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@gmail.com> To: donovanf@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@starpower.net:
> Is it fed against a sparse radial system
----- Original Message -----
From: donovanf@starpower.net
To: "ON4GPE" <on4gpe@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@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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