Yes, an optically coupled MOSFET relay will work fine, and is what I use
in my StationPro keying circuit. Two other considerations are the
on-state resistance and the switching time. The PLA140 relay which I use
has a maximum on-state resistance of 8 ohms. Relay data sheets always
include this info.
73,
Jim W8ZR
On 12/28/2016 8:04 AM, ka9egw@ka9egw.com wrote:
You make a good point…but I was thinking a MOSFET-output AC/DC SSR…
*From:*Jim Garland [mailto:4cx250b@miamioh.edu]
*Sent:* Wednesday, December 28, 2016 8:37 AM
*To:* ka9egw@ka9egw.com; amps@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@ka9egw.com <mailto:ka9egw@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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