[TowerTalk] Relays

[Red]

1500 watts at 50 ohms gives 274 volts.  That could be 548 volts if the 
SWR is 2:1.  Current at 1500 watts and 50 ohms is 5.5 amps, 11 amps at 
2:1.  Give them a fair margin for reliability, as much as 2:1, so get 
1100 volt 22 amp relays.  Not trivial at 1500 watts!

73 de WOØW

Mikael Larsmark wrote:

>Hello!
>
>I wonder what kind of relays should I pick when building antenna 
>switches. The coax relays are to expensive so that is not an option.
>
>I have actually used car relays for a while and they seem to work 
>quite ok. I would like to know though what ratings should I suppose 
>to look after? How many amps, the width between the "connectors" 
>etc. should they handle? Of course this depends on how much 
>SWR and power I'm using but if I say that they should handle 
>1.5kW and an SWR of 2:1, atleast!?!
>
>//Mike (SM3WMV // SM3W)
>
>
>_______________________________________________
>
>See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
>
>_______________________________________________
>TowerTalk mailing list
>TowerTalk at contesting.com
>http://lists.contesting.com/mailman/listinfo/towertalk
>
>
>  
>