[TowerTalk] Which Balun with the TH7DXX

[K8RI]

On 7/22/2013 7:14 PM, Bert Almemo wrote:
> 4-5 turns with 4 x 2.4" OD #31 ferrites is more effective than the 30 turns
> on the PVC pipe! Probably double the choking impedance!

I haven't looked the specific number of cores and turns but done 
correctly you should be able to get around 5000 ohms isolation with the 
#31 cores.

73

Roger (K8RI)

>
> 73 Bert, VE3NR
>
>
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Peter
> Voelpel
> Sent: Monday, July 22, 2013 6:55 PM
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] Which Balun with the TH7DXX
>
> A solenoid winding made of coax is more effective then those 4 wraps.
> I use SCF12-50 Cellfex to wind my choke baluns.
> 30 turns on a pvc tube of 4-5" diameter do the trick (2000 ohms at 14MHz).
>
> 73
> Peter
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Jim
> Thomson
>
> ##  coiled up coax is not the answer either, the Z is  too low.   Like
> gerald sez,
> the wire leads on the baluns output is part of the total DE ele  length.
> So if using coax... factor that in...and make the Y the correct length.
>
> ##  4 wraps  of  213 U around   4 x 2.4 inch OD    type 31 ferrite will do
> the trick
> for a balun....
>
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