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New BITX40v3 seams deaf on ssb phone signals
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I just got the new 40 m version three board in the mail three weeks ago. Very pretty packaging I might add. Unfortunately this thing seems ?not to like S9 phone signals in the extra class portion of the 40 m band. It actually doesn't like any voice signals. I can hear some strong CW stations in that portion of the band but no real voice conversations. When I kick my dipole over to any one of my other HF Rigs, ?are your booming voice signals. ?The food suffered no trauma in transit that I can tell and everything seems to be fine.? Any ideas now? I'm thinking of throwing a signal generator on it and seeing what I got. |
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Mark W
开云体育Someone has probably mentioned this already, but out of the box, I’m not sure it tunes very far into the US phone portion of the band. ? From: BITX20@... [mailto:BITX20@...]
Sent: Tuesday, December 06, 2016 9:33 AM To: BITX20@... Subject: [BITX20] New BITX40v3 seams deaf on ssb phone signals ? ? I just got the new 40 m version three board in the mail three weeks ago. Very pretty packaging I might add. Unfortunately this thing seems ?not to like S9 phone signals in the extra class portion of the 40 m band. It actually doesn't like any voice signals. I can hear some strong CW stations in that portion of the band but no real voice conversations. When I kick my dipole over to any one of my other HF Rigs, ?are your booming voice signals. ?The food suffered no trauma in transit that I can tell and everything seems to be fine.? ? Any ideas now? I'm thinking of throwing a signal generator on it and seeing what I got. |
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If you attach the antenna, does the noise go up substantially? If yes and if you can hear only CW stations but no SSB then you have to just move the trimmer gently to cover the SSB portion of the band. if the receiver noise is not going up when you attach the antenna, then, more often than not, this is just a problem of T1, T2, T3 being bent in the transit. The tinned portions of the wires from these three transformers often touch each other leading to this deafness. Keep the antenna connected and gently move the wires of these transformers away from each other. This should fix it. - f On Wed, Dec 7, 2016 at 10:26 AM, expatrick@... [BITX20] <BITX20@...> wrote:
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Mark Receiving CW but having broken audio on SSB might be caused by several things but I would start with checking the BFO frequency relative to the crystal filter characteristic.? The BFO for USB should be 12 to 16 db down on the lower skirt of the filter passband.? Another possibility is that there could be something wrong with BFO injection level (too low) which could be the case if you have replace the BFO oscillator with a DDS or Si5351a and set its output level too low. Same thing with incorrect LO injection levels. It could also be something really trivial like a damaged speaker (dirt in the air-gap or a bent frame) causing the voice coil to drag. Arv? K7HKL _._ On Tue, Dec 6, 2016 at 8:56 PM, 'Mark W' k3mrk1@... [BITX20] <BITX20@...> wrote:
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