[TowerTalk] Question about triband Quad.

[Ed W3NR]

I for one, highly recommend a trip to W4RNL's web site and read 
his articles on quads. He presents quite a bit of useful 
information about this subject.

Ed W3NR


2/5/02 9:38:16 AM, "Brown, James E LRDOR" 
<James.E.Brown@lrdor.usace.army.mil> wrote:

>
>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
>
>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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