[Heathkit] SB-200 10M Power Output

[rbethman]

Mark,

A pair of 572Bs is about 600W out in GG normally.  The lower output on 
higher bands, i.e., 15 and 10 mtrs is pretty normal.

Bob - N0DGN

Mark K3MSB wrote:
> Folks --
>
> I'm working on a friend's SB-200.
>
> I'm getting between 550 and 600W out (CW) on 80-20,  500W on 15,  and
> between 300 and 400 on 10M.
>
> I'm trying to figure out if there's anything I can do to increase the
> output power on 10M.  Here's what I've measured:
>
> 28.0:   350-400W.   (75W drive, 1.5:1)
> 28.4:   300W          (75W drive, 1.5:1)
> 29.0:   300W          (50W drive, 2.1:1 )
>
> For reference:
>
> 14.2:  600W  (60W, 1.2:1)
>
> The figures in parenthesis are the drive from my 756P3 and the SWR
> indication between 756 and linear.
>
> I initially thought to adjust L1 to bring down the SWR for a better
> tuned input match for the phone band.  However, after looking at what
> I'm getting on the low end of 10 (good SWR) and the mid and higher
> parts of 10M (mediorce SWR),  I don't think it's worth it to muck with
> L1 to get another 50 to 100W of output power.    I'm getting plenty of
> drive as it is.
>
> The tubes are not new, and I've had to replace just about every
> resistor in the beastie.   I'm thinking the tubes are just soft.
>
> Comments?
>
> 73 Mark K3MSB
>
>   

-- 
Bob - NØDGN