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Allard, now that I’ve updated the latest BitX40 firmware, is there any reason to keep the original Cailbrate switch?

Totally reasonable, totally feasible. You know, if you were carrying it a little distance, like 3 inches (7.6cm) you? could have Pin 2 travel back via a bit of short, RG174 coax, shield grounded

Hi David, Let us know if you plan on trashing the rig. Someone will probably offer to buy it. Thanks Marco - KG5PRT

Yes I've made some local contacts with good reports back. No DX as yet, but had a West Papua (YC9) return my call, but we were unable to complete the QSO. That's 1200 km from my QTH in Darwin,

Phil, Mine had a bad contact at the power connector. Things looked normal but when you tx nothing out! A pull and push of the final power jack solved the problem! Raj

It happens glad its working well now hope you have lots of fun with it chris G0WFH wrote:

Should not be a problem,? to reduce gate inductance related parastics etc you can add a ferrite bead or use trifilar wiring. -- AncelB, MIT EE6002

Thank you all for your helpful suggestions. Now I warned you I was a complete novice and it turns out that I hadn't damaged the rig at all but instead had neglected to reconnect the wire to the PA

Hi Bill, If you install the resistors BEFORE the jack/switch you can hear the sidetone on the speaker, and when you plug in your headset you will hear it your phones. 73 Allard PE1NWL

Hi Raj, I tried the sketch you sent but it would not compile. I have ordered another Raduino. If that doesn't work the whole thing is going in the bin!!! Life is too short. Thanks for your help, David

Try that sketch I sent a link earlier. It displays the pot position on the 2nd line. Raj

I'd recommend not going lower on the caps, but resistor might be OK higher. I run at 51E. measure the voltage going into the regulator (the 7805) - don't let it go lower than 7V. A good raduino should

I'm looking at offboarding the IRF510 on my 20m ver3b board and attaching to a heatsink outside the cabinet. To do that I'd need to extend the leads by about an inch. Would that be feasible or am I

After staring at things for a moment it all makes sense now. Not sure why it didn’t before ? Any idea if different values could be used for the filter? Could I use a higher value resistor and

Are you having trouble with his Australian accent? If not, re-run the video - it's all explained (particularly if you refer also to the hfsigs circuit diagram). His quoting "the DDS" means the Raduino

I've been chasing down some noise problems in my bitx40 kit. For a start, my switching power supply is generating a _ton_ of noise. Using a 12V battery fixes that one. Now, when I plug in the Raduino,

?I'm close to trying John radiomanjwt's quick-and-dirty mods to allow the bitx40 to have some output power on 80 meters.... I just want to confirm that while the 470pf spans the beginning to end of

Going back on 7.285 Ed W0OIC

Thanks I for the help I was about to go blind hunting for these parts on the board pictures worth a thousand words .? I am using a jack with a switch in it to kill speaker when using phones do i

I was called by K6MM a contester, I used my qrp 5 watts to work him, report 4-3.? I cranked it up to 2KW to clear us a frequency on both 7.277 and 7.285 no qrp stations came back to me. Went back to