[TenTec] 1254 receiver sensitivity

[Glenn Scott]

Hi Al,


I think you're correct about meeting at Shelby a few years back. I usually hang out with Larry Wright, N4QY, who is a good friend. Larry usually has a  fair amount of boat anchor gear and I do sometimes as well. I didn't go to Shelby the last couple of years since I do not do well with high temps and high humidity any longer. I wish they'd push it out to mid October but I don't see that happening..Hi
 Good luck with you 1254.. For the parts count it's a decent receiver.


I guess you know about the mods you can do to install a new display bd for better tuning resolution and dual VFO's. I may install that mod later as well as install an SO232 on the rear panel.


73,
Glenn WA4AOS



-----Original Message-----
From: Al Parker <anchor at ec.rr.com>
To: N4ch <N4ch at aol.com>; tentec <tentec at mailman.qth.net>
Sent: Mon, Nov 14, 2016 10:51 am
Subject: Re: [TenTec] 1254 receiver sensitivity

Good AM Herman,
	Many thanks for the note.  Yes, it is the small kit rcvr that you 
suspected.  I've got one other thing on the bench now, should get that 
off today, and will go "a tapping" at those xfmrs.  Hopefully it'll be 
an easy fix like you had.
	I'll post my findings on the list.
cu at Benson this Sun.?
73,
Al, W8UT

On 11/13/2016 9:09 PM, N4ch at aol.com wrote:
> Hello Al,
>
> Without digging thru all my Ten-Tec stuff, I THINK this is that
> synthesized receiver they offered as a kit.   I never built one, but if
> it has any of those small shielded "binocular" transformers in it (like
> some of their bigger receivers), I've fixed at least a couple of their
> more elaborate receivers that had sensitivity problems caused by these
> parts (very small transformers covered with a metal shield
> can........they have large holes, and the transformers are plainly
> visible).   On both receivers, the sensitivity was down 20-30 dB, and in
> both instances I could get the sensitivity to abruptly improve if  I
> gently  tapped the subject circuit board.   Turned out that there was a
> small nick in the insulation of the enameled copper wire that one
> of these transformers were wound with, and it was pretty easy to isolate
> which transformer was flaky (there were several on the board) and was
> causing the problem.   I could take a plastic rod, and simply touch it
> to the transformers' cores, or gently tap and press the cores back and
> forth, and easily pin down the one that was causing the problem.   It
> was a fairly easy fix.........I simply removed the shield, bent it
> outward slightly, and re-installed it, so that it didn't touch any of
> the small enameled wire.........not as involved as removing/re-winding
> the transformer, but it seemed to take care of the problem.
>
> 73, Herman, N4CH.
>
>
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