[Lowfer] Active Ants Redux

[Bill Ashlock]

Jay,

>I've built and use three of the of AMRAD original e probes with the high
>power CP666 FET. I experience no overload at this location with the 
>strongest
>signal being WTIC 1080 kHz at about 10mV/meter.

That's considered a 'quiet environment' compared to this area. :)  If I hang 
a scope probe connected to a 1 meter rod I see about 600mv of WRKO 680 kHz! 
BTW, the scope makes a pretty good 'poor-mans' spectrum analyzer once you 
get used to spotting the significant signal frequencies in what looks like a 
video of an explosion in a spaghetti factory. :)

>The data sheet for the CP666 indicates a 1 dB compression level of +25 dBm 
>and a 3rd order >intercept of +40 dBm. No second order IMD spec is given. 
>The J-310s amplifiers I've built
>for higher frequency applications have typical 1 dB compression of about 0 
>dBm and a third order >intercept of +12 to +15dBm. This would indicate 
>about a 20 dB advantage for the CP666 which >seems about right with the 
>amplifiers I've built.

This is all well and good but I'm looking for a test procedure that allows 
us to test our newly constructed E-probes and place a figure of merit on the 
intermod performance. You know: like the Rac value for our TX loops or the 
total system resistance for our verticals!! (Signal reports are secondary to 
this .... right? <G>)

Bill

_________________________________________________________________
MSN 8 helps eliminate e-mail viruses. Get 2 months FREE*.  
http://join.msn.com/?page=features/virus