Will and all.
I will only be using the amp/relay set up for SSB operation and I though
I had read somewhere that the antenna switching had to be done before
the bias was changed so the I did not think the delay was a problem but
a plus and would make it safer for the tube and amp. Also I already have
several 120vac 10amp DPDT relays on hand. I have the relays already
mounted on a sheet of alum with the 12vdc powered by the radio supply
and will be switched by the radio/amp relay. The 75vdc supply is
complete and mounted by the relays. I do have one 3PDT but I did not
think the RF should be through the bias relay? The more I read the more
confused I get.
Rich, kd0zz
From: "Will Matney" <craxd1@verizon.net>
Rich,
Well the only problem will be the time delay of one relay switching
another. The diode can be a 1N4004-1N4007 and the cathode goes toward
the supply side of the coil (the other way shorts the coil out). The
switching side of the coil goes to the n/o contacts on the small
switching relay. If I were going to control the bias on/off with a
relay, I'd use a 3PDT for the antenna relay, and use the 3rd contact set
for this similar to what Heath and others do.
Best,
Will
*********** REPLY SEPARATOR ***********
On 2/14/06 at 7:17 PM Rich wrote:
>I am bread boarding my relay set up for the amp I am building. The
>first one is a small 12vdc coil relay that will be actuated by the
>radio, this will switch 75vdc to the next relay, it has a 120vac coil
>that will switch the input from antenna bypass to the grid drive... My
>question is, does it make and difference how a diode is put across the
>input of the coil? Any particular size or type diode? I plan on this
>relay to also energize 75 vdc to the next relay for the bias change. Do
>I have it right in my mind ? Antenna first , then it trips the bias
>relay. I also plan on putting in a foot switch so I only will use the
>amp to make contact in a contest as required.
>
> Rich , kd0zz
>______________________________
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