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" <[email protected]> To: [email protected] 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 [email protected]: > Is it fed against a sparse radial system ----- Original Message ----- From: [email protected] To: "ON4GPE" <[email protected]> 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" <[email protected]> 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 _________________ Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband
