I ran an SB-220 for about 28 years, the last 20 or so with various Ten-Tecs.
About 10 years ago I got concerned that the SB-220's antenna relay required
switching more voltage and current than the Ten-Tecs might handle without
damage to their amplifier switching relays so I bought the "Soft Key" module
I think it's called from Harbach electronics (now at
http://www.harbachelectronics.com/ ).
I work only CW. I turned the drop-out delay on the rig's amplifier
switching relay to the maximum. When I was sending, I could easily hear any
but the very weakest signal trying to break in. A good effect was that the
overall receiver noise was reduced while sending. I know that the amplifier
was switching "hot" as it went to transmit but that never seemed to make any
difference and in all the time I used it, the amplifier's antenna relay
contacts did not seem any the worse for wear.
Rich Measures has written pretty extensively on the SB-220, including how to
convert it to a full QSK amplifier. You can find his work here:
http://www.somis.org/
73, Mike N4NT
----- Original Message -----
From: "JOHN" <ku3g@yahoo.com>
To: <tentec@contesting.com>
Sent: Saturday, August 06, 2005 11:09 AM
Subject: [TenTec] amps
Does anyone have any info on keyin a sb 200 or sb220 with and omni vi
thanks 73
john ku3g
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