Went thru that myself about six months ago. It was quite noticeable with
the 250 Hz filter.
Your guess is exactly what I guessed and sort of strongly implied by TT docs
maybe markings on the case, etc. HOWEVER, TT says that the C is used to set
the frequency at the 12 o'clock position i.e. don't touch the R.
I am glad I set mine because I discovered that that C was a bit flakey and a
quick spray of DeOxit cleared it up.
Within 4 months or so, the frequency drifted again so that it is again
noticeable with 250 Hz filter.
From: George Maier <firstname.lastname@example.org>
To: email@example.com <firstname.lastname@example.org>
Date: Tuesday, August 31, 1999 3:05 AM
Subject: [TenTec] Omni V PBT adjustment
>Fellow Ten Tecnocrats:
>Apologies if this is a repeat message; had some reflector access
>probelms which were cleared up thanks to
>the able help of Jim, AD6CW, the list admin.
>The PBT in my Omni V seems to be mis-aligned (not centered). Otherwise,
>the rig is
>so good that I've ignored the PBT issue, because it's a low level
>problem. Now it's time to get it right, however.
>The manual shows two adjustments on the PBT board, but gives no detail
>how to approach an alignment. I'm guessing that C22 is there to get the
>xtal dead on freuency, while R18 is used to set the PBT to center when
>knob out front is centered. I'm also guessing that the carrier
>oscillators should be set up first. Can anyone tell me if this is
>Had to sign off the reflector for a while due to personal issues, but
>it's great to back where people still sell, swap, buy, and talk
>technical more often than not.
>Thanks for bandwidth..
>George Maier - K1GXT
>FAQ on WWW: http://www.contesting.com/tentecfaq.htm
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