An UN-UN is un balanced to unbalanced. Is that what you have ? A vertical is unbalanced. Willy In a message dated 5/30/2015 12:02:54 P.M. Eastern Daylight Time, [email protected] writes:
Send Topband mailing list submissions to [email protected] To subscribe or unsubscribe via the World Wide Web, visit http://lists.contesting.com/mailman/listinfo/topband or, via email, send a message with subject or body 'help' to [email protected] You can reach the person managing the list at [email protected] When replying, please edit your Subject line so it is more specific than "Re: Contents of Topband digest..." Today's Topics: 1. vertical balun (Bob Kupps via Topband) 2. Re: vertical balun (shristov) ---------------------------------------------------------------------- Message: 1 Date: Fri, 29 May 2015 21:13:50 -0700 From: Bob Kupps via Topband <[email protected]> To: topband <[email protected]> Subject: Topband: vertical balun Message-ID: <[email protected]> Content-Type: text/plain; charset=us-ascii Hi we have a 30m top loaded monopole with the feed point about 2m above a large ground radial field. Right now we are feeding it through a 4:1 balun (not a unun) with 12.5 ohms on the balanced side, and the SWR is 1.4 with no matching network. Is this balun acting as a common mode choke? Do we even need a choke? Would an unun be better? Thanks 73 Bob HS0ZIA ------------------------------ Message: 2 Date: Sat, 30 May 2015 06:40:14 +0200 From: shristov <[email protected]> To: topband <[email protected]> Subject: Re: Topband: vertical balun Message-ID: <[email protected]> Content-Type: text/plain; charset=us-ascii Bob Kupps wrote: > Right now we are feeding it through a 4:1 balun (not a unun) with 12.5 ohms on the > balanced side, and the SWR is 1.4 with no matching network. You should get quite a reasonable SWR with no matching at all. A good high-impedance common mode choke is recommended. 73, Sinisa YT1NT, VE3EA ------------------------------ Subject: Digest Footer _______________________________________________ Topband mailing list [email protected] http://lists.contesting.com/mailman/listinfo/topband ------------------------------ End of Topband Digest, Vol 149, Issue 17 **************************************** _________________ Topband Reflector Archives - http://www.contesting.com/_topband
