[Boatanchors] SX 99 problem

[Garey Barrell]

John -

Just a guess, but perhaps C38 is "wound too tight" and injecting too 
much BFO signal into the grid of V4..?

Actually S6 applied B+ to the BFO, V5.  The BFO signal is coupled to the 
grid of V4 via C38, a twisted wire "gimmick" capacitor.

73, Garey - K4OAH
Atlanta

Drake C-Line Service Manual
<http://www.k4oah.com>



John King wrote:

>All functions, on phone, AVC, sensitivity, volume,
>selectivity, Crystal phasing, tone control,
>receive/standby work as they shoulod. BUT, when the
>phone/CW switch is switched to CW the receiver goes
>silent instead of engaging the BFO. There is no audio
>and the BFO doesn't produce a hetrodyne on a signal
>with a carrier , in fact, audio completely disappears
>exactly and the S meter pins at S9+ 60db. the audio
>disappears and the meter pins EXACTLY AS IT DOES WHEN
>THE RECEUVE/STANDBY SWITCH IS SWITCHED TO STANDBY.
>
>All the cw/sphone switch does is connect the plate of
>the triode section of V5 to the grid of V4, the second
>IF . I may be missing something, but I see no reason
>for the receiver going dead when switched to CW.
>
>  
>