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Just a quick question, I have not yet blown the IRF510 but I found a few IRF520's in my junk drawer. ?Specs look very similar but current handling is much higher. ?I have not analyzed the schematics

Jerry Gaffke- I have uploaded the modified sketch and it works great. I can properly tune a freq without fiddling with it to make it stop flicker fluttering. It works the same as the original except

AndyH- Just incase I didn't say it before, You gotta do this into a dummy load. A mismatched, or high SWR untuned antenna will give you lower readings kinda like the ones you got. If that is the case,

Just thought I would let everyone know that the problem was indeed the Mosfet. I replaced with a new one, did a crude alignment and now I have a working Bitx40. I will need to do a better alignment to

For tuning with an ATU hold the mic to the speaker of your phone or tablet while generating a tone of about 1khz you will get a good steady reading while adjusting the tuner for lowest SWR. You can

James I would recommend first getting it together and make sure it is working the way that it should. Hacks, depends on what you want to do. Look at the tips and mods document in here -

I tune by listening to band noise, and peak. Then tune in a received signal and margin the caps to make sure I'm peaked for max. Usually gets me really close. Larry KB3CUF nd6t_6@...>

Should probably add the two 1N4148 diodes from relay K1 pin 12 to ground to prevent damage to Q13 from a nearby TX. Also should add the 100 pf capacitor across L7 in the output filter to reduce the

I use a noise bridge. I build them into my tuners. No transmit necessary, fast, and polite. Tune by ear. In the dark! de ND6T

Correct me if I'm wrong ... didn't you meant to say " The BFO in the transmitter circuit hetrodynes the audio baseband signal with a 12.0 (approx) MHz BFO signal, giving 12 MHz output DSB. ?Then it

What is the recommended method for tuning an ATU while protecting the IRF 510? At 7 watts? At 20 watts? James

What are the minimum hardware and software hacks that a new user should plan to make upon receipt of the standard product? There are a lot of great ideas out there. What say you? James

As the "Flutter Fix" topic seems to be getting pretty wide, I thought it would be good to focus a little more closely on the version control issue. Here's a sample of the header block I use on my code

It would work. ?And might be ok at 5W QRP power levels. ?If the SSB transmitter perfect and your code practice oscillator has a perfect sine wave with shaped rise and fall times at the edges of the

I think it would be too much trouble for me to add CW unless someone can figure out what Farhan has provided in the code. And just plug a code practice oscillator into the mic jack. Maybe it is

It's working now. It was just that I removed the three tokens at the bottom of that section of code. And Jerry said to remove two, like he has in his snippet, and leave the original one after pasting

One of the things I noticed about my first audio tests, was that I was off frequency. The Raduino needed to be calibrated to offset the zero beat so I wouldn't sound high pitched.? You can easily

A couple of Quid/Bucks for a CB hand microphone, But a DC blocking cap on the mic lead to it from the BITX-40 and away you go .. It couldn't be any problem easier, All this talk of buying boxes and

A very long time ago, as a repeater user, I had a bell systems Trimline handset, and with very minor additions to the old HeahKit HW202 2 meter rig, it (the Trimline) worked as a mic, with DTMF pad.

Yep, as I scrolled down I saw Jack beat me to it. The telephone cord with four wires, and if you're slick you can put in a chassis mount jack. ?You also got a choice of colors and length with phone