[Yaesu] ft-726r question

[Scott Townley]

It depends (not intimately familiar with the '736).
If the outgoing PTT is driven by a relay contact closure, then yes, you=20
will measure a near-zero-ohm resistance.
BUT if the outgoing PTT is driven by a saturated transistor, then you will=
=20
measure a non-zero resistance...sometimes in the hundreds of ohms!
The key is, "is the PTT resistance *small enough* to cause the=20
relay/switching device in the amp to close?"  Sometimes it isn't,=20
especially if the downstream switching device is electronic (rather than=20
mechanical).  The only way to know for sure is (1) try it or (2) get the=20
schematic and do some calculating.  (1) is obviously much easier.

At 17:42 2003-08-17, YASH@aol.com wrote:
>Made a break out box for trigering the transmit relay on each of my 4=20
>outboard amps. used a small enclosure with 4 rca jacks. eack jack wired{=20
>center pin} to the correct pin on the din plug and all the common grounds=
=20
>to pin 1 on the din plug. plugged it into the 736r and figured when I hit=
=20
>the ptt on the mic the ohm meter should show a solid short across the rca=
=20
>jack... not so,  shows  the circuit is not a dead short to ground,but=20
>having a floating resistance, short of a dead ground . The directions are=
=20
>on page 20 of the manual.. Iam I reading these wrong ? I figured when the=
=20
>ptt is hit the rca's should show a dead short to ground.
>any help ,would be greatful.
>take care
>dale k8peo
>
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Scott Townley NX7U
Gilbert, AZ  DM43di
http://members.cox.net/nx7u