[Towertalk] 80M vertical bandwidth question

[n4kg@juno.com]

Why only 2 (slightly elevated) radials?

I have 10 radials at 15 ft on my Reverse Fed Elevated GP
which seems to play quite well.

I also have a wire vertical in the woods using a half-Bow Tie radiator
for better bandwidth.  It is tuned for CW.

I get a 'double dip' in SWR by feeding with 1/4 WL of RG58 (50 ohm)
followed by several hundred feet of half inch CATV Hardline.  SWR
is roughly 1.3 at 3.5 MHz and 1.5+ at 3.8 (and higher in between).

Tom  N4KG

On Thu, 16 Jan 2003 23:14:34 +0000 "RICHARD BOYD" <ke3q@msn.com> writes:
> I'm working on an 80M vertical, fullsize, with two elevated radials.  
> The 
> feedpoint is about 8' above the ground and the radials slope down 
> slightly 
> to 5' at the tie-offs.  I cut each of the wires for 70' to start 
> with, to be 
> able to prune.  It does, in fact, resonate below the band as I 
> expected.  
> I'm getting 290 kHz as the "low SWR" bandwidth -- that is, where the 
> "hi 
> SWR" indication does not come on on my FT-847 that I took portable 
> running 
> on a battery out to the base of the vertical.  I suppose that's 2:1 
> SWR 
> bandwidth but I guess I'd have to check my FT-847 manual to see.
> 
> Two questions:
> 
> 1.  What is the "high SWR" bandwidth of a radio like the FT-847?  
> 2:1?
> 2.  Is 290 kHz SWR bandwidth typical?  I was kind of surprised it 
> was that 
> good.
> 
> 73 - Rich, KE3Q
> 
> 
> 
> Rich Boyd
> 
> 
> KE3Q/W3AO
> 
> 
> 
> 
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