[VHFcontesting] [FFMA] Re: DN03 Grid activation notice - UPDATE - GRIDS ADDED TO TRIP - Now DN02-DN03-DN04

James C jabeco at gmail.com
Tue May 7 20:55:35 EDT 2019


Thanks for the information Jim,

I run a Mix 43 on the DC side for 50mhz. Works great.
Only reason I mentioned chokes was in regards to the 240v AC supply line.
Mix 61 is good for AC and yes, they are placed at the generator.
Everything is common bonded and runs to 3ft of copper coated in the ground
placed at each of the three operating sites.

Thanks again for your input, 73 .-James




On Tue, May 7, 2019 at 5:48 PM Jim Brown k9yc at audiosystemsgroup.com [FFMA] <
FFMA at yahoogroups.com> wrote:

>
>
> #61 material is NOT a good material below UHF.
>
> Based on extensive lab work, the most effective choke for 6M is two
> turns through a #31 core, and use multiple chokes in series. Two turns
> means it goes through the core once. Use multiple 2-turn chokes in
> series on each cable that needs to be choked. Definitely choke the
> antenna at the feedpoint. Note that I'm talking about a core with two
> turns, then a few inches of coax, and another two turn choke, a few
> inches of coax, and another 2-turn choke. Two turns puts the impedance
> peak close to 6M. To kill noise from the generator, do the same, placing
> the chokes right at the generator. With some generators, it also helps
> to bond the frame to a driven rod (if you CAN drive a rod). :)
>
> Do NOT wind two turns and put multiple cores on the same two turns.
>
> 73, Jim K9YC
>
> On 5/7/2019 3:08 PM, James C jabeco at gmail.com [FFMA] wrote:
> > It just stays in the back of the truck, too heavy to move about. choked
> > the 240v line with 4, 1/2", mix 61 ferrite clamps.
> >
>
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