at the operation of D1.
73 ... Ron
On Wed, Feb 14, 2024 at 12:04 AM, <kontraptioneering@...> wrote:
it looks to me that there's a very happy frequency that this amp wants to operate, which implies that somewhere, this frequency of 10 Mhz is being set by a certain combination of components - capacitors, inductors, etc?
Could it be C2 or C3? And I don't know about changing the number of turns on T1, but maybe? I could experiment with a few things I guess.? Any suggestions for starting points from the crowd? I've attached the schematic for convenience.?
This isn't the first time this has come up here...I'm curious as well.?
I don't know much, but it is interesting to me/ I wonder why 1 uf caps are used on the input here. On the 10W linear PA kit, it goes straight into BS170s for the first stage, and then some 0.1 uf caps before the IRF510s....... And the input transformer is different.? ?
The WA2EBY also uses 0.1 uf on the input.?
-Nate N8BTR
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On Wed, Feb 14, 2024 at 02:30 AM, Donald S Brant Jr wrote:
On Tue, Feb 13, 2024 at 02:43 PM, Adrian YO3GFH wrote:
In my previous post, I've mentioned very fine grained (800 grit) sandpaper used for shining guitar frets, that's the one you should use.
Or one could use the right tool for the job, a contact burnisher:??
I wonder whether the issue will return after cleaning.? A problem might be that too little current is being handled by the contacts, there is a minimum so-called "wetting current" required to break through contact film/oxidation and allow a low-resistance contact:??
Special contact materials and mechanical configurations are used when switching very low currents, to avoid this issue.? Mercury-wetted contacts are an example.
I do not have a schematic handy but I winder if there is a pullup resistor which might be changed to a lower value to put more current through the key contacts.??
73, Don N2VGU
Now I realise I wrote 800 instead of 8000.. I must've been hungry when I posted :-) so it's 8000 grit sandpaper, I just checked. Need to change my glasses :-) That contact burnisher looks nice, but I haven't seen any mention of grit - judging from the picture, looks a bit coarse but, in all fairness, it's not a hi res pic so might be artefacts. I think you make a good point with the minimum current! Regards, YO3GFH op. Adrian
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Re: IQ mode Enabled on version 16
#qmx
Timo - I am on version 16 and could not get IQ to stay on when I was turning it on in the Digi interface menu. However, when I turned it on from within the System config menu it stays on. That might help. Jim Bennett / K7TXA Eagle, ID
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Show quoted text
On Feb 14, 2024, at 8:03?AM, timo.vandermerwe@... wrote:
?I installed software version 16 on the day it was released.? I use the "IQ mode enable" on HDSDR literally daily and was fine.
Today, for some or other reason, I can set IQ mode to enabled, but as soon as you escape back to the main VFO screen, IQ mode goes back to Disabled.
After several factory resets, going back to version 15, more resets, going back to version 16, some more factory reset, I still can not enable IQ mode.
I moved back to version 14, and all is back to normal.? I can enable IO mode and it sticks.? ? ?
Anyone else seen this.
73 de ZR6TM
Timo?
--
Jim / K7TXA
Eagle, ID
SKCC 10447T
BUG 301
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IQ mode Enabled on version 16
#qmx
I installed software version 16 on the day it was released.? I use the "IQ mode enable" on HDSDR literally daily and was fine.
Today, for some or other reason, I can set IQ mode to enabled, but as soon as you escape back to the main VFO screen, IQ mode goes back to Disabled.
After several factory resets, going back to version 15, more resets, going back to version 16, some more factory reset, I still can not enable IQ mode.
I moved back to version 14, and all is back to normal.? I can enable IO mode and it sticks.? ? ?
Anyone else seen this.
73 de ZR6TM
Timo?
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Re: QMX 20/80m BPF TXswap Clarification
Hans,
Thank you for clarifying the operation of the band swap.
73,?
Steve W6WU?
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Yury SP2RM
Howard Lamhut
cube1us
Ronald Taylor