[Heathkit] SB200

[Carl]

I believe a 813 in GG has half the input impedance of a 572B. Therefore 
component changes may be required to get a good match.

Driving a pair of 813's directly thru a cap and no tuning network was also a 
common procedure since a pair is fairly close to 50 Ohms. That was fine in 
the days of tube drivers with pi networks.

Carl
KM1H

----- Original Message ----- 
From: <sbjohnston at aol.com>
To: <heathkit at mailman.qth.net>
Sent: Sunday, August 23, 2009 6:36 PM
Subject: Re: [Heathkit] SB200


>I believe the stock SB-200 has input tuning adjustments for each band.
> These will help you get a good match between the transceiver and the
> amp.  You should pick your favorite part of each band and set the
> adjustment for that band for minimum SWR to the transceiver.
>
> Do you have the manual - the procedure should be shown in there.    If
> you need a copy I see that mods.dk site has it.
>
> http://www.mods.dk/
>
>
> Steve WD8DAS
>
> sbjohnston at aol.com
> http://www.wd8das.net/
> ---------------------------------------------------------
> Radio is your best entertainment value.
> ---------------------------------------------------------
>
>
> -----Original Message-----
> From: Rick Gouge <rickgouge at shaw.ca>
> To: heathkit at mailman.qth.net
> Sent: Sat, Aug 22, 2009 1:45 pm
> Subject: [Heathkit] SB200
>
>
> Hello. I have been following the list and i have a SB200 with 813`s .
> The amp
> works very well. But when i transmit with the amp i have a mismatch
> between the
> radio and amp. The rig is a TS850s. I have to hit the autotune to make
> everything happy. The antenna is  1.3  match. Could the mismatch be
> caused by
> the length of coax between the radio and amp? Could the problem be
> something in
> the amp? or is this normal? Rick VE7RiK
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