Saffer wrote in news:Saffer.709bc28
@radiobanter.com:


Cecil Moore;721366 Wrote:
On Oct 23, 1:57*am, Saffer wrote:-
Hi there Im new to amateur just got my licence and am having high swr
problems ive checked the coaxial cables for continuity and everything
seems to be right the antenna is a buddipole and everything has been
assembled correctally can anybody tell me what I might be doing wrong-

Same on all bands with the proper coil-taps/whip-sections selected?
--
73
Yes pretty much the same on all bands I think I might have solved my
problem the transceiver was not grounded sufficientally and when I did
this the swr came down on all bands expecting part of 40 is it correct
to say that swr is affected by station grounding ?

Ideally, the coax would carry negligible common mode current and you
would not notice such an interaction.

The Buddipole should be used with an effective balun. My preference would
be a current balun with a high choking impedance, but IIRC that is not
what Buddipole recommend.

Let the coax fall to the ground vertically, and route it away from the
antenna at right angles to minimise coupling.

VSWR will be poor on the lower bands (80, 40) if you do not have the
variable ratio balun, and set it appropriately.

You are really shy on details (eg we have as good as begged you to
quantify 'high'), so you get brief answers. Describing the problem well
to yourself is the first step in resolving it.

Owen

On Oct 24, 6:49*am, Owen Duffy wrote:
Saffer wrote in news:Saffer.709bc28
@radiobanter.com:



Cecil Moore;721366 Wrote:
On Oct 23, 1:57*am, Saffer wrote:-
Hi there Im new to amateur just got my licence and am having high swr
problems ive checked the coaxial cables for continuity and everything
seems to be right the antenna is a buddipole and everything has been
assembled correctally can anybody tell me what I might be doing wrong-

Same on all bands with the proper coil-taps/whip-sections selected?
--
73
Yes pretty much the same on all bands I think I might have solved my
problem the transceiver was not grounded sufficientally and when I did
this the swr came down on all bands expecting part of 40 is it correct
to say that swr is affected by station grounding ?

Ideally, the coax would carry negligible common mode current and you
would not notice such an interaction.

The Buddipole should be used with an effective balun. My preference would
be a current balun with a high choking impedance, but IIRC that is not
what Buddipole recommend.

Let the coax fall to the ground vertically, and route it away from the
antenna at right angles to minimise coupling.

VSWR will be poor on the lower bands (80, 40) if you do not have the
variable ratio balun, and set it appropriately.

You are really shy on details (eg we have as good as begged you to
quantify 'high'), so you get brief answers. Describing the problem well
to yourself is the first step in resolving it.

Owen

I tried one a few years ago to use when I go camping. Having a hot
shield did prove to be problematic. This also got it retired to the
junk bin. My favorite antenna for camping is an NVIS antenna that
takes the form of a wire Yagi-Uda aimed skyward. All I need to put it
up is a couple of suitably spaced trees.

Jimmie

On 10/28/2010 7:46 PM, JIMMIE wrote:

I tried one a few years ago to use when I go camping. Having a hot
shield did prove to be problematic. This also got it retired to the
junk bin. My favorite antenna for camping is an NVIS antenna that
takes the form of a wire Yagi-Uda aimed skyward. All I need to put it
up is a couple of suitably spaced trees.

Jimmie

What band?

Care to share any details? Sounds like something fun to make.

tom
K0TAR

On Oct 28, 9:40*pm, tom wrote:
On 10/28/2010 7:46 PM, JIMMIE wrote:



I tried one a few years ago to use when I go camping. Having a hot
shield did prove to be problematic. This also got it retired to the
junk bin. My favorite antenna for camping *is an NVIS antenna that
takes the form of a wire Yagi-Uda aimed skyward. All I need to put it
up is a couple of suitably spaced trees.

Jimmie

What band?

Care to share any details? *Sounds like something fun to make.

tom
K0TAR

http://www.hamuniverse.com/nvisbeam.html

This is where I got the idea, Lots of other info on various designs
just by googling NVIS antenna. I usually do 40M as the antenna for 75M
is often impractical to put up but I have one just in case. There is
one place I could probably put up one for 75 over a pond.

Jimmie

On 10/29/2010 4:21 PM, JIMMIE wrote:

http://www.hamuniverse.com/nvisbeam.html

This is where I got the idea, Lots of other info on various designs
just by googling NVIS antenna. I usually do 40M as the antenna for 75M
is often impractical to put up but I have one just in case. There is
one place I could probably put up one for 75 over a pond.

Jimmie

Thanks.

tom
K0TAR

On Oct 29, 7:34*pm, tom wrote:
On 10/29/2010 4:21 PM, JIMMIE wrote:



http://www.hamuniverse.com/nvisbeam.html

This is where I got the idea, Lots of other info on various designs
just by googling NVIS antenna. I usually do 40M as the antenna for 75M
is often impractical to put up but I have one just in case. There is
one place I could probably put up one for 75 over a pond.

Jimmie

Thanks.

tom
K0TAR

If you get one put together let me know how it works for you . My
operation have been very sporatic and I really cant compare it well
with anyting. I would think operation would be best when both stations
are using NVIS antennas but I have yet to communicate with someone who
was doing the same. I have made contacts on this antenna when another
antenna an 18ft vertical was just dead quiet, Location was in a
campsite in a valley near Boone NC.

Jimmie