[R-390] R390 Low Gain at 8 kHz BW

[Jacques Fortin]

I forgot the first 2.7 ohms resistor: R507 !
These old eyes, you know...

73, Jacques, VE2JFE

-----Message d'origine-----
De : r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> De la
part de Jacques Fortin
Envoyé : 5 juin 2019 20:09
À : jgedde at optonline.net; 'R-390 Forum' <r-390 at mailman.qth.net>
Objet : Re: [R-390] R390 Low Gain at 8 kHz BW
Importance : Haute

Hello John,

12dB down ? WOW !

I have one or two ideas:

1_ Check all the 2.7 ohms resistors in the IF deck: they are only used when
the 8kHz BW is selected. (R514, R 524, R529, R534) check also the internal
IF coils continuity (the ones selected for the 8kHz BW).
2_ Check R519, which was a selected manufacturing value to set the global IF
strip gain when the 8kHz BW is used. Remove it or measure value. If
doubtful, replace with a modern resistor of the same value.

73, Jacques, VE2JFE