Topband: Cores and switches

[Tod - ID]

Rick, nice to work you in SS.

I find that the switching is essentially as fast as using the conventional
relays (for my setup).  I have SPDT switches for the relay and the switch
selects between a positive and negative voltage going to the relay.

I suppose that you are using a rotary switch (SPNT) to send power to the
relay you want. If so, it would indeed be a faster change over than the
method I am using. I guess I wish I was cursed with the large area that you
have for those great antennas so this would be more of a problem for me.  Oh
well, maybe in the next life.

73, Tod



> -----Original Message-----
> From: Richard Karlquist [mailto:richard at karlquist.com] 
> Sent: Tuesday, November 18, 2003 9:54 AM
> To: Tod - ID; Topband at contesting.com
> Subject: RE: Topband: Cores and switches
> 
> >  When we are using these cores for receiving, why don't we 
> simply use 
> > latching relays --I do. A single, short, relatively high 
> (40 ma) pulse 
> > is enough to switch the relay state and after that little or no 
> > current is required. By charging a large capacitor to supply the 
> > current and using a series resistor to drop the voltage to the 
> > capacitor one can dump the charge, switch the relay and 
> limit the resting current down the coax line.
> >
> > Tod, KØTO
> 
> In a contest, I am madly trying different beverages when 
> being called by a station in an unknown direction.
> This is easier to do with conventional relays.
> 
> Rick N6RK
>