[Milsurplus] A Ham Radio Math Quiz

[WA5CAB at cs.com]

Sorry, Hue, but that may not be true.  Dave never has said what transmitter 
he's playing with.  But if it is, as a couple of others have assumed 
(including me I guess) a pre-WW-II military set, it was not designed to work into 
anything with anywhere near as high a radiation resistance as 50 ohms.  If 
there was a Phantom Antenna designed for use with it, that's almost certainly 
true.  In most cases, the intent of the Phantom Antenna was to allow the 
crew to retune the transmitter to a different frequency without radiating.  50 
ohm dummy loads are a child of the 50's and later.

In a message dated 4/3/2010 11:37:55 PM Central Daylight Time, 
kargo_cult at msn.com writes: 
> Why are you using a phantom antenna? Are you in fact going to be using a 
> short
> wire antenna, and not a resonant dipole type? You could as well tune up to 
> a 
> 50
> ohm resistor and measure the voltage across it. That will tell you if your
> transmitter is working up to spec. The short wire antenna will be less
> efficient.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480