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My QMX kit is somewhere between Turkey and the UK so I'm getting prepared...? Has anyone tried or thought it necessary to fit sockets for the BS170s?? Is there space on the board?? It seems to me

? Hi Chris, Whoa! Sounds far fetched but reported DC behaviour on D3 and D6 is inverted logicwise to what I would expect and is definitely the odd one out. Now I notice the same on your original

LIN_REG_EN is connected to a MCU pin through a 100K resistor. It's quite possible the MCU is taking some current even when inactive, this will lower LIN_REG_EN relative to the supply.? I'm sure that

Good morning Hans, I was already impressed by your technical abilities, but this is another powerful example of communication and literary skills! Top! Hans Merz / Pa3AAW

It is a long time since I played with my QCX so I do not remember exactly my solution. Using Windows I had to find a suitable terminal program, or reset something for it to work. If not Putty then

Hi Jerry, I just realized you should get a ? reply to an unrecognized command, not a '. You cant use an RS232 to USB adaptor either, you need a SERIAL to USB adaptor (as in the QLG2...?) 73 Ken

Hi Jerry Yes, QCX has a timeout. You can't type a command in one character at a time at human speed. You need to prepare the command elsewhere, then copy-and-paste it in so that all the characters

Good morning folks and happy Wednesdays... I will put several replies in ONE post. One long post. *Jonathan: * Yes, correct. PD7 is configured push-pull during the boot up. Before it is activated

Jim and Bob, and I’m sure others, I’ve done QDX-Ms for 8m, 8&6m and 6m, I’ll write up all the stuff and post it here. I was considering 4m but I think that’ll be pushing it. 73 Ross EX0AA 6

The statement below about a 20 Percent tol on IP toroids is WRONG.? There is no such generic number. For type -6 material which is the most common material for HF use look at

Sometimes there's a inter-character timeout on the cat. I know the 991 has that...

I suspect that, as Chris alluded to, Hans has PD7 configured in push-pull rather than open collector, so it's sinking the (minimal) current to drop LIN_REG_EN down to 3.3V when the processor is

Actually I just tried it with FLRIG and it has a "Send" function where you type in the string and hit send.? When I did that the QCX returned a single (`).? Also commands like FA; and FA28074000;

Sorry I wasn't clear.? Actually, I was sending the whole command, for example, typing KA; and then hit the enter key but I was getting that ` reply every time I pushed a button on the keyboard,

Jonathan, What you are seeing is the V_IN level when you first push ON or turn ON the Power Supply. This is goes through R101 to the gate of Q101 and LIN_REG_EN. You definitely exceed the 1.7V

/I do remember reading about at least one other person who killed their QMX by toggling their power supply between 6 and 12 volts, in order to toggle their transmit power. This is similar to my own

The N-Channel FET Q101 will conduct ON if the Gate Threshold voltage is nominally 1.7V. That is with +12V, +9V, or +7.5V feeding the 78M33 regulator. This in turn causes Q102 to conduct and the 78M33

I used three different colors of magnet wire so it was easy to figure out what wire went where. -- 73, Dan? NM3A

Lately I am experimenting with FDT86256 mosfet in my design Class E PA rig and am quite happy with it over BS170. Has a higher voltage tolerance and with one mosfet I can get 5

For best thermal contact between the round side of the transistor and the board, I recommend thermal pads ( https://www.amazon.com/thermal-pads/s?k=thermal+pads ) , which will better conform to the