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My first concern: Getting some of the good authentic and correct parts at a reasonable price or suitable substitute is my initial concern. In particular the MAV11, ADE-1 and the correct version of the

Hi, thanks for reporting the trial of my muggested circuit and? the positive results 73 Gian I7SWX

After whatever went on with the first Bitx40 that I was shipped and especially after it appeared that the Radrino got whacked during troubleshooting when I switched from 12v to 13.8v I'm exclusively

I just put the stock mic back for now until I find something I like. I honestly just don't have anymore room in the case for that kind of add-on. If I went with smt it would cost me more to order the

What are the values of C4, R7, C8, R9?

You have to figure out if really the PA is blown. One way is to find out if the bias pot can increase the PA current from 0 to the required 100ma. if that works, i would look for charred resistors

I just found them on Ebay you might look at?172308533782 this is the seller I used. the9ARZy come all together?and you just snap off what you want to use. Jeff N

Amen Dr Fred. Stopping the leak is of great concern. Wound contamination is way down the list. I am personally grateful for the fancy new hemostatic bandages and tourniquet, along with the medics who

Thanks everyone who replied. ?I don't use the electret mic I use an old turner super sidekick and I replaced the cap with 1000000 uf in series not parallel as stated on hfsigs and I got a good audio

No argument here. I owe you a beer and more should we ever meet, whatever war that was. I was lucky enough to come of age at the end of the Vietnam War (the American War to some),? right about when

Having been on the receiving end of a “War lead bullet”, I can assure you lead contamination was my very last worry. Repairing the hole was of much greater concern. v/r Fred W4JLE Sent:

Installed! I feel like it works much better!? Thank you

All of those assertions are demonstrably false, but this is not the forum for that. jgaffke@...> wrote: -- Andrew Krause General Class Amateur Radio License: KM4ZJO PGP Public Key

Heat, overvoltage, overcurrent, and in pa's high vswr / mismatching are deadly enemies of semiconductors

Yup. As Allison notes, a primary issue with the IRF510 as an RF amp is heat transfer from die to tab. It was designed to turn on blinkers for an automobile, which cycle at around 1hz and spend very

Allison KB1GMX wrote... The IRF510 is cheap to replace. I'm starting to think that perhaps I should just stick with it! Perhaps I just got unlucky with the first one. I was in a QSO that was

If you want a low level carrier to tune with, a slight modification to the CW mod will do it. The CW mod I'm referring to is the 10k resistor from C107 to +5. Put a 100k pot in series with it and

There has been a problem, the transmit out (let's say on 14 MHz) would find it's way into the seccond mixer (the one that mixes 12 MHz up to 45 MHz). As second local oscillator was t 57 MHz. While the

Arv K7HKL wrote... You are right. Compared to the number of BITXs out there, the number of people with failed IRF510s is quite small. The day before mine failed, I was using a non-ideal length of

A billion cars burning roughly 1000 gallons/yr is an awful lot of CO2 even if it is relatively benign (it is not: ?https://xkcd.com/1732/ ( https://xkcd.com/1732/ ) ). ?And more than a little