[TenTec] 1254 receiver sensitivity

[Al Parker]

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.
>
>