Although Ten-Tec specs the key line voltage at low DC voltage for warranty
purposes, the TO-220 style keying transistor in the Pegasus is actually
speced to handle well over 100VDC, but I don't recall if it's rated to 170
V. My Pegasus keys my ALPHA SEVENTY amplifier with a 70V key line and I
have no trouble.
Harbach engineering sells the most elegant solution for your SB-220. From
the Harbach web page at:
http://www.harbachelectronics.com/reference/harpg3cart.htm
"SK-220 SOFT-KEY MODULE - The SK-220 is an interface module which allows
your transceiver to key the SB-220 seeing only 0.7 volts at 1.5 mA. The
original SB-220 circuit had +120 volts on the keying line. This easily
installed unit is only $20.00 with $1.20 sales tax for Indiana residents."
Another solution is to build or purchase an external interface unit with a
HV Darlington switching transistor. Someone just recently came out with a
nice, opto-isolating all-in-one amplifier interface and I just can't recall
who it is. Perhaps someone can chime in and help me with my memory.
-Paul, W9AC
----- Original Message -----
From: "Wayne" <aa5jj1@cox.net>
To: <tentec@contesting.com>
Sent: Tuesday, February 25, 2003 21:06 PM
Subject: [TenTec] Pegasus and Heathkit SB220 amp
I have a Heathkit SB220 2KW PEP amp and I have been using it on a Kenwood
with a external keying relay to protect the rig form the 170 volts that
comes out of the keying realy in the SB220, The Pegasus can not us this and
I am not sure how to use the Pegasus with my SB220 amp......Please Help
Thanks Wayne AA5JJ
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