[Repeater-Builder] Re: Rohn 25g Tower

[Greg Beat]

IF you use the short 25G tower section (~ 4 feet) in the hole (this is one 
approved approach) -- 
make ABSOLUTELY sure that the bottom of the hole permit drainage of water 
(small sized gravel in bottom of hole) -- the hollow tower legs/tubes into the 
hole MUST permit drainage of water captured by tower inside tower legs/tubing. 

In the Midwest, I have seen a towers that the metal legs EXPLODED (cracked) 
above the concrete pad due to ICE thaw and freeze -- each problem was found to 
be either plastic plugs (used in shipping) not removed and/or concrete plugging 
the bottom of the 3 tower legs/tubes. VERY EXPENSIVE to break-up and pull-out 
the mess and re-work (one was a comemrical tower, the other a residental)

Greg
w9gb

RE: [Repeater-Builder] Rohn 25g Tower

[n9wys]

Nope - 190 feet, that way he doesn't have to content with FAA registry. ;-p

Mark - N9WYS

-Original Message-
From: Repeater-Builder@yahoogroups.com On Behalf Of Chuck Kelsey

Forget the Rohn 25G and house bracket...

Get a 200' Rohn SSV free-standing tower and live in a tent nearby.

Chuck
WB2EDV 

Re: [Repeater-Builder] Rohn 25g Tower

[MCH]

Actually, if the tower is designed to be self-supporting, anchoring it
anywhere could compromise the structural integrity. It's designed to
give some across the entire structure, and if you tie one point to a
fixed point, it will flex more at that point and eventually could fail
there - much like flexing a piece of wire in one point too much.

Joe M.

Jack Taylor wrote:
> 
> Depending upon the wind loading on the tower, I would be cautious about
> fastening *anything* to the fascia board of a modern day house!  If your
> tower
> is self supporting, design the base to handle the load.  Don't rely on the
> house
> else over time you may end up with cracks in the interior walls.  If the
> tower
> is to by guyed, don't use the house for an anchor :-)
> 
> But on the otherhand if it is a short tower with little wind load, have at
> it!
> 
> Jack  -  N7OO
> 
> - Original Message -
> From: Eric Lemmon
> To: Repeater-Builder@yahoogroups.com
> Sent: Sunday, July 29, 2007 6:36 PM
> Subject: RE: [Repeater-Builder] Rohn 25g Tower
> 
> Don,
> 
> As others have mentioned, it is best to first attach the house bracket to
> the house, and then install the tower.
> 
> I did exactly that at my house, with a 25G tower comprising two 10-foot
> sections and a 5-foot embedment section. Once I knew roughly where the
> tower would be, I put a 50-inch section of heavy aluminum channel behind the
> fascia board, and lag-bolted it to each of four roof trusses. I then
> drilled through the fascia board and the aluminum channel for several
> 3/8-inch stainless steel bolts to hold the house bracket solidly to the
> fascia board. Then I set a tower section in place to see where the hole
> needed to be, with the section perfectly plumb. Once the hole was dug per
> Rohn's foundation drawing, I added the rebar and set the embedment section
> in place with one tower section clamped into the house bracket. After
> triple-checking that the tower was plumb, I poured the concrete. Although I
> bought an electric concrete mixer from Harbor Freight just for this job,
> after going through 26 ninety-pound bags of ready-mix concrete, I was
> pooped! If I ever do this again, I am gonna hire a ready-mix truck and a
> concrete pumper to do the work.
> 
> 73, Eric Lemmon WB6FLY
> 
> -Original Message-
> From: Repeater-Builder@yahoogroups.com
> [mailto:[EMAIL PROTECTED] On Behalf Of Don KA9QJG
> Sent: Sunday, July 29, 2007 3:26 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: [Repeater-Builder] Rohn 25g Tower
> 
> On a Rohn 25g Tower that will be put on the Side of the House can anyone
> Tell Me if the Rohn House Bracket Has to be Mounted First, or can the Tower
> Be put up First.
> 
> Thanks Don
> 
> KA9QJG
> 
> 
> Yahoo! Groups Links
> 
> 
> 

RE: Re: [Repeater-Builder] Re: 4 meters

[Richard]

Exactly... We only "sort of" have that band.
 
Richard
  www.n7tgb.net
 

  _  

From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Kris Kirby
Sent: Sunday, July 29, 2007 5:01 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: Re: [Repeater-Builder] Re: 4 meters



On Sun, 29 Jul 2007, Ron Wright wrote:
> So concentrating on our other VHF and UHF bands is needed. I am 
> really surprised we still have 30 MHz on the 420-450 band.

One only need look at PAVE-PAWS

--
Kris Kirby, KE4AHR <[EMAIL PROTECTED]  us>
* WAR IS PEACE * FREEDOM IS SLAVERY *
* IGNORANCE IS STRENGTH * KETCHUP IS *
* A VEGETABLE *



 

Re: [Repeater-Builder] Rohn 25g Tower

[georgiaskywarn]

On my tower we put the Rohn tower bracket through the wall of the
garage.  Dug the hole under the bracket. (3 or 4ft?)  Stood 20 ft of
the tower in the hole and then poured the concrete.  50 ft tower with
bracket at 10ft (the above mentioned), then bracketed at 20ft on the
2nd story.  30ft above the house.
Good Luck!
Robert

Re: [Repeater-Builder] Rohn 25g Tower

[Steve S. Bosshard (NU5D)]

I tried something a little different in fastening a house bracket.  I
took 2, 4 Ft lengths of 3/8" all thread rod.  I welded one end of each
all thread to 1/2 of a 5" X 7" X 1/4" steel purlin clip.  A purlin clip
is a flat soft steel plate used to join 2 red iron steel purlins.

After welding, the contraption looked like an oversized fly swatter.  I
then drilled 2 holes in the fascia and ran the all thread from the attic
outside the house thru the fascia board.  Next I ran 2, 1/4" X 2 1/2"
bolts thru each clip (plate against the truss) with the bolts going thru
the truss and thru the clip.  I used flat washers on the wood side of
the truss.

This allowed the all thread rods, securely fastened to the truss to go
outside the fascia for attachment of the house bracket.

I believe this gives a little more strength to the attachment.  The
tower was pretty much self supporting to begin with, but this gave an
extra measure of safety.

At 90 mph wind, each foot in length of the tower has 113 pounds of force
exerted by the wind.  This can be a formidable amount of force.

Best success and 73,  Steve NU5D


Jack Taylor wrote:
> Depending upon the wind loading on the tower, I would be cautious about
> fastening *anything* to the fascia board of a modern day house!  If your
> tower
> is self supporting, design the base to handle the load.  Don't rely on the
> house
> else over time you may end up with cracks in the interior walls.  If the
> tower
> is to by guyed, don't use the house for an anchor :-)
>
> But on the otherhand if it is a short tower with little wind load, have at
> it!
>
> Jack  -  N7OO
>
>   

Re: [Repeater-Builder] Rohn 25g Tower

[Barry C']

>From: "Chuck Kelsey" <[EMAIL PROTECTED]>
>Reply-To: Repeater-Builder@yahoogroups.com
>To: 
>Subject: Re: [Repeater-Builder] Rohn 25g Tower
>Date: Sun, 29 Jul 2007 21:53:42 -0400
>
>Forget the Rohn 25G and house bracket...
>
>Get a 200' Rohn SSV free-standing tower and live in a tent nearby.
>
>Chuck
>WB2EDV
Or buy 30 acres and use the trees , you cant beat a rhombic .

_
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Re: [Repeater-Builder] Rohn 25g Tower

[Jack Taylor]

Depending upon the wind loading on the tower, I would be cautious about
fastening *anything* to the fascia board of a modern day house!  If your
tower
is self supporting, design the base to handle the load.  Don't rely on the
house
else over time you may end up with cracks in the interior walls.  If the
tower
is to by guyed, don't use the house for an anchor :-)

But on the otherhand if it is a short tower with little wind load, have at
it!

Jack  -  N7OO

- Original Message - 
From: Eric Lemmon
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, July 29, 2007 6:36 PM
Subject: RE: [Repeater-Builder] Rohn 25g Tower


Don,

As others have mentioned, it is best to first attach the house bracket to
the house, and then install the tower.

I did exactly that at my house, with a 25G tower comprising two 10-foot
sections and a 5-foot embedment section. Once I knew roughly where the
tower would be, I put a 50-inch section of heavy aluminum channel behind the
fascia board, and lag-bolted it to each of four roof trusses. I then
drilled through the fascia board and the aluminum channel for several
3/8-inch stainless steel bolts to hold the house bracket solidly to the
fascia board. Then I set a tower section in place to see where the hole
needed to be, with the section perfectly plumb. Once the hole was dug per
Rohn's foundation drawing, I added the rebar and set the embedment section
in place with one tower section clamped into the house bracket. After
triple-checking that the tower was plumb, I poured the concrete. Although I
bought an electric concrete mixer from Harbor Freight just for this job,
after going through 26 ninety-pound bags of ready-mix concrete, I was
pooped! If I ever do this again, I am gonna hire a ready-mix truck and a
concrete pumper to do the work.

73, Eric Lemmon WB6FLY


-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Don KA9QJG
Sent: Sunday, July 29, 2007 3:26 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Rohn 25g Tower

On a Rohn 25g Tower that will be put on the Side of the House can anyone
Tell Me if the Rohn House Bracket Has to be Mounted First, or can the Tower
Be put up First.

Thanks Don

KA9QJG

Re: [Repeater-Builder] Rohn 25g Tower

[Chuck Kelsey]

Forget the Rohn 25G and house bracket...

Get a 200' Rohn SSV free-standing tower and live in a tent nearby.

Chuck
WB2EDV

RE: [Repeater-Builder] Micor Mobile Radio Connector

[Eric Lemmon]

Ray,

It's neither.  The Motorola Micor radio connector is proprietary, and
comprises 35 flat pins- 22 of them horizontal and 13 of them vertical- and
two large round power pins.  The connector body is rectangular, and measures
about 1" by 1.75".

73, Eric Lemmon WB6FLY
 

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Ray Brown
Sent: Saturday, July 28, 2007 2:33 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Micor Mobile Radio Connector

- Original Message - 
From: "Eric Lemmon" <[EMAIL PROTECTED]  >

> FYI: The 37-contact female connector that plugs into the front of a Micor
> mobile radio is still available from Motorola Parts. It is Part Number
> 0184307A89, for about $55. The obsolete part number for this plug is
> 1V84307A89.

Question - is this defined as a Sub-D-37, or as a "high-density" 37 ?
If it's only 2 rows of pins, 19 above 18, then I can still get sockets and
cables for this connector, as it's commonly used in Hill-Rom hospital beds.
But if it's the high-density one, with 3 rows of pins, I've seen it on some
other things but not lately, on other medical equipment.

Just thought I'd toss that in. :-)

_Ray_ KBØSTN

RE: [Repeater-Builder] Rohn 25g Tower

[Eric Lemmon]

Don,

As others have mentioned, it is best to first attach the house bracket to
the house, and then install the tower.

I did exactly that at my house, with a 25G tower comprising two 10-foot
sections and a 5-foot embedment section.  Once I knew roughly where the
tower would be, I put a 50-inch section of heavy aluminum channel behind the
fascia board, and lag-bolted it to each of four roof trusses.  I then
drilled through the fascia board and the aluminum channel for several
3/8-inch stainless steel bolts to hold the house bracket solidly to the
fascia board.  Then I set a tower section in place to see where the hole
needed to be, with the section perfectly plumb.  Once the hole was dug per
Rohn's foundation drawing, I added the rebar and set the embedment section
in place with one tower section clamped into the house bracket.  After
triple-checking that the tower was plumb, I poured the concrete.  Although I
bought an electric concrete mixer from Harbor Freight just for this job,
after going through 26 ninety-pound bags of ready-mix concrete, I was
pooped!  If I ever do this again, I am gonna hire a ready-mix truck and a
concrete pumper to do the work.

73, Eric Lemmon WB6FLY
  

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Don KA9QJG
Sent: Sunday, July 29, 2007 3:26 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Rohn 25g Tower

On a Rohn 25g Tower that will be put on the Side of the House can anyone
Tell Me if the Rohn House Bracket Has to be Mounted First, or can the Tower
Be  put up First.

 

Thanks Don 

 

KA9QJG

Re: [Repeater-Builder] Re: 4 meters

[Jack Taylor]

- Original Message - 
From: Ron Wright
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, July 29, 2007 3:55 PM
Subject: Re: [Repeater-Builder] Re: 4 meters

."Washington can give direct support to a mission 10,000 miles
away."

And that's the problem!

Jack  -  N7OO

73, ron, n9ee/r

RE: [Repeater-Builder] Rohn 25g Tower

[Bill Hudson]

If your life is in perspective, you build the tower first.  Then you attach
the brackets to the tower.

Then you build the house.

Bill - W6CBS

At 06:25 PM 7/29/2007, you wrote:

>On a Rohn 25g Tower that will be put on the Side of the House can 
>anyone Tell Me if the Rohn House Bracket Has to be Mounted First, or 
>can the Tower Be put up First.
>
>
>
>Thanks Don
>
>
>KA9QJG
> 

BEGIN:VCARD
VERSION:2.1
N:;W6CBS
FN:W6CBS
ORG:Hudson Sports Productions
TITLE:Broadcast Engineer
TEL;WORK;VOICE:1-650-595-5566
TEL;PREF:1-650-595-5566
ADR;WORK:;1-650-595-5566;P O Box 7143;San Carlos;California;94070;USA
LABEL;WORK;ENCODING=QUOTED-PRINTABLE:1-650-595-5566=0D=0AP O Box 7143=0D=0ASan Carlos, California 94070=0D=0AUSA
EMAIL;PREF;INTERNET:[EMAIL PROTECTED]
REV:20060508T165031Z
END:VCARD

Re: Re: [Repeater-Builder] Re: 4 meters

[JOHN MACKEY]

That is the point that I am attempting to make, that 4 meters will have little
interest to most commecial users.  They usually want UHF and above.

But one thing I didn't originally think of, that only the full service
stations will be required to go dark on analog in 2009.  Apparently
translators and low-power TV will still be allowed to operate analog.

-- Original Message --
Received: Sun, 29 Jul 2007 06:55:12 PM CDT
From: Ron Wright <[EMAIL PROTECTED]>
To: Repeater-Builder@yahoogroups.com
Subject: Re: Re: [Repeater-Builder] Re: 4 meters

> Gary has a hidden point.
> 
> Often the FCC will give Hams spectum no one wants such as 60 meters (5 MHz)
and then take something like 220 or other VHF/UHF.  They have been reducing
our level of use in some of the UHF bands and taking spectrum in the GHz
bands.  Of course now few go above 1 GHz...well above 1.3 GHz.
> 
> So concentrating on our other VHF and UHF bands is needed.  I am really
surprised we still have 30 MHz on the 420-450 band.
> 
> Not sure, but I would think 4 meters would have little interest to
commerical users so might be good thing to look at.  I will be glad when the
AM broadcast finally move out of 40 meters.
> 
> 73, ron, n9ee/r

Re: Re: [Repeater-Builder] Re: 4 meters

[Chuck Kelsey]

Some of us lost 420-430 MHz quite some time ago. It's used for land mobile 
in the Buffalo, Cleveland and Detroit areas.

Chuck
WB2EDV



- Original Message - 
From: "Kris Kirby" <[EMAIL PROTECTED]>
To: 
Sent: Sunday, July 29, 2007 8:00 PM
Subject: Re: Re: [Repeater-Builder] Re: 4 meters


> On Sun, 29 Jul 2007, Ron Wright wrote:
>> So concentrating on our other VHF and UHF bands is needed.  I am
>> really surprised we still have 30 MHz on the 420-450 band.
>
> 

Re: Re: [Repeater-Builder] Re: 4 meters

[Kris Kirby]

On Sun, 29 Jul 2007, Ron Wright wrote:
> So concentrating on our other VHF and UHF bands is needed.  I am 
> really surprised we still have 30 MHz on the 420-450 band.

One only need look at PAVE-PAWS

--
Kris Kirby, KE4AHR  <[EMAIL PROTECTED]>
* WAR IS PEACE *  FREEDOM IS SLAVERY *
* IGNORANCE IS STRENGTH * KETCHUP IS *
  * A VEGETABLE *

Re: [Repeater-Builder] Re: 4 meters

[Ron Wright]

For decades the US military has used 30-75 MHz as its ground operations bands.  
This is the main band used by military ground forces.  They do stay away from 
most of other service uses, but when needed they use whatever they want in this 
spectrum.  It is 25 kHz dev FM.

The military is moving more to sat comm due to its security of a small dish on 
the ground pointed up and hard to intercept and they can link up to about any 
where in the world.  Washington can give direct support to a mission 10,000 
miles away.

73, ron, n9ee/r



>From: ensemble953039 <[EMAIL PROTECTED]>
>Date: 2007/07/29 Sun PM 03:53:55 CDT
>To: Repeater-Builder@yahoogroups.com
>Subject: [Repeater-Builder] Re: 4 meters

>  
>Hi,
>   the "green hats" are the military and although we here in the U.K.
>do have the 4m band it is at the top end of the "Tac" military band.
>We don't seem to be bothered by them or them by us as we also 
>share that part of the spectrum with commercial interests,so with 
>all interests interwoven we all seem to get along.
>
>Adam g8umx
>
>--- In Repeater-Builder@yahoogroups.com, "JOHN MACKEY" <[EMAIL PROTECTED]> 
>wrote:
>>
>> What are "green hats"?
>> 
>> -- Original Message --
>> Received: Sun, 29 Jul 2007 08:40:17 AM CDT
>> From: Geert Jan de Groot <[EMAIL PROTECTED]>
>> To: [EMAIL PROTECTED]: [EMAIL PROTECTED]
>> Subject: Re: [Repeater-Builder] 4 meters
>> 
>> > On 29 Jul 2007 10:39:32 -  Repeater-Builder@yahoogroups.com 
>wrote:
>> > > I was just wondering if anyone had heard any actions to get 
>amateurs 
>> > > access to 4 meters (like European hams) once analog television 
>goes dark?
>> > 
>> > There's only a limited set of European hams who have access to 4 
>meters. 
>> > Analogue television went dark here (the Netherlands) 7 months 
>ago, 
>> > and the request was made, but the regulator turned it down: 
>> > the frequency was shared with green hats, and the're not letting 
>go.
>> > 
>> > Would be nice, though.
>> > 
>> > 73, 
>> > 
>> > Geert Jan PE1HZG
>> >
>>
>
>


Ron Wright, N9EE
727-376-6575
MICRO COMPUTER CONCEPTS
Owner 146.64 repeater Tampa Bay, FL
No tone, all are welcome.

Re: Re: [Repeater-Builder] Re: 4 meters

[Ron Wright]

Gary has a hidden point.

Often the FCC will give Hams spectum no one wants such as 60 meters (5 MHz) and 
then take something like 220 or other VHF/UHF.  They have been reducing our 
level of use in some of the UHF bands and taking spectrum in the GHz bands.  Of 
course now few go above 1 GHz...well above 1.3 GHz.

So concentrating on our other VHF and UHF bands is needed.  I am really 
surprised we still have 30 MHz on the 420-450 band.

Not sure, but I would think 4 meters would have little interest to commerical 
users so might be good thing to look at.  I will be glad when the AM broadcast 
finally move out of 40 meters.

73, ron, n9ee/r






>From: Gary <[EMAIL PROTECTED]>
>Date: 2007/07/29 Sun PM 05:08:38 CDT
>To: Repeater-Builder@yahoogroups.com
>Subject: Re: [Repeater-Builder] Re: 4 meters

>  
>Ed's point was that the FCC can and will sell some part of an amateur 
>bandunder the right circumstances. Given the FCC's tendency to auction 
>spectrumthese days amateurs should focus more on vigorously protecting the 
>spectrumwe have vs. expecting more just because another service has moved out.
>Gary
>Larry Wagoner wrote:At 07:42 AM 7/29/2007, you wrote:Remember UPS's 
>brainchildcirca 1988-90 - petitioning the FCC for 220 spectrum for nationwide 
>data- -
>
>Just one thing ...
>The 220 Mhz area is NOT 4-meters.
>It is 1.25 meters ...
>Larry
>N5WLW


Ron Wright, N9EE
727-376-6575
MICRO COMPUTER CONCEPTS
Owner 146.64 repeater Tampa Bay, FL
No tone, all are welcome.

RE: [Repeater-Builder] Rohn 25g Tower

[Barry C']

I should have thought mounting the brkt is better , all to easy to mount 
after and discover you need to grind or shim. (unless you can measure 
ferpectly )

>From: "Don KA9QJG" <[EMAIL PROTECTED]>
>Reply-To: Repeater-Builder@yahoogroups.com
>To: 
>Subject: [Repeater-Builder] Rohn 25g Tower
>Date: Sun, 29 Jul 2007 17:25:32 -0500
>
>On a Rohn 25g Tower that will be put on the Side of the House can anyone
>Tell Me if the Rohn House Bracket Has to be Mounted First, or can the Tower
>Be  put up First.
>
>
>
>Thanks Don
>
>
>
>KA9QJG

_
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Re: [Repeater-Builder] Re: 4 meters

[Larry Wagoner]

At 05:12 PM 7/29/2007, you wrote:

Larry -
The example was for the aspect of the hams gettin gthe spectrum 
versus the "special interests" - not likely when big bucks are involved


I understood that ...
Just wanted to note that 220 Mhz is in 1.25, not 4 meters

Larry
N5WLW

[Repeater-Builder] Two DB224's to make up a DB228

[s3hampton]

Good day, John (KF0M) and others;

I was away all last week, and part of the previous, so I was
unable to give you a PROPER reply to your comments.  Others had
comments to add to my situation, but none really had as good of a
reference as you!

From your data on my "assembly" of two DB224 antennas as a DB228
array, I will make the phasing harness up with a 1/4 and a 3/4 wave
(after the velocity factor computation of my RG-11 coax).

I have a few other related questions, if you would please allow:


MY QUESTIONS:
1.  Is the FACTORY-MADE harness made up as with the RG-11 type coax
cables MOLDED onto the coax cables?  -Or, are the cable "legs" simply
made up, then attached to a coax-TEE?  (I want to make my own harness,
you see.  It is my plan to solder the RG-11 coax directly to the
required type N connectors.))

2.  It is my desire to have the top-most DB224 act as a bi-directional
antenna.  As such (with no real info), I have arranged the top-most
two elements so that they are directly in line with each other.  The
lower two elements are also directly in line with each other, but they
are are on the opposite side of the mast. (Elements 1 and 2 face
North; Elements 3 and 4 face South.) 
Or, should elements numbered 1 and 3 be facing North (as an
example) and elements number 2 and 4 be facing South?
-I have NOT put the new DB224 up, yet.

3.  I have no concrete plans for the lower DB224; It could remain as a
360 degree coverage, or I could set it up with elements 1 and 4 at
North and South, respectively; Elements 2 and 3 would then "span" one
side of the mast, soas to offer more of a carderoid (sp) pattern.  -In
this case, the elements would face 0, 60, 120 and 180 degrees.  (Your
suggestion, please?)

4.  It is my ASSUMPTION that the top-most DB224 be "right side up,"
and the lower DB224 be mounted upside-down.  Is this correct?
If this is the case, the lower DB224's elements will be "hot side
down," which is opposite from how the top-mounted DB224 has the
elements arranged.
If I mount the lower DB224 upside-down, will this retain water,
which will freeze and damage the antenna?  (Yes, the 1/4 and 3/4
wavelength phasing harness will insure a proper phase, so I will
actually realize GAIN.)

5.  The SPACING of the elements is far from "even; In my case, as well
as other reported element arrangements, I see from 60 to just over 70
inches of center-of-element to the next like point.  I had fully
expected to see an exact measurement!  I have a Cushcraft 4-bay
antenna, whose setup has all four elements at a fixed, and EQUAL
number of inches, +/- 1/8 inch!!  (I cannot locate the instruction
manual for my HyGain 4-bay J-Poles, but I am assuming that the
element-to-element spacing is the same (equal), and exact; These
examples are so very much different from what the DB224 units seem to
all be set up as.  So:  What is correct???  Is there some hidden magic
from the phasing harness and the seemingly inexact element placement
that actually allows a focus of the RF energy where it is needed? 
-Or, is this really an important factor??

6.  In looking at the pictures and diagrams of the DB228
documentation, I see that the images (as an example) show that the
top-most DB224's four elements are .75 inches
center-line-to-center-line.  I see the exact same for the four
elements on the lower DB224.  But, the centerline spacing of the
fourth element (lowest one) to the now-upper element of the lower
DB224 is somewhat more than 1.2 inches.  (?)  Is this actually
correct?  -Or are the pictures and the drawings simply made up by
someone other than an engineer?  Here again, I had assumed that the
element spacing "should be" even, and exactly the same!

Thank you in advance for your time and effort!!

73!

-Mike-
K0JTA

Re: [Repeater-Builder] Rohn 25g Tower

[Doug Bade]

I guess as long as you are spaced correctly it could be added 
afterwards, but I would do it first to make life simplergetting 
boring bits around the tower leg would be more annoying than it is 
worth... If you have the tower up, deal with it but if you have a 
choice :-)... just measure carefully so everything lines up correctly...

The house bracket will hold everything straight while the concrete 
sets if you do it right mount the brackets and drop plumb lines 
to figure out exactly where the tower hole/pad/concrete  needs to 
bea crooked tower will never fix itself

Doug
KD8B



At 06:25 PM 7/29/2007, you wrote:

>On a Rohn 25g Tower that will be put on the Side of the House can 
>anyone Tell Me if the Rohn House Bracket Has to be Mounted First, or 
>can the Tower  Be  put up First.
>
>
>
>Thanks Don
>
>
>KA9QJG
>
<>

RE: [Repeater-Builder] Rohn 25g Tower

[Doug Bade]

I think the idea is you want the legs of the 
tower to extend below the concrete into mother 
earth to keep lightning from arcing ( or trying 
to) through the concrete on the bottom if it gets 
a direct strike... Then add the appropriate 
grounding rods outside the concrete and it will 
not likely ever explode... the concrete is an 
anchor this way, not an insulator..

The ROHN installation notes have specific 
instructions they recommended as I recall...

Doug
KD8B


At 06:53 PM 7/29/2007, you wrote:

>
>
>Thanks everyone for the Fast answer. I thought 
>it was adjustable, I have Heard if You Sink a 
>Tower in the Ground 4-8 Ft With rebar and Pour 
>the Concrete If Lighting Strikes the Tower it 
>Can Explode in the Concrete even if You do put 
>out Ground Wires at the Base. And the Tower will 
>corrode Faster and the Galva -ionization will be 
>ate away.   Have No Idea if that’s True But 
>That what I wish to do., At 60 If it Last 10 Yrs I will be Happy .
>
>
>
>Thanks Don
>
>
>KA9QJG
>
>
<>

RE: [Repeater-Builder] Rohn 25g Tower

[Don KA9QJG]

Thanks everyone for the Fast answer. I thought it was adjustable, I have Heard 
if You Sink a Tower in the Ground 4-8 Ft With rebar and Pour the Concrete If 
Lighting Strikes the Tower it Can Explode in the Concrete even if You do put 
out Ground Wires at the Base. And the Tower will corrode Faster and the Galva 
-ionization will be ate away.   Have No Idea if that’s True But That what I 
wish to do., At 60 If it Last 10 Yrs I will be Happy . 

 

Thanks Don 

 

KA9QJG 
   
   

Re: [Repeater-Builder] Rohn 25g Tower

[Ron Wright]

Don,

It probably depends on which bracket you use.

Ones that I have used they come in verious sizes/distant from house/mount and 
are adjustable.  The bracket forms a U shape (with sharp corners) and a piece 
goes between the U that can be moved in and out.

I prefer to dig hole, put at least 3 pieces of tower up and clamp bracket.  I 
don't think bracket is continous, but holes in it for the cross peice so can 
adjust at about 1" intervals.  Once up line up tower and get in place where you 
want it and then pour base.  Then stack the rest of the tower if going higher.

73, ron, n9ee/r




>From: Don KA9QJG <[EMAIL PROTECTED]>
>Date: 2007/07/29 Sun PM 05:25:32 CDT
>To: Repeater-Builder@yahoogroups.com
>Subject: [Repeater-Builder] Rohn 25g Tower

>  
>
>On a Rohn 25g Tower that will be put on the Side of the House can anyone Tell 
>Me if the Rohn House Bracket Has to be Mounted First, or can the Tower  Be  
>put up First.
> 
>Thanks Don 
> KA9QJG 


Ron Wright, N9EE
727-376-6575
MICRO COMPUTER CONCEPTS
Owner 146.64 repeater Tampa Bay, FL
No tone, all are welcome.

RE: [Repeater-Builder] Rohn 25g Tower

[n9wys]

Don,

 

I put up my tower first, then mounted the bracket and affixed the tower to
it - THEN poured the concrete base.  (I buried 4' of tower.)  

 

Makes certain the tower it straight that way!

 

Mark - N9WYS

 

Disclaimer:  Not affiliated with any other N9WYS that you may know or might
ever have know.  Your mileage may vary. "I" before "E" except after "C."
Batteries not included.  Some assembly required.  Void where prohibited by
law.  That number again is: 800-328-7448; call now, operators are standing
by!  Objects in mirror are closer than they appear.  The call is coming from
inside the house.  Consult your attorney and accountant for your individual
tax situation.  Righty-tighty, lefty-loosey.  Do not recharge, put in fire
or disassemble.  Employees must wash hands before returning to work.  It's
ALWAYS the red wire (unless it's the black wire).  Copyright C 2007, N9WYS.
All Rights Reserved Worldwide.

  _  

From: Repeater-Builder@yahoogroups.com On Behalf Of Don KA9QJG

 

On a Rohn 25g Tower that will be put on the Side of the House can anyone
Tell Me if the Rohn House Bracket Has to be Mounted First, or can the Tower
Be  put up First.

 

Thanks Don 

 

KA9QJG  

[Repeater-Builder] Rohn 25g Tower

[Don KA9QJG]

On a Rohn 25g Tower that will be put on the Side of the House can anyone
Tell Me if the Rohn House Bracket Has to be Mounted First, or can the Tower
Be  put up First.



Thanks Don



KA9QJG

Re: [Repeater-Builder] Re: 4 meters

[Com/Rad Inc]

Larry - 
The example was for the aspect of the hams gettin gthe spectrum versus the 
"special interests" - not likely when big bucks are involved
Ed
  - Original Message - 
  From: Larry Wagoner 
  To: Repeater-Builder@yahoogroups.com 
  Sent: Sunday, July 29, 2007 7:57 AM
  Subject: Re: [Repeater-Builder] Re: 4 meters


  At 07:42 AM 7/29/2007, you wrote:


Remember UPS's brainchild circa 1988-90 - petitioning the FCC for 220 
spectrum for nationwide data - - 

  Just one thing ...
  The 220 Mhz area is NOT 4-meters.
  It is 1.25 meters ...

  Larry
  N5WLW



   

Re: [Repeater-Builder] Re: 4 meters

[Gary]

Ed's point was that the FCC can and will sell some part of an amateur
band under the right circumstances. Given the FCC's tendency to auction
spectrum these days amateurs should focus more on vigorously protecting
the spectrum we have vs. expecting more just because another service has
moved out.
Gary

Larry Wagoner wrote:

> At 07:42 AM 7/29/2007, you wrote:
>
>> Remember UPS's brainchild circa 1988-90 - petitioning the FCC for
>> 220 spectrum for nationwide data - -
>
>
> Just one thing ...
> The 220 Mhz area is NOT 4-meters.
> It is 1.25 meters ...
>
> Larry
> N5WLW

[Repeater-Builder] Re: 4 meters

[ensemble953039]

Hi,
   the "green hats" are the military and although we here in the U.K.
do have the 4m band it is at the top end of the "Tac" military band.
We don't seem to be bothered by them or them by us as we also 
share that part of the spectrum with commercial interests,so with 
all interests interwoven we all seem to get along.

Adam g8umx



--- In Repeater-Builder@yahoogroups.com, "JOHN MACKEY" <[EMAIL PROTECTED]> 
wrote:
>
> What are "green hats"?
> 
> -- Original Message --
> Received: Sun, 29 Jul 2007 08:40:17 AM CDT
> From: Geert Jan de Groot <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]: [EMAIL PROTECTED]
> Subject: Re: [Repeater-Builder] 4 meters
> 
> > On 29 Jul 2007 10:39:32 -  Repeater-Builder@yahoogroups.com 
wrote:
> > > I was just wondering if anyone had heard any actions to get 
amateurs 
> > > access to 4 meters (like European hams) once analog television 
goes dark?
> > 
> > There's only a limited set of European hams who have access to 4 
meters. 
> > Analogue television went dark here (the Netherlands) 7 months 
ago, 
> > and the request was made, but the regulator turned it down: 
> > the frequency was shared with green hats, and the're not letting 
go.
> > 
> > Would be nice, though.
> > 
> > 73, 
> > 
> > Geert Jan PE1HZG
> >
>

Re: [Repeater-Builder] Re: 4 meters

[Larry Wagoner]

At 07:42 AM 7/29/2007, you wrote:
Remember UPS's brainchild circa 1988-90 - petitioning the FCC for 
220 spectrum for nationwide data - -


Just one thing ...
The 220 Mhz area is NOT 4-meters.
It is 1.25 meters ...

Larry
N5WLW

[Repeater-Builder] Want Motorola R-2200b Service Monitor (parts or source for...)

[skipp025]

Re: Want Motorola R-2200b Service Monitor (parts or source for...) 

A friend has a sick Motorola R-2200b Service Monitor. He/we would 
like to locate any available parts source(s) and/or a dead unit 
to use as parts. 

Please reply direct if you can provide part source information or 
help in locating a surplus R-2200b for sale as-is for parts or 
refurbish. 

thanks much 
cheers, 
skipp 

skipp025 at yahoo.com 

Re: [Repeater-Builder] 4 meters

[JOHN MACKEY]

What are "green hats"?

-- Original Message --
Received: Sun, 29 Jul 2007 08:40:17 AM CDT
From: Geert Jan de Groot <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]: [EMAIL PROTECTED]
Subject: Re: [Repeater-Builder] 4 meters

> On 29 Jul 2007 10:39:32 -  Repeater-Builder@yahoogroups.com wrote:
> > I was just wondering if anyone had heard any actions to get amateurs 
> > access to 4 meters (like European hams) once analog television goes dark?
> 
> There's only a limited set of European hams who have access to 4 meters. 
> Analogue television went dark here (the Netherlands) 7 months ago, 
> and the request was made, but the regulator turned it down: 
> the frequency was shared with green hats, and the're not letting go.
> 
> Would be nice, though.
> 
> 73, 
> 
> Geert Jan PE1HZG
> 

Re: [Repeater-Builder] 4 meters

[Geert Jan de Groot]

On 29 Jul 2007 10:39:32 -  Repeater-Builder@yahoogroups.com wrote:
> I was just wondering if anyone had heard any actions to get amateurs 
> access to 4 meters (like European hams) once analog television goes dark?

There's only a limited set of European hams who have access to 4 meters. 
Analogue television went dark here (the Netherlands) 7 months ago, 
and the request was made, but the regulator turned it down: 
the frequency was shared with green hats, and the're not letting go.

Would be nice, though.

73, 

Geert Jan PE1HZG

Re: [Repeater-Builder] Re: 4 meters

[Com/Rad Inc]

Hello Group

Remember UPS's brainchild circa 1988-90 - petitioning the FCC for 220 spectrum 
for nationwide data - - 

After UPS spent megabucks  to develop the idea -  

After the Amateur Radio lobby - ARRL etc went balistic

Uncle decided to Auction off the spectrum 

Today it is mostly unused with the majority of attempts to populate - utilize 
losing out to 
competitive services and advancing technology.

After over 40 yrs in the Comms business and Ham Radio ( almost 50 yrs ) I kinda 
like the way it used to be 

It is fun ( I wont go into it now ) to listen to ex-FCC attorneys talk about 
some of these "programs" or NPRMs

Good weekend to all

Ed Folta
Com/Rad Inc.
Des Plaines IL



  - Original Message - 
  From: skipp025 
  To: Repeater-Builder@yahoogroups.com 
  Sent: Sunday, July 29, 2007 6:09 AM
  Subject: [Repeater-Builder] Re: 4 meters


  Analog stations are setup to go dark at some already fixed date. 
  But I've got serious money to bet it's not going to happen... at 
  least at that specified date/time. ... if ever. 

  And here's the train wreck... 

  Those frequencies have reportedly already been auctioned off and 
  the new owners are chomping at the bit to put their services on 
  the air. 

  IBOC HD Radio and the end of analog tv ain't gonna happen 
  anytime soon if ever... 

  cheers, 
  s. 

  > "JOHN MACKEY" <[EMAIL PROTECTED]> wrote:
  > I was just wondering if anyone had heard any actions to get 
  > amateurs access to 4 meters (like European hams) once analog 
  > television goes dark?
  >



   

[Repeater-Builder] Re: 4 meters

[skipp025]

Analog stations are setup to go dark at some already fixed date. 
But I've got serious money to bet it's not going to happen... at 
least at that specified date/time.   ... if ever. 

And here's the train wreck... 

Those frequencies have reportedly already been auctioned off and 
the new owners are chomping at the bit to put their services on 
the air. 

IBOC HD Radio and the end of analog tv ain't gonna happen 
anytime soon if ever... 

cheers, 
s. 

> "JOHN MACKEY" <[EMAIL PROTECTED]> wrote:
> I was just wondering if anyone had heard any actions to get 
> amateurs access to 4 meters (like European hams) once analog 
> television goes dark?
>