S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!
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Hello again guys.
Performing the RF alignment of the S-85 I am refurbishing, I got the following problem in bands 1 and 2.
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The setup conditions were as per service manual:?
Sig-gen (HP 8640B) connected to the rig via my DIY RTMA Dummy Antenna. Signal level -80dBm , AM modulation at 30%.
Dials, switches and regulations as per service manual.
The OSC setup went trough seamlessly allowing a quasi perfect dials alignment.
Unfortunately ?C4 and C15 (ANT and MIXER band1) and C3 and C14 (ANT and MIXER band2) didn't peak and had to be set at minimum capacitance (all open) ?just to get the higher output signal possible.
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Does anybody have any idea about the cause of such a problem and/or suggestion on how to fix it?
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Thank you very much.
Emanuele (IU1KNR).
https://egirland.blogspot.com
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Emanuele Girlando