Doug -
Your FT-747 only has one antenna input. It does not have a second
receiver. It doesn't even have a receive-only antenna input. You cannot
transmit and receive at same time. Why do you need a "front end saver"?
If you are adding an outboard relay keyed from the amp control line of
the FT-747 to allow you to have separate transmit and receive antennas,
that's great. Any old relay with less than 10ms make/break time will work
fine there. You still don't need a "front end saver", because your rig
still cannot be hooked to both transmit and receive antenna at same time.
Tim N3QE
On Sat, Aug 29, 2015 at 12:15 PM, Douglas Ruz (CO8DM) <co8dm@frcuba.co.cu>
wrote:
> Hi Martin, OK1RR,
>
> I tried email direct to you but it was not possible. I am sorry about the
> other member of the list.
>
> It is about the FRONT END SAVER relays:
>
> I have two different relays here and i would like to know if i can use one
> of them in
> your design:
>
> I have HFD2 Subminiature DIP relay:
> -Matching standard 16 pin socket.
> -DPDT
> -100 million operations
> - Operate time 4ms and release time 3ms.
> -Capacitance: Contact to coil 5pF and contact set to contact 1,5 pF
>
> I have also HFD41 relay:
> -SPDT relay
> -10 million operations
> -Operation time 10mS
> -Not sure about capacitance.
>
> Maybe i have to RE-DESIGN the PCB but that is very easy.
>
> Any idea???...Thanks,
>
> 73....Douglas, CO8DM
>
>
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