[Amps] keying issue resolved

[ka9egw at ka9egw.com]

You make a good point.but I was thinking a MOSFET-output AC/DC SSR.

 

From: Jim Garland [mailto:4cx250b at miamioh.edu] 
Sent: Wednesday, December 28, 2016 8:37 AM
To: ka9egw at ka9egw.com; amps at contesting.com
Subject: Re: [Amps] keying issue resolved

 

Better be careful, Brian! Most AC solid state relays use thyristors for
switching and depend on the zero crossing of the AC load to switch off. In
other words, if you try to use one of those relays to key a DC voltage, such
as in the 30L1, it will key up the amplifier but won't turn it off when the
control voltage is removed. Also, if I recall correctly, some solid state
relays have minimum load requirements, which you might not reach with a big
30A power relay. Personally, I think you need a better solution than what
you're intending.
73,

Jim W8ZR




On 12/28/2016 7:17 AM, ka9egw at ka9egw.com <mailto:ka9egw at ka9egw.com>  wrote:

My sincere thanks to all who responded.  After serious consideration I got
inspired to keep it simple-a 240VAC 30A solid state relay with the low side
of the 3-32VDC input pulled to ground by any of several radios will
facilitate keying the +160VDC-keyed-line 30L-1, and also the
6.3VAC-keyed-line Hunter 2000C [which some say is the amp the 30L-1 could
have and should have been], and also the Dow-Key relays on the Heath
Warrior.
 
Thanks to all who responded!
 
73, Brian KA9EGW
 
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