[AMRadio] Protecting receiver (was WTB: Coax relay, 110VAC, aux contacts)

[Rob Atkinson]

Thanks Bernie, I knew there was a type of coil that did not chatter
but couldn't remember it.

73

Rob
K5UJ

On Sat, Nov 19, 2011 at 4:55 PM, Bernie Doran
<qedconsultants at embarqmail.com> wrote:
> forgot to say, I use all 28 VDC relays, they are cheap surplus and do not
> buzz.
> ----- Original Message -----
> From: "Rob Atkinson" <ranchorobbo at gmail.com>
> To: "Discussion of AM Radio in the Amateur Service"
> <amradio at mailman.qth.net>
> Sent: Saturday, November 19, 2011 2:16 PM
> Subject: Re: [AMRadio] Protecting receiver (was WTB: Coax relay, 110VAC,aux
> contacts)
>
>
> Hi Bernie thanks for this information on switching with a QRO rig.
>
> 73
>
> Rob
> K5UJ
>
> On Sat, Nov 19, 2011 at 11:32 AM, Bernie Doran
> <qedconsultants at embarqmail.com> wrote:
>> yep: On closing the xmit switch, a DPDT, the plate relays are grounded
>> through the second pole. The first control relays are tripped grounding
>> rx,
>> operating mute circuits, shorting speaker, turning on the driver stage,
>> transfering the antenna, starting the Hamsters running on the wheel,
>> etc,etc. and also sending a signal to the plate relays to start them,
>> after a very short delay, first plate relay applies 240 through dropping
>> resistor then second relay closes appling full 240 to the plate xformer.
>> On receive the plate relays drop almost immeadiatly, as does the plate
>> voltage as there is still drive applied because of a small delay in the
>> control relays, they have a nice fat capacator across the coils. The
>> Hamsters head to the water for a drink!! There could also be a set of
>> contacts on the antenna relay in series with the second pole of the DPDT
>> switch to prevent plate operation if the antenna relay did not operate. I
>> have not found that necessary as the xmter shuts down on more safetys than
>> I
>> can count. It is a Gates BC1G.
>>
>>
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