[AMRadio] remote coax switch


W1EOF w1eof at hamnutz.com
Wed May 10 14:21:20 EDT 2006


I would guess (only a guess) that each one of those pins is a separate relay
coil, powered against the shell/ground. Using an ohmmeter measure from each
of those pins to ground, they should be approx. the same resistance. Apply
power from a variable supply between a pin a ground. Bring the supply up
slowly and check the connection between the common and the outputs at each
step. I think you'll find that at about 20 volts or so the connection will
be made.

73,

Mark W1EOF

> -----Original Message-----
> From: W5OMR/Geoff [mailto:w5omr at satx.rr.com]
> Sent: Wednesday, May 10, 2006 9:37 AM
> To: discussion of AM Radio
> Subject: [AMRadio] remote coax switch
>
>
> I've got a commercially made three position remote coax switch, that I'd
> like to get more information on, if someone has it.
>
> Made by Amphenol
> Model number 3BNI20R10A-7 (don't know if that I is a 1 or not)
> Serial: 6419
> 28 Volts DC
>
> Has 5 connections on it
> 3 BNC (outputs)
> 1 Type N Female
> 1 bluk-head with 3 pins.
>
> Does this mean that if you pulse 28v on one pin, it goes to the right,
> and if you pulse the other 28v pin, it turns to the left, with the last
> pin at ground potential?
>
> Pins are marked A B C
>
> other indentifiers are stamped on the unit...
>
> 300-81128
> IRM5895-717-2565-FX3X
>
> those are stamped on, so may be a local part number, wherever it
> came from.
>
> Any help?  Google wasn't.
>
> --
> 73 = Best Regards,
> -Geoff/W5OMR
>
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