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

[James C]

Whoops.. stand corrected. Mix 31. My bad. Just mis-typed.  .-James

On Tue, May 7, 2019 at 5:55 PM James C <jabeco at gmail.com> wrote:

> 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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