[TowerTalk] M2 20M5 SWR - WX0B SIXPACK

jimlux jimlux at earthlink.net
Fri Jan 1 06:14:54 PST 2010


Steve Katz wrote:
> Hi Bill,
> 
> Remember that we used this stuff mostly in the very cold winter WX for the DX contests and you had the relay boxes mounted in the hallway behind the main shack in a fairly unheated area that might have been cold.  In a warmer climate the RYs might have pulled in easier.  I don't really know, but it's a theory.  :-P
> 
> Steve WB2WIK/6
> 
> 
> 

generally, relays pull in easier when cold, if driven from a constant 
voltage supply.  The resistance of the winding is lower when cold than 
hot, so the current is greater.  There's not any lubricant to get stiff 
or viscous in the cold weather.

(assuming you're not talking -40 sorts of temperatures where the spring 
would start to get brittle)


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