[Heathkit] SB-10/SB-200 combo

[David Thompson]

Tom,

Its a stretch to use the SB-10 to drive the SB-200.  The max the SB-10 puts 
out is 6 or 7 watts.  This will even overdrive a AB1 amp using say a 4-400A 
as I did years ago. In AB1 about 1 watt is all you need.  You need 80 or 90 
watts to drive the SB-200.

Most believe that you hook the SB-10 into say an Apache or DX-100 and that 
would work for driving the SB-10 as you have an amp in between.

Most VFO's only have an RMS voltage output of 15 or 20 and I have found you 
need 40 or 80 RMS and with that you get a couple of watts out of the SB-10. 
On SSB the key is to find a very stable VFO/exciter.  You could build one 
using a Collins PTO, use the 310C or B Collins exciter or a Commercial 
exciter that allows you to control the output such as the Ten Tec Century.

If you must try a Heath VFO use the later HG-10 not the VF-1 but its best to 
use a VFO with its own power supply especially if it has voltage regulation.

There was an article in a mid 1960's CQ that built a complete 50 watts 
exciter with the SB-10 in its cabinet.  You still need a stable VFO.

Good luck Dave K4JRB

----- Original Message ----- 
From: "Tom Chesek" <tchesek at epix.net>
To: "Heathkit Reflector" <heathkit at mailman.qth.net>
Sent: Monday, June 29, 2009 1:43 PM
Subject: [Heathkit] SB-10/SB-200 combo


> In the past I've seen comments to the effect that they used an SB-10 to 
> drive an SB-200. What is used for rf for the SB-10, a VFO? Does a VF-1 
> have a high enough signal level for this?  What are some other 
> considerations doing this? Comments appreciated.
>
>
>
> ...and before you ask why do it the answer is just because.
>
>
>
> Tom K3TVC
> ______________________________________________________________
> Heathkit mailing list
> Home: http://mailman.qth.net/mailman/listinfo/heathkit
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Heathkit at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>