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A buddy bought a SMD pre-assembled board and says it's completely deaf, while he can hear lots of band activity with his FT-817ND. I volunteered to go over it with my scope and diagnose it. First

Thanks Mike! I have a few questions: *1. What is story behind the two different sellers? * There's hfsigs.com like you mentioned, and then what I was referring to: Sunil Lakhani VU3SUA at

Try ordering direct from India. It takes a few weeks, but that's how I got mine. http://www.hfsigs.com/buy.html - Mike KE0KRY [BITX20] <BITX20@...> wrote: -- Mike Haynes

I was looking at finally ordering a kit, and now they all seem to have disappeared. Only the PCBs are left. Do we know if/when they will be available again? Thanks all! --Mark

Thanks, i hope to do some test in the next days . Bye.

Ken:??Placement of the BFO freq relative to the IF passband will have an enormous effect on how the rig sounds on receive (and transmit!).??If your Si5351 is supplying both the BFO and VFO

i think that dds with ad9850 have only -6dbm ,you have put one small amplifier ;) 73 de 9a3xz 2016-11-27 21:12 GMT+01:00 ik8yfw@... [BITX20] <BITX20@...

Thanks Mike. Today I done a fast test with my 9850 based dds, it work well but input signals was weak than the original vfo. Then i think that the level of dds signal need to be buffered to work

I think all you have to do (if you use the DDS tap) is to remove the VFO Tuning Pot from it's 3-pin connector (TUNING1) This removes the voltage to the Toroid / Varactor pair - no oscillation and no

I'm going to try and play with a class D audio module with built-in programmable AGC parameters. This coupled with a $3 arduino nano clone could make a nice up-grade for the BITX40? WA6TKD

Hi Ashhar, i have two questions: 1. when connect DDS or External VFO do I need to desolder only the L4 coil and disconnect the tuning potentiometer? 2. I have replaced the six resistor to 220

I have a question on setting up my BITX40 board. I plan to use the onboard VCO and use the unit on 40M LSB only. I'm going to use the "FLL Freq Counter IK3OIL (BUILT) for my Digi readout. I'm going

Hi! Lets see how much all these mods improve the audio quality. Lately we have been working with TDA2822, these chips are easily available as they are widely used in USB pc ?speakers. They are dual

Thanks Rahul, That's another possibility I hadn't thought of yet. I have seen VK3YE do that before on his audio amps. I would have rather had a TDA7052A, but you can't have everything:-) Joel

Hi! While doing these mods try a 1nf cap in series with 10k resistor between pin 1 and 5 this also helps with the audio. 73's Rahul VU3WJM

Thanks Joel. I removed the cap at Pin1 & 8 long ago and that helped a lot. I'll try the 470 later today. Hope you had a good Thanksgiving. 73 Ken <BITX20@...> wrote:

Hi Ken, No I haven't had much time over the holiday with my Family being around, however, the first thing I'm going to do is change that 450mfd snubber cap on the output of the LM386 to a 220. If you

Hi Joel Did you ever check out the caps for the bassy audio? 73 Ken BITX20@...> wrote:

Milliamps actually. Not milliwatts. Sorry. :-) <BITX20@...> wrote:

Tried uploading a circuit to Files but it didn't work. Anyway it's in this video along with a description and a demonstration. An LED, LDR, one transistor and little else. 73, Peter VK3YE