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Yeah, precisely because an attenuator attenuates in both directions makes it unsuitable for this use case.

Greetings Anders, I cannot address the math here but can say that the Ten-Tec Pegasus, Jupiter, Argonaut V and 6N2, all of which I owned used Weaver method detection in the DSP section of the

Jan, First I would check the dummy load with a digital ohm meter. Is it actually 50 ohms? Next double check whatever cable or jumper you are using to attach the QMX to the dummy load. Check for shorts

Hi Mike It's already on my list, to provide a way to reduce QMX output power. And in the end it the aim is that EVERYTHING that you can set on the QMX itself, or in the terminal, should be

Hello Hans The 6996 kHz signal mixed with 7008 kHz will appear as -12 kHz (note the sign) and 14004 kHz (removed in analog LP filter) at the ADC. Mixing it with the 12 kHz IF results in -24 kHz,

Hello Stojan I have seen this issue before, where everything works normally at 12V but when the supply voltage is reduced, it stops working. I recall that it was due to a knocked off component on one

Please add me to the group buy list for ABS for QMX+ v1.2. Thank you. Bill Strand AG5ZN wrstrand@...

No problem Peter! Consider it done 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl [email protected]> wrote:

Kevin, I presume this is with a dummy load? I do not have a QMX but are you just seeing the filter bandwidth? No, but are they so noticeable with an antenna? Spurii are often present but ~700Hz is

As Jason pointed out, L503 needs to be replaced. ?I always add an SMD protection diode across Q508. ?Much neater and easier. I also see a few questionable solder joints where you can see the copper

15m CW - other bands are similar but with lower volume on the 600-750Hz tone range 15m Digi showing 4 tones at 700, 1400, 2100, 2800Hz. Can anyone suggest what I can do to get rid of the wideband

Hello Ludwig and Randy, QMX+ rev 1: Q507 and the BS170's are replaced. Q507 and one BS170 was broken. Still the same problem: No output. Now I have an oscilloscope so I can proceed with the tests

Hello Anders

The bottom diode, smd one, looks as though you have broken off the pad that your larger diode is connected to. This diode is no longer making a connection and likely needs to

Great, thanks!

No issues with this, Bruce.? I can see that the wire is still intact.? The broken top doesn't affect the performance.

Hi everyone, I have fixed this issue! It ended up being an incomplete solder connection at t501. I added some solder to the top of the board at this transformer and I have my on-screen s-meter, swr,

Hello QRPers, I'm having an issue with a new midband QMX (which is likely my fault!). I have no output power showing in my diagnostic screen after doing some testing with a a 20W QRPlabs dummy load.

Hi Bruce, This is a fairly common issue. I've had a few kits arrive with exactly the same damage. If the wires are intact and connected to the board, it should be OK. - Bill? W3WJ

Curt, Thanks. No, there’s no continuity. Mike