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) <[email protected]> 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 > > > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband > _________________ Topband Reflector Archives - http://www.contesting.com/_topband
