[Elecraft] K3SYN3 with and without stiffener (was: shielding)

[Alexandr Kobranov]

I am not sure - aren´t there 2 modifications of KSYN3 module - one for
avoiding PLL problems in higher temperature (by changing R from 89k to 50k)
and the second one for curinng "chirp" problem by increasing of the gain of
some transistor by replacement of some other resistor? I suppose only the
first one is a part of KSYN3 stiffener u/g.
Or am I wrong?
(Just to make clear which one is curing temperature stability, which one
"chirp" problem and stiffener for avoiding "microphonic" effects.)
73!
L.exa, ok1dst
K3/100 #727

P.S.: Hope to see some of you in Friedrichshafen this week!



2010/6/23 Bill W4ZV <btippett at alum.mit.edu>

>
>
> Sverre Holm (LA3ZA) wrote:
> >
> > Thanks for comments - OK it's a stiffener, not a shield.
> >
> > Looks like I should put the stiffened KSYN3 in the primary position then,
> > eliminating the possibility for transmitting a chirpy signal when
> > monitoring the transmission on the internal loudspeaker. With time I can
> > perhaps upgrade the second synthesizer with a stiffener.
> >
>
> Both the DDS Gain Mod (for chirp) and the Stiffener Mod primarily affect
> the
> transmitted signal, so both mods should be installed in the Main VCO.  For
> KRX3 users, Elecraft recommends making mods to both VCO boards in case
> those
> boards should accidentally be swapped in the future.  If you take care to
> mark the modified board, IMO it should not be necessary to modify the other
> one.
>
> 73,  Bill
> --
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