You must be talking about rohn 25 torque arms, but I have bought the
larger 5/8" bolts and the heavy hex nuts for Rohn 45 from McMaster Carr,
all hot-dip galvanized.
geo - n4ua
> -----Original Message-----
> From: towertalk-bounces@contesting.com [mailto:towertalk-
> bounces@contesting.com] On Behalf Of K4PI
> Sent: Friday, April 08, 2005 2:06 PM
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] TowerTalk Digest, Vol 28, Issue 29
>
> I am looking for some of the bolts that are used in the Rohn torque
arms.
> They are Grade 5, 3 hash marks on head of bolt, galvanized, 2 1/2 X
3/8
> and
> the oversided nuts that go with them. You have anything like that?
> 73 Mike K4PI
>
> ----- Original Message -----
> From: <towertalk-request@contesting.com>
> To: <towertalk@contesting.com>
> Sent: Friday, April 08, 2005 5:00 PM
> Subject: TowerTalk Digest, Vol 28, Issue 29
>
>
> > Send TowerTalk mailing list submissions to
> > towertalk@contesting.com
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
> > http://lists.contesting.com/mailman/listinfo/towertalk
> > or, via email, send a message with subject or body 'help' to
> > towertalk-request@contesting.com
> >
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> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of TowerTalk digest..."
> >
> >
> > Today's Topics:
> >
> > 1. Re: 75 meter antenna (Al Williams)
> > 2. Re: 75 meter antenna (David Jordan)
> > 3. Re: 75 meter antenna (Jim Lux)
> > 4. Re: 75 meter antenna (Al Williams)
> > 5. FS: Rohn 25 Tower & Accessories (doc)
> >
> >
> >
----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Thu, 7 Apr 2005 09:02:05 -0700
> > From: "Al Williams" <alwilliams@olywa.net>
> > Subject: Re: [TowerTalk] 75 meter antenna
> > To: <towertalk@contesting.com>
> > Cc: Rich Patrick <rfpatrick@yahoo.com>
> > Message-ID: <000601c53b8b$2c8b5970$25daadd8@PAPASDELL>
> > Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> > reply-type=original
> >
> > EZNEC shows that this configuration is a barn burner for straight up
> > propagation providing about 4 db gain over a single dipole and much
> > attenuation at lower elevation angles. However EZNEC shows that
raising
> > the
> > antennas from 15' to 20/25 adds about 1 db of gain. NVIS articles
and 1
> > book that I have read say
> > that the optimum height is about .2 lambda which agrees with my
EZNEC
> > modeling. Raising the antennas also makes the input impedance a bit
more
> > manageable.
> > EZNEC doesn't seem to agree with the "...theoretical gain of about
7db"
> > as
> > it reports about 10 dbi?
> >
> > It would seem that this configuration would be especially helpful in
> areas
> > with high ham populations--not so good in Wyoming, etc.
> >
> > k7puc
> >
> >
> > ----- Original Message -----
> > From: "David Jordan" <wa3gin@erols.com>
> > To: "Jim Miller" <JimMiller@STL-Online.Net>
> > Cc: "TOWERTALK" <TOWERTALK@contesting.com>; "Joe Barnes"
> > <n4jbk@bellsouth.net>
> > Sent: Thursday, April 07, 2005 7:14 AM
> > Subject: Re: [TowerTalk] 75 meter antenna
> >
> >
> >> Jim,
> >>
> >> I run a NVIS on 40m 2 full wave dipoles fed in phase just 15ft
above
> >> the ground. Within the first 50-75 miles the signals are
extremely
> >> intense. My station is an Internet remote so I actually operate
about
> >> 50miles from the xmit antennas. Typically, I pin the "S" meter
from 50
> >> miles away. The signals on 40m continue to be very strong up to
about
> >> 350-400 miles, then a dipole at 60ft begins to out perform the
NVIS.
> At
> >> around 350-450 miles the two antennas are about the same most of
the
> >> time but when you get past 500 and well into 900-1000 the dipole at
> 60ft
> >> is about 20db stronger than the NVIS. So, the NVIS does do the job
for
> >> closer in signals. The same would be true for 80m with the NVIS at
> about
> >> 25-30ft above the ground. The NVIS full wave elements are fed with
> >> homebrew 600ohm opern wire (in phase). The two elements are spaced
a
> >> half wave apart (on 40 that is about 70ft). The theoretical gain is
> >> about 7db with a main lob angle of about 80 degree (straight up for
all
> >> intents and purposes) omin directional.
> >>
> >> Another nice benefit of the NVIS is that it doesn't hear the
foreign
> >> broadcast stations nearly as well as the dipole at 60ft.
> >>
> >> Your inverted V at 95ft would be great for DX but it's really too
too
> >> high for short distance communications.
> >>
> >> Having both a NVIS and "V" at 95ft would be a lot of fun.
> >>
> >> 73,
> >> dave
> >> wa3gin
> >>
> >> Jim Miller wrote:
> >>
> >>>QST June 2002 Page 28 has an article for NVIS for 40 and 80.
Should be
> >>>just
> >>>what you are looking for.
> >>>
> >>>73, de Jim KG0KP
> >>>
> >>>----- Original Message -----
> >>>From: "Joe Barnes" <n4jbk@bellsouth.net>
> >>>To: <towertalk@contesting.com>
> >>>Sent: Wednesday, April 06, 2005 8:33 PM
> >>>Subject: [TowerTalk] 75 meter antenna
> >>>
> >>>
> >>>
> >>>
> >>>>can anyone recomend an antenna for 75 meters that would be
optimized
> for
> >>>>zero to about 400 miles? I am currently using an inverted vee with
the
> >>>>apex at about 95 feet. I have 2 towers here , one is 100 feet the
> other
> >>>>is 125 feet, they are 100 feet apart.
> >>>>Thanks , Joe N4JBK
> >>>>_______________________________________________
> >>>>
> >>>>See: http://www.mscomputer.com for "Self Supporting Towers",
> "Wireless
> >>>>
> >>>>
> >>>Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041
with
> >>>any
> >>>questions and ask for Sherman, W2FLA.
> >>>
> >>>
> >>>>_______________________________________________
> >>>>TowerTalk mailing list
> >>>>TowerTalk@contesting.com
> >>>>http://lists.contesting.com/mailman/listinfo/towertalk
> >>>>
> >>>>
> >>>>
> >>>
> >>>_______________________________________________
> >>>
> >>>See: http://www.mscomputer.com for "Self Supporting Towers",
"Wireless
> >>>Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041
with
> >>>any questions and ask for Sherman, W2FLA.
> >>>
> >>>_______________________________________________
> >>>TowerTalk mailing list
> >>>TowerTalk@contesting.com
> >>>http://lists.contesting.com/mailman/listinfo/towertalk
> >>>
> >>>
> >>>
> >> _______________________________________________
> >>
> >> See: http://www.mscomputer.com for "Self Supporting Towers",
"Wireless
> >> Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041
with
> >> any questions and ask for Sherman, W2FLA.
> >>
> >> _______________________________________________
> >> TowerTalk mailing list
> >> TowerTalk@contesting.com
> >> http://lists.contesting.com/mailman/listinfo/towertalk
> >>
> >
> >
> >
> > ------------------------------
> >
> > Message: 2
> > Date: Thu, 07 Apr 2005 12:44:21 -0400
> > From: David Jordan <wa3gin@erols.com>
> > Subject: Re: [TowerTalk] 75 meter antenna
> > To: Al Williams <alwilliams@olywa.net>
> > Cc: Rich Patrick <rfpatrick@yahoo.com>, towertalk@contesting.com
> > Message-ID: <42556365.8000503@erols.com>
> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> >
> > Yes, I've not run the measurements myself...a friend provided theidb
> > inputs...in my current configuration there are
> > reflectors on the ground that are cut 5% long. I doubt they will
add
> > much but you might try adding them to your EZNEC.
> >
> > 4 or 7db it does the trick...
> >
> > 73,
> > dave
> > wa3gin
> >
> > Al Williams wrote:
> >
> >>EZNEC shows that this configuration is a barn burner for straight up
> >>propagation providing about 4 db gain over a single dipole and much
> >>attenuation at lower elevation angles. However EZNEC shows that
raising
> >>the
> >>antennas from 15' to 20/25 adds about 1 db of gain. NVIS articles
and 1
> >>book that I have read say
> >>that the optimum height is about .2 lambda which agrees with my
EZNEC
> >>modeling. Raising the antennas also makes the input impedance a bit
more
> >>manageable.
> >>EZNEC doesn't seem to agree with the "...theoretical gain of about
7db"
> >>as
> >>it reports about 10 dbi?
> >>
> >>It would seem that this configuration would be especially helpful in
> areas
> >>with high ham populations--not so good in Wyoming, etc.
> >>
> >>k7puc
> >>
> >>
> >>
> >>
> >
> >
> > ------------------------------
> >
> > Message: 3
> > Date: Thu, 07 Apr 2005 12:01:18 -0700
> > From: Jim Lux <jimlux@earthlink.net>
> > Subject: Re: [TowerTalk] 75 meter antenna
> > To: "Al Williams" <alwilliams@olywa.net>, <towertalk@contesting.com>
> > Cc: Rich Patrick <rfpatrick@yahoo.com>
> > Message-ID: <6.1.1.1.2.20050407094323.02684400@mail.earthlink.net>
> > Content-Type: text/plain; charset="us-ascii"; format=flowed
> >
> > At 09:02 AM 4/7/2005, Al Williams wrote:
> >>EZNEC shows that this configuration is a barn burner for straight up
> >>propagation providing about 4 db gain over a single dipole and much
> >>attenuation at lower elevation angles. However EZNEC shows that
raising
> >>the
> >>antennas from 15' to 20/25 adds about 1 db of gain. NVIS articles
and 1
> >>book that I have read say
> >>that the optimum height is about .2 lambda which agrees with my
EZNEC
> >>modeling. Raising the antennas also makes the input impedance a bit
more
> >>manageable.
> >>EZNEC doesn't seem to agree with the "...theoretical gain of about
7db"
> >>as
> >>it reports about 10 dbi?
> >>
> >>It would seem that this configuration would be especially helpful in
> areas
> >>with high ham populations--not so good in Wyoming, etc.
> >>
> >>k7puc
> >
> > A lot of the details are going to depend on what the soil properties
> are,
> > and I'd venture that most hams don't have a real good handle on
exactly
> > what they are for their particular site.
> >
> > When you ran your EZNEC models did you use the sommerfield ground or
the
> > reflection coefficient? (makes a big difference on feed point
> impedances,
> > and the corresponding gains)
> >
> >
> >
> >
> > ------------------------------
> >
> > Message: 4
> > Date: Thu, 7 Apr 2005 12:19:21 -0700
> > From: "Al Williams" <alwilliams@olywa.net>
> > Subject: Re: [TowerTalk] 75 meter antenna
> > To: <towertalk@contesting.com>, "Jim Lux" <jimlux@earthlink.net>
> > Cc: Rich Patrick <rfpatrick@yahoo.com>
> > Message-ID: <000401c53ba6$bb120f20$25daadd8@PAPASDELL>
> > Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> > reply-type=response
> >
> >
> > ----- Original Message -----
> > From: "Jim Lux" <jimlux@earthlink.net>
> >
> >
> >>
> >> A lot of the details are going to depend on what the soil
properties
> are,
> >> and I'd venture that most hams don't have a real good handle on
exactly
> >> what they are for their particular site.
> >>
> >> When you ran your EZNEC models did you use the sommerfield ground
or
> the
> >> reflection coefficient? (makes a big difference on feed point
> impedances,
> >> and the corresponding gains)
> > Although I have ran hundreds of wire antennas with EZNEC, I am still
a
> > novice--usually variations of wire configurations rather than
exploring
> > the
> > effects of various ground properties.
> >
> > I used the "real/hi accuracy and 1 medium 0.005,13). Also used only
#16
> > copper wire.
> >
> > We will appreciate advice.
> >
> > k7puc
> >
> >
> >
> > ------------------------------
> >
> > Message: 5
> > Date: Thu, 07 Apr 2005 21:22:48 -0400
> > From: doc <kd4e@verizon.net>
> > Subject: [TowerTalk] FS: Rohn 25 Tower & Accessories
> > To: "For Sale - Swap List (For Sale - Swap List)"
> > <forsale-swap@mailman.qth.net>
> > Cc: FLBOATANCHORS@yahoogroups.com, towertalk@contesting.com
> > Message-ID: <4255DCE8.3060706@verizon.net>
> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> >
> > I need a 50' tiltover or 5 or 6 Rohn 45 or 55 sections.
> >
> > Need to sell my Rohn 25 stuff. Asking prices are picked
> > up. Small items may be shipped and are plus actual cost.
> > Pictures available upon request.
> >
> > (Items are located in Florida a little north of Tampa.)
> >
> > 11 Rohn 25G Mid-Sections $30. each
> > 1 Rohn 25AG Top Section $30.
> > 1 Rohn 25AG Top Section $25.
> > 2 Rohn 25G cut-off mid-sections $10. each
> > 1 Rohn BPH25G HINGED BASE PLATE $75.
> > 3 Rohn AS25G Accessory Shelves $30. each
> > ? Rohn various turnbuckles $10. each
> > 2 Rohn side-arms $20. each
> > 2 Rohn RP25GCM SPECIAL ROTOR POST $15.
> > 1 Rohn HB25AG ADJUSTABLE HOUSE BRACKET $35.
> > 3 Rohn WM-series Wall Brackets $10. each
> > 2 Rohn Gable End Mounts $10. each
> > ? Rohn 25 Misc Hardware $??
> >
> > --
> > Thanks! & 73, doc kd4e
> >
> > |_|___|_|
> > | | & | |
> > {|
> > /\ {|
> > / \ {|
> > / \ {|
> > / @ \ {|
> > | |~_|~~~~|
> > | -| | |
> > ============\ # West Central Florida
> > KD4E ==============================
> > http://bibleseven.com
> > Ham PC = 100% Linux Novell-Suse 9.2
> > Halli, Heathkit, Homebrew, MFJ, TenTec, Yaesu
> > Radio Life: http://www.gospelcom.net/twr/
> > Linux-Incompatible hardware is defective!
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >
> >
> > ------------------------------
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
> >
> >
> > End of TowerTalk Digest, Vol 28, Issue 29
> > *****************************************
> >
>
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting Towers",
"Wireless
> Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041
with
> any questions and ask for Sherman, W2FLA.
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
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_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
_______________________________________________
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