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Fellow Utix v6 users.? I have a new v6 radio I am trying to determine if it is properly working.? I am unable to pick up wwv signals so I am calibrating using a mfj 259b as a signal source.? I have gone through the calibration process to the best of my knowledge.
Next I started checking voltage in the recv circuit . q20,21,22,40,41,42 and 70 check out.? Q74 has o dc volts on all leads.? Is this correct???

Thanks for your responses. Bruce

Bruce,

The MFJ is handy but its far from calibrated in frequency.??

Allison
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No direct email, it goes to bit bucket due address harvesting in groups.IO

Bruce,
Q74 is used to mute the audio in when in transmit mode.? This reduces the input, yet still allows the sidetone to feed the audio amp to be herd.? If you check the rest of the schematic, you would see that there is no voltage source until T/R goes high, turning on the gate and then shorting the audio feed line that has been opened by the relay from the product detector.?

You can use any AM broadcast station for calibration, as long as you know the exact frequency of the station.? Even USA AM could be used, however the higher the frequency the easier it is to be accurate.

FWIW
73
Evan
AC9TU

Bruce

have you performed an alignment of the BFO?? if it were decently off sensitivity would be reduced.? of course listen to the lower ham bands as their should be strong signals there.?

Curt wb8yyy

Bruce,
As Curt said in his response, the BFO has a HUGE impact on the sensitivity of the rig.? You need to have the audio response centered in the passband of the SSB filter.? The way that I have done that is to use either an audio spectrum analyzer or the BFO Tuinig aid web page here:


The full alignment process is outlined in this video from Ashhar Farhan:


Note that the first BFO adjustment is to provide the low audio frequency response for zero beating, then use it to calibrate, then set the BFO for the full audio spectrum.? It is important to adjust the BFO for the low range response so you can hear the zero beat signal better.? Then for best sensitivity and audio response to center the plateau properly. between 300 and 3,000 Hz.

Try the BFO adjustments to see if that helps get you on the frequency and with a good response.??

BTW, For me in Illinois WWV on 10MHz at night has been the best source for calibration.? There other frequencies at 2.5, 5, 15, and 20MHz as well.? Low frequencies during the night, and higher frequencies during the day.
73
Evan
AC9TU

Thank you Gentlemen!
I am now able to tune in strong local AM stations.? I went back to the BFO tuning tool and watched Ashhar YouTube.? I was not believing the tuning adjustment coming in around 150000, I just thought that was to far out of tolerance.? The video shows Ashhar adjusting to 130000 plus. So I think I am good.

Let me throw a broad question out there, what is the typical freg offset that others are coming up with???
Bruce Morrell KB8MW

I only have access to one of my calibrations for a v4.? It was 175000.

73
Evan
AC9TU