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Frequency calibration on a lab
#bfo
#calibration
#frequency
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
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
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By
Loris Bollina
· #85169
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Frequency calibration on a lab
#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
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
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By
rtemp@...
· #85168
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Frequency calibration on a lab
#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
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
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By
Rafael Pinto [PU1OWL]
· #85162
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Frequency calibration on a lab
#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
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
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By
Loris Bollina
· #85160
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Frequency calibration on a lab
#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
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
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By
Loris Bollina
· #85159
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Frequency calibration on a lab
#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
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
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By
Rafael Pinto [PU1OWL]
· #85146
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Noisy RX on ubitx v5
#ubitx-help
#v5
#bfo
#filters
#noise
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
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
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By
Jonas Sanamon
· #82775
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Noisy RX on ubitx v5
#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
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
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By
George Metaxas
· #82771
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Noisy RX on ubitx v5
#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.
I bought a ubitx that was described as being deaf. On mine, adjusting the receive frequency alters the bfo.
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By
_Dave_ AD0B
· #82606
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Noisy RX on ubitx v5
#ubitx-help
#v5
#bfo
#filters
#noise
George, That does sound good! Glad you got it solved, now have fun! 73 Evan AC9TU
George, That does sound good! Glad you got it solved, now have fun! 73 Evan AC9TU
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By
Evan Hand
· #82603
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Noisy RX on ubitx v5
#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
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
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By
Viktors Miske
· #82587
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Noisy RX on ubitx v5
#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
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
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By
George Metaxas
· #82585
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Noisy RX on ubitx v5
#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
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
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By
Raj vu2zap
· #82535
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Noisy RX on ubitx v5
#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
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
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By
Evan Hand
· #82530
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Noisy RX on ubitx v5
#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
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
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By
George Metaxas
· #82529
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Noisy RX on ubitx v5
#ubitx-help
#v5
#bfo
#filters
#noise
Evan, i have put a message for you, in the post of the quality tricoid
Evan, i have put a message for you, in the post of the quality tricoid
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By
Gerard
· #82525
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Noisy RX on ubitx v5
#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)
Futzing around with my V3, I used this to alter bandpass of lm386 (located in ab7vf folder in photos section)
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By
Jim Tibbits
· #82522
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Noisy RX on ubitx v5
#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.
I opened my v5 case to take a picture of how I added the bass boost to the LM386.
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By
Evan Hand
· #82519
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Noisy RX on ubitx v5
#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
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
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By
Evan Hand
· #82518
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Noisy RX on ubitx v5
#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
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
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By
George Metaxas
· #82515
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