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I use a 555 timer with RC filters in an altoids tin to produce a 1khz 100mv p-p signal into the mike connector. It works quite well on another rig and I'll try it on the Bitx40. More than likely won't

Look for "BITX20 F8VOA" on page 1. Also "BITX40 py0ohh" on page 2. john AD5YE

I've looked for the "F8VOA folder in the "Files" section and don't see it?

Thanks Marc. I figured you and Miguel would be the first to commend and recommend that she has to say. Ladies and gentlemen, if you want to see what has been accomplished by "noodling" about the BITX

For a broadband transformer, ferrite is better than powdered iron, though both will work in one band. You can use a FT-37-43 or FT-37-61 equally well. For 40m, I should think a T-30-2 or T-37-2 (red)

Just a couple of bits plus Allisons suggestions although this applies more to the homebrew variety. Tips n Mods ( /g/BITX20/files/1%20docs%20of%20Tips%20n%20Mods ) -- Rob G4NQX

my BITX-40 damaged T4 core is black, so I thought it was FT37-43, the diameter is the same, but the damaged is about 1mm thicker than FT37-43 .... anyway i will try to do T4 on ?FT37-43 .... thanks

That's a broadband transformer. ?Either core should work fine, and they likely use what they got.

Moving from the Schottky Bat54s back to the two non-schottky 1n4148's would require more drive, not less. ? Near as I can tell, those Bat54s diodes were a problem for W5KUB and for nobody else.

Arv's post says to use a T37-6, but both of mine came with T30-6 cores as seen in the picture. The core on the left is a T37-6 and the core on the right is the one shipped with my BitX40 board. Joel

Hi Tom, It's a T30-6 yellow powdered core. Joel KB6QVI

Check out Arv's post: ? /g/BITX20/message/19167

If the purpose is to create a carrier for tuning purposes, a much easier to implement solution may be the generation of an audio tone with the Nano, injecting it into the mike input. For really picky

Hello, I renew my question in another thread about what the core is the transformer T4. Unfortunately, my BITX40 came damaged T4 was lying horizontally and detached 2 wires, I suspect damage to the

Thanks for posting Allison's info over here Jack. Based on this info and the other thread on this message board I tried the 19MHz VFO approach yesterday. I can report that it was very effective.?For

So, what does this mean to the rest of us? "The mixers using 1N914/4148 diodes are not level 7 mixers (nominal 7dbm drive) like commercial DBMs. the reason for this is Schottky diodes have a lower

Yup. ?When operating the VFO down around 5mhz we get images of SW Broadcasters from the 4'th harmonic of the vfo, as first explained by PA4Q in post 21996. ?As you suggest, 7.2mhz gets received

Using the digital chip for the bfo sounds like the answer but I know nothing about programming the Arduino and the digital chip so I'll have to wait until someone smarter decides to tackle it! :-))

Will work fine if you move the BFO a khz over into the crystal filter passband. ?Trivial if the BFO is driven from a second channel of the Si5351, and gives us a better option for USB/LSB switching

The likely problem is interaction between the BFO and the LO causing a result at 7.2 when tuned to 7.2. I used a SI70 and a crystal osc based on a spare crystal from builidng the filter for the BFO so