[TowerTalk] Cable Loss Comparison (Was 9913 reliability)

[N2TK]

Hi Press. You are right. Once Tom converted the numbers to db, the 213
results didn't look right. When I had done the tests I was only interested
if everything seemed to be in the ballpark and working okay.
Just went out to the tower. What I thought was 213 is RG8 foam. Now it makes
more sense. I had bought a spool of LMD-400 in case the coax, other than the
hardline had a problem, but would up leaving it on the spool, for now.
73,
Tony

-----Original Message-----
From: owner-towertalk@contesting.com
[mailto:owner-towertalk@contesting.com]On Behalf Of n4kg@juno.com
Sent: Thursday, December 20, 2001 15:19
To: TOWERTALK@contesting.com
Subject: Fw:[TowerTalk] Cable Loss Comparison (Was 9913 reliability)


--------- Forwarded message ----------
From: n8ug@juno.com
To: n4kg@juno.com
Date: Thu, 20 Dec 2001
Subject: Re: [TowerTalk]  Cable Loss Comparison (Was 9913 reliability)

Hi Tom

The data are right in the ballpark for all but the 213 - no real 213
is gonna show better than 1.3db/100ft - so "very interesting indeed!"

Press  N8UG

(I have the MIME problem on my LT and can't post on TT
unless I figure out how to change it - no time to fiddle!)

On Thu, 20 Dec 2001 12:26:47 -0600 n4kg@juno.com writes:
>
> Thanks for posting your measurements Tony.
>
> I converted your percentages to dB total and dB/100 ft
> as shown in the following table.    For your 220 ft runs,
> it looks like there is little benefit to using 9913 over
> RG213 and little benefit in using 7/8 inch hardline over
> 1/2 inch hardline.  The 1/2 inch hardline offers 1 dB
> less loss than 220 ft RG213. Very interesting result.
>
> Tom  N4KG
>
> Cable (avg 220 ft)        dB loss    dB/100 ft at 10M
>
> 7/8"  hardline - 88%         0.555         0.25
> 1/2"  hardline - 82%         0.86           0.39
> 9913 - 68%                     1.675         0.76
> RG-213 - 65%.                1.87           0.85
>
>
> On Thu, 20 Dec 2001  "N2TK" <t.kazmakites@verizon.net> writes:
>
> Just had tilted over the tower to replace some antennas. Checked
> the coax for loss. Measured the power going into the coax and
> measured  the  power at the end of the coax at 28.0 MHz with
> a dummy load on the coax.  Used  the same watt meter for both.
> The length of the coaxes is about 210 - 230'.
>
>  Here is the loss as a percentage of power out/power in.
>  By the way, I cut off the end of one of the 9913 runs at the house
> (lowest point of run) to see if any discoloration of the copper.
> There was none. This coax has been up for 8 years.

> > 7/8" Prodelin hardline - 88%
> > 1/2" Prodelin hardline - 82% - 2 runs measured the same
> > 9913 - 68% - 2 runs measured the same
> > RG-213 - 65%.
> >
> > The measurements are approximate and were done to just check to
> make sure the coax didn't have a problem.
> >
> > Tony  (N2TK)

________________________________________________________________
GET INTERNET ACCESS FROM JUNO!
Juno offers FREE or PREMIUM Internet access for less!
Join Juno today!  For your FREE software, visit:
http://dl.www.juno.com/get/web/.

AN Wireless Self Supporting Towers are now available!  Windloading tables,
foundation diagrams and charts, along with full details are now at the
AN Wireless Web site:  http://www.ANWireless.com

-----
FAQ on WWW:               http://www.contesting.com/FAQ/towertalk
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
Problems:                 owner-towertalk@contesting.com



AN Wireless Self Supporting Towers are now available!  Windloading tables,
foundation diagrams and charts, along with full details are now at the
AN Wireless Web site:  http://www.ANWireless.com

-----
FAQ on WWW:               http://www.contesting.com/FAQ/towertalk
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
Problems:                 owner-towertalk@contesting.com