[Heathkit] Amp Keying

[jeremy-ca]

Around 60ma at 125VDC. Way too much for any SS switching in a xcvr and even 
for small relays used in some 80's xcvrs.

Ive not opened up SS relays but they probably use a fet. The problem is that 
they are not good at most RF frequencies and are biased hard on/off which to 
my way of thinking will cause all sorts of non linear crud to be generated. 
To say nothing about their VSWR characteristics.

I use a Dow-Key transfer relay at 1500W on 2M and I can barely hear it over 
the blower noise (;  On higher bands I use Transco units.

Now I have to find my old Dow Key with contacts to use with a Viking I and 
HQ129X for the Ayem station.

Carl
KM1H

----- Original Message ----- 
From: "Dennis Berry" <dennisberry at worldnet.att.net>
To: <heathkit at mailman.qth.net>
Sent: Tuesday, July 31, 2007 8:00 PM
Subject: [Heathkit] Amp Keying


I'm sure someone knows this.  What current does the relay need in the SB-200 
and SB-220?  With all the discussion, it would be interesting to know if 
someone has measured the current requirements of the relays, as I'm sure 
someone has?

Also, the solid state relays have been mentioned.  I've not used one.  Do 
these behave like regular relays so that the difference in voltages (DC, 
negative switching on the SB200, positive on the SB220) will make no 
difference to the relay?  It acts just like a contactor?

Thanks in advance...

dennis
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