The T Match tuner is what sits in the house Price. The T Match feed on the
antenna is completely different, is grounded to the boom on the all metal
design
and is no more prone to P-static than any other feed system.
My own yagis use a T Match from 28 to 432 MHz and work very well and without
: Thursday, November 15, 2012 2:25 PM
To: Bruce; topband@contesting.com
Subject: Re: Topband: Covered /bare antennn wire
As you have said it is difficult to get a A-B test unless instant
switching or direct observation is available.
The purpose of my test was to see if p-static was caused
It also doesn't seem to matter if the antennas in the stack have their
elements insulated from the boom or bonded to it, the top antenna always
has
+20 dB or more noise.
73 John N5CQ
That agrees with dozens of other reliable A-B reports by other people.
Everyone who has side-by-side
Looks like Inside the house antennas have enough air space insulation
to prevent corona and voltage arcs.
We probably could not insulate an outside antenna that well.
73
Bruce-K1FZ
The antenna trickle charges the output capacitor (with microamperes of
current) until the cap flashes over.
Very true Tom,
I am using on 20 meters a Telrex 20M546. The Telrex uses a T network. The T
bars
are very close to the driven element and longer than normal. They use no series
capacitors.
Or should I say condensers as they were called when Mike Arcelino designed the
Telrexs.
73 Price W0RI
From my own exhaustive research and many lab experiments with HV corona
discharge, it seems to me that at least some of this could be eliminated by
either:
1. Eliminating all the sharp points
2. Properly covering all the sharp points with suitable insulation such as
heat shrink or vinyl caps.
From my own exhaustive research and many lab experiments with HV corona
discharge, it seems to me that at least some of this could be eliminated
by
either:
1. Eliminating all the sharp points
That's one reason why car antennas had round balls on the tips. Take it off
and drive 70 MPH in dry
From my own exhaustive research and many lab experiments with HV corona
discharge, it seems to me that at least some of this could be eliminated
by
either:
1. Eliminating all the sharp points
2. Properly covering all the sharp points with suitable insulation such as
heat shrink or vinyl
Subject: Re: Topband: Covered /bare antennn wire
Very true Tom,
I am using on 20 meters a Telrex 20M546. The Telrex uses a T network. The T
bars
are very close to the driven element and longer than normal. They use no
series
capacitors.
Or should I say condensers as they were called when Mike
Dry blowing snow or high wind can cause quite some voltage build up on a
antenna, especially a long one. It is possible to draw quite an arc to ground.
There have been reports of high voltage electrocutions from antenna static
build up in Short Wave Broadcast stations. A short stick was
Why not prevent the static buildup in the first place? I use 33K resistors
from each wire to ground. Schematic is at
http://www.w0btu.com/Beverage_antennas.html .
The components in parallel with the 33K resistors are 90 volt gas discharge
tubes, and the resistors are to prolong the life of those
On 2012-11-15, at 3:42 PM, Bruce wrote:
Dry blowing snow or high wind can cause quite some voltage build up on a
antenna, especially a long one. It is possible to draw quite an arc to
ground.
There have been reports of high voltage electrocutions from antenna static
build up in Short
73 Bruce-K1FZ
- Original Message -
From: Mike Waters mikew...@gmail.com
To: topband topband@contesting.com
Sent: Thursday, November 15, 2012 9:56 AM
Subject: Re: Topband: Covered /bare antennn wire
Why not prevent the static buildup in the first place? I use 33K
resistors
from each
On 2012-11-15, at 4:35 PM, Bruce wrote:
Good point Mike, but I am hoping someone has done definitive testing between
insulated and un-insulated wire concerning voltage build up. If the voltage
is lower with insulated wire there is less to bleed off, and possibly lower
noise activity.
you in the pile ups,
73
Bruce
- Original Message -
From: Eddy Swynar
To: Bruce
Cc: topband@contesting.com
Sent: Thursday, November 15, 2012 10:31 AM
Subject: Re: Topband: Covered /bare antennn wire
Hi Bruce,
I am not so sure that the notion of insulated vs
Hi Bruce,
Sure, and I'd be interested in knowing that, too. :-)
I should add that the GDTs were added after a lighting hit in the vicinity
caused windings to open up on the transformers. The GDTs were to prevent
that, and the resistors were to minimize the number of times that the GDTs
conducted
Out of curiosity, has anyone ever really done testing of voltage buildup
on a insulated antenna wire, VS a non-insulated wire ?
Indoor antennas VS outdoor antennas of equal size?
I tested this extensively years ago, and there was no difference at all
except if the insulation was in an area
To: Bruce k...@myfairpoint.net; topband@contesting.com
Sent: Thursday, November 15, 2012 11:14 AM
Subject: Re: Topband: Covered /bare antennn wire
Out of curiosity, has anyone ever really done testing of voltage buildup
on a insulated antenna wire, VS a non-insulated wire ?
Indoor antennas VS outdoor
As you have said it is difficult to get a A-B test unless instant
switching or direct observation is available.
The purpose of my test was to see if p-static was caused by individual
charged particles as they hit the wire, or some other mechanism like corona
discharge into the charged air or
...@myfairpoint.net; topband@contesting.com
Sent: Thursday, November 15, 2012 12:25 PM
Subject: Re: Topband: Covered /bare antennn wire
As you have said it is difficult to get a A-B test unless instant
switching or direct observation is available.
The purpose of my test was to see if p-static
I used to have an ICE model 303 lightning protector which I believe
was a gas discharge tube with a toroidal choke in parallel to ground.
I recall the toroidal choke was to continually bleed the electrons
from the antenna so there would not be a buildup sufficient to cause
damage and to not
Subject: Re: Topband: Covered /bare antennn wire
As you have said it is difficult to get a A-B test unless instant
switching or direct observation is available.
The purpose of my test was to see if p-static was caused by individual
charged particles as they hit the wire, or some other
Subject: Re: Topband: Covered /bare antennn wire
Tom,
Thank you for your research and information. You have me convinced
My much lower BOG Beverage has a better signal to noise than my taller
Beverages in storm events. This aligns to your research.
73
Bruce-K1FZ
That has nothing to do
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