[Elecraft] KSB2 Increased Gain Modification

Tue Nov 11 09:53:00 2003

--- David Pratt <[email protected]> wrote:

> I have carried out the KI6WX mods, Mike, and they work fine.
>
> ...
> ...
>
> An observation though, is that I find that, although the carrier 
> rejection pot is not as critical, carrier rejection is not as good as 
> with the original design.
> 

This *MAY* have to do with lead dress.  When I first made this mod myself,
I noticed a slight S-meter reading on one of the sidebands on receive with
no signals present (I don't remember whether it was LSB or USB).  The cure
was to re-route the lead connecting to the base of the '2222 away from the
traces of the nearby chip on the board.  Problem solved.  :-)

But even without the mod, I think the carrier suppression could be better
than what it is.

73, de John, KD2BD

=====
-=-=-=-=-=-=-=-=- John A. Magliacane, KD2BD -=-=-=-=-=-=-=-=-=-=-=-=-=-
   Internet  : [email protected]  |  Video : 426.250 MHz/439.250 MHz
   Satellite : UoSAT-OSCAR-22   |  Morse : -.-  -..  ..---  -...  -..
   Voice     : +1.732.224.2948  |  WWW   : http://www.qsl.net/kd2bd/
-=-=-=-=-=-=-=-= Linux Doesn't Cost.  It Pays. =-=-=-=-=-=-=-=-=-=-=-=-

__________________________________
Do you Yahoo!?
Protect your identity with Yahoo! Mail AddressGuard
http://antispam.yahoo.com/whatsnewfree