[TenTec] 1254 receiver sensitivity

[N4ch at aol.com]

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.
 
 
 
In a message dated 11/13/2016 4:34:47 P.M. Pacific Standard Time,  
anchor at ec.rr.com writes:

Hi,
I know this list is practically non-existent,  but maybe some folks are 
still getting it (I hope).  (I've been  subscribed to this list for 6-8 
yrs, haven't seen anything lately, thought  it was defunct.)
I'm trying to get a 1254 all band rcvr going  for a local octogenarian. 
He bought it some yrs ago built, says it did  work well, but quit.
It works, sort of, it's very  insensitive.  Will hear a 50uv signal but 
not 1uv.  Does know  that WWV is there at 10mc, but not strong enuf to 
hear the  audio.
I rebooted the microprocessor, it might have gotten  marginally better. 
I know they weren't known for super sensitivity, but  this one's pretty 
hard of hearing.
Any tips for  us?
tnx, 73,

Al,  W8UT
www.boatanchors.org
www.hammarlund.info

"There is nothing --  absolutely nothing -- half so much
worth doing as simply messing about in  boats"
Ratty, to  Mole
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