It could just be the silkscreen, but is there a ball of solder between pins 2 and 3 of the PCM1804 IC (IC407)?
Jonathan KN6LFB
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The pin farthest from the edge of the board on X401 looks like it isn't completely soldered. Try reflowing it.
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Colin - K6JTH?
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After building my kit I very quickly put it on Ft8 to check it out. It received apparently ok. With pskrporter I saw my transmissions registered all over north America. I then plugged in a head set and heard Nothing. Tried a second headset still nothing. Switched the CW keyer to practice mode, no audio. If I use a cw key and put a power meter on when I key the paddle I get about 4 watts out.
There is a click when I power up and power down, but when on receive or during CW practice mode there is just no audio what so ever.?
I've looked over the board with a loupe at least 20 times. My soldering isn't professional but I don't see any missing smd parts, broken smd parts, or really bad solder joints. I've attacked an image incase someone knows an obvious location to look.?
Any help in where I could look next for trouble shooting would be greatly appreciated.?
73, Don KC9ZMY
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Re: QMX - intermittent power up
that didnt work. dead as a doornail at 9V
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Re: Another QMX Takes to the Air
Great job, Mike ! Hope to hear you on mine. Mine just passed the ¡®smoke test¡¯ ! Yesss ! 90 ma at 12V.
73, Jamie
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On Aug 27, 2023, at 8:01 PM, Mike Besemer - WM4B <mwbesemer@...> wrote:
?
<<...>> <<...>>
Greetings all,
My QMX has been complete for a while, but I¡¯ve been traveling and only had a chance to put it on the air for the first time today.?
First contact was on FT8? with HI3K at a distance of? 1200 miles using 4.5 Watts into a non-resonant? dipole in my attic.? It was a fun kit to build!? Looking forward to more FT8 and CW fun!
Great job, Hans!
73,
Mike
WM4B
<20230827_200753.jpg> <20230827_200746.jpg>
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Another QMX Takes to the Air
<<...>> <<...>>
Greetings all,
My QMX has been complete for a while, but I¡¯ve been traveling and only had a chance to put it on the air for the first time today.?
First contact was on FT8? with HI3K at a distance of? 1200 miles using 4.5 Watts into a non-resonant? dipole in my attic.? It was a fun kit to build!? Looking forward to more FT8 and CW fun!
Great job, Hans!
73,
Mike
WM4B
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I set the "Japanese bands" limitation with Putty and it prevented any use of bands higher than 20M. I unabled the "Japanese bands" and now my Hi-band QDX works like a charm.
73 - Pierre - FK8IH
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Re: is there anyone who would be willing to replace the si5153a synthesizer chip on my qcx?
I'd have better luck tying a bow tie onto a deer tick than replacing that!? Best of luck, really.
K3RTA?
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Re: QMX - smoke - another C107/Q108 failure
I have worked on about 20 different QMX rigs for fellow hams. ?I made up a set of linear regulated ?PS boards for this kind of testing. ?3.3V from the existing linear regulator and 5V from a bench supply (fed from a hacked and burned up SMPS board) that I can control and measure the current. ?Feeding the ADC_ lines as well. ?This all works well and is very helpful in isolating problems and quickly confirming the main circuitry. ?One of my best tools.
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Thanks, Hans.?
At least now I know that it's not me.? I really have missed the really sharp, yet clear filtering of adjacent signs and low RX noise floor from an earlier radio in your line of stuff.?
72,
Ted
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Re: QMX - intermittent power up
Phil, Set your voltage to 8 or 9 volts.
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Show quoted text
On Aug 27, 2023, at 6:03 PM, PHILIP GRAITCER via groups.io <pgraitc@...> wrote:
?When I plugged in QMX (built for 12V) and pushed left encoder, nothing happened (power set at 7V/200ma limit). Pushed it a few more times, and power did come on at 165ma, but then went off. Tried several more times and got it to go on intermittently, but it wouldn't stay on, only a few seconds.??
Touched up the left encoder soldering as well as 2X4 pin control board header, thinking that was the problem. Also removed and touched up the 2x4 and 2X3 female pins on both sides of the power supply board. Checked for continuity on 2x4 male header on control board to the main board and it was okay (I had to remove the 2X4 female header during construction since it wasn't straight and repositioned it, so I? thought maybe an issue with the female header.)
Now I am not getting it to go on intermittently as earlier.??
What's next to try?
Phil, K3UT
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Sorry if this is covered elsewhere (I¡¯ve tried ¡)?
I¡¯d like to modify my ¡°first edition¡± QDX to receive on 15m. ?It¡¯s not entirely clear to me to what extent the hardware and firmware modifications that have been made to provide higher band capability can be used with my build to achieve that aim. ??
Please would someone help me eg by pointing me to the manual or discussion topic that might provide answers??
73
Rod
G0VKX
one-time G8FJN
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QMX - intermittent power up
When I plugged in QMX (built for 12V) and pushed left encoder, nothing happened (power set at 7V/200ma limit). Pushed it a few more times, and power did come on at 165ma, but then went off. Tried several more times and got it to go on intermittently, but it wouldn't stay on, only a few seconds.??
Touched up the left encoder soldering as well as 2X4 pin control board header, thinking that was the problem. Also removed and touched up the 2x4 and 2X3 female pins on both sides of the power supply board. Checked for continuity on 2x4 male header on control board to the main board and it was okay (I had to remove the 2X4 female header during construction since it wasn't straight and repositioned it, so I? thought maybe an issue with the female header.)
Now I am not getting it to go on intermittently as earlier.??
What's next to try?
Phil, K3UT
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QMX - intermittent power up
When I plugged in QMX (built for 12V) and pushed left encoder, nothing happened (power set at 7V/200ma limit). Pushed it a few more times, and power did come on at 165ma, but then went off. Tried several more times and got it to go on intermittently, but it wouldn't stay on, only a few seconds.??
Touched up the left encoder soldering as well as 2X4 pin control board header, thinking that was the problem. Also removed and touched up the 2x4 and 2X3 female pins on both sides of the power supply board. Checked for continuity on 2x4 male header on control board to the main board and it was okay (I had to remove the 2X4 female header during construction since it wasn't straight and repositioned it, so I? thought maybe an issue with the female header.)
Now I am not getting it to go on intermittently as earlier.??
What's next to try?
Phil, K3UT
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New Chat: QDX high band V5 no transmit above 20M
#chat-notice
A new chat has been created:
Hello.
I posted recently about this issue but thought I would explain a little more.
The reception on all the high bands is excellent but it will only transmit on 20M or it will also try to load up on 40 and 30M.
I installed the jumper that was supposed to force the rig to highband but it does not.
Thanks,
Andrew
K6STN
By:
Andrew Steen <k6stn.1@...>
View/Join This Chat
Do not reply to this message to post to the chat. You can participate in chats only through the group's website.
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Re: QMX where can I find the future
#qmx
The software is still very much at an alpha stage. There are quite a few usability bugs to sort out. Soon, I am sure the big features will be ready. I haven¡¯t been planning on SSB till next spring. I can QSO in CW and all single tone digital now. Hans has mentioned he has bugs, goals and hopefully ¡°reach goals¡± to work on. The goals include enabling the SWR meter and implementing high SWR power reduction. I am not sure if SSB is a goal or a reach goal. ?
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Colin - K6JTH?
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Giuseppe it looks like you have 2 turns of the #22 (0.60 mm) wire on the T507 transformer. I believe the #22 wire should only got through each side of the core one time!!
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73, Rick
VE7TK
Website:
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I just completed the high band version (5) of the QDX.
Everything seems to be correct and all continuity tests are a go.
Problem is it will not go above 20M.
I have installed the jumper, but no go.
Any ideas
73,
Andrew K6STN
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Re: QMX RX "carrier" noise
Thank you Mike and Mike. I didn't know this had not yet been implemented in firmware.? All part of the fun. Each FW update is like a little gift.
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Re: Message repeat doesn't
#qmx
Yep. That works! Thanks, Jonathan!!
73, Randy,? KS4L?
On Sun, Aug 27, 2023, 10:13 AM Jonathan Burchmore < burch@...> wrote: Hi Randy,
Are you starting transmission by pressing the right encoder or the left (select) button?? The QMX works the same as the QCX series in that the left button repeats but pressing the encoder only sends once.
I have experienced a lot of glitchiness with the QMX messages.? In my case it appears that most of the problems were due to corrupted message configurations from editing in the terminal with my backspace key set incorrectly.? However, after a factory reset and configuring the messages using the CW decoder it does appear that repeat works properly.? Firmware 1_00_009.
Jonathan KN6LFB
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Colin Kaminski
Donald Gover
Mike Besemer - WM4B
Pierre - FK8IH
Rick Williams - VE7TK
Randy