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If my memory is correct, yes. Make sure you have scraped/sanded and tinned all the magnet wire before installation. Use sufficient heat, with a large tip. .rr

A mistake on my query - this refers to the QMX NOT the QMX+. Question then: can the transmit delay be adjusted ?? 73, Jamie WB4YDL

Hi va3rr, Thanks for your response. So it looks like in your picture the top left toroid of the 6 inductors I can see the final tun goes through the center through hole. Is this the case for all of

It is very strange. As I said when I used Vara sound card settings where QMX was mentioned as output/input device TX power was very low. Than I decided to choose mic and dynamics as input and output

Each turn thru the toroid hole counts as a turn. The toroids must be wound in the direction shown in the manual. Here's some pics of my mid-band QMX. GL de

Brien: Thanks so much for this. I suspected this was the case. I actually jumpered the diode at the relay in the amp to put in transmit mode, and the QMX+ worked perfectly fine. I need to upgrade the

If you are using COR function with the amp this will happen as the QMX sees a high SWR while the relays are switching over.? ?If you can use PTT input into the amp and set a TX delay of about 15mS

Hi All, I'm very new to building kits, and radios in general. Working though my 60-15m QMX and I am at step 2.12 where I am winding and attaching L511, L506, L512, L508, L513, and L510 and I wanted

Thank you Hans! Yes, I tried to use DiGi by mistake )) Now I tried USB and there is strange thing: it works, but TX power is very low. Peak to Peak voltage is just 3 Volts. When I work in other

I recently built the WA3TFS linear amplifier featured in the March QST. The build went very well and with my old MFJ 20M QRP CW radio, 3W in gives 20W out with a peak 4A draw. So, I tried to interface

Good info! I just ordered two.

Hi les, That is the same mic, (I have 4 of them), I use on all of my Bitxs and my QMX+. I always get good audio reports. I know they are not the most attractive looking mics around but they do

Jack, As far as current draw for these small single board computers like the various models of Raspberry Pi, the published values are probably maximum values. These might only occur as transients or

I recently purchased this microphone kit from Pacific Antennas https://www.qrpkits.com/microphone.html for $15.? The kit was easy to build and seems to work ok with the QMX+ usng a MIC Gain set at

Ludwig and Stan, Thank you both for your reply. I went ahead and checked the resistance for all the pins related to the two SMPS boards and there only appears to be one point of note. When testing

Hello Petrov I'm successfully using QMX+ with the WinLink Pat client on a Pi400 computer with ardopcf as the modem. I have not tried VARA. I don't have any Windows machines here and though I hear

Hello! I am trying to find right settings to start work with WinLink and VARA HF threw QMX. CAT connection is OK. The only problem here is that when I choose some Gateway channel QMX always switches

Hi Barb I'm not sure you're comparing like with like. The capacitances of the FDT86256 are quoted at vDS = 75 V, whereas those in the BS170 datasheet are quoted at vDS = 10 V. Everything in these

SORRY, Life got in the way. I had to change the time. It is now 15:00 EDT / 19:00 UTC Ed AB8DF

Brent, in this case gate capacitance is not the issue as 2xBS170 parallel and one FDT86256 has almost equal capacitance. The problem is gate driving voltage is low. -- 73, Barb