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think about the fact, that three squarewaves are generated within a tiny chip, for clocking digital circuits crosstalk normally is not a bit issue, but for analog circuits this must be an issue! This

Very nice! A simple way to go to 80m, certainly simpler than my multi-band conversion.? -- Ryan Flowers W7RLF MiscDotGeek.com ( http://miscdotgeek.com ) Multi Band BITX40 (

Hi All, From my experience with si5351 , I think results will be bether when use crystal BFO with another one 12 MHz crystal, like other projects from Mr. Farhan, and use A and B channel from Si5351

The birdies are a result of the oscillator radiating out from the wires. If there are ground loops or wires connecting the radiuno to the main circuit, you will get these birdies for sure. just for

After changing the IRF, did you set the 100mA current with the bias preset pot (blue) ? Set the blue preset fully clockwise and see what current you get. When you press PTT the current will not change

Willy, Just a follow-up, I stayed up all night and nothing opened up. Kept looking for you but just a s9 noise level. Ed W0OIC

Hi Roberto and Andrew I have a part built ubitx as well.? I ran Raduino software on Arduino nano, using all 3 clocks, and found the large number and strength of birdies on all bands made the rx

Perhaps you are measuring harmonics, If i am right.?try a small LPF and then check.? Reduce the gain of the counter 's pre-amplifier.

I have built the W8TEE B40 and the display works along with the rotary encoder but the AD9850 is not working properly in the code.? The output frequency of the 9850 at 7.000.000 Mhz is 39.2 Mhz and

Tonight soldered together the beefy qrpkits 80 meter low pass filter and hung it on the output of my modified bitx40 (with 470 pf capacitor across the bandpass filter). Bitx40 BNC to BNC filter input;

Thanks, Marco! Jack, W8TEE

I plan to build something similar using a separate BPF and LPF each for 160m, 80m, 40m, 30m, and 20m. ?Call it FrankenBitX, BruteForceBitX, or maybe DontKnowWhatImDoingBitX. It would work without

Test the current after disconnecting the 12V/13.5 supply to TX? mosfet.?If the current reduces, then i suspect the IRF.?all the best. sarma / vu3zmv

I heard nothing except a carrier on 7.277. Checked 7.285 and 7.177 but heard nothing in either place. Vince. -- Michigan VHF Corp. http://www.nobucks.net/ http://www.CDupe.com/

Hi Jack -? It looks like the modifications have been fairly comprehensively documented on this markdown page:? https://github.com/amunters/bitx40/blob/master/operating-instructions.md Best, -Rob

I worked Willy briefly right at 7EST. Signal reports were 55 & 56, then he disappeared. Heard him really loud a little later, but I guess that was after he cranked up the power. -- John - WA2FZW

Well, early evening (IMHO) is when we have the regular get together and we can all see how well that's worked out lately. I'm pretty much available anytime (particularly when the flying weather

Hi, Was busy with my Bitx40, and i saw "smoke". I replaced the Power amp. The receiver works, and if I press the ptt it clicks, and the ammeter rises to about 3.2A, but no audio output. Any help would

I called and listened up here in Western WA, and heard a station calling around 7:30 or so, but all I could hear was their faint CQ. Maybe we should move to JT65 or FT8? :P -- Ryan Flowers W7RLF ?

I was calling around 7 from northern BC, but I heard nothing. By that time, it was completely dark here and propagation appeared to be completely dead. I had been listening all day to the CQ WW on