[Lowfer] Lo-Medfer Loading Coil

[Warren Ziegler]

Hi Bill,

    Thanks, but  according to the references I've seen, its 6pF/m
rather than 8pF/m.
Yes, its for portable/mobile operation on 500.



On 4/8/09, Bill Ashlock <ashlockw at hotmail.com> wrote:
>
> 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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-- 
73 Warren K2ORS
                WD2XGJ
                WD2XSH/23
                WE2XEB/2
                WE2XGR/1