I home brew all my antenna switch boxes. There are many DPDT 12V relays that
will work, including from Radio Shack. I don't think I save any $, but I get
the configuration I want. I like to have several antennas on one band with
the ability to switch in any combination from one to all. I use a single dpdt
12v relay with the 2 poles in parallel and wired so that the antenna is
grounded when not selected or when power is off. I use 24 volts on the line
to overcome resistance and to provide positive switching.
I put everything in a cast aluminum box and mount it to a tower leg for good
grounding. I am convinced this method has helped in the lightning protection
area too. Of course, I dont think it would do much in the case of a direct
hit.
Chuck, KZ5MM
Torres, Jose wrote:
> Hi everyone!
>
> Would appreciate advice on the SELECTION CRITERIA for relays to be used in
> the construction of an antenna relay box. I am into home brewing so not
> interested in of-the-shelve units.
>
> The frequency range is that of amateur HF (160 - 10 meters) and max. legal
> power.
>
> 73 de KP3G
>
> --
> FAQ on WWW: http://www.contesting.com/towertalkfaq.html
> Submissions: towertalk@contesting.com
> Administrative requests: towertalk-REQUEST@contesting.com
> Problems: owner-towertalk@contesting.com
> Search: http://www.contesting.com/km9p/search
--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
Search: http://www.contesting.com/km9p/search
|