[Heathkit] HW100 prod det diodes

[wb8jkr@juno.com]

  I'd leave the 1n34's in instead. There has been
documentation that hot carrier diodes are an
improvement in distortion down around the
100-200 Hz range but hardly worth the effort
in a SSB rig with a 2.1 Khz filter. 1N914's turn
on at a higher lever than the germaniums and 
the BFO injection is already marginal on most Heath
rigs. If you really want to try an improvement in
this area I'd buy a pile of 1N34(A)'s and select a
matched set of four, install them and maybe you'll see an
improvement in minimum carrier null, but even that is more
work than its worth for another 5-10 db carrier suppression.
 I'm talking about the balanced modulator diodes now, the
product detector in the HW/SB transceivers is a
vacuum tube.

73,  Mark  WB8JKR


On Wed, 13 Feb 2002 17:39:47 -0500 "R.J.Keller" <rkeller@ij.net> writes:
> Hi Heathkit fans,
> I read somewhere that audio quality can be improved by substituting
> Schottky hot carrier diodes in the prod det for the 1N34A's supplied
> by Heath. I went through my junk box and the best I can come up with
> is high speed silicon switching diodes type 1N914. I would thinik 
> this
> would be better than the 1N34's but would appreciate some input on 
> the
> pro's and con's.
> 73 Dick KF4NS
> 
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