| To: | jmaass@columbus.rr.com, topband@contesting.com |
|---|---|
| Subject: | Re: Topband: 160m noise |
| From: | Sinisa Hristov <shristov@ptt.yu> |
| Date: | Wed, 10 Nov 2004 20:03:47 -0500 |
| List-post: | <mailto:topband@contesting.com> |
Jeff Maass wrote: > So, who has *practical* advice of how to apply a choke > for flag/pennant antennas? I've been winding 15-20 turns > of RG8X in an FT240-77 core. With high imepdance antennas one needs much better chokes than with 50-Ohm antennas. I would recommend winding RG174 (or even smaller coax) on FT240-43. You must wind enough turns to position the parallel resonance of the choke near 1.8 MHz. You may need several attempts to get to the right design. Winding it without measuring it is pretty useless. I've described the method of measurement in another message on this reflector few minutes ago. 73, Sinisa YT1NT, VE3EA _______________________________________________ Topband mailing list Topband@contesting.com http://lists.contesting.com/mailman/listinfo/topband |
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