[Heathkit] SB-200 Help

[Stephen Goldberg]

The original SB 200 input impedance is far from 50 ohms on most bands.  See 
the following site for a simple mod to correct the problem.
http://www.ne7x.com/sb200/heathkit-sb200.htm

Steve W4IMF

----- Original Message ----- 
From: "KBØNLY" <kb0nly at mchsi.com>
To: <heathkit at mailman.qth.net>
Sent: Friday, August 10, 2007 12:48 AM
Subject: [Heathkit] SB-200 Help


Ok, i got my SB-200 hooked up and now i got more problems than i know what 
to do with.

Lets start from the top..

I built and installed a SK-201 Soft Key module and that works great, keys 
the relay no problem.

I followed the manual and hooked it all up.

And i went to the operating instructions, this is where everything went 
FUBAR.

It says to switch it on and put the meter switch on Plate and i should see 
90ma of idling plate current with no drive from the exciter, i got ZERO.

Than it says i should advance the drive level of the exciter for 200ma of 
plate current.  Can't, why?  Because the amp is presenting a 3:1 SWR to the 
radio and the FT-847 backs down the power output because of the HI SWR 
condition it's seeing.

If i flip the meter switch to the Rel Pwr position i can see the power 
output of the 847 but thats about it.  I can adjust the tune and load 
controls until i'm blue in the face and get nowhere.

This amp was working perfectly before i bought it, and yes i am sure of 
that, but now i can't get it to do diddly.

73,

Scott

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