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Re: [TowerTalk] Coax Losses on 160 and 75?

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Coax Losses on 160 and 75?
From: Kevin <kstover@ac0h.net>
Date: Sun, 7 Aug 2016 14:24:23 -0500
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Whoopsy, 0.405 diameter instead of 4.05.


On 8/7/2016 2:21 PM, Kevin wrote:
So were all talking about the same stuff.

Manufacturer's Part Number: /DXE-213U-1000/
Coaxial Cable Type: RG-213/U
Coaxial Cable Jacket Outside Diameter: 0.405 in.
Coaxial Cable Jacket Material: PVC, Non-contaminating, Type II-A
Center Conductor Gauge: 12.5 AWG
Center Conductor Material: Bare copper
Center Conductor Construction: 7 strand - 0.0296 in.
Dielectric Material: Solid polyethylene
Dielectric Outside Diameter: 0.285 in.
Shield 1 Construction: Braided
Shield 1 Material: Bare copper
Shield 1 Percent Coverage: 96-97
Loss Per 100 ft. at 30 MHz: 1.0 dB
Velocity Factor Percentage: 66
Coaxial Cable Length: 1,000 ft.
Assembled: No
UV-Resistant: Yes
Direct Bury: Yes


DXE Part Number: *DXE-11U*
Coaxial Cable Type: RG-11/U
Coaxial Cable Jacket Outside Diameter: 0.405 in.
Coaxial Cable Jacket Material: PE, Type III
Center Conductor Gauge: 14 AWG
Center Conductor Material: Bare copper
Center Conductor Construction: Solid
Dielectric Material: Gas injected foam polyethylene
Dielectric Outside Diameter: 0.280 in.
Shield 1 Construction: Braided
Shield 1 Material: Bare copper
Shield 1 Percent Coverage: 97
Loss Per 100 ft. at 30 MHz: 0.7 dB
Velocity Factor Percentage: 84
Assembled: No
UV-Resistant: Yes
Direct Bury: Yes


//*C*oaxial Cable Type: RG-6/U
Cable Connector End 1: Type F, male
Cable Connector End 2: Type F, male
Coaxial Cable Jacket Outside Diameter: 0.300 in.
Coaxial Cable Jacket Material: PVC, Non-contaminating, Type II-A
Center Conductor Gauge: 18 AWG
Center Conductor Material: Copper-clad steel
Center Conductor Construction: Solid
Dielectric Material: Gas injected foam polyethylene
Dielectric Outside Diameter: 0.178 in.
Shield 1 Construction: Aluminum bonded polyester tape plus aluminum braid
Shield 1 Material: Aluminum foil/aluminum braid
Shield 1 Percent Coverage: 100
Shield 2 Construction: Aluminum bonded mylar tape plus aluminum braid
Shield 2 Material: Aluminum foil/aluminum braid
Shield 2 Percent Coverage: 100
Loss Per 100 ft. at 30 MHz: 1.1 dB
Velocity Factor Percentage: 83
UV-Resistant: Yes
Direct Bury: Yes

This what gets installed by Mediacom cable and the only one of the four with a foil second shield. Comscope sells a gazillion miles of this stiff. Because of the smaller diameter, .300 inches compared to 4.05 I don't see how this could be mistaken for RG11U.

DXE Part Number: *DXE-8U-1000*
Coaxial Cable Type: RG-8/U
Coaxial Cable Jacket Outside Diameter: 0.405 in.
Coaxial Cable Jacket Material: PVC, Type I
Center Conductor Gauge: 11 AWG
Center Conductor Material: Bare copper
Center Conductor Construction: 7 strands of 21 AWG
Dielectric Material: Gas injected foam polyethylene
Dielectric Outside Diameter: 0.285 in.
Shield 1 Construction: Braided
Shield 1 Material: Bare copper
Shield 1 Percent Coverage: 95-97
Loss Per 100 ft. at 30 MHz: 0.9 dB
Velocity Factor Percentage: 81
Coaxial Cable Length: 1,000 ft.
Assembled: No
UV-Resistant: Yes
Direct Bury: No

I have never used RG8U. I prefer RG213.


On 8/7/2016 12:13 PM, Jim Brown wrote:
On Sun,8/7/2016 1:04 AM, Jeff AC0C wrote:
I really really do appreciate all of the email attempting to rectify my misunderstanding of proper coax line terminology. However that is a debate of miniature that I'm sure the original poster is not asking about. The fact is if you lined up 10 hams and showed them a roll marked RG11 at a hamfest, I would guess at least 9 of them would expect it to the be foil + lousy braid stuff of the CATV era.

Perhaps I lead a sheltered life. I've never seen CATV RG11 in the flesh, only in catalogs. And I've been no stranger to flea markets for most of my adult life. I've seen lots of CATV stuff labeled RG6, I've used a lot of it feeding RX antennas. 40 years ago, I even got paid to install some of it in locations as diverse as Chicago town homes and Sears Tower. :)

The fellow was asking about what he could use that was cheap. Commonly referred to "RG11" - meaning the cheap stuff from the CATV type (whatever the proper nomenclature is for that) - works fine in ham applications. That is the point of my comment.

Yep -- for a while, and as long as it doesn't get wet. And it has more loss than RG11 made from copper.

73, Jim K9YC

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--
R. Kevin Stover
AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441


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