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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

Those are all good reasons the LTM8078 won't be the best choice for this particular application, I really just picked it by going on the Analog Devices web site and filtering for a dual-output

Wayne, As Tony AD0VC pointed out, the commutating diode across L14 is definitely a good idea regardless of which FET you use. The TN0106 produces a much higher spike voltage than the BS170 because

This is interesting, Tony. I'm gonna have to study the schematic to determine the direction of the diode. I think I read of this solution in another post. For now...I live in the far SE corner of GA,

My apologies to the group. I called out the wrong transistor - I meant to spec the TN0106 as a good replacement for the BS170. Thanks Tony for refreshing my memory, it’s been months since John Z and

Hi! I received my QMX today, assembled it, and flashed latest firmware (1_00_009). I didn't test it on air yet (only with a dummy load). I have several issues with it. Two are serious, other are

I ran a TN0106 in my high band QDX for several months and had no issues. I had better output on 10 meters than with the BS170 but nothing dramatically better. I also ran the VN0606 in my low band unit

Lead shape and/or packaging. Mike WM4B Sent: Tuesday, August 29, 2023 7:04 PM To: [email protected] Subject: Re: [QRPLabs] BS170 Fail Thank you. Does anyone know if there is a real