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Hi, I think a good showcase would be if you used an ATU at the BNC output connected to a various loads - antennas. ATUs namely seek for a good match by using an L-shaped network consisting of L and C

Hi hi, nice on John Nice to have a chuckle on an otherwise troublesome afternoon! Yes our "s1.04" labelled chip had the wrong firmware inside it, and after the kicking of several posteriors here, my

Hello Allison I have lots of proper old variable capacitors. I have an antique Soviet era Ukrainian variometer, the kind gift of Ross EX0AA, plus several 3D printed variometers by Ross also... These

Hello Allison Yes, I get that... But as always there's a theoretical hypothesis and a practical realization. We know the high current case is caused by a short and easy to replicate; but is also a

Hans, test load for phase is a quarter wave (electrical) cable with a mixed set of resistive plus capactive or inductive loads. A manual tuner at the end of the wire might also

Marc, Sorry I missed that question. I am using a Windows 11 Op system on a i5 laptop. I also keep the decode on normal. Now to see how I can get more power on the high band rig I just

a 206,886 miles per Watt delight History... I recently built the QCU SigGen to create a GPSDO (Disciplined Oscillator) for a 2023 and 2024 solar eclips project (see my qrz.com page for more info on

Rob and John's hypothesis about oscillation may be right, a resonance could generate massive voltages.? This is different to thinking of an impedance mismatch. It could be far more variable, far

Hans, That would be typical of a reactive load aka R= unknown? and J= something not zero. Usual is high C or?L but the load in all cases is not 50R,j0.? The reason is either case has phase angle

John, Applications such as N1MM and N3FJP’s suite and ?likely others work with the QCX-mini. The CAT commands are mostly a subset of Kenwood TS-440/480, so the main functions are implemented. As

Hello Rob The buck converter topic is I believe, related to QMX and is a different subject. Here we are talking about the QDX finals, SWR protection. Quite possibly everything got mixed, I am not

Rob, I had literally just hit send when your note popped up.? Great minds? 73, John Payne W4CWZ Rob Bleumer wrote on 9/6/2023 7:04 AM: -- Sent from Postbox <https://www.postbox-inc.com>

Hi Hans and all: I am by no means an RF engineer.? That said, and just shooting in the dark, I wonder if, under some set of conditions, a parasitic oscillation could be the culprit?? My thinking is

Hans, I found on the QDX 12 V version a point where, on 40M and a certain impedance of the antenna load the QDX started to oscilate at transmitting. Current went up at oscilating from the normal

hello John, I don't understand if you are looking for an interface to connect the qcx to your PC via cat or if you already have everything and it doesn't work, if it can be useful I am sending you the

Hi Chris I measured voltage in the open load and short-circuit cases, in the case of open load, the current was low. In the case of shorted, the current was high. In neither case was the voltage

One thing I'm wondering about is how can the worst conditions for the transmitter be generated?? Using a passive network of course. Connecting to another transmitter is going too far. People say

I did some disassembly of my failed QMX.? After removing various parts, I still have a short on the Vdd bus of the main board with none of the daughterboards installed.? The one significant part not

Fend Ercin: If both units work fine by themselves, it would seem that the problem is with how you connect them together.? Check that the 1 pulse per second (PPS) and Receive Data (RXD) from the GPS

Dear Hajo There is not, as yet, any equivalent cheat sheet for QMX, compared to QCX. You should find the operation and menu structure quite similar, since QMX inherited (initially at least) it's code