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¡ªeither via CAT or through DTR/RTS emulation¡ªand 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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I would like to block Digi mode audio from going to the earphone jack. The audio levels are painfully loud when adjusted for correct usb output to WSJT-X. I am afraid to switch between sidebands or to CW without removing headphones first. Any Suggestions ?? QMX+ with 1.02 .
de VK6XT
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Hello Hans,
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Thank you for your help.
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N1MM features the usual contest modes Run and Search and Pounce (S&P).
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In S&P mode? and engaging the RIT on the radio, nothing happens using the CAT Monitor in PuTTY.
In N1MM the frequency can be changed by either using the keyboard up / down keys or the mouse wheel. Tuning withe the up / down keys is not effected.
RIT can be controlled from the radio, no problem.
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In RUN mode and RIT on, the up or down key changes the frequency 10 Hz and no more, irrespective of the RIT tuning step setting.
The CAT monitor receives this: RD00010;? The LCD frequency read-out on the LCD changes from - 0.010 to +0.010 and vica versa.
It looks like the N1MM / QMX+ communication in RUN mode is restricted with RIT on.
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Furthermose, in RUN and RIT on, after using the up / down keys, RIT can not be switched off on the radio. Reverting in N1MM to S&P this works again.
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N1MM has been set for the TS480 protocol.?The N1MM documentation says that RIT is supported on radio's that support RIT in CAT, e.g. the KX3.?
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I hardly use RUN mode as S&P is much more interesting for contesting with QRP.
The QMX+ is a very good CW contest machine, due to the excellent QSK and CW filters.
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Roelof, pa0rdt
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Re: Tune SWR on QMX+ always shows SWR <1.05
Thanks again,
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I resoldered all eight points and now I get proper SWR readings! I didn't find where to measure ADV_REV and ADC_FWD but I now get good readings that match my NanoVNA (at least where the sweet spot is). So problem solved!
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Now I got another idea - to find a way to have the esp32 that controls the motor for the magloop tuner stop excactly at the point where the QMX's SWR measurement is the lowest.
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:)
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Eugene,
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You might want to also consider ordering some TN0110 FETs, a BS170 alternative, to have on hand if you decide you'd like to experiment with a hardier device.
I'd also suggest order a few 5ft. rolls of Solder Wick and a ChipQuik SMD removal kit.
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73 de WD4AH
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Re: Pop! Oops, blew a BS170 in my QMX, my fault. Lesson learned
Lower your SWR protection to "2". If it's a 12-Volt build, run it on 9-Volts for digimodes. Doing those adds a larger margin of error.
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Hi Stan ¡.you said¡
a) Transmit EQ - note that sometimes the 'global gain' here defaults to 20 or some high value, which distorts the tx audio; change it back to 0 (this could be the reason for extreme noise with noise gating off)
That was the problem. My default was set to -20, set this to 0 and now (using the exact attenuator setup for monitor rx that you describe), my audio sounds much better. Now to try on air ?.
Many thanks for your time to describe all this.
73 Ken G4APB
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Re: QMX+: low RX sensitifity @ 6m / 22 dB noise floor / 1500 Hz wistle
Hi Michael,
not sure what ¡®sidebands¡¯ you are asking about. The ¡®spurs¡¯ I see strongly in receive on 6m, 10m and weaker progressively as I go LF in frequency, are every 500Hz, strongest at 1500Hz and 3Khz.
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It would be nice if Hans could confirm if he has seen this on is own rigs or not, to know if we are chasing an inherent problem or it is unique to build our build quality.
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I am a bit sceptical about ¡®cures¡¯ that cause problems to go away (or change characteristics), after resoldering. Surely a joint is either good or not connected.??? (I checked for ¡®dry joints visually during construction), Or there is a short somewhere, but this could cause non functioning, not poorer performance?
I did wonder if it was down to how well the anodised panels of the case electrically bond to each other but they do seem to connect.
interesting observation but WSJT-X successfully decoded a fairly weak station dead on 1500Hz on 6m with a strong spur right on top of it, so maybe not such a big problem as I thought, but can still hear an annoying whistle as I usually monitor the frequency through an amplified loudspeaker.
73 Ken g4apb?
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Re: QMX+ printed assembly manuals
Printing is sometimes useful for highlighting sections. ? Also for Writing notes, menu settings and measured voltages on a schematic for future reference?
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On the other hand using a display lets you zoom into tricky drawings etc and also text search etc?
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So answer on a project is probably both
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- although I¡¯ll try to save an image of the marked up schematic electronically too?
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Re: QMX+: low RX sensitifity @ 6m / 22 dB noise floor / 1500 Hz wistle
Hello Ken
Have same issue.
Could detect LO signal (RX -12kHz,-40dBm) and additional sidebands at 6 m and 10 m at BNC (RX).see also my Posts. Another OM also detected these Signals.
Resoldering trifilar sidebands at 6m and 10 m have gone, but weak 1500Hz Tone remains(-120dBm)
Noise floor reduces from 25 dB to 6dB @6m.
@12m Noise floor and digital signals enlarge. But QSO is possible.
Can you verify sidebands @6m and 10m?
I try to document my measurents and suggestions.
Vy 73 Michael
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Stan, many thanks for that, I will try your suggestions. Before you replied I tried an interesting experiment, in case the problem was with my microphone... I set up my QMX+ for WSPR transmissions the same way I do for my SSB HF rig - i.e set MIC INPUT to USB and SSB mode instead of DIGI. Then set my PC WSPR to use SSB (Upper Sideband) mode and set the drive levels to not overdrive the QMX USB input.? I ran WSPR band hopping on all bands (Tx 100%). The result was no decodes by other stations. I normally would get 100's of spots on mu U3S 200mW, so something is clearly wrong, nothing to do with my own monitor setup. I shall continue.
I tried the noise gate in single steps right down to 1 but the low audio level chopping still persisted with the mic input. Hopefully your suggestions will isolate another problem. I don't have EQ turned on nor Compression at the moment. My SSB cal went all through with no problems, but I wondered if it can be turned of without a full reset? I took about an hour to run through so I am a bit reluctant to do a reset. Hans says the SSB should work OK without the SSB Cal.
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thanks for your time to assist.
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73 Ken G$APB
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Yes, all terminals of T507 are at DC ground.? The inductors allow the RF signal to pass, and generate the FWD and RVS signal detection for power and SWR calculations.
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I redid my windings as you suggested and they came out better.? Not perfect but better.
After soldering in place, when I checked the connections with a DC meter on ohms everything seemed to be very low resistance and very close to the same readings.? I've looked at the circuit diagram and can see that it is basically a few short lengths of wire more or less connected to one another and ground so I want to convince myself everything is OK.? But ....
Is this normal?
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Good idea to have spare 74ACT08's if you plan to blow the BS170's.
When the BS170's fuse up internally I'd guess the 74ACT08 gate drivers might see 12v, at least for a moment.
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Look on Mouser or Digikey for anything that claims to be a 74ACT08D, and then get the cheapest one.
The D means it's in an SOIC8 form factor, anything else won't fit on the board.
Any additional stuff after the D says how it gets packaged at the factory, and what kind of metal the leads are plated with.
You can verify this on page 11 of the datasheet where part markings are decoded for you:
This is the one I'd get off of Digikey: ?
In small quantities it arrives as "Cut Tape", because Digikey cuts a bit of tape off of a reel of 2500 parts.
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The TI32A35SM that codeleaf reports is probably something like a lot number.
My QMX+ also has IC503 marked as "ACT08", that other gibberish says "TI43A5SRM".
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Jerry, KE7ER
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On Wed, May 21, 2025 at 08:02 PM, <codeleaf@...> wrote:
The IC503 likes to fail along with the BS170's. No part numbers unfortunately.
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Schematic shows IC 503 is a 74ACT08D but chip is marked TI32A35SM ACT08 which I cannot find a spec sheet on.
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Richard Dyer
Daniel Conklin
Roy Ashkenaz
Bruce Akhurst