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Between the power supply and the capacitors that Arv K7HKL recommends you might also construct a common-mode choke from a junk box powdered iron toroid you might have (T-37 or T-50 material best) and

Rob N3DSY Add a large capacitor (470 to 4700 mfd) across the DC output and any of them should be acceptable. Might also add a 0.005 across that larger capacitor to insure that higher frequency

I have a few orphaned laptop power supplies in the junk box- would one of these be 'clean' enough to use for this radio? -- N3DSY - Rob

I'm curious why you replaced the Microphone's electret 'capsule' with the one provided in the kit? Aren't these mic's all electret anyway? I've bought a couple of these on eBay - one for an ACTUAL

Howard: I wrote the assembly manual for 24 members of my club who have already built the kit. About 5 of those had never built anything before, so I feel that the board and the code are stable.

Hi all, although not a new subject, now that there are many more users, I'm hoping to get some direction to fix the problem. My friend had his Bitx working but added a speaker and accidently hit the

Hi Jack, Forgive me, but as a newbe to the group, I’m still playing catch up with the BITX project and your own MAR-35M and display board. I did go to the QRPGuys and look at the analyzer

I forgot to say that, if anyone is wondering if they have similar issues a quick check is to measure the input SWR with the filter terminated in 50 Ohms. Simulation (and measurement) shows that the

To complete the story .... I removed 1 turn from each of the 20m and 12m inductors - the responses are now satisfactory. For the record, the 20m -3dB frequency moved from 15.00MHz to 15.61MHz, and

I think there are a number of people who have done this. Go to the home web site Files section and search "Purdum" for two articles on implementing rotary encoders. That discusses using them in

It is possible to cover the whole 40m band using a multi-turn pot. The only thing you need to do is to increase the step size from 1,000 to 10,000. This is easily done with 100x oversampling. A small

It does key up when the PTT is pressed. ? I wanted to use a microphone that was pretty much prebuilt, and would allow for the BITX condenser. ? I have yet to make a contact on it, because I don't

Of course possible by new software. Farhan has intended innovation of multiple parameters like slow fast , and auto tune facilities in one single pot. if some of us feel it as a trouble , we can

Try looking at this thread: /g/BITX20/message/23634 Marco - KG5PRT

You obviously haven’t been following the posts. Sent: Saturday, March 18, 2017 11:21 PM To: [email protected] Subject: [BITX20] Rotary encoder in place of pot i intend to use rotary

i intend to use rotary encoder in place of pot in raduino. Is it possible to implement? Anyone tried this?

I got my Bitx wired up today on my bench and it all appears to work. I have about 5 watts out on my watt-meter into a dummy load. It draws about 1.5 amps at 13.8 volts during transmit. I was surprised

Dale, I optimised the design further. Reducing the relays to just three. I added another cyrstal too as it really makes a difference. There should be a 4.7k resistor in series with the AGC diode too.

Larry, By the two cross connected wires going to the middle of the board, I presume you are talking about the DDS. I'm an old Navy Chief and firmly believe you get what you inspect, not what you

That's where I put my 5ah, agm deep cycle battery. I added a charging port to the rear and a switched voltmeter to the front. Fun stuff Sent from Mike's iPad WA1MAD