Rich,
See e-mail I sent.
*********** REPLY SEPARATOR ***********
On 2/15/06 at 11:58 AM Rich wrote:
>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
>>______________________________
>_______________________________________________
>Amps mailing list
>Amps@contesting.com
>http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|