Re: Difficulty with the SSB compressor
I figured it out. For some of the SSB config fields you need to type in a value while others need a left/right arrow to change the value. On the compressor field you must use the left/right arrow. If you type in a number it will be accepted but it will give odd results.?
--
Regards,
Earle KC0KVR
|
Re: I made a protective cover for the QMX+ which also doubles as a stand and storage!
Hi Peter! It's a piece of velcro! It's how I attach 2S battery packs to my radio for field use.
I use 2S 18650 holders for FPV goggles, they happen to have the same plug, and come with built in chargers sometimes.
The official velcro brand is extremely strong once the glue sets (24H) and i've never had the strips of velcro come off when removing a battery.
|
QMX Feature Request - On Board CAT/serial monitor tool
What it does: use the LCD to display characters received on the CAT serial port and characters transmitted over the serial port.
?
The RX data could appear on the top line and the TX data on the bottom line. Perhaps an indicator of some sort that shows that data is being received by the QMX. even if the data can't be decoded as printable ascii characters. Perhaps, when the CAT/serial monitor is active then disable the terminal applications mode so that a newline character on the serial port doesn't take over the port for terminal applications.
?
Why? I've been developing? microcontroller code to read VFO A on the QMX and display frequency and band info on a remote LCD. I first wrote a QMX CAT simulator program so that I could test and debug the microcontroller code easily. Also I have verified with PuTTY that the QMX responds correctly to incoming CAT commands. When I connect the microcontroller via USB to the QMX I am unable to establish that the two are communicating. This CAT/serial monitor diagnostic tool would help me answer the questions:
- Is the QMX receiving serial data on the CAT com port?
- What data CAT commands/data is received?
- What is being sent by the QMX over the com port.
This little rabbit hole opened up with this thread: /g/QRPLabs/topic/scripting_language/112779657 ?In which I suggest the OM use a microcontroller to speak CAT to the QMX. But then I asked myself if I could actually accomplish what I suggested and, here we are. I am aware of 8.7.3 CAT command test and 8.7.4? CAT monitor in the manual but it's not clear to me how to connect both a terminal and microcontroller to the QMX over the single USB-C port. It would be very helpful if the QMX itself could tell me on the LCD what is happening on the serial port. ?
Thanks and 73,
Matt
|
On May 19 I had another one of my
CW practice sessions. I worked three stations.
Conditions were OK. SSN=53, SFI=117, A=10, K=2.I used my
Elecraft K3 at 100 watts and a 100 foot sloped doublet. My
next CW practice session will be May 20 at 18:00 EDT / 22:00 UTC on 40 meters.?Anyone
and everyone is welcome. These practice sessions are?
intended for operators who are new to CW or they need some
practice. IT DOES NOT MATTER HOW POOR YOUR CW IS. Mistakes
are OK. Poor fists are OK. Slow speed is OK. Really slow
speed is OK. This practice is meant for you to improve your
CW. I will do my best to adjust to your skill level. Operate
at any power level. If several stations show up, I will
operate as a round-table control station. I will do it as a
round-table so everyone gets a chance to transmit. Please
listen to my directions.
Details:
Date - May 20
Time -?18:00 EDT / 22:00 UTC
Band -?40 Meters
How to find me - I will find a clear frequency and call
CQ. Go to the Reverse Beacon Network and search for my
call sign AB8DF.
That will tell you what
frequency I am on. Tune your station to that frequency
and if you hear me give me a call. If there is a QSO in
progress, please wait for a break in the action. Then
send your call sign. If I hear you, I will invite you to
join the QSO and start a round-table QSO.
Reply to this email if you have questions.
IT DOES NOT MATTER HOW POOR CW IS
Ed
AB8DF_._,_._,_
|
Re: Dreaded dead transmit from SSB Calibration routine
And did you check voltages at G of BS170 (see the link in my first post)?
?
|
Re: Dreaded dead transmit from SSB Calibration routine
Robert, did you measure using an external power meter? If not maybe something is wrong around T507. Please check this document from the QRP Labs Wiki. ?
73 Ludwig
|
Yannig, good idea. But the QMX delivers 3.3 V via 2.2 kOhm. To have 2.5 V for the IC the current must be not higher than 0.36 mA for the IC and the mic. Unfortunately the IC requires 2.3 ... 5 mA in working state. To use this IC you need an external supply (but blocked towards the QMX).
?
73 Ludwig
?
|
Re: Release of version 1.2 of ABS solution for QMX+ (Automatic internal antenna tuner, internal battery and internal speaker with audio amp)
#ABS
#ATU
#PSU
#QMXplus
Please add my name to the v2 ATU list. ?My QMX+ is being shipped.
Thanks.
73,
Dale Hammer K9NN
dalehammer@...
|
Hello,
?
Has anybody tried this microphone preamp :
?
Evaluation boards can be found for about 5€ looks good to me but I am no expert !
?
73,
?
Yannig - F4IUJ
|
Re: Release of version 1.2 of ABS solution for QMX+ (Automatic internal antenna tuner, internal battery and internal speaker with audio amp)
#ABS
#ATU
#PSU
#QMXplus
Me too! Ordered a qmx+ kit at Dayton.
Thanks
Raj, N2RD
¡ª Sent from my mobile
Rajiv Dewan
rmdewan@...
|
Re: Dreaded dead transmit from SSB Calibration routine
Thats strange that you get 4w+ at 60m??? Reset factory defaults to erase calibration??
|
Re: Dreaded dead transmit from SSB Calibration routine
Ludwig,
Thank you for your reply. Please note my amended post above. I ran Diagnostics in Putty and see the following RF Output:
?
- 60m - 4.3W
- 40m - 0.6W
- 30m - 0.5W
- 20m - 0.2W
- 17m - 0.1W
- 15m - 0.0W
The SMPS appear normal and other conditions on the Diagnostic screen appear normal (unless I'm missing something). I've checked all 1N4007 diodes as well as several others on the board - all check out OK.
?
73,
Robert VE7ZN
|
Re: QMX Microphone capsules in EU
Perhaps you could buy a quantity, get a small discount and share the shipping cost with other hams.
73, Don N2VGU
|
Re: Dreaded dead transmit from SSB Calibration routine
Revision to original post...
?
I just checked again and I'm actually getting about 4W on 60m but then it drops to 350mW on 40, ~100mW on 20m, 75mW on 17m and 0mW on 15m.
?
Help!
73,
Robert VE7ZN
|
Re: Mini Microphones for QMX SSB
hey eric,
I'd like to buy a fully assembled mic.
?
please and thank you.
?
Brett/K5BEZ
K5bez1 (at) Gmail.com
|
Re: QMX short during SSB calibration?
Chris, G5CTH <chris.rowland@...> wrote: One theory is that there is no envelope shaping on the SSB calibrations
and this can generate voltage surges which causes some BS170s to fail.
Hans has said that he will add envelope shaping to the SSB calibrations. This is interesting. QDX has the same transistors in the PA, doesn't have envelope shaping by design, and typically doesn't routinely damage the PA.
|
Re: Dreaded dead transmit from SSB Calibration routine
|
Dreaded dead transmit from SSB Calibration routine
On my mid-band QMX ....I wasn't going to do it. I'd read several horror stories but then, as an "experimental amateur radio station operator" I couldn't help myself. The SSB calibration routine was a disaster. Blew the 2A inline PSU fuse, and took out the BS170s.?
?
I replaced the BS170s with new ones on hand and applied enough heat, visually checked for other damage (none found), then sparked it up. Receives fine and all functions appear to work (Mode, Volume, Step, Band etc). However, when I try to transmit on CW into a dummy load, I'm only seeing about 340mW on 40m and progressively less as I go up in frequency...
?
Any ideas as to where to turn to next would be very much appreciated...
?
73,
Robert VE7ZN
|
Re: I made a protective cover for the QMX+ which also doubles as a stand and storage!
Looks nice; well done! From the photo, have you also added a heatsink?
|
Re: New QMX+ Calibration victim
On Mon, May 19, 2025 at 09:52 PM, Jonas Sanamon wrote:
Guess next is to start checking LPF selection BSS123's and PIN diodes??
Jonas, for this you may use this document from the QRP Labs Wiki.
?
73 Ludwig
|
Richard Dyer
Donald S Brant Jr
B.A. Black