Pace 1000B low S-meter reading on AM only

[ExitThirteen]

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, plus the "blank" channel on the dial is a functioning channel, channel 24). I didn't really see any board number anywhere on it, if I locate it, I'll post it.

The trouble is that on AM, when receiving a strong close range signal (S-9+), the meter shows only about 3 "S" units. The receive audio is great, clear and loud. On SSB, the meter reads as it should (S-9+), 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

 

[Beetle]

"Google", as they say, "is your friend."

http://www.cbcintl.com/sams.htm . This link takes you to a list of Sams Photofacts and tells you where you can obtain the one you need. The Sams publications are very useful and accurate. Assuming the copying process the seller uses is reasonably careful, the drawings should be clear and as readable as the original.

There just about HAS to be an adjustment for the S-meter, but remember that no S-meter ever built by human hands is going to be a lab-quality instrument. It's just a relative indication under the best conditions.

Anyway, try the link and see what you get. I think the number for your rig is Sam's #94, but double check.

 

[freecell]

set the mode selector switch to am
signal generator to 27.115 no mod.
channel selector to ch 13
sig gen output to 100 uv.
adjust r363 for s9 reading........

 

[ExitThirteen]

Thanks for the replies Beetle and Freecell!

Beetle, I tried going to the site you suggested, before I came here and made my initial thread, but I couldn't get on the site for some reason. My googlefu isn't weak, just over-protective, it seems.

Freecell, I did adjust R363 as per your instructions, but the weird thing is, when I do that, my audio level drops down. I have it set properly now, but my audio on AM isn't as strong as it was before I adjusted it. Pretty strange. Perhaps I am overlooking something.


-Exit