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I don't have my bitx yet, but I'm going to try to listen for you guys. Curious how you'll sound on the air. I'm in Wisconsin. Mark KC9DZT BITX20@...> wrote: -- Mark

Hello All: I have some of the development boards with the Si5351A similar to the Adafruit units. These have a direct interface to the Si5351A in the I2C format. I have a USB to I2C adapter that

I will be monitoring the QRP 40 meter frequency 7.285 MHz tonight from about 6:30 pm local (Eastern). Hope to make some contacts with other BITX. I think that the earlier time will work better for

Just to keep youir options open, let me describe what I did with a Radio Shack CB mic. I desolders all of the connections to the push-to-talk switch, measured the terminals for closed when pushed, and

Careful adjusting the drive strength as it is meant to be into a 50 ohm load. Using the buffer sometimes decreases the output due to mismatch. Only way to tell is to measure it with a scope. In my

I was thinking that Q7-9 may be distorting the signal, creating more noise and raising the noise floor. I know that diode mixers require 7 dbm drive. But I will put in the filter before the

Ken, this is the third Si5351 VFO I have built and I left them all at 8ma, and doesn't appear to be over driving the mixer. Remember, it's a passive diode mixer which requires more drive anyway

I made successfull QSO with dds vfo. I add a 9850 based vfo plus a 2 x 2n2222 buffer amplifier to increase dds output signal. I connect the vfo to external input pin of bitx 40, before I removed

To Joel Thanks for the filter link. Also interested in the analyzer on this link To All Currently I have the drive strength set to 8ma for the SI5351. Since it's being amplified/buffered by Q7-Q9,

Hi! Interesting Miguel. Your 12Mhz 3khz filter in the second link looks good for present BITX40- V3 radios. We can try playing around with the emitter bypass resistor value reducing it to 5.6E to

To modify the ladder filter for other band pass or to correct the shape or to measure the band pass check my web page those links (they are in portuguese) How to make a ladder filter with simple

Joel, Some guys used good 'Q' varacter in ladder filter for variable bandwidth... MV2109 or 1SV148 ? 'Repair & Reuse or Recycle E-Waste'

I got some time last night to build it into an enclosure. I set up this morning with a telescoping whip antenna in Los Gatos, CA while waiting for a parade to get going. C111 is replaced with a

Haven't actually mounted it in yet, but the BK1068 plastic wicker storage box (bought from a local discount store for $2) just fits the BitX40 board. There's also about 2 or 3cm clearance at the end.

Thanks Joel, I had planned to use the ones for a 60meter low pass filter at http://www.qrp-labs.com/images/lpfkit/instructions2a.pdf http://www.qrp-labs.com/images/lpfkit/instructions2a.pdf

it is 2.2khz BITX20@...> wrote:

To Joel Caulkins, ( KB6QVI ) ???? Thanks appreciate the fast responsed. BRRicardo R. ?

Asher, What is the present bandwidth with the 100pf. I don't mind it at all. Joel Caulkins KB6QVI

you can open up the filter bandwidth. replace the 100pf caps with 68pf. that should put it to a 3khz wide bandwidth. you can keep playing around with those caps. - f BITX20@...> wrote:

What a pain. Just follow the link. Joel KB6QVI