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Hi Michael, Start by checking if the tab (drain) of Q9 switches between 0 and almost the input voltage (12).? Q9 provides the power to the driver and bias stages. If the Q9 drain is not changing,

Also, I don't have voltage to any of the lpf switching diodes.

So I have made some mistake somewhere because I have .9v on the gate of Q9 and that voltage is on the base of the 2n2219s and the gate of Q11 and gate and drain of Q101, the bias adjust can vary this

Hi! More work following the path that Ashhar suggested.? ?I have also bought an older Icom 810H that has full duplex VHF/UHF. I'm doing initial experiments on Windows PC, but I have already

Yes, thank you, the dc point voltages will at least give me an idea of where to look. If I can find out what is happening there, I will move to the rf measurements. Much appreciated!

Yep, now you're going to have to sniff out SIGNALS. Welcome to the world of advanced radio repair (FCC Part 97.1 extraordinaire!) gordon [email protected]> wrote:

Michael, I put together this spreadsheet with voltage measurements of the PA section.? It requires a DMM and an RF probe. Let me know if this helps. 73 Evan AC9TU

So, after replacing the power components of the PA section, and putting in a fresh pair of 510s, I put it all together, all is OK, except, ZERO output... At this point I'm running out of places to

Hi Ted, One thing to remember is the difference in display current requirements.? The V6 is a touch screen with graphics capability, while the V5 is a 16x2 text display. Also, note that the v6

I've been shouted down about using diodes in this way on other forums, but I still thing it is an easy solution to a potential problem, and it has the added advantage of preventing reverse polarity

Hello, Pieter. I'm new to this discussion but not new to the MicroBITX.? I run a version 5 radio on a 16v internal battery bank - two sets of four, with a battery-management board in place.? This

Tom, I've sent you an email.? I'm responding here so other people don't argue with my place in line. Cheers, Harris Butler, NN0Y

That was quick! Gordon

Sold.? Thank you.

May i ask what resolved the low output on 20m what was it before and where is it now. Mine is also sluggish there at 13 watts while 40 is 22 watts. I expect it to be lower but? Thank you -- Patrick

Selling my sBitx V2 serial no. 0251. I assembled it, made a few ft8 and cw contacts, updated to 64-bit, #D printed a cover that allows for connection of mini HDMI cable to PI for extended display.

Absolutely! I definitely am down for a kit. I'll reach out Thurs. I'm glad you caught me on this. I love Farhans ideas, But like you mentioned, it makes no sense to me why you wouldn't go the route of

Well thats the very reason i designed that little gem. It works without gain sag to 54 MHz… and you can short out or open the output 24/7 with no issues other than generating some heat. I gave

The diode solution won’t make any noise either! Those switching systems might make noise!!

Simpler and less efficient was would be to solder some 6A10 rectifier diodes in series till you get the voltage down to what you need. I have used this in the past and it works. I am sure there are