Re: #qmx video: 52 tips for building your QMX successfully
#qmx
So to clarify - The manual at Rev H currently says to burn or drill out the center of the spacer nuts on the power board - That is no longer recommended according to the video?
|
Message repeat doesn't
#qmx
Perhaps this has already been reported, but in the Message menu, setting Interval to 7 seconds, and repeat to 3 only sends the message once (Message 1, if it matters).
73, Randy, KS4L
|
Re: QMX 9 volt current consumption and a 9 v upconverter?
That’s my plan too. Got the QMX but upconverter is on the slow boat from China… PD seems risky. Another post about the PD negotiation and starting on 5V then a fast increase kills the QMX. Should be OK if plug the QMX in last. Any way gonna test the upconverter cable too first before use.
/Daniel, SA7DAI
|
Type C USB Connector on USB2
Does the QMX depend on having full USB3 support at the PC level, or can an USB Type C adapter be used? I am looking at ordering a QMX, but do not have USB3 available. I do have a multiple input USB3 adapter on one USB2 port. Thanks in advance, Billy (N5SE)
|
|
|
Re: QDX - Stuck in transmit mode when using VOX even after disconnecting PC.
jlloydham,
Could it be from the power supply?? Maybe a local RF source in the shack?? Long shots, as the sound system is all digital inside the processor.
73
Evan
AC9TU
|
Re: New QRP-Labs product idea? A QMX/QDX based digimode / cat interface?
OT sucessfully build your interface for my ic706 the only problem i have is adjusting. I have mo sweet point where ptt gets triggered and alc is zero for ft8. Any idea ??
Mny tnx/
/OT
|
Re: IS THERE ANYONE WHO WOULD BE WILLING TO REPLACE THE Si5351A SYNTHESIZER CHIP ON MY QCX?
I’m happy to do that for you. ?Only pay postage and parts plus whatever donation you want. ?I’ve done a bunch of these.
send it to me at
Jeff Moore
464 Route 28
Harwich Port, Ma 02646
|
A Great Source for Power Supplies (FREE)
I recently had a problem with my home internet. I noticed that when he replaced the modem or modem/router, he reused the existing power supply (wall wart). I asked him if I could have the unused power supply. It was a 12v 1A regulated supply (not class 2's which are unregulated). He said that I certainly could have it and, in fact, he literally had a bucket full of them in the truck. He happily gave me a dozen of them. Most were 12volts but there were several different amperages. He said they just throw them in the trash at the end of their day because they don't recycle them. All of the supplies had the usual barrel connector that perfectly fit my QMX.
Happy hunting!!
Chris - KE8VOD
|
Re: #qmx video: 52 tips for building your QMX successfully
#qmx
Hello Hans,
Thank you for the excellent Video. I think I can use it for the building of the QMX, which arrived me yesterday without any problems.
Vy 73 de Dc4kjs?
|
Re: is there anyone who would be willing to replace the si5153a synthesizer chip on my qcx?
Hi Rick,
There must be someone nearby who can help you out, just in case you want to try yourselves with a regular soldering iron: here is how I do it:
1. add excessive solder on both sides of the IC, then by quickly alternating the iron tip from one blob to the other you can keep them both melted, when that happens you can shift the part away from the footprint, and it is removed.
2. cleanup the solder tip with a wet sponge, and heat the solder that is left over on the footprint, repeat; heat only quickly and without force so that the footprint will not get damaged.
3. place the new IC on the footprint with the dot on pin 1 and pins centered on the pads, press the IC to the PCB when aligned and heat the pins, do not add any additional solder as this will create bridges. make a photo with your phone, zoom-in and inspect.
|
That's exactly how I wound mine, Nick.
Its also exactly as per the picture of the Stockton bridge in the NorCal power meter PDF linked earlier in this thread, so I think you are good to go.
73 Jon
|
Re: Power supply for pre-assembled QMX
Hello Sholto
I made a note on your order? 73 Hans G0UPL
I have the same question Hans. Is it possible for invoice 72091 to be made for 9V?
|
Re: IS THERE ANYONE WHO WOULD BE WILLING TO REPLACE THE Si5351A SYNTHESIZER CHIP ON MY QCX?
If you have a soldering iron then you do have the equipment. Use a bevel or chisel tip.
|
Perhaps it's easier if I post a picture? Can anyone tell whether this is correct?
|
Re: No Sound Card digital modes
Hi All
The use of audio as the universal way of transferring digital Signal modes between a PC and a radio transceiver makes lots of sense in many ways. Every radio transceiver for more than a century has an audio output and if it's a phone transceiver, an audio input. So the digimodes software writer knows that his software will be automatically compatible with every radio in excistence.?
The moment a Digi mode software starts producing custom ways of sending out digital symbol information, it's no longer compatible with anything. And every radio model then has to update it's capability (if it even is possible) to handle these messages.?
So it's not really a logical direction.?
The way QDX and QMX are designed with the built in USB sound card emulation, the transfer of audio between PC and transceiver is lossless, distortion free, hum free, etc. It's quite straightforward and fast, and incredibly accurate, measuring the audio frequency and applying it at RF. So the system as it stands, doesn't cause any problems and wouldn't be improved by any other method.
On Sat, Aug 26, 2023, 1:24 PM Vojislav [YU4HAK] < batica@...> wrote: Wsjtx does however at least show what is being sent and received in two places other than the screen. In the UDP data stream, and logged in the all.txt file.
What I managed to do for my experiment is to track the all.txt file with a small node.js app, encode that message to ft8 frequency offsets and send that number via serial port to the Arduino that controls the si5351.
It is clumsy but it kinda works. And no visible latency either.?
While this is far from finished and useful, it is an idea how annoying "audio coupling" between wsjtx and a transceiver that does direct signal generation can be done with a small software shim.
In theory, it wouldn't be too hard to add optional "current message output" to existing wsjtx cat serial data, but haven't explored that yet.?
|
hello Nik, if they can help you but I'll give you some photos of my QMX, I'm waiting for the replacement power supply board because I got Q103 trying to unsolder it.? 73 and have a nice day Giuseppe iu8eun
It would be useful if the next documentation update would show a clear and totally unambiguous photograph (or two) to show how this entire T507 assembly ought to look when mounted in the QMX PCB. Until then if anybody is able to post any such I photographs then I suspect several builders might appreciate it.There is a? photo in the 1_00h assembly manual but it doesn't clearly show whether the thin wire in to the core hole at the left of the picture then comes back at the 'top' or the 'bottom'.
|
It would be useful if the next documentation update would show a clear and totally unambiguous photograph (or two) to show how this entire T507 assembly ought to look when mounted in the QMX PCB. Until then if anybody is able to post any such I photographs then I suspect several builders might appreciate it.There is a? photo in the 1_00h assembly manual but it doesn't clearly show whether the thin wire in to the core hole at the left of the picture then comes back at the 'top' or the 'bottom'.
|
Re: QDX - Stuck in transmit mode when using VOX even after disconnecting PC.
On 27/08/2023 05:53, jlloydham wrote: One or two times per operating session my recently assembled Rev 4 QDX fails to return to receive mode after a transmission completes. This reminds me of reports caused by RF (getting in the USB cable?), the QDX locks up. Is it a borderline case? 73 Alan G4ZFQ
|
Re: #qmx video: 52 tips for building your QMX successfully
#qmx
I agree about pushing the power
connection to the board edge. I did that and there's enough
clearance not to need adding insulation.
Otherwise what I did was to wind the
toroids first and do a dry assembly of everything in the LPF area
to make sure that everything fitted.
Then solder everything more or less
from the outside in, finishing with the toroids.
A few other thoughts:-
When fitting the connectors between the
boards I fit the boards together with the connectors then solder a
couple of pins on each connector while fitted together so they jig
each other.
I squeezed the pins for the PSU boards
together slightly so they touched the board.
When soldering the BNC fit the display
and main boards together in the top of the case with the BNC
attached to the end plate and the plate fitted to the top half of
the case. Maybe the other end plate also fitted.? This holds the
BNC and main board in the correct orientation while you solder it.
Chris, G5CTH
toggle quoted message
Show quoted text
Hans, I can add one tips:
When installing the input power connector, push it towards the
board edge.
This will increase the very small clearance to the left encoder on
the control board.
Nevertheless I put kapton tape on the encoder body facing the
power connector
73 de SM5EIE /Gunnar
|
Randy
SA7DAI
N5SE
Chris Groman
Stefan