Re: Why no AGC for digital modes, as other modes?
> have found no noticeable performance penalty ....
Would second this request. Elegant solution of the "remove digimodes from mode switch to avoid ear damage" request 2 further up
Factory/default setting would be "off", + a brief mention in the manual.
"Da Wiz", hi. We really owe Hans a lot for his little gems.
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I would be interested in this info too. I have a defective encoder.?
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Maybe digi mode should be selectable from the menu rather than the rotary knob selection? I find it a bit of an irritation that when tuning across a band that i have to cycle through digi mode (at loud volume) just to change from LSB to USB modes.?
Just an idea…
73 Ken g4apb?
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Does anyone happen to know of a manufacturer or US distributor part number for a replacement rotary encoder switch for the QMX?? My left hand (power, band, mode)? rotary encoder switch appears to have failed. I checked the assembly manual for details, but I'm coming up short.
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Re: #qmx plus assembly one LP and Band filter at the time
#qmx
Azgael,
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I would expect it to transmit fine with just the one LPF installed.
Best guess is a bad solder job at T507 or no jumper at JP501.
Perhaps a bad cable from QMX out to the dummy load, or a flakey BNC connection.
You should see zero DC ohms across the dummy load with your DVM when the dummy load
is properly connected to the QMX (due to the ground on the far side of that T507 winding).
Also check the inductors in the LPF, if L511 has a bad connection in the 160m LPF,
then it may not allow much power through but C520 could be sufficient to get
enough signal for a reasonably good receive sweep (swipe?).
?
Jerry, KE7ER
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On Thu, May 22, 2025 at 09:21 AM, Azgael wrote:
Hi Everyone
I was wondering if is possible to assemble only one band filter at the time on a qmx plux rev3, this means I have assembled the all QMX leaving out only the toroids of all the filters, the LP and BP ones.
Now next I have assembled only the 160m LP and BP and test the filters. The swipes look normal on the 160m.
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Next is to test transiting to a dummy load only this band, but I get the swr protection kicking in and no power out. voltages look normal. running a swr plot on 160m shows swr 10 on all graph.
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The main idea is to tune filters one by one with space for the soldering iron making it easy.
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I have reviewed soldering of transformer and swr brigde plus the jumper to the bnc is in place.
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My question is, Is it expectable that the SWR is High when only the filters for one band are on the board or this means something else is already wrong from the beginning.
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Thank you a lot
73 Azgael
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Fred,
AGC is not necessary with the Digi mode because the audio is always at 100%. You don't even need to listen to it since it's encoded ad interpreted by the computer. If you do want to listen to it, then just turn down the earphone volume.?
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73, Dan - W2DLC
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#qmx plus assembly one LP and Band filter at the time
#qmx
Hi Everyone
I was wondering if is possible to assemble only one band filter at the time on a qmx plux rev3, this means I have assembled the all QMX leaving out only the toroids of all the filters, the LP and BP ones.
Now next I have assembled only the 160m LP and BP and test the filters. The swipes look normal on the 160m.
?
Next is to test transiting to a dummy load only this band, but I get the swr protection kicking in and no power out. voltages look normal. running a swr plot on 160m shows swr 10 on all graph.
?
The main idea is to tune filters one by one with space for the soldering iron making it easy.
?
I have reviewed soldering of transformer and swr brigde plus the jumper to the bnc is in place.
?
My question is, Is it expectable that the SWR is High when only the filters for one band are on the board or this means something else is already wrong from the beginning.
?
Thank you a lot
73 Azgael
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Re: SSB Cal problems with QMX (not +)
I'll bump this and see if anyone can help.
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73,
Randy, KS4L?
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Re: Why no AGC for digital modes, as other modes?
By my understanding, DIGITAL mode is a "cheat." Note that is a SINGLE frequency mode -- thus works for FT8 <gasp>, WSPR, etc. that transmit a SINGLE frequency.?
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Thus, all you have to do is SHIFT the transmit frequency -- equivalent to a full modulation SSB SINGLE tone. Note that there is a FSK beacon mode (hiding in plain sight!).?
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So, you are just sending a CW signal -- full carrier, but just shifting the transmit frequency!
?
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Re: Pop! Oops, blew a BS170 in my QMX, my fault. Lesson learned
Ouch!? A QRP antenna tuner is a good investment.? But some alternative suggestions are 1) reduce power supply from 12V to 9V (on a 12V QMX) or 2) use a cheap inline SWR bridge (e.g., ).? The bridge will significantly reduce your output power, but I've been amazed how many FT8 spots I get with the bridge inserted!? Better safe than sorry.
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73, Mike KK7ER
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Re: New QMX - observations and best QSO
Your point 1: Just be aware that some antenna designs do not have ohmic connection between the inner and outer connector of the coax feed line. That means electrostatic charges may build up in unconnected antennas. When connecting antennas to a life rig such charges will discharge through the receiver circuitry and may bleed into the microprocessor. So be aware of this effect, especially on windy days with dry air. You may want to discharge the antenna prior to connecting it to the rig. Connecting the feed line to a dummy load could do this safely.
73 aa0jr
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Hello there, I found something amazing is possible.
We need intelligent friends and we want to speak with them on many different topics. Do you remember that Tamaguchi baby robots need 24 hours of attention ? I found that it's possible to train large language models lot smaller than chat gpt , free , open source and expandable and than load that model in to 90 dollars worth of raspberry pi 5 and add to that chip an oled touch sensitive screen and a ram and than you have a box you can carry around and chat with it?
I am thinking of training and expanding the mini llama llm model 1GB- or a 7GB one with stereophile?magazines - around a 60 years collection - and with some large amateur radio magazines collection , arrl books in 80 years - not all of them , only I can find free pdf - and electronics , physics books. I can reach hundreds of them
But I have two ways to walk. The first one is to translate every book and magazine into Turkish and train the mini llama OR other LLM with 800 000 pages of Turkish and the same amount of English data.
It would take 2 weeks? to translate the data into Turkish and another 72?hours to train the LLAMA or larger model and 72 hours to optimize it with a GPU card.
BUT I found that it's possible to hire a GTX 1080 12 GB GPU WINDOWS 10-11 Computer from Shadow PC company for 29 dollars per month. Computer memory is 256 GB.
Every Turkish or foreign radio or hifi amateur can use this . I will publish all the data free at GITHUB.
Mustafa Umut Sara? Istanbul TA2JCO , 73
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I do not wish to guess why the "problem" with audio levels, or the modes used, but it is my guess that the lack of AGC choices
in certain modes contributes to another's search for a solution.
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Re: QMX+: low RX sensitifity @ 6m / 22 dB noise floor / 1500 Hz wistle
WSJTX waterfall on 6m freq.?
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Re: QMX+: low RX sensitifity @ 6m / 22 dB noise floor / 1500 Hz wistle
Me as well QMX+ on 6m with a dummyload on battery. 
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On Thu, May 22, 2025 at 09:23 AM, Daniel Conklin wrote:
Set the menu to mute at minimum volume, then just turn the volume down.
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73, Dan - W2DLC
The front panel volume control has nothing to do with the USB output level.
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73, Dan - W2DLC
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Set the menu to mute at minimum volume, then just turn the volume down.
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73, Dan - W2DLC
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Re: Introducing QMX CARROT
How do you fit the 4States Group QRP Tuner?inside a QMX+ case? Is it with the QMX+ radio or is it just a different case?
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[OT] - Winkeyer and Ham Radio Deluxe (DM780)
Hello,
Can't find this answer anywhere and this is my last try.
I would like to properly key my transceivers from the computer with a dedicated keyer. So far my K42 worked very well, but it is a standalone solution (no computer).
I would like to know if anybody is using the Opencw Keyer with Ham Radio Deluxe, instead of the golden standard K1EL Winkeyer.
it seems to me that Opencw Keyer does implement Winkeyer protocol version 2, while now the "standard" is 3.0 / 3.1.
I asked to HRD support but they said they only support "original" Winkeyer chip based keyers.
Thanks in advance.
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Giuseppe Marullo
IW2JWW - JN45RQ
PS: I know that my QrpLabs radios do have an internal keyer, just in case...
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QMX+ and DTR/RTS like CW keyering
Hello dear all and devs,
Several hams on our side have equipped themselves with the QMX+.
Some would like to know if it would be possible to add a few lines of code to the firmware so that when PTT is triggered—either via CAT or through DTR/RTS emulation—and the QMX+ is in CW mode, it would transmit a carrier.
From our tests, this already works in Digi mode, where a tone is sent through the sound card emulation.
However, in CW mode, when PTT is sent via CAT, the radio does switch to transmit, but no signal is actually emitted.
It might work if the software sent a tone via the sound card, but most CW software assumes that PTT alone is sufficient.
This request is therefore aligned with improving compatibility with most CW-capable software (e.g., fldigi in CW mode with PTT via CAT or RTS/DTR).
One of the advantages of operating in CW with the QMX+ is also the ability to reduce receive bandwidth, onboard decoding, breakin etc.
We believe only a small firmware adjustment would be needed to have the carrier generated automatically, since the radio already enters transmit mode via CAT PTT.
Adding RTS/DTR handling would enable a simple and widespread configuration method for this kind of operation.
Otherwise, some have considered building interfaces using FT232 chips and optocouplers, but it would be unfortunate to require extra hardware when just a few lines of code might suffice.
Perhaps the addition of a CW submenu to automatically enable the carrier when PTT is activated?
Thank you in advance.
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Daniel Conklin
Randy
Richard Dyer
Roy Ashkenaz