[Lowfer] Lo-Medfer Loading Coil

[Bill Ashlock]

Warren,

 

What's wrong with doing this the old fashioned way?   Assume C = approx 8pf per meter of antenna length and solve for the inductance (L) to resonate 500KHz using 2pi*f = 1/sq rt (L*C). Comes out a little under 3.5mH. QED!

 

BTW is this for a mobile rig? As in "break, break, old buddy" :)

 

Bill
 
> Date: Tue, 7 Apr 2009 11:08:37 -0300
> From: wd2xgj at gmail.com
> To: lowfer at mailman.qth.net
> Subject: [Lowfer] Lo-Medfer Loading Coil
> 
> Hello the list,
> 
> I am considering building a very small 500kHz vertical antenna (4
> meters) with a loading coil at the base. Modeling the antenna with
> EZNEC I get value of just under 3.5 millihenries for the loading coil.
> Has anyone built a Medfer beacon for the low end of the band and can
> verify this number?
> Thanks,
> 
> 73 Warren K2ORS
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