Very good HAM setting, used only one instrument, but is not the best for laboratory setting, you not have any referent to the real frequency received; the error is very low, but is possible make somet

#bfo #calibration #frequency

I used a frequency counter to tune my uBITx v6 just two days ago. I set the display to the center of the bands (16600 khz), then entered 'Set Freq...' mode. Then I adjusted the clk2 frequency at TP12

#bfo #calibration #frequency

Thanks Loris, You explained very clearly! I have access to some laboratory equipment on a limited basis, so knowing in advance which method will be better suited grants me the better use of them! 73 d

#bfo #calibration #frequency

P.S. Rafael, the laboratory measurement of the BFO is a little more complex operation, you consider that CLK2 is fixed to receive the USB, so it must be 1.5 KHz lower than the center frequency of the

#bfo #calibration #frequency

Hi Rafael Pay attention to USB and LSB, in the µBITX-V6 the CLK2 is fixed, while the CLK1 switches from about 57 MHz to about 37MHz according to the selection of the side band used. The documentation

#bfo #calibration #frequency

Hi folks, Assuming I have RF laboratory instruments available, what could be an ideal scenario to calibrate ubitx frequencies ? Would it work to set a RF generator to 10,000,500Hz and expect to receiv

#bfo #calibration #frequency

Hi George, I would suggest looking at the S-meter while removing power to the PAM8610 amplifier module. I've also been playing with using a Class D audio amplifier in my V.4 uBitX, but so far I've not

#ubitx-help #v5 #bfo #filters #noise

Hi again, I have a small update on the excessive noise that you may have noticed in the audio samples. The reason for that is that my speaker is connected to the PAM8610 amplifier board using two-wire

#ubitx-help #v5 #bfo #filters #noise

I bought a ubitx that was described as being deaf. On mine, adjusting the receive frequency alters the bfo.

#ubitx-help #v5 #bfo #filters #noise

George, That does sound good! Glad you got it solved, now have fun! 73 Evan AC9TU

#ubitx-help #v5 #bfo #filters #noise

Had same issue here. Painstaking BFO adjustment in need. And heed the advice above writing down settings before saving. Twisted my lone brain cell here until Evan told me settings go away everytime yo

#ubitx-help #v5 #bfo #filters #noise

Hi again, it seems that I managed to make my uBitx sound better. Raj, I set the BFO to 11.05555 MHz and I confirmed that I could listen to incoming stations. You were right! Evan, I tried the bass boo

#ubitx-help #v5 #bfo #filters #noise

First set the BFO to 11.0555 (MHz) and try again. SSB may become OK. You have quite a bit of noise in your location. Raj

#ubitx-help #v5 #bfo #filters #noise

George, To me, it sounds like you do not have the signal tuned in. The other alternative is that the BFO needs to be adjusted. Before making the LM386 mods, I would recheck the BFO tuning. Remember to

#ubitx-help #v5 #bfo #filters #noise

Thanks to all of you for your answers on that; following Raj's suggestion, I just recorded what I can hear on both receivers, the uBITX and the RTL-SDR on 40 m. I use exactly the same ATU settings on

#ubitx-help #v5 #bfo #filters #noise

Evan, i have put a message for you, in the post of the quality tricoid

#ubitx-help #v5 #bfo #filters #noise

Futzing around with my V3, I used this to alter bandpass of lm386 (located in ab7vf folder in photos section)

#ubitx-help #v5 #bfo #filters #noise

I opened my v5 case to take a picture of how I added the bass boost to the LM386.

#ubitx-help #v5 #bfo #filters #noise

George, I had similar issues and added a "hiss" reduction to the LM386. In essence that is a "Bass Boost" or low pass filter to allow for higher volume settings without the annoying static. I got that

#ubitx-help #v5 #bfo #filters #noise

Good idea Raj, I will do it as soon as I can and report it here. And I will try that resistor in series with the input signal, too. However, loud AM stations are received OK on ubitx, therefore that's

#ubitx-help #v5 #bfo #filters #noise