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[TowerTalk] Switching 450 ohm twinlead?

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Subject: [TowerTalk] Switching 450 ohm twinlead?
From: (Patrick Croft)
Date: Fri, 6 Jun 1997 13:54:57 -0400 (EDT)
Before you spend $65 PER RELAY, suggest doing a little snooping about the
other various surplus houses - Fair Radio in Lima, Ohio would be one
suggestion.  Bob Grinnell's Surplus Sales is the LAST stop unless one has
more money than.....



>>Re all the recent posts about the RCS8V coax switch.  How is the best way
>>to remotely switch 450 ohm twinlead?  I will have 3 arrays which are fed
>>with twinlead.  I want to individually switch these to an outside remote
>>matching unit...-snip- 
>>Anyone have any
>>experiences or thoughts on this?  Does anyone (Antenna Mart, Dunestar,
>>etc.) make such a unit?
>Aloha Henry,  
>The relay you want and need is at Surplus Sales of Nebraska.  I just
>bought two of them for switching my four v-beams planned for set-
>up this Summer.  The perfect unit,  ceramic bases, is an Advance
>Relay,  built by the Elgin National Watch Campany (years ago!).  
>       Model AT/2C/115VA  DPDT
>The ceramic base is 2 1/2 by 3 1/2 inches by 1/4 in thick.
>The ribbon lead which carries each side of the 450 ohm 
>circuits are about 1/4 inch wide and spaced 2 inches inside 
>edge to inside edge of the ribbon.  Will certainly carry the
>Pout of my 87A (but don't try hot switching!).
>There can be no "bump" of impeadance using these that will amount
>to any problem.  Only caveat is the use of 115VAC coils,  but
>not a big deal. All the coax antenna relays etc. of the '50's
>were also using 115VAC,  E.F.Johnson used them in the KW
>Matchbox'x for example.  I paid $65 each for the relays,  and
>was thrilled when I saw the quality of construction!!
>Send an e-mail to Bob Grinnell at Surplus Sales, Nebraska:
>and he can tell you how many he has left,  etc.
>Good luck on your project!
>73,  Jim, KH7M
>On the Garden Island of Kauai
>FAQ on WWW:     
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