In a message dated 96-08-14 09:39:19 EDT, you write:
>Now, as I am in the process of PLANNING a 45 g tower I am very interested in
>anything concerning R 45g! Am I right in assuming that the 45g is capable
>of 8 more sq footage of beam ( theoretically ) than is stated in the
>manual? If so, this really helps explain why I've heard so many Hams over
>the years state that Rohn has a "safety margin" built into their specs.
>This is not a safety margin per se, but it does help me in my planning
>tremendously ( assuming I'm right in my assumption!)
Mike --
Yes, the 45G (and 55G) is capable of supporting an ADDITIONAL 8 square
feet at the top of the tower. This was confirmed in a phone call to Rohn
engineering this morning. The figure in the drawing is for antennas ONLY.
Since commercial antennas typically use side arm mounts, Rohn has already
deducted it from the square footage wind load of the tower. For amateur
purposes, we don't use them so you can ADD the 8.0 square feet to the figure
given in the Rohn catalog to arrive at an amateur-type wind load.
Of course there is an additional engineering safety factor built into the
figures already. This engineering safety factor doesn't have anything to do
with the discussion of the additional 8 square feet of wind loading
available.
73, Steve K7LXC
TOWER TECH -- professional tower supplies and services for amateurs
>From norf@euronet.nl (Rob Snieder PA3ERC) Tue Aug 13 22:50:08 1996
From: norf@euronet.nl (Rob Snieder PA3ERC) (Rob Snieder PA3ERC)
Subject: Attn Europe: 40 Meter sked?
References: <m0uq0il-000f8FC@mgate.arrl.org>
Message-ID: <3210F890.908@euronet.nl>
Swanson, Glenn, KB1GW wrote:
>
> HELLOOOO Europe...
>
>
> Anyone in Europe care to make a sked so I can try out my
> newly-erected 2-element phased (contesting) array?
> (I'm only running 100 Watts, at the moment...)
>
> 73, Glenn, KB1GW in Connecticut
> Reply to: kb1gw@arrl.org
Europe QRV tell me the time and date
Rob Snieder PA3ERC
member of Contestgroup Oude Maas PI4COM/PA6WPX
Homepage PI4COM : http://www.euronet.nl/users/norf/pi4com.html
Now with lots of picture of the station !
WF1B FRIEND.INI : http://ids.net/~wf1b/updates.html
Internet e-mail : norf@euronet.nl
Packet Radio : PA3ERC@PI8MBQ
PacketCluster : PA3ERC > PI8DXC
>From seay@alaska.net (Del Seay) Wed Aug 14 16:45:51 1996
From: seay@alaska.net (Del Seay) (Del Seay)
Subject: 1/2 Hardline to PL-259?
References: <960814122720_384730591@emout08.mail.aol.com>
Message-ID: <3211F4AF.1B69@alaska.net>
KB5YVT@aol.com wrote:
>
> Anyone know if someone makes a BIG PL-259 that 1/2 inch hardline will fit
> into? Want to connect direct without expensive connectors.
>
> Thanks Mike KB5YVT aka. W5NN
>
> Please send direct to me and not reflector.
>
> kb5yvt@aol.com
Assuming you are talking about 1/2" Heliax (LDF4-50A), the fittings
can be bought from a lot of sources (Andrew, DB Products, etc) as
L44P for male UHF and L44U for female UHF.
These are fairly spendy, and at HF, you can make fittings from 1/2"
copper swaet joints (water fittings) and regular PL-259 or SO-239
conectors. The impedance hump at 28 mHz is not bad, and sure beats
$30.00 each for the commercial jobs.
de KL7HF
>From jreid@aloha.net (Jim Reid) Wed Aug 14 17:50:34 1996
From: jreid@aloha.net (Jim Reid) (Jim Reid)
Subject: April 4th 1997 International DX Convention
Message-ID: <1.5.4.32.19960814165034.00679d2c@aloha.net>
At 10:26 AM 8/13/96 -0700, you wrote:
>>Hi Jim,
>
>I believe the goal is to hold the convention within one week of Dayton. This
>year the committee had a problem obtaining the desired date. I'm certain you
>will see a change for future convention dates.
>
>73, Len, K6ANP
OK Len,
Was sort of planning for both for next Spring, might just
put off Dayton until a year that both are just a week apart. Probably
won't be too much new stuff at Dayton '97 anyway. Looking forward
to seeing the new next generation rigs from Ten Tec and the others
as the sunspots begin to pick up. Will probably not be significantly
up until 98 at least, when new rigs can make impact and attract a
lot of upgrade buyers. Obviously, where I live, I cannot buy a
load of stuff at the big flea market and tote it home. I had to buy
an extra two suitcases in '94, last Dayton I attended, because of
over zealous bargain buying that Spring in Dayton!!
Thanks for your note, and 73, Jim, AH6NB
On the Garden Island of Kauai ( dowager Queen Emma, widowed
in 1864 by the death of her husband, King Kamehameha IV. came
to Kauai, and began to plant a garden. She called Kauai, her Garden
Island, and the name has remained ever since. The site of her gardens
is now the Congressionally chartered National Tropical Botanical
Gardens, and is centered about 3/4 mile from this QTH. Very
glad to say with the kamaainas, "Good to live Kauai!".
>From aa9ax@iglou.com (Steven Sample) Wed Aug 14 19:57:52 1996
From: aa9ax@iglou.com (Steven Sample) (Steven Sample)
Subject: Kudos For Billy Lunt
Message-ID: <Pine.GSO.3.93.960814144907.19166A-100000@iglou>
Just for the record:
After reading the comments that follow, I too feel that Billy has been
responsive to me on several occasions, and has always been friendly and
helpful. He even took the time to personally help correct some problems
on the way I was sending him logs several years ago (when I was green in
this contest stuff). Have also met him personally, including dinner at
Dayton this year with my son Palmer/N9JRZ, Dr. Bafoofnik/W9XR, the Green
Hornet/W3GH, and Doc/KN8Z, and others. We had a very fine time, and there
was no real "dirt" brought to the surface about him or his
character...only small, relatively unimportant and trivial mistakes that
we all pledged to retain in secrecy; therefore I am unable to divulge them
here on the reflector.
Billy has my vote to continue his reign as intergalactic contesting
manager.
Steve (Slim Whitman) / AA9AX
*****************************************************************************
On Tue, 13 Aug 1996, Jay O'Brien - W6GO wrote:
> >
> > Yesterday, at 1818 Eastern Time, I sent some e-mail to Billy Lunt (ARRL's
> > Contest Manager) regarding a problem with a just-received certificate.
> >
> > Billy's response, correcting the problem, was transmitted at 0916 this
> > morning.
> >
> > Now that's SERVICE, and I thought a public "thank you" was in order.
> >
> > 73, Walt, AC1O
> >
> >
> Congratulations!
>
> I requested a replacement certificate from Billy via fax on 5/1/93 for a
> certificate sent for SS with one of my operators' calls incorrect. No
> answer. I sent a followup fax on 1/30/94. No answer. My director asked
> him to replace the certificate. No answer. I'm still waiting, but
> believe me I'm not holding my breath.
>
> To his credit, he did replace a previous error which awarded us "FISRT
> PLACE" with one that read "FIRST PLACE".
>
> There are many other examples of problems with the ARRL Contest desk, and
> my interest in ARRL contests has declined as a result. It seems that the
> attitude of the Contest desk is "it's only a contest, therefore it's not
> important".
>
> Perhaps as an east coaster you get responses from Billy. I'm happy for you.
>
> 73, Jay
> w6go@netcom.com
>
>From HWDX09A@prodigy.com ( ROBERT REED) Wed Aug 14 20:26:05 1996
From: HWDX09A@prodigy.com ( ROBERT REED) ( ROBERT REED)
Subject: Radio Shack Headphones
Message-ID: <199608141826.OAA28902@mime4.prodigy.com>
Tony,
I'm not impressed with the Radio Shack headset but back a few years
ago several of us operating W1AW in the IARU complained of the
headphone quality of the lightweight Heil's. During the following
year the Radio Shack PRO-25 Titanium headphones went on sale. The
audio quality for music was to say the least excellent. Next came a
try on the HF rig and they again had a real good sound. Next came a
1/4 inch bolt in the PRO-25 emblem in the headband and onto it went
the Heil blue plastic piece that comes with the seperate boom
microphone. The plastic piece is made to match with 1/4 inch hardware
with a recessed groove for the washer even.
Since then several friends have made these headsets though the coming
of the Heil ProSet has cut back the number of people using the
lightweight type.
The Radio Shack PRO-25 does have a built-in gain control for multiple
users but a complaint of high frequency hiss by W1JR was eliminated
by removing the gain control.
The Radio Shack PRO-25 is made by KOSS and is a quality headphone.
It's marraige with a Heil boom make for a useful combination though I
can expect others to have other personal preferences. When this was
later discussed on packet there were several different suggestions
for full size headphones that people had made headsets with. I too
have 3 different full size headsets with Heil booms on them. Onlt the
PRO-25 seems to be a worthwhile lightweight style from my experience.
____
73, Bob Reed, WB2DIN
1991 Route 37 West - Lot 109
Toms River, New Jersey 08757
Internet : hwdx09a@prodigy.com
wb2din@juno.com
Packet : wb2din@wt3v.nj
>From fflynn@together.net (Francis Flynn) Wed Aug 14 20:56:30 1996
From: fflynn@together.net (Francis Flynn) (Francis Flynn)
Subject: Contest Laptops
Message-ID: <Pine.SOL.3.91.960814155448.9053A-100000@sequoia>
Sorry to have to do this, but I get no response from
"cq-contest-request@tvg.com". Could someone help unsubscribe from this list?
Sorry for the increase in S/N, I know I hate it when other people do this.
73
http://together.net/~fflynn
Francis Flynn, fflynn@together.net
ARS:KM1Z
>From aa4lr@radio.org (Bill Coleman) Wed Aug 14 21:10:00 1996
From: aa4lr@radio.org (Bill Coleman) (Bill Coleman)
Subject: Headsets
Message-ID: <960714160844.QAA17373@gate.iterated.com>
>From: Steve Sacco KC2X, kc2x@nebula.ispace.com
>
>Has anyone ever looked at using aviation headphones for CONTEST use?
As the owner of no less than three sets of aviation headsets, I've
thought of it.
>I have no idea what the impedance of these this are, but they always look
>very well made!
As the price usually denotes.
One problem with aviation headsets is that more of a premium is placed on
noise suppression and less on comfort. Since your typical GA plane has an
endurance of 3-6 hours, comfort isn't nearly as big an issue. But after
3-5 hours of wearing these headsets, you'll be happy to remove them.
Aviation headsets are typically bulky, uncomfortable and expensive.
Peltor makes some very nice, light headsets. (I have a set of their
hearing protectors -- VERY nice)
Most headset speakers are low-impedance (4-8 ohm). The microphones are
designed to emulate carbon mics (most are electrets these days, but the
interface to the radios dictates carbon microphones), so a small dc
voltage must be applied to "power" the microphone.
>Plus, many of them have active noise cancellation to reduce shack (I mean
>cockpit) noise. It seems like a natural.
Even the noisiest of amplifier fans can't compare with the sound and
vibration in light aircraft. You don't need active cancellation unless
your shack has some serious problems.
I've found that inexpensive stereo headsets work great for contests. They
are lightweight, comfortable and tend to mask out the noise.
Bill Coleman, AA4LR Mail: aa4lr@radio.org
Quote: "Not in a thousand years will man ever fly!"
-- Wilbur Wright, 1901
>From stevens@comsys.net (Walt Stevens) Wed Aug 14 20:36:43 1996
From: stevens@comsys.net (Walt Stevens) (Walt Stevens)
Subject: Callsign Info
Message-ID: <32122ACB.3741@comsys.net>
I need the callsign data on the following callsign <YU1YV>
Tnx-Walt-KD9TO
>From kf3p@cais.cais.com (Tyler Stewart) Wed Aug 14 23:57:57 1996
From: kf3p@cais.cais.com (Tyler Stewart) (Tyler Stewart)
Subject: Everything you thought you knew about Rohn 45G wind loading is WRONG
Message-ID: <199608142257.SAA09295@cais.cais.com>
ms are not used. In other words, Rohn has deducted 8.0 square feet already
>from the tower loading figure and the number that is on each drawing is the
>NET tower load. For amateur loading, you can ADD the 8.0 square feet onto
>the posted figure to come up with a more appropriate wind load number. This
>same situation applies to 55G as well.
>
> One note of caution; Rohn states that the side arms are "symmetrically
>placed" meaning the load is distributed over the whole tower, not just on the
>top. While it may not be appropriate to add the whole 8.0 square feet to the
>top of the tower, it does show that there is additional tower capacity
>available that is not obvious from the number in the box. Maybe you do learn
>something everyday.
>
> Comments?
By symmetrical, I think they mean that you dont put them all on one face of the
tower ie they are set in a triangle around the tower to eliminate a twisting
load on the tower. I'm sure you can figure on that whole 8 at the top of the
tower (but maybe not 10 feet above the top!)
However, in reality, these towers will handle a whole lot more than the book
ratings. It's amazing the stories I hear...
However, I'd get a PE to sign off on any installation that exceeds the apparent
ratings from the Rohn catalog of drawings.
Also note that the EIA standard was recently updated to RS-222E. I have no
idea the implications, but it may (probably does) invalidate the book ratings/
drawings.
>
>73, Steve K7LXC
>
> TOWER TECH -- professional tower supplies and services for amateurs
>
>
73, Tyler KF3P
---------------------------------------------------------------------------
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>From w7ni@teleport.com (Stan Griffiths) Wed Aug 14 21:30:27 1996
From: w7ni@teleport.com (Stan Griffiths) (Stan Griffiths)
Subject: RF Exposure & Cellular Phones
Message-ID: <199608142030.NAA25930@desiree.teleport.com>
>On Tue, 13 Aug 1996, Stan Griffiths wrote:
>
>> So how come
>> there does not seem to be IMMENSE CONCERN over radios that you actually wear
>> on your body?? (cell phones and handhelds) You can't get much closer than
>> that and the field intensities have to be very large even at just a few
>> watts of power.
>>
>> This argument may only get us into deeper trouble, but I would suggest that
>> it might cause a re-examination of the risks associated with handhelds
>> (including cell phones). If we hams are going to risk getting into trouble
>> over this, I damn sure want to drag the cell phone companies right into the
>> muck with us. At least they have the funding to defend themselves and if
>> they lose (impossible!), the loss of cell phone conveniences will be
>> devastating to the general public (which is why they CAN'T lose).
>>
>
>The answer is, of course, that they have ALREADY wriggled their way out of
>being covered by this set of rules. There is no way that they were not
>aware of this set of proposed regulations and applied the necessary
>pressure to be exempted.
>
>I wish that they had NOT be exempted, because then the cellular industry
>might have been our unwitting champion, as was Marconi to the hams so many
>years ago. With their pressure and clout, we might have had a chance to
>avoid the whole set of rules, at least for intermittent transmissions.
>Now...sigh...we are all by our lonesome.
>
>73, Ward N0AX
Hi Ward,
Maybe a good use of our time would be to work on getting them UNexempted
since a cell phone exemption seems to defy reason. It is sort of a "back
door" approach and reminds me of a political smear campaign, but damnit, it
sometimes works.
It also reminds me of our attempts down here to bring reason into local
tower legislation. The opposition pointed out how "dangerous" towers were
since they could fall down and hurt someone or something. We pointed out
that trees are FAR more dangerous and when you examine the damage that has
actually been done by falling trees as opposed to towers, it is at least
thousands to one. A "tree ordinance" would make vastly more sense than a
"tower ordinance" if protection of life and property is really an issue.
The County Commissioners found it very easy to ignore our argument despite
its very sound basis in facts.
Still, if we don't at least TRY this type of argument, we have not explored
all the avenues.
Stan w7ni@teleport.com
PS Maybe we need to start at a lower level . . . like trying to get a
minimum IQ level qualification for Commissioner eligibility . . . has to be
at least 50.
>From ah3c@burgoyne.com (PETER GRILLO) Thu Aug 15 06:11:39 1996
From: ah3c@burgoyne.com (PETER GRILLO) (PETER GRILLO)
Subject: Summary: Tower Help (long)
Message-ID: <199608142319.RAA26009@burgoyne.com>
At 02:33 AM 8/12/96 -0400, you wrote:
>In terms of concrete it looks like I will be taking the easy way out - pay
>the man and have it delivered. Cost including setup should be $100 - $150.
Smart move!
Summer, 1970 is a time I will never forget! I thought I could save money by
getting the gravel, sand, and cement dumped in my driveway. I started early
in the morning mixing the ingredients in the wheelbarrow and pushing the mix
to the back yard to dump it into the hole. Back and forth all day long,
hunched over...mix, haul, pour. When dinner time came, project almost done,
I attempted to stand erect and simply couldn't without excruciating pain in
my back. I had to stop and lay down on my back, propped up, with my legs
folded. The next morning, I was unable to move.
The doctor told me that I had damaged a disc in my back and he would have to
wait until the swelling went down before he could fully analyze the
situation. After 3 days of rest, his next diagnosis told me that I had
permanently damaged my back and that I had two choices: live with it or
have surgery. I chose to live with it, 50% success rate did not appeal to me.
For 13 more years, I slept with my back and legs propped up. Then, I
damaged it again while climbing a ladder and reaching over my head. This
time, after more resting periods, I went to another back specialist who
worked on me for 6 months to bring me to a near normal condition.
My lifting limit is still only 40 pounds (for less than 1 minute), but I now
understand the importance of letting the professionals do the tough jobs.
They have the tools and the training!
73, Pete AH3C
>From k6ll@juno.com (David O. Hachadorian) Thu Aug 15 08:23:12 1996
From: k6ll@juno.com (David O. Hachadorian) (David O. Hachadorian)
Subject: world's ugliest headset
Message-ID: <19960814.232314.4951.0.k6ll@juno.com>
Here is how to make the world's ugliest headset:
1. Take a 1 foot piece of #14 bare copper wire.
tightly wrap about 4 inches of it around the
headband of your favorite headphones, just above
the left earpiece. I use Radio Shack Nova 45's.
They sound pretty good, are comfy and inexpensive,
and have a nice long cord.
2. Solder a shiny penny onto the 8 inch free end of the
copper wire.
3. Attach a Heil HC-4 element to the penny with hotmelt
glue. While the glue gun is hot, put a blob where the
copper wire attaches to the headset. Stick some
acoustic foam or other porous material onto the HC-4.
Run RG-174 from the HC-4, securing it to the copper wire,
the headband, and the headphone wire with tiewraps.
It's ugly, but it gives you total freedom to pick your
favorite headphones.
Dave, K6LL
k6ll@juno.com
|