At 05:24 AM 3/23/04 +0000, you wrote:
>Does anyone know if anyone makes a SP4T 12vdc switch that is N.C.? I
>looked on the net found some Dowkey type switchs but all of then are
>N.O. A buddy of mine gave me an old Super Scanner antenna 3 beam and
>the relay box fell apart. It had these little 3amp icecube relays to
>turn off 2 of the elements. 1 would be the radiator and the other 2
>would be reflectors giving a 120 deg beam. With all of the elements
>driven it would be omni. I think I need the 4th post on the switch
>for a tuning stub for the omni mode. Also can these switchs be mount
>at the antenna or do they need to be put in a waterproof box? Here
>is a link for the manual
>http://cbtricks.com/ant_manuals/ant_spec/super-scanner.pdf
>
>Thank for any help
>Steve
To duplicate the relay box you will need one
of the following collection of relays:
Option one:
one SPDT relay
two DPDT relays
The DPDTs will be hard to find (read: expensive)... so
to duplicate the functionality of the DPDT you could use
a paid of SPDT with the coils wired in paralell.
Hence option two:
five SPDT relays.
And for 5w at 27mhz you don't need a coaxial relay - a home-
made PC board and a handful of ice-cube relays will work just
fine. They will last longer of you switch them only in receive mode.
Mike
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