[RFI] Found the every few second beep on 80

[Roger (K8RI)]

On 9/10/2013 5:42 AM, N1BUG wrote:
>> 4 turns on a 2.5 inch long type 31 core does nothing
>
6 turns  of LMR400 on 6 2.4" #31 cores works fine.  You might need a 
little silicone grease for that last turn, but I did them dry. Turn 
diameter is about 5 - 6 inches slightly flattened with no center 
conductor migration.

The photo is of 6T on 5 cores although the one turn is difficult to see.
http://www.rogerhalstead.com/ham_files/AntennaFeed2.htm

73

Roger (K8RI)


> I'm not sure what type of core you are referring to. It sounds like it
> isn't a toroid. However, on a 2.4" OD toroid of type 31 material, 4
> turns would be only a couple hundred ohms at 80 meters, probably not
> enough to do anything useful. You could get upward of 5000 ohms with 14
> turns, assuming you could fit that many.
>
> 73,
>