The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

Howdy folks,

I got a bit of an unusual trouble.... I recently acquired an old Pace Sidetalk 1000B 23 channel AM/SSB base from a friend. I cleaned it up, did a tuneup on it, and lined up all the crystals so they are on frequency, for the most part (this radio goes up to 27.605). I didn't really see any board number anywhere on it, but if I can locate a board number, I'll post it here on this thread.

The trouble is that on AM, when receiving a strong close range signal, the meter shows only about 3-4 "S" units. The receive audio is great, clear and loud. On SSB, the meter reads as it should, with audio clear and loud. I did a receive alignment, but didn't really change anything for the meter movement on AM.

Might there be a component that could be bad in the meter circuit on AM that I am overlooking? I love using this old radio, it's a nice clean vintage unit, and it talks quite nicely. The only rub is that the "S" meter reading is very "stingy" on AM. Any help would be greatly appreciated. Thanks!

-Exit

There should be a variable adjustment pot in the radio
to set the s meter level.If we had the pcb number,we
probably have the info. to help..Ill check my s.a.m.s
and other info. and see if i can find the v.r. location\
and get back to you.

The AM signal meter pre-set is R363; try adjusting, if this is not the fault check CR315, CR316, C332, and C343. Coils T305, T306, and T307 are the only ones which are common to AM.

Most excellent, thanks for the replies you two! I'll look into this and let you two know how I get on. Cheers!


-Exit

Update on the Pace.... I adjust R363, and the meter moves as it should now, but the RX audio went down! I adjust R363 back down, and the RX audio goes back up!

When I switch the meter from the S. RFO setting to SWR or CAL, my receive audio goes up slightly. Turn it back to S. RFO, and it drops down slightly.

Strange occurance indeed, but at least the meter reads as it should now. Thanks!


-Exit

Due to the age of the radio, I would change some caps.
C338, C352, C502, and C503 there are all 1uF at 16 volt or higher, C352 is across the S/RF meter.

Change some caps in the RX/TX switching C703, C704, and C705 there are all 220uF at 16 volt or higher.

You may find that some of the cap are 10 volt just change them to 16 volt or higher.

HELP WHAT DO I NEED TO DO TO GET THE CHANNEL TO GO TO THE 27.605 PLEASE HELP ON THE PACE 1000B SIDE TALK CB

KPEPPENELLI@CFL.RR.COM