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echo: ham_tech
to: JEFF EDMONSON
from: ROB DENNIS
date: 1997-07-12 07:27:00
subject: J-Pole antenna

 >> Give a few people some ideas and antennas sprout like flowers.
 JE> With such abnormal antenna weather*, it might be something to post along
 JE> the lines of Antennas for HF, too.
 Mobile or fixed antennas for HF?
 I'm gearing up to go HF mobile on 80 and 160 later this summer when I get an
HF rig for the truck.
 The antennas are a Hustler RM-80-S on 80m,around 3.750 - 3.805 and a HUGE 
160m coil for 1.840 - 1.875.
 IF I can wangle the deal I'm going to be using an old Atlas HF mobile a 
friend of mine is getting rid of that covers 160-20m.
 JE> Here's some antenna discussion fodder:
 JE> A typical dipole cut for the lowest frequency you plan on working
 JE> (ie: 80m)
 JE> |-+--+--+--+--+--+--+---| |-+--+--+--+--+--+--+--+-|
 JE>                         | |  <--Feedline
 JE>                      ___|_|___
 JE> |-+--+--+--+--+--+--+---| |-+--+--+--+--+--+--+--+-|
 JE>          |              | |                 |
 JE>                         | |   <--Feedline
 JE>                      ___|_|___
 JE> Above, the same 80m dipole with 40m 'tassles' installed.
 JE> Am interested in hearing from anyone why they think this will/will not
 JE> work.
 Seems to be similiar to an `angel-wings' antenna Wayne discussed before.
 One co-ax and multiple tuned dipoles from the same feed-point.
 Myself I have B&W trapped dipole for 160m thru 20m that works out perfectly
flat at 1.855 and 3.700. 40 and 20 I'm not worried about at the moment 'til I 
get the 12wpm cw.
--- GoldED 2.42.G1219
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* Origin: VE3SJN....Moderator....HAM_TECH (1:163/506.4)

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