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No, you can't...but you can easily build a substitute with all the parts and methods easily available. And you can build a VFO to handle frequency any time. john AD5YE

If he can't get it working I'd sell my bitx40 board. My setup came with a bad raduino board and I can't replace just that.

Hi Farhan, I'm really glad to see you are working on the next version of the BITX project (good job! :-), but please let me ask how the BITX40 works (Dale - sorry for of topic here). Could you please

You need first to measure the voltages on the board. If you get no current gain by adjusting RV1, then probably you have no gate voltage. Start by connecting your power supply to the board with an

Brian, I reuploaded the Sketch to the BITx40 Radiuno board and replaced the 25mHz crystal and still no workie. ?So that one is going into the junk bin. Wished I could have helped. ?You might

Hi Peter, Thanks for replay! See my comments inline below... Sure. I fully agree. Based on my own experiments I can just confirm: theory is sometimes very far from the practice :-) That's

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