[Hallicrafters] SX-100 Diffeences...Explained

[Rodney Bunt]

There are three minor difference, besides the IF Frequency being slightly different.

To make your SX-100 a MkII

There are two resistors from the AVC detector, one to groung the other to regulated 150v, remove
these two and connect the cathode of the AVC disde to ground.

Move the BFO injection capacitor from the GRID to the PLATE no adjustment necessary.

Replace the AM / SSB single pole switch with a double pole switch, use one side as before (turn on
the BFO HT) the other swithc is used to switch in a 0.47uF capacito in parallel with the 0.047uF
capacitor inthe AVC circuit, slowing the AVC in SSB/CW.

That is it. I have donr these modifications myself and am more than happy with the result.

PS: the AM/SSB swith is hard to find to match the ones in the AVC on OFF etc. I removed the
Receive/Standby switch and swaped it out for the AVC modification and out a lookalike in the
Receive/Standby position, by the way this has to be a thin switch as there are some chassis screws
that are in the way...

Rodney
VK2KTZ



--- Markus Thomerson <k5wtx at arrl.net> wrote:
> Hello and thanks for reading this post. I just aquired a SX-100 and I would
> like to know what the differences are (if any) between a SX-100, and the
> Mark IA or Mark II. Thanks again, Markus.
> 
> _______________________________________________
> List Administrator: Duane Fischer, W8DBF **for assistance**
> dfischer at usol.com
> ----
> Hallicrafters Collectors International: http://www.w9wze.org
> ----
> http://mailman.qth.net/mailman/listinfo/hallicrafters


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