How would the receiving capabilities of this antenna be effected, if at all,
by having the one feedline as opposed to separate feedlines?
Jim W4LC
-----Original Message-----
From: K7LXC@aol.com [mailto:K7LXC@aol.com]
Sent: Sunday, February 03, 2002 1:02 AM
To: ROBKEL@aol.com; towertalk@contesting.com
Subject: Re: [TowerTalk] Question about triband Quad.
In a message dated 2/2/02 6:23:59 PM Pacific Standard Time, ROBKEL@aol.com
writes:
> I have recently put together a 2 element triband quad. 20 & 15 M work
good,
> with a under 2.0:1 over full band (<1.4 over most).
> 10m VSWR is unacceptably high (3:1 or so over full band.
> I have checked all connections and dimensions, all OK. Feed is a single
feed
>
> line through a balun and then a length of 75 ohm twinlead to a common
> connection of all three bands.
> I arranged to isolate just the 10 m DE, and it shows a 2:1 VSWR over
band.
> I was under the impression such antennas were common an presented a good
> match on all bands. I plan to test the balun soon, and also considering
a
> 2:1 W2FMI transformer.
You'll have problems when you feed a quad with the feedpoints tied
together and using one feedline; the 20M loop will radiate when you're on
10M
(14 & 28 mHz). Use 3 feedlines and your problems should be minimized.
Cheers,
Steve K7LXC
Tower Tech
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________________________________________________________________________
Where do you get ICE bandpass filters & beverage matching boxes? The
same place that pays for the hosting of this list: The eHam Store.
Order online at http://store.eham.net.
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