[Hallicrafters] Poor BCB sensitivty on SX-71

[WA3FIY]

On 26 Apr 2002 at 15:32, Philip Atchley wrote:
> 
> When I went through the alignment of the set all trimmers seemed to
> work well and smoothly and not have to be cranked down tight or
> loosened up excessively.  That would lead me to believe the coils are
> pretty much the correct inductance!  (The BCB antenna coil windings
> are black rather than the tan color of the other coils, I assumed this
> was a coating)  On the generator I noticed the sensitivity was much
> better on bands 2-5 also but at the time of the alignment thought it
> might be normal (many riceboxes "desense" the BCB band).
> 
I too have a SX-71 with that "black" BCB antenna coil.  In my 
case, it is black because it has apparently been hit by 
lightening and burnt black. Haven't rewound it yet.......it's on my 
to do list.  

Take a real close look at the antenna coil and do a continuity 
test of the primary.  Mine is open.  The trimmers would still 
work OK in such a case.

Good luck!

-73-

-Lee-