[500kc] [Lowfer] Re: AMRAD Probe antenna part needed

[riese-k3djc at juno.com]

Dick mentioned that he had a mini probe to loan
will have to go mobile with the SDR and a lap top
to see what it hears

Bob 

BTW

there are many code copying programs that work well and it helps me to
use that to improve
your proficiency,, http://www.saharlow.com/technology/sigmira/index.htm
if you have
an SDR this program works well and has a code decode part that does OK
I can copy W1AW with this locked on it and see if I can get the letter
just before the
program does

the other issue is the ability to copy then requires to learn
the language and that can be an issue. 



good the see that you are plugging away at it




 Thu, 12 Jun 2008 16:20:17 -0400 Bill Ashlock <ashlockw at hotmail.com>
writes:
> 
> > does the shorter mobile coax feed mess up the performance  Bob 
> K3DJC 
>  
> Bob, it actually it does not. With a probe at a fixed location it's 
> not really the coax length that counts but the amount of capacity 
> coupling it offers to ground. (This does not hold, however when you 
> raise the antenna to a higher location above gnd and take advantage 
> of a larger effective antenna length) The capacity to gnd needs to 
> be somewhat greater than the capacity of the probe to ground 
> (something like 8.85 pf per meter of antenna rod length). The car 
> body and capacity coupling from there to ground makes this an 
> excellent mobile antenna as long as you stay away from power lines 
> and other E-field interference sources. Also the trees have a 
> shielding effect and you need to be at least 100ft from them. If 
> memory serves the gain is something like 6 db over a vertical probe 
> placed right at ground level which has a 1uv per meter of antenna 
> length sensitivity. I used this type for many field strength 
> readings back in my loop radiation investigation days. (Which 
> reminds me I need to get back to this at 500K)
>  
> Bill_______________________________________________
> >From the Lowfer mailing list
> Send messages to: Lowfer at mailman.qth.net
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> 
> 
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