[Yaesu] FT-897D jumpers for keying/isolation relay

[Mike Miller]

Hi Mike,

See page 10 of the manual. The CAT/Linear Jack has a TX Gnd pin 
that is an open collector circuit rated at 50VDC and 400mA max. 
I have the FT-857 and have never used this output. I'm not sure 
about the timing of the circuit i.e. will it pull your coax 
relay before RF appears at the coax connector? 

You might want to key the 897 off a contact on the coax relay to 
make sure it has switched before there is RF on the line.

Mike KC9DOA

> I remember seeing somewhere a post about changing a jumper on the
> FT-897D so that the ACC jack provides a collector-to-ground
> circuit (equivalent to a contact closure) when the 897D is in
> transmit mode. I can't find it anywhere in my files, and appear
> to have lost it. 
> 
> I want to use this to drive a coax relay to pull my RFSpace
> SDR-IQ off the antenna line it will share with the FT-897d, so
> that I don't fry the SDR-IQ's front end. Since I'll be using 12V
> to drive the relay, at something like 60 mA, it'll be well within
> what I recall seeing as the max ratings: something like 25 VDC
> and 160 mA, though I Could Be Wrong, 
> 
> I seem to recall that the jumper is 711 or 1711 or 2711, but
> can't be sure, and definitely want to avoid doing anything until
> I have the correct information 
> 
> Can anyone help me? 
> 
> -- 
> Mike Andrews, W5EGO
> mikea at mikea.ath.cx
> Tired old sysadmin 
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