SB-313 Receiver Problems

[Jim Bo]

I have an SB-313 with a problem and I am hoping someone here can
help me.

The radio receives short-wave stations, but the tuning seems
"noisy" and you will get heterodynes when tuning.

If I have a station tuned in, just moving the tuning dial 0.5 Khz
will result in noise or static in the speaker, sounding like a
dirty pot.  Additionally, the station may jump in frequency or
all together not be heard.  Rocking the VFO back and forth with
produce the scratchy noise and cause loss of the station at
times.  If I tune a station and just leave the radio alone, it
receives fine, with good audio and signal strength.  But if I
touch the VFO knob, I get the noise and loss of station and
sometimes heterodynes.

I have removed all the pcb's and "retinned" the copper tracks so
they make good ground contact, and I have tried terminating the
output of the LMO with 47 ohms with no luck.

Any ideas out there?  Sure would like to get this radio working.

Thanks

Jim

Sponsored by the City of Tempe 

Listserver Submissions:  heath at listserv.tempe.gov
Listserver Subscription: listserv at listserv.tempe.gov - "subscribe heath 'name' 'call'"
Listserver Unsubscribe: listserv at listserv.tempe.gov - -"signoff heath"