Topband: Two wire beverage question

[Guido Tedeschi]

With that trick, you can switch four directions using only one single 
coax cable, two RBS-1P and another relay that is switched with +12Vdc 
and 9Vac.
With 0V and -12V you control one RBS1-P, with 9Vac and +12V you select 
and control the other RBS1-P
73 de Guido, ik2bcp

Il 24/03/2012 13:03, Kenneth Grimm ha scritto:
> Thanks very much Guido!  That is the answer I was looking for.  I had 
> forgotten about the use of AC in switching.  Now that you have told 
> me, it is obvious!   Thanks again OM.
>
> 73,
>
> Ken - K4XL
>
> On Fri, Mar 23, 2012 at 6:46 PM, Guido Tedeschi <guidoted at gmail.com 
> <mailto:guidoted at gmail.com>> wrote:
>
>     Il 23/03/2012 16:10, Kenneth Grimm ha scritto:
>     > Both of these boards appear to have an electrolytic capacitor
>     > installed.  On both boards the electrolytic appears to be
>     associated with
>     > the direction switching relay.  None of the two wire beverage
>     diagrams that
>     > I have seen have such a cap and I wonder what its function is
>     and how it is
>     > connected in the circuit.  I am told that the value is 100 mfd @
>     50 volts.
>     >
>     > Apparently the cap isn't necessary, but since I have a few in my
>     junk box,
>     > this might be an opportunity to put one of them to use!
>     >
>     If you are talking about the RBS-1P, the electrolytic  capacitor is
>     connected in parallel with the relay coil (positive terminal of
>     capacitor connected to ground), after the diode with anode
>     connected to
>     the relay, and it is needed because you can switch the direction also
>     with an AC voltage (about 8-9Vac).
>     If you will never use an AC voltage but only -12Vdc, the capacitor is
>     not needed...
>     73 de Guido, ik2bcp
>
>     _______________________________________________
>     UR RST IS ... ... ..9 QSB QSB - hw? BK
>
>
>
>
> -- 
> Ken - K4XL
> BoatAnchor Manual Archive
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>