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

[Rob Atkinson]

Okay right; you need a sequencing circuit--the AD5X thing is basically
a T/R antenna relay.

Take a look at that K4KYV article in ER mentioned earlier or the ramco
sequencing pc card.

http://www.w2drz.ramcoinc.com/Sequencers.htm

These things only switch _relay coil currents_ they are not actual HV
and antenna relays--you slave those to these controllers or even slave
relays that switch 120 v. for the relay that actually does the antenna
etc. switching.  So you have this thing controlling relays that may be
scattered about in other places.  You may need to use shielded line or
put ferrite cores on some relay coil lines if you have a problem with
RF making them chatter.

Alternately, if you never operate in fast break-in mode (I do not care
for it myself) you can do one thing like rx muting manually and the
rest with relays.

73

Rob
K5UJ



On Sat, Nov 19, 2011 at 2:23 PM, Rick Poole <wa1rkt at arrl.net> wrote:
> At 02:01 PM 11/19/2011, Rob Atkinson wrote:
>
>  >>>>>
>>It seems to me that no matter what the receiver is, shorting the
>>antenna jack on its back panel to the cabinet will get the job done
>>along with switching the antenna feedline to the transmitter and if
>>necessary, opening the speaker line or switching to a resistor to give
>>the audio transformer secondary a load.
> <<<<<
>
> Of course.  My point was, one can't do all of that with the AD5X
> design, if the receiver doesn't mute by completing a ground; one will
> have to use something else.
>
>
> ______________________________________________________________
> Our Main Website: http://www.amfone.net
> AMRadio mailing list
> Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/
> List Rules (must read!): http://w5ami.net/amradiofaq.html
> List Home: http://mailman.qth.net/mailman/listinfo/amradio
> Post: AMRadio at mailman.qth.net
> To unsubscribe, send an email to amradio-request at mailman.qth.net with
> the word unsubscribe in the message body.
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>