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The clock on my QMXplus seems to drift many minutes every day. When I do an operating session or a POTA activation I will need to remember to set the clock when I sit down and power it up. I set the time to UTC to make paper logging easier. I have a new quality CR2032 battery in my QMXplus in case you wondered. i haven’t yet measured the clock drift, but was surprised it was significant. I think a number of contacts I uploaded to LoTW had no QSL because my estimate of the correct time was wrong. (A day or two later I discovered the time was way off before I uploaded, and changed the times in my electronic log to my estimated corrected time) Or I could get the OLG3 GNSS module which I think will set the QMXplus time, but that requires another component and setup to my portable kit. I probably won’t bother but keep thinking about other solutions. My Home QTH transceivers are spot on the correct UTC time. I can take a PC or IPad and do my logging on it. Another component to take. Q: Before I decide what to do, How much does your QMXplus clock drift?

At Hamvention last week, I found an unbuilt CMX, #345 at a nice discount with case, board is REV 1. No markings to indicate low band, mid band or high band. Is it likely low band? Thanks, Mark W4ZIP

We had four folks join the MI QRP Zoom Chat on 15 May. Please join us Thursday, May 22 (and every Thursday) at 4PM Eastern for the Michigan QRP Club weekly QRP Chat where the main topics will be QRP and other ham interests. New hams are encouraged to participate and ask questions. It's fun, it's easy, and it's free. You only need a computer, a smart phone, or a tablet that can connect to the Internet. OR if you can't be close to any of those you can join by audio with any standard phone. Just follow the directions below. No software needs to be loaded or installed. Anyone can join and non members are welcome. Details are here: https://www.miqrp.net/zoom Zoom ID: 811 0835 6229 We had 3 check ins today. Stan, Casey and - they talked mostly about satellites. I listened and did paint touch up in my radio room as I disassembled it. Have Fun and don’t forget to visit U.S. Tower booth if they have one. Pete WK8S Stan WB8QJZ Casey KC9IH Tom WW8AL They talked mostly about satellites. The topic for Thursday, 22 May will be FDIM, Michigan Mighty Mite Revival and Hamvention. The agenda for the 22 May QRP Chat: Ernie to do a short introduction and acknowledge any new folks to the Zoom chat. The topic for next May 22 will be FDIM, Michigan Mighty Mite Revival and Hamvention. During the open forum anyone can take the floor. We will go one by one until all have had a chance to have the floor. Files, pictures and presentations can be shared if you have any. Please try to stay muted when someone has the floor. Thanks Ed AB8DF

I have a QMX coming soon and was wondering now that SSB is included, do you think the QMX would perform well in a mobile environment? Perhaps with a amplifier/tuner? TY! Jeff

Ok ..I have tried fldigi on other radios - always gave up after too much trying to make it work. So trying one last time with QMX+. Is there a simple "HOW- TO" for getting to work ? I want to use it for RTTY mainly . So far no fun...?thanks

With the help of this group, I was to implement PTT-keying of my WA3TFS amplifier. Thanks to all who helped, that worked out very well. WA3TFS states that the 20M version can also be used on 30M and 17M. I have noted a significant power drop-off on 17M which I attribute to roll-off of the WA3TFS LPF and avoid that. Additionally, it would be nice if the amplifier was as band agile as my mid-band QMX. Then I saw the recent thread about the QRP Labs LPF relay board which got me to thinking about using that to make those improvements. The QRP Labs relay kit with band-specific filters for 40M (and 60M), 30M, 20M, 17M and 15M should improve the WA3TFS greatly. I plan to bypass the WA3TFS LPF and just use the five filters on the QRP-Labs relay board. Since the relays handle the amplified RF path and are activated using +5V, I was planning to use a band switch to activate the appropriate relay. I realize that this manual approach increases the risk of operator error and high SWR if the amplifier is not switched to match the QMX band. Has anyone done this with the WA3TFS amplifier or similar? I am a novice at this, so is there anything that I am overlooking in thinking that this would work (for example, impedance matching between WA3TFS PA and QRP Labs LPF)? -- 73, Jim - AE5JE

Recently, I observed some strange QMX behaviour. I returned from SOTA, all was OK, and I stored QMX to the drawer. After some time I took it from the drawer and upgraded firmware to 1_02_000. I wanted to do SSB calibration, but I checked SWR first and I observed that SWR sweeps were very noisy and were varying from SWR 2.0 to cca. 10.0 even when on dummy load. LPF sweeps also showed some strange curves with 0 dB on the both min/max. I deduced there is no power output from the QMX and the diagnostic tools are reading only noise (IMHO it could show error message in such case). I validated with the external wattmeter that there is no power output from the QMX. I opened the case, finals were OK, filters connections also looked good. Firmware downgrade to 1_00_027 didn't help. Power off/on cycle and unplug from the power supply also didn't help. Finally, I tried factory reset and viola then it started to function normally and outputs power. Does anybody experience anything similar? This behavior was quite unexpected to me.

Has anyone tried 80-15? LPF0: 80m LPF1: 40m LPF2: 20m, 17m, 15m BPF0: 80m BPF1: 40m BPF2: 20m BPF3: 17m, 15m 73, Robert VE7ZN

Hi all, just some hints how to configure QMX and Digipan. QMX: - SSB Menue: Mic AGC ON; Input: USB; MIC Gain 50; Compression 0 USB Gain: Adjust for 50% power on idle PSK Signal. (I am using USB Gain 5) - VOX: ON - CESSB: ON Make sure your antenna SWR is ok. If "Protection" is on it might stop your TX. (Its not the fault of Digipan, hi) DIGIPAN: Set your Serial port (where QMX is connected), no RTS/DTR as we are using VOX. Soundcard: Type: "Computer soundcard"; Input/ Output: "digital interface QMX"; sample rate: 11025 Thats it. Ready to make first PSK contacts! Good DX and hope to work you in PSK. 73 Mat DF2OF

Need a sanity check here: Just built and installed T507 and as I was checking continuity between A-A, B-B, etc. I noticed that every pin would show continuity between each other (A shorts to BCD, B shorts to ACD, etc). Looking at the traces in the instructions and my limited understanding of the schematic, this is nominal and all 4 wires should connect to ground either directly or indirectly. is that correct?

I have a question about the LU7AA picoballoon tracking website. In both the first and second transmission there is a header listing for: Rgrid, Km, Az. In the first transmission I assume they relate to the reporter of that spot My confusion is what do they refer to in the 2nd transmission. I posted in the "picoballoon" website with no response. Is there a guide to LU7AA website by any chance? Thank you for any help Tom K1FQY

Pleading ignorance, please tell me where to find how to use one of these things. What does it fit in what other device? Is tthis part of a WSPR beacon? -- 73 Karl KI4ZUQ

I built the K6ARK mic per the specs listed for the QMX/(tr)uSDX etc including using the recommended high sensitivity (-24db) electret condenser and the mic works fine when transmitting on my (tr)uSDX however when transmitting on the QMX I'm getting an unintelligible signal. I have ran the mic gain utility via terminal which shows the correct levels, however upon transmit on my factory assembled QMX I still can't seem to get satisfactory transmit audio. I've also tried a factory reset. Any ideas? TIA de W?YEM

Hi what is the PC software that I need to use to get into the QMX settings etc. I can access on the QMX screen but I see other people's screen shots of a PC Version. Many thanks ? ?