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Hi Andy Whether or not you're right (and fwiw I'm sometimes more than mildly surprised at the technical ideas expressed by people with callsigns) I've noticed over the years that in effect calling

Follow up, the mouser part I ordered does not fit.? It is 1mm too large at the base and shorts out the PCB holes.? Still looking.

Hi Allison.? If only I'd known that as a teenager in the late sixties.? I saved up for an age to buy a 12AT7 when I had a bucketful of 12AU7s from televisions donated by family and neighbours. When

Anyone seen this problem? I am running WSPR on my QDX using WSJT-X and a Raspi. I am running bandhopping (80/40/20m), and set the WSJT-X schedule up ticking the TUNE option for each band I am

Tom, I would affirm Lex's recommendation of the Korad supply.? I got it as a Christmas present from my wife in 2022, and I find it meets all the requirements.? It is also available on Amazon for us

Thanks Hans I still have a QDX enclosure fulfilled with a burnt QDX? now it has a future?

Hi Robert, QMX uses a similar Class D PA. I think same mod should work fine. The only issue is there isn’t much real estate to place pa mod daughter pcb unless we ditch the case. 73 Barb WB2CBA

A good portion of that assembly time will be spent winding toroids, checking the turns count, checking the tap is correctly located, double checking and triple checking, then correcting turns count

Just a quick note. Please, consider that building the QMX kit takes time. Before receiving it, I thought it would take me a couple of hours of work. It ended up taking me about.. 6-8 hours. I'm not a

Hi Barb, Nice work!? I have not looked in detail yet, wondering if you have assessed if your mod would also work in the QMX? 73, Robert, WA2T

Hi Dave, I have it working. I renamed the flight and changed the call sign to ZS6STN (my ARC). I think it was related to using the same call sign and maidenheads. 73 Stewart ZR6WT

Thanks for the info Evan!

Sverre, I did test on high bands. For 17m,15m and 12m no power reduction with standard binocular transformer windings but on 10m there is a reduction in power. If RTWST binocular transformer winding

Nick, I only have a TinySA to test my LPFs with and the rejection but I did get some good plots from this. Usually, Hand builds my designs after send him the info and he checks on his up-market

Hi Ross I'm guessing you've done as much work on this topic as anybody. Do you have any idea of the inherent even-harmonic rejection of the QMX PA. If we knew that then we'd have a better idea of

I do have a 20/17/15 design as well. 73 Ross 6

Multi-band filters involve an interesting design issues when using the existing QMX filter topology. So it's good to see people looking at the alternatives and posting their results. I'm not sure if

? ? Nick and Ryuji, Here’s my SOTA 30/40 LPF design it measures quite well after building 73 Ross Sent from my iPhone 6

Old fashioned fault finding. ignore the windows detection for now. ?and Look at the circuit. See if a resistance measurement across +to- ?(caution. your meter may not be +ve on the red lead.

By increasing the current to 1 A the Qmx turned on for about 10 seconds, it was connected to the PC with win 8 and it was detected, then I smelled a burning smell and I immediately disconnected the