I don't think that you have necessarily wasted your time, but you have
severely limited your chances of decreasing lightning damage. It's like
replacing 3 tires on your car that has 4 bad tires, you've bettered your
odds but it is not the best fix.
I have a site that the owner would throw me
OK, yes, you have severely limited your chances of being protected. I'd
hazard a guess that it would be a fraction of a percent better than having
no protection at all. Your condom has a hole in it ;-)
Chuck
WB2EDV
- Original Message -
From: Joe k1ike_m...@snet.net
To:
Better than a fraction of a percent protection. I've lost a couple of
polyphasors in the years, but never had lightning damage. I'm a
realist, everything isn't perfect all of the time.
73, Joe, K1ike
On 8/18/2010 9:04 AM, Chuck Kelsey wrote:
OK, yes, you have severely limited your chances
Lightning protection is not simply a surge protector but a system of surge
protectors, grounds and installation techniques that may reduce the
effects of a nearby lightning event. And as Chuck says unless you install a
lightning/grounding system the effect of a single device is
On 8/17/2010 11:55 PM, Ray Brown wrote:
What do you do when you want to install a small UHF linking repeater on
a 4-story building that has no lightning protection on its' roof? (this is to
link an ambulance at a hospital to its' base repeater 40 miles away)
From what I've heard, it may
Remember the objective is not to take the brunt of a lightning strike,
but to drain off any static that would attract that strike. Lightning is
just a spark looking to close the gap, and if your antenna is closer to
DC ground, it will find something closer to its potential (i.e. static
Hi,
This is a European MPT1327 trunked radio. Needs a specific GM600 version of
RSS to program it. I saw that the RSS seemed to be available on the web at
some HAM sites. Do a web search for Motorola GM600 RSS, OK?
Peter
On Sun, Aug 15, 2010 at 7:03 AM, dxhunters dxhunt...@yahoo.com wrote:
Well, at least we can say you've lost some PolyPhasers in the process.
Whether they've helped is anyone's guess. Yes, I've got some equipment in
different locations with what I feel less than adequate protection. My
point was essentially making people aware that by simply putting a
The building has a steel support structure, I'm sure. You will need to bond to
that as a start.
Bill
From: Eric Lemmon wb6...@verizon.net
To: Repeater-Builder@yahoogroups.com
Sent: Tue, August 17, 2010 11:30:03 PM
Subject: RE: [Repeater-Builder] Polyphaser
On 8/18/2010 11:46 AM, Bill Smith wrote:
The building has a steel support structure, I'm sure. You will need to bond to
that as a start.
Bill
An even better choice, yes.
You should be able to clean off a spot and clamp to an I-beam. Make sure
you get down to bare metal under the clamp.
You might like to look at the latest Motorola R56 Installation standards
manual. It's very comprehensive. Has good section on grounding and
protective devices.
Yes, a good grounding system and a full lightning and surge protection of an
RF site doesn't come cheap. But if you live in Florida the
Does anyone have a datasheet or tuning instructions for this kind of
circulator? It's a single stage with 3 adjustment screws and right now the
sticker says it's on 420 MHz and I would like to know how I get a working range
from 430 to 440 MHz. If somebody can explain without the doc this is
Hi,
Harold Kinley wrote an excellent article in MRT magazine a few years ago on
aligning circulators. Maybe they still have re-prints. I have old contact
details for Harold Kinley taken from MRT magazine. See below. You should
also buy his *Standard Radio Communications Manual, with
That book does indeed look interesting, but I wasn't able to find anything out
about that article, unfortunately.
Don't know about that circulator, but many have a narrow tuning range without
going back to the factory for modifications. Sid.
--- In Repeater-Builder@yahoogroups.com, cruizzer77 atlant...@... wrote:
That book does indeed look interesting, but I wasn't able to find anything
out about
Hello Martin
Have you contacted Celwave to see if the have tuning specs usually for
these.
I am not sure if you will get it up to 440 or not.
I was told that they are pretty narrowband, but I might be wrong.
YMMV
Butch, KE7FEL/r
On Wed, Aug 18, 2010 at 1:18 PM, cruizzer77 atlant...@gmx.ch
Here is a little primer on lightning:
Having your antenna grounded does not drain off any charge that helps
prevent a strike. As a matter of fact grounding the antenna makes it
slightly more prone to a strike but not grounding it is much worse as you
have no control over what path the energy
And to not create (or leave) a path for current flow to destroy equipment.
Chuck
WB2EDV
- Original Message -
From: Gary Schafer
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, August 18, 2010 8:39 PM
Subject: RE: [Repeater-Builder] Polyphaser Question
Here is a
I agree totally with Gary. Common grounding point is essential to avoid
voltage differences between equipment during a strike. When you get a
strike the grounding point will rise, so you want to make sure everything
that is grounded goes up together. As the leading edges of the voltages
strikes
This is taken from a Wacom tuning guide
please excuse any typos
Roger
CABLE LENGTH BETWEEN TRANSMITTER AND DUPLEXER
The length of the coaxial cable between the transmitter and the duplexer might
be a critical length with some transmitters because of an impedance mismatch. A
mismatch condition
Hello everyone,
I have a couple of radios for sale, time to make some changes in my van :-)
I've seen some people using the DR-235 220 MHz and the Motorola GTX 900 MHz
radios for repeater exciter or receive radios
(1) Kenwood TK-790 Mobile radio; 45w 2-meter mobile - I program at no charge
if
Michael Ryan mryan...@tampabay.rr.com wrote:
I notice when looking at the Polyphaser website, there are a wide range of
products, even a wide variety of items that on the surface appear to be
suited to my particular needs. I want to put a Polyphaser on my 220
repeater. There are
become a satisfied customer.
Jeff N5sxq
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There is no way that impedance matching can be accomplished with changing the
length of the transmission line in a 50 ohm system when the transmission line
used is also of the same characteristic impedance without a compensating shunt
XC or XL stub, at a location determined on a Smith Chart
This has been a very interesting thread to watch, and most of the
installations that I've done have been 'add-ons' to existing well
designed systems.
On a different note, I'm now working on a solar powered system,
and was wondering about the grounding there. Everything will
be mounted on a
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