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

[Rob Atkinson]

That AD5X design does not appear to address sequencing at all.

73

Rob
K5UJ

On Sat, Nov 19, 2011 at 10:42 AM, Bob K6UJ <k6uj at pacbell.net> wrote:
> In my regular HF station I have more sophisticated TR switching,  I operate mostly QSK CW so more elaborate
> TR switching is needed.  I recently upgraded my old Alpha 76 workhorse to full QSK with Jennings Vacuum relays and
> timing components to provide the delay needed you are referring to.   It works flawlessly with the Elecraft K3.
>
> Now on my boat anchor station I operate AM only, no amplifier, and the switching is fine with just a DPDT relay setup.
> I used to use, (back in the day, hihi) a dowkey relay with an extra set of contacts which were used for muting the receiver.
> I was planning to find another dowkey to use but discovered the astronomical price for one now so opted to build an
> equivalent TR switch myself and found the nice do it yourself unit designed by  AD5X    http://www.ad5x.com/images/Articles/AntennaRelay.pdf
> It works fine.  I think I will add PTT to the Johnson Viking 2 though.  As I am ragchewing on 75 sitting back in the chair with my feet
> up on the desk holding my D104, it is a little inconvenient to reach over to the Viking and flip the toggle switch to go into transmit mode, hihi
>
>
> 73,
> Bob
> K6UJ
>
>
> On Nov 19, 2011, at 5:36 AM, Rob Atkinson wrote:
>
>> How are you all doing the sequencing of the relays? rx muting
>> (shorting the antenna lead to ground) should be the first thing to
>> happen and the last thing to reverse.
>