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Personally, I was planning on having my Pi/HAT and Bitx/uBitX in separate shielded boxes in the same enclosure.? It might be necessary to put the Si5351 and ADC inside the Bitx/uBitX box and use

... Allard's method is much easier and likely cleaner. Jerry, KE7ER Absolutely, Jerry. Only one thought: Key-clicks. It's being driven from D6, digital on-off. Is that 10k and C107 enough R-C and

Yep, a RORT!

I had the same, but if you read carefully, there is no duty. In my case it was appx $7 for HST, and the rest was "administration" fees for the carrier. -- *** mike.ligeza@... VE3UIL Smiths

Before you try it on the air, add R904,R905,R906 and C904,C905,C906 from Farhan's minima: ? ??https://www.freelists.org/archives/minima/01-2016/pdfavh3bHrUb6.pdf (

Search "audio sine oscillator". There's a 2-transistor (one is an output buffer) Wien Bridge circuit there. I'd recommend keying that buffer's power (or the whole thing) with a resistor to reservoir

?Unbalancing the mixer so that it actually produces an OUTPUT signal which actually is the carrier, seems pretty much the idea of CW to me. However, I did some research recently to figure out if the

I thought CW was turning the TX on for dits and dahs and off otherwise, basically an unmodulated carrier at a given frequency. Is it common to use a modulated carrier, where the audio of code is sent

Well, I went ahead and ordered one anyway. I guess I’ll give it a try and see what happens. 73 Ben KD2NOU [email protected]> wrote: Ben KD2NOU

On closer inspection they have an LM555 timer IC, not a uC. But output is still a square wave, not suitable.

simple enough to have a $30 Raspberry in the same enclosure if you wish, and that wouldn't require a bunch of software development. I compiled a release of FLDIGI for my Raspberry. There are 5" and 7"

It can work, it's been done. ? The archives of this forum show that most attempts at CW on a Bitx have done something similar. But Allard's CW mod is very simple and will give a cleaner CW signal. I

I got 2 speakers from Goldmine or somewhere like that. They are "Golden Voice".? I realized 16 ohms would be better liked by the LM386. I think they are a lot more efficient than the 2" I was using?

Reducing R111 to 10 ohms sounds good, that audio power amp can require significant current. Mike's cap from LM386-7 to ground is also a good idea,the LM386 datasheet recommends a 10uF cap there

My BitX has Ubitx modules but arranged like the current 40 meter version. I’m using a QRP Labs vfo and a relay switched crystal bfo/carrier osc for USB/LSB. So far 80, 40, & 20 have plenty of audio,

I have a small step-up that produces a manageable hiss on transmit - It's noticeable, but not terrible. ?I'll see if I can find info on it when I get home from work. If you have more than one 12v

Thanks Raj, I will check the final bias setting, 73, Karl

Hi, All is ok , but when You use more than 5W RF power Your RPi will be freeze USB ports from reflected RF wave (and no only USB ports). I have bad experience with RPi for ham application and put my

If the tone is a clean sine wave and not over driven the CW will be perfect! Raj

Hi Allard, Thanks for the info.? The software now works. No I have to try and work out the weird tuning system! Regards, David