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(no email)
Date: Tue Aug 10 2004 - 18:32:11 EDT
The bottom line is, it is not an exact science. Some get excellent results
with a piece of wire hauled up on a halyard and no ground. Just about
anything will work to some degree and the evaluation of how well it works is
very empirical making comparison of different techniques nearly impossible.
Over the years, there are some basic techniques that are consistently
reliable but may or may not be required in an individual installation.
So when doing a new installation, you follow as many of the accepted
guidelines that you can to try to get the best results. Compromise is the
overriding factor and you give it your best shot.
Regards,
Andina Marie Foster,
----- Original Message -----
From: Roger Rippy
To: ;
Sent: Tuesday, August 10, 2004 6:09 PM
Subject: Re: lv-ab: Ground plane
I really do not disagree; technically, you are absolutely correct. But
having said that, my experiences suggest that radio propagation (sun spots,
etc.) have a more dramatic effect on how well I communicate and at what
distances than transmitted power and other such factors. I have always hated
to put any additional holes through the hull of my boats and have avoided an
external grounding plate. My SSB/ham rig works OK with the current grounding
approach; but there probably is room for improvement. Thanks for sharing
your thoughts. Regards, Roger Rippy SV Tin Cup
wrote:
This may work but is not optimum for SSB radio frequency grounding. To
get
a large ground plane you need to engage a large surface of the seawater.
A
through hull fitting will not meet these requirements. A metal keel will
be
a fairly good substitute if you have one.
Regards,
Andina Marie Foster,
----- Original Message -----
From: Roger Rippy
To:
Sent: Sunday, August 08, 2004 1:00 PM
Subject: lv-ab: Ground plane
IMHO, if you are a salt water cruising boat, I would simply use some
grounding braid like you can purchase from a ham radio outfit like
Amatuer
Electronic Suppy and run the ground braid from the grounding post of
both
the transciever and the tuner directly to the closest thru-hull
(provided
that the thru-hull is bronze). I even ground my vertical ant enna (hf
antenna - hustler vertical with screw on resonators) directly to the
rudder
post. The long wire (backstay) does not need grounding.
This set up works very well in saltwater and even brackish water.
Standing
wave ratio (SWR) is tuned by the tuner to a very acceptable level.
On a previous boat, we used copper screen that was lining the hull and
grounded to a thru-hull, but the performance was not noticably better.
Regards,
Roger Rippy
SV Tin Cup
W7RIP
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