Hi?
I found and using this
5/9/12 (15/20(for the PC) if the PD of the Power Bank Supports)
9 and 12 volts are great for the QDX, QMX and QMX+
Buy the one with 5.5 x 2.5mm plug


73 DE muhsin TA1MHS

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Hi
If you connect QCX to GPS,
you can (it will) precisely adjust frequency of the QCX for the TXCO
This was implemented for WSPR on QCX
If you leave the GPS on,
you'll have an atomic clock/frequency standart :)
73 DE muhsin TA1MHS

Did you remember the loop between the bnc and the output from the swr bridge ?

Alan. ?The distinctive feature of the QRP labs device is old style analogue adjustment )as random digital steps don’t play well with some digimodes?

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The data sheet you posted makes no mention …?

On Sat, Apr 5, 2025 at 09:59 PM, <whweb@...> wrote:

Hi Hans, it wasn't that tricky :-)
have a look at /g/QRPLabs/message/142338?p=%2C%2C%2C20%2C0%2C0%2C0%3A%3Arecentpostdate%2Fsticky%2C%2Cqmx+rtc%2C20%2C2%2C0%2C112053543

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:-) WOlfgang OE3WHU

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I was trying out WSPR with my high band QMX with settings as depicted in the instruction manual. I had my QLG2 attached and working with the green light blinking. I had the transmit set to 4 after the hour as in the instructions, and when that time arrived, the rig kicked into transmit mode. All appeared to be going with when the display suddenly changed to read the following: 14,097,140 CW 5 0 On the next line: VK4JAZ QG62 30.

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And there it remained, as if stuck. After a good few minutes I shut it down as nothing appeared to be happening.?

Any ideas what this means?

Actually I thought I read that the QMX+ already used the stm32 RTC output ?

Just to satisfy my curiosity : which TCXO chip comes with the QCX+ TCXO option?

73 - Pierre - FK8IH

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Most all recent USB-C power banks support PD, so it is likely to work.

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I would get a smaller/lighter one.? I have two small 10,000mAh Ankers, and each is good for several hours of QMX operation.?

Just retried a change of tcxo frequency down by 6 Hz. As before it did not work...audio connectivity was lost and had to do a master reset to get it back. Very annoying as have to customise? my rig over again. Yes running the 003 SSB firmware.

There were other weird symptoms but won't "muddy the water" describing those.

de Vk6xt?

I finished assembling my QMX+ (including a battery mod) and finally got the chance to test it.? In the diagnostics everything appears to check out, until I press P.? At that point the SMPS bias current for every band is ~4.6mA (where the PIN forward bias is 30mA).? If I press T (while connected to a dummy load), the RF output and the Transmitter Voltage turn RED, with the Voltage reporting ~9.5-10.0V.? Power is consistently listed as 0.0W, and the SWR (into the 50 Ohm dummy load) is all over the map.

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Any ideas what I did wrong?? I've looked at all of my soldering connections multiple times and don't see any bad joints or bridges.? I've checked everywhere I can think of for continuity, and everything has checked out so far.

Fat fingers did it again…

Accidently turned on the Two Tone Input. ?Changing to Ext Mic fixed my problem!

Sorry for wasting a little bandwidth….

See you QMX SSB!

Mike

Hi Bill,

No not the mic. The QMX+ is transmitting the tone to a nearby receiver. ?Not a feedback issue. ?I cannot hear any voice at all.

Mike

Ah yes, thanks Pierre. Very enlightening.

Mike,

??? When you press PTT, You hear a squeal *FROM THE MIC*???? And yet you're getting good transmissions??? Something about that doesn't make sense to me.

???? Can you explain the issue in more detail?

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Bill

W2EB

East Syracuse, NY

On 4/5/2025 at 7:53 PM, N0MPM via groups.io <n0mpm52@...> wrote:

Hi All,

Upon PPT on the mic sends out a high pitch tone(squealing like a pig in the midwest!)…I am getting good SSB voice transmissions on both my high and low band QMXs’. ?So pretty sure the mic and cable are not the problem. ?

Any others seen this on their QMX+?? ?Any ideas for where to look?

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SSB configurations are the same in all 3 radios..

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thanks

Mike. ?n0mpm

I don't think I can, there's no room for images in this site.

Here are the images, in case someone can coerce it into doing things