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-----Original Message-----
From: Jim <jdc@ieway.com>
To: Bill Aycock <baycock@HIWAAY.NET>; T A RUSSELL <n4kg@juno.com>
To: <towertalk@contesting.com>
Date: Friday, August 06, 1999 9:05 PM
>Gee Tom....Did you happen to look in your trash bin for the message that I
>was responding to ???
>
>Guess not!
>
>Let me refresh your memory.....
>
>
>73
>
>Jim W7RY
>
>
>-----Original Message-----
>From: Bill Aycock <baycock@HIWAAY.NET>
>To: Jim <jdc@ieway.com>
>Cc: T A RUSSELL <n4kg@juno.com>
To: <towertalk@contesting.com>
>Date: Friday, August 06, 1999 11:47 AM
>Subject: Re: Fw: [TowerTalk] (no subject)
>
>
>>Jim- YOU were the guy sending the messages with no subject- I checked back
>>in the trash bin- and -- there you were.
>>
>> I agree with Tom. He is not the subject police, and neither am I, but
most
>>of us on the lists would rather see a subject on all messages.
>>
>>Bill- W4BSG
>>
>>At 06:12 PM 8/6/99 -0700, you wrote:
>>>
>>>
>>>-----Original Message-----
>>>From: Jim <jdc@ieway.com>
>>>To: T A RUSSELL <n4kg@juno.com>
To: <towertalk@contesting.com>
>>>Date: Friday, August 06, 1999 6:08 PM
>>>Subject: Re: [TowerTalk] (no subject)
>>>
>>>
>>>>Gee Tom.......Why don't you send this message to the guy that originated
>>>the
>>>>message with no subject.........!!
>>>>
>>
>>-
>>Bill Aycock W4BSG EM64vr
>>Jackson County, AL
>>
>>W4BSG is "vanity" this time, but was
>>earned by exam in 1954, the first time.
>>
>>w4bsg@arrl.net
>>
>
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To: <towertalk@contesting.com>
Date: Tue, 27 Jul 1999 08:46:32 -0500
From: michael ihry <mihry@argontech.net>
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Hi Dave,
We are lucky enough to have a coast guardsman as one of our members, who
has procured retired USCG rope for us. Mostly MUCH to big (1.25" dia)
but
some of what we got is great...woven nylon braid, over nylon braid,
about
3/4"...Check with your local coast guard.
73, DX, de
Pat, AA6EG/N6IJ;
aa6eg@hh.tmx.com
599 DX Drive, Marina CA 93933
See us on the web: www.polkinghorn.org/n6ij
"The Contest Station from the Government"
On Tue, 27 Jul 1999, David Robbins wrote:
>
> I need a new gin pole lifting rope for heavy duty use. I can't find the
> stuff I have used in the past locally any more. I'm looking to find out
> what others are using for heavy lifting these days, and where to get it.
>
> --
> David Robbins K1TTT (ex KY1H)
> k1ttt@berkshire.net or robbins@berkshire.net
> http://www.berkshire.net/~robbins/k1ttt.html
>
> --
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>
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To: <towertalk@contesting.com>
Date: Mon, 02 Aug 1999 19:31:28 -0500
From: "Michael D. Ihry" <mihry@argontech.net>
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In a message dated 8/1/99 10:22:23 PM Eastern Daylight Time,
jlangdon@outer.net writes:
<< I have some of both but would use Bury-Flex throughout next time.
73 John N5CQ >>
Rod and John,
Thanks for your interest and comments. We sell both LMR and
"Bury-Flex"
Tm (a design of DAVIS RF Co.). It makes no difference to me which we
sell.
I just want to be sure that the application is considered so I can best
advise the customer.
When you sit grasping one end of prox. 2.5 feet of Bury Flex and
same
length of LMR400, you will see a bit more flexibilty in the Bury-Flex Tm
when
you alternately move the other end of the cables back and forth. They
are
both made of similar Polyethylene compound jacket (PE is buriable, PVC
is
not, in any case). Strength and bend radius is basically the same.
Same as
to power handling.
Attenuation-wise there is no difference to speak of in the two, below
1
Ghz ( oneth or two tenths of a dB, here or there). And, if you go to
LMR
500, you only gain .16 dB at 30 MHz (most of our ham inquiries are for
HF)
and LMR 500 requires special connectors, obtainable from us via Times or
one
of our quality suppliers such as RF Industries (RFI).
Now, if you plan to operate above 1 GHz, that's another story and we'd
be
glad to advise anybody ref. LMR, Bury-Flex, Heliax and other options.
I think that this also points out that "Bury-Flex" is not only very
practical for burying only. Have a crank up??? It makes and excellent
coil, similar to the red "Nycoils" you see on the news truck elevating
masts
(we provide the internal cabling for one of the prime Nycoil builders).
NOTE: Bury-Flex Tm has been a VERY popular product for many years,
sought
out by dealers as well. "Bury-Flex"'s suggested List price is pretty
much
equal to most companies selling LMR 400. We sell LMR 400 at about 8
cents
below the general cost out there (our ham customers get the same prices
as
commercial co's.). So, you can save a small amount on LMR400, or check
with
your local dealer about Bury-Flex Tm and save on the shipping, whichever
helps you the best. Cheers, Steve Davis, K1PEK.
------------------------------------------------------------------------------
---------------------
DAVIS RF Co., commercial wire and cable, custom cable design. Discounts
to
hams. Heliax, LMR, RFS, Belden, Poly Phaser Lightning Protection
Devices.
Various aerial wiring; transmission lines, insulators, baluns, RF
connectors
and Dacron rope. www.davisRF.com . 1-800-328-4773, (For all RF
hardline
related items, please ask for Steve Davis) Thank you!
"The Triad": Davis RF Co.; Orion Wire Corp.; and The Wire Man, Inc.:
Variegated expertise; resources and buying power yielding numerous
quality
products at highly competitive pricing.
------------------------------------------------------------------------------
---------------------
DAVIS RF Co., commercial wire and cable, custom cable design. Discounts
to
hams. Heliax, LMR, RFS, Belden, Poly Phaser Lightning Protection
Devices.
Various aerial wiring; transmission lines, insulators, baluns, RF
connectors
and Dacron rope. www.davisRF.com . 1-800-328-4773, (For all RF
hardline
related items, please ask for Steve Davis) Thank you!
"The Triad": Davis RF Co.; Orion Wire Corp.; and The Wire Man, Inc.:
Variegated expertise; resources and buying power yielding numerous
quality
products at highly competitive pricing.
--
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To: <towertalk@contesting.com>
Date: Wed, 04 Aug 1999 06:10:26 -0500
From: "Michael D. Ihry" <mihry@argontech.net>
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Status: U
The #1 Iron is a bit facetious, but there's an element of
truth in it. The purpose of the lightning rod (or Franklin
terminal) is to be the highest point in the area. When the
lightning starts heading down (it is called the step leader
and it jumps in ~150' increments), as it approaches, streamers
start heading upwards to meet the step leader. The purpose of
the rod is to provide the streamer most likely to find favor with
the step leader and, when they meet, create the return stroke
which is the pulsed ionized white streak we call lightning. The
concept is for you, rather than Mother Nature, to control where
the strike occurs. The other important part of lightning protection
is to have a low inductance ground so the energy will flow to the
earth and be absorbed rather than finding this path through your
brand new Yaesu FT-1000D! BTW, your Ufer should *not* be the
only grounding system but should be connected to a good ground
system as an adjunct.
Any good surge suppression system should dump the energy into
the ground system for dispersal into the earth. Because of the fast
rise times associated with lightning (on the order of a few
microseconds),
frequencies up into the GHz range are generated, although the bulk
of the damage is done by the high energy DC or near DC components.
Skin effect limits the capacity of the grounding wiring, so Poly has
always recommend wide copper strap over even 4/0 wire (forget the
ubiquitous #6; it'll work for the power company's 60 Hz, but not for the
frequencies generated by lightning). You want to provide a low
inductance
path so that all of the lightning energy goes into the earth with
minimum
impedance. So whether you choose MOVs or SADs, make sure you create
a good ground system for the shunted energy to go or it will still find
a way to
get to your new 36" TV with the surround sound feature! At best, you
will
shorten the lifespan of your protective device.
For additional info, contact Poly and purchase their book "The 'Grounds'
For Lightning and EMP Protection." If you get Tricia, tell her I said
"hello."
73
Bob Wanderer AA0CY
----------
From: Peter J. F. Shaw[SMTP:k4ldr@hitter.net]
Sent: Monday, August 02, 1999 6:37 AM
To: Bob Wanderer
Subject: Re: [TowerTalk] Lightning prot. (& bases on slopes)
Ahoy Bob:
Is ur closing remark about the #1 iron on the chimney a suggestion or
recommendation for a roof lightning rod system....or just a closing to
ur discussion on MOVs/SADs? I got something useful from ur
discussion.
I am located in the belt across Florida alleged to be the world's 2nd
highest ground strike lightning area; and on the highest ground around
(135 ft AMSL is a mountain in FL). 4 strikes last year, but no ham
gear lost. Fire in radio central and lots of household appliances
cooked. I have a Ufer system in the floor slab and MOV protectors on
AC entry, well head, etc.
My high lightning is why I was asking about the lightning rod system.
I am thinking about installing two grounded 35 ft masts at opposite
ends of the one-story house and connect them with an overhead cable.
This concept is similar to what NASA has at the Canaveral space
shuttle launch tower. There, a big insulator is on the very top with
large diameter cables going to earth like guy wires. I don't know any
details more than that.
Lightning rods or no rods? That is the question. The serving power
company lightning wizards explain that their opinion is that it is a
bad idea for a rod system to be attached to the house structure. They
say that the usual home TV antenna tower should be mounted 25 ft away
from the house and well grounded. We are in a fringe area, the TV ant
towers have to be 40-50 ft and their idea is that the higher tower
gets the lightning stroke.
I wud welcome ur comments.
Tnx 73 Pete K4LDR Citrus County, FL (55 miles North of Tampa
Airport)
P.S. Lightning is so frequent and scary up here on the hill, my pals
call me Sparky.
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From: "Michael D. Ihry" <mihry@argontech.net>
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PLEASE DO NOT USE CC: IN HEADER
Hi Kurt,
I used the 6KW Palomar beam balun to cure a friends TH7 feed problem.
Bill Wall KC4UZ
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From: "Michael D. Ihry" <mihry@argontech.net>
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Kurt,
I tried to duplicate the length of the pigtails that the TH6 manual
shows for using a coil of coax. As I recall, the length for the TH6 is
6 3/4 inches. Some of the guys around here made the jumpers shorter
and shifted the SWR curve up the band. The jumper is actually part of
the driver element length. My TH6 is set for the CW dimensions with
the correct length jumpers and the SWR minimums are exactly where the
manual sez they should be. GL with ur project.
73, Stew...
--- Kurt Andress <K7NV@contesting.com> wrote:
>
> >BTW, I've
> > used a teflon coax balun on my TH6 for many years
> with no problems.
> >
>
> Stew,
> Another question, Gerald, K5GW, has indicated that
> the factory pigtails
> form part of the impedance matching bizo.
>
> Did you do anything special to try and replicate the
> factory jumpers and
> inside balun lead lengths or control the spacing of
> the coax pigtails?
>
> Geralds input suggests I should try to do this.
>
> --
> 73, Kurt, K7NV
>
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Fellow TT's,
My delima is this:I have raised my 50 ft tower to 85 ft so
I can stack 2 KT34XA's.I originally had 1 KT at 50 ft rotatable.
I fed it with 75 ohm catv.It worked great,good swr curves where
they should be.I now have this beam mounted to the side of the
now 85 ft tower at 50 ft.I have run a new piece of catv to feed
the
stacked beams when I get the 2nd one mounted at the top.I am
going to use a stackmatch fed with equal lengths of 8214 coax.
By the way,I have cut the new catv to 1/2 wave electrical length
so as to get a good match.I decided to hook up the beam that
is sidemounted on the tower to make sure it didnt get out of
tune by being bolted to the tower.I have 2 27 ft pieces of 8214
that I intended to use from each beam to the stackmatch.I used
one of these to hook up this beam directly to the catv.Lo and
behold,my swr was totally out of wack.I was thinking that maybe
this coax was bad because I have had it a while.I took the other
piece and tried that but got the same results.So, I took a full
50 ft
piece of 8214 and hooked it up and found that all became normal
once again.Can I assume that this length has now made things
where they are supposed to be because of lengths? Should I not
worry about the fact that I now have excessive lenghts of coax
that
I would assume having more loss in the system?My new piece
of catv is probably about 50-75 ft longer than it needs to be to
feed
the tower,but it had nulls right where I wanted them.Am I
defeating
the purpose of the hardline by using the longer than necessary
lengths?
If I leave things as they are,I will have a total length of 293
feet of
feedline to the beams.I would appreciate your comments,and I
am hoping that I havent just created a massive dummy load.It
seems
to be working well though.
Thanks,
Bob-WT9Q
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Date: Thu, 05 Aug 1999 18:38:40 -0500
From: "Michael D. Ihry" <mihry@argontech.net>
Reply-To: mihry@argontech.net
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Status: U
By the way, Lowes here sells 3 conductor #14 (3
conductors + ground) for about $22 per 250 feet.
If you parallel two of these you can get the eight
wires you need for Ham series rotor. One
connecton to the rotor is ground so you can use
the ground conductor of one cable for that. The
meter circuit is low voltage so you can use the
ground of the second cable for one of its leads.
Where this gets to be a real benefit cost wise is
when you go over 325 feet. The commercial rotor
cable gets as expensive as low loss coax....
73 de Brian/K3KO
Brian Smithson wrote:
>
> I've seen suggestions in the past to use household wire for rotor
> cable. My question is which kind to handle the elements - how does
> regular romex do in UV? Other types?
>
> Tnx es 73!
>
> -Brian n8wrl
>
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