Topband: Common mode choke 160m inverted L

[donovanf at starpower.net]

Hi Gurt, 


With only two radials on your inverted-L, you should use a good 
common mode choke on your coax. 


The W2DU style choke on only one meter of RG-393 will not be 
very effective 


Suggest you read this excellent reference: 


http://k9yc.com/CoaxChokesPPT.pdf 


73 
Frank 
W3LPL 








From: "ON4GPE" <on4gpe at gmail.com> To: donovanf at starpower.net 
Sent: Saturday, December 23, 2017 7:06:48 PM 
Subject: Re: Topband: Common mode choke 160m inverted L 

Hi Frank, 

Yes only two 1/4 wave elevated radials (3 meter high), it's not possible 
to use ground radials. 

73 


Op 23/12/2017 om 19:30 schreef donovanf at starpower.net: 
> Is it fed against a sparse radial system 

----- Original Message -----

From: donovanf at starpower.net 
To: "ON4GPE" <on4gpe at gmail.com> 
Sent: Saturday, December 23, 2017 6:30:35 PM 
Subject: Re: Topband: Common mode choke 160m inverted L 


Hi Gert, 


What are you trying to accomplish with a common mode choke 
on your inverted-L? Is it fed against a sparse radial system? 


73 
Frank 
W3LPL 

----- Original Message -----

From: "ON4GPE" <on4gpe at gmail.com> 
To: 
Sent: Saturday, December 23, 2017 6:27:41 PM 
Subject: Topband: Common mode choke 160m inverted L 

Hi All, 

I would like to build a good high power common mode choke for 160m. 
I have a piece of RG393/U ptfe 10mm coax. (1 meter) 
I was thinking of using this and make me a "W2DU style" choke. 
Searching for the ferrite cable cores, i found on the Mouser website 2 
types which would fit: 

Fair-rite 31 material : https://www.mouser.be/ProductDetail/623-2631626402 
Laird LF material : https://www.mouser.be/ProductDetail/875-LFB187102-000 

Laird got a higher impedance at 1.8 Mhz. 

I think a lot of ham's on this topband reflector got more experience, so 
what's your advice ? 

Thanks, Gert ON4GPE 
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