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Old February 27th 05, 04:47 PM
Jerseyj
 
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Default MFJ 1798 Vertcal

Wonder If anyone has any experience with this vertical...the specs says
it works without radials,I'm just wonderng how well.

Jerry
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Old February 28th 05, 12:19 AM
 
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Jerseyj wrote:
Wonder If anyone has any experience with this vertical...the specs

says
it works without radials,I'm just wonderng how well.

Jerry

Hi Jerry, Let me first say that I have never used a 1798, but can
offer some comments for what they are worth.
I have seen the 1798 at hamfests. It is large, and although 20'
tall, it will require guying, and a sturdy bottom support. It will
require a lot of assembly and tuning time. It costs $300.
As for performance, a low dipole, or inverted vee (30'-35') will
probably exceed the 1798 on 80m and 40m. 20m-10m toss-up. 6m and 2m??
As a less expensive alternative, a 100' dipole or inverted vee fed
with 450 ohm ladder line and an antenna tuner will provide equal or
better results 80m-10m. 6m and 2m require additional attention. Since
you will need to guy the 1798, the space required will be larger than
you think.
Gary N4AST

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Old February 28th 05, 02:35 AM
Charlie
 
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You might want to consider the Hustler 4,5 or 6 - BTV. Requires no guying
and is easy to assemble (30 mins) and tune (15mins). It is sleek in
appearance and with ample radials it is a very usable DX antenna on all it's
bands.

1. http://www.ad5th.com/5-BTV.html
--

Charlie
Ham Radio - AD5TH
www.ad5th.com
Live Blues Music
www.492acousticblues.com




wrote in message
oups.com...

Jerseyj wrote:
Wonder If anyone has any experience with this vertical...the specs

says
it works without radials,I'm just wonderng how well.

Jerry

Hi Jerry, Let me first say that I have never used a 1798, but can
offer some comments for what they are worth.
I have seen the 1798 at hamfests. It is large, and although 20'
tall, it will require guying, and a sturdy bottom support. It will
require a lot of assembly and tuning time. It costs $300.
As for performance, a low dipole, or inverted vee (30'-35') will
probably exceed the 1798 on 80m and 40m. 20m-10m toss-up. 6m and 2m??
As a less expensive alternative, a 100' dipole or inverted vee fed
with 450 ohm ladder line and an antenna tuner will provide equal or
better results 80m-10m. 6m and 2m require additional attention. Since
you will need to guy the 1798, the space required will be larger than
you think.
Gary N4AST



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Old March 1st 05, 01:32 AM
Jerseyj
 
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In article ,
"Charlie" wrote:

You might want to consider the Hustler 4,5 or 6 - BTV. Requires no guying
and is easy to assemble (30 mins) and tune (15mins). It is sleek in
appearance and with ample radials it is a very usable DX antenna on all it's
bands.

1. http://www.ad5th.com/5-BTV.html
--

Charlie
Ham Radio - AD5TH
www.ad5th.com
Live Blues Music
www.492acousticblues.com


Hi there,
I looked at the 6-BTV as a possibility, doesn't do 12M but otherwise
looks interesting, also requires radials which the MFJ does not...looks
like you do blues music too, I play a little harp *smile*, or used to.
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Old March 8th 05, 11:52 PM
Jim
 
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Jerseyj wrote:
Wonder If anyone has any experience with this vertical...the specs says
it works without radials,I'm just wonderng how well.

Jerry

Have owned and used an Vectronics 895 which identical to the MFJ 1796
which in turn is the 40 meter through 2 meter antenna from MFJ.

It needs no radials since it is essentially a shortened,
vertically-mounted dipole with a sort of funky looking porcupine-like
device on each end to load it.

When we were thinking about selling the house a 10 years or so ago I
took my roof top tower and yagi down. When we decided not to sell I
wanted to get on the air with something and put up the Vectronics on a
pole supported at the house eaves. It stood like that for about five
years. No problem with wind damage during that time.

My opinions.
1. It is adequate though awkward to tune the antenna for HF well. You
have to adjust the length of the porcupine quills, so to speak. (My
solution -- tune as close as is reasonable and then use an antenna tuner).
2. Performance is typical of a vertical that is okak keeping in mind
the old adage that a vertical is an antenna that radiates equally poorly
in all directions.
3. The 6 and 6 meter antenna pieces are threaded aluminum rods that are
tuned by screwing them into steel nuts. Aluminum on steel binds and no
lube that I found let me adjust them adequately.

Anyway, took the Vectonics now and have the yagi tribander back up, plus
a G5RV.

Jim, WD9FRF
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