[Hallicrafters] SX-100 AVC question - Answer

[Rodney Bunt]

There are two AVC schemes.

In the Mk1 model a delayed AGC is employed, through R46 and R47 a 4.5v reverse bias is applied to
pin 9 of the V7 so that the IF signal level must be above this to have any effect on the AVC.

In the Mk2 this was entirely done away with, it would be quite easy to reconstruct a delayed AGC
for a Mk2

Rodney
VK2KTZ

--- krkaplan at cox.net wrote:
>   My SX-100 Mk 2 gets much louder when I switch off the AVC. For instance, if I set 
> the RF gain (Sensitivity) at 10 and then switch off the AVC, I need to reduce the RF 
> gain to around 7.5 to 8 to get a comparable signal level. Is this normal behavior for 
> an SX-100 or do I have an AVC issue? I kinda expected it to be the opposite. What 
> say you SX-100 owners?
> 
> 73's Ken Kaplan kb7rgg
> 
> _______________________________________________
> 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


__________________________________
Do you Yahoo!?
Yahoo! SiteBuilder - Free, easy-to-use web site design software
http://sitebuilder.yahoo.com