Re: Topband: Coax for Top-band beverage antenna

[Artek Manuals]

Kevin et all
(follow up to a post earlier this week)

I am in the process of building some RG6 BOG's ( where the "antenna" and 
the feed line are both RG6)  and happen have a brand new 500' role of 
Southwire RG6 type CM/CL . 18ga copper clad steel center conductor 100% 
Aluminum foil/60% aluminum braid


I measured the loss with a 75ohm load and 33ohm load (~2:1vswr) with the 
following results


75 ohm load 4.5db (.9db/100 feet)
33 ohm load 8db loss (1.6db/100 feet)

This is about as cheap as it gets at $40/500ft or $.08/foot. This was 
purchased at my local big box builder supply


Equipment used : HP E4433B generator and Boonton 92A RF Voltmeter

Dave
NR1DX


PS: so far the Bogs are working quite well but still tweaking, full 
report when I am done
PPS: if you want loss numbers for other frequencies (80 & 40) drop me a 
private email


On 9/19/2019 3:15 PM, Kevin Shea wrote:

Dave,

The run to the feedpoint of the beverage is about 600'  The beverage 
antenna itself will be coax and that will be about 800'.


Kevin, N9JKP


On Thursday 19 September 2019, 10:25:04 CDT, Artek Manuals 
 wrote:



Kevin

How long a run we talking here?

Dave
NR1DX

On 9/19/2019 11:17 AM, Kevin Shea via Topband wrote:
> I have read that the skin effect at 2 MHz may be deeper than the 
copper coating on a copper covered steel inner conductor of most RG6 
cables.  Thus, as I plan for long cable runs back from my (to be 
installed) Beverages I am thinking I need either solid copper, solid 
aluminum,. or copper covered aluminum for my RG6 coax. So the question 
is am I wrong in this understanding?
> Also, does the shield matter?  It's not very thick so does a foil 
and 60% aluminum shield do the job?  Or should I be looking at a foil 
and 95 percent copper shield like the Belden 1694.
> I know it may not be too material but I want to make an informed 
decision.

> Thanks! and
> 73,
> Kevin, N9JKP

> _
> Searchable Archives: http://www.contesting.com/_topband 
- Topband Reflector


--
Dave
manu...@artekmanuals.com 
www.ArtekManuals.com


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Dave
manu...@artekmanuals.com
www.ArtekManuals.com

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Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

Re: Topband: Coax for Top-band beverage antenna

[FZ Bruce]

Different location, different problems. Use the good stuff, to avoid
being surprised.
73Bruce-K1FZ

-From: "Jeremy Maris" 
To: topband@contesting.com
Cc: 
Sent: Thursday September 19 2019 1:40:33PM
Subject: Re: Topband: Coax for Top-band beverage antenna

That depends upon the length of the feedline: cheap copper plated
satellite RG6 has a *lot* of attenuation at 2MHz, as much as 3.6dB per
100m

 We have a 750m coax feed to our beverages and attenuation DOES matter
on long feed lines. We had ~ 25dB !

 http://www.contesting.com/_topband [1] - Topband Reflector
 > 
 > _
 > Searchable Archives: http://www.contesting.com/_topband [2] -
Topband Reflector

 _
 Searchable Archives: http://www.contesting.com/_topband [3] - Topband
Reflector
 

Links:
--
[1]
http://lists.contesting.com/archives//html/Topband/2011-05/msg00027.html
http://lists.contesting.com/archives//html/Topband/2011-05/msg00027.html
 /> 
 Caveat emptor.
 
 Jeremy G3XDK/G4AQG
 
 
 > On 19 Sep 2019, at 17:57, K4SAV  wrote:
 > 
 > Don't worry about feedline loss for a Beverage. A few dB loss isn't
going to make any difference at all. You can worry about feedline loss
for transmit antennas, not for receiving antennas.
 > 
 > Jerry, K4SAV
 > 
 > 
 > On 9/19/2019 10:17 AM, Kevin Shea via Topband wrote:
 >> I have read that the skin effect at 2 MHz may be deeper than the
copper coating on a copper covered steel inner conductor of most RG6
cables. Thus, as I plan for long cable runs back from my (to be
installed) Beverages I am thinking I need either solid copper, solid
aluminum,. or copper covered aluminum for my RG6 coax. So the question
is am I wrong in this understanding?
 >> Also, does the shield matter? It's not very thick so does a foil
and 60% aluminum shield do the job? Or should I be looking at a foil
and 95 percent copper shield like the Belden 1694.
 >> I know it may not be too material but I want to make an informed
decision.
 >> Thanks! and
 >> 73,
 >> Kevin, N9JKP
 >> _
 >> Searchable Archives: http://www.contesting.com/_topband
[3] http://www.contesting.com/_topband

_
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

Re: Topband: Coax for Top-band beverage antenna

[Jeremy Maris]

That depends upon the length of the feedline: cheap copper plated satellite RG6 
has a *lot* of attenuation at 2MHz, as much as 3.6dB per 100m

We have a 750m coax feed to our beverages and attenuation DOES matter on long 
feed lines. We had ~ 25dB !

http://lists.contesting.com/archives//html/Topband/2011-05/msg00027.html

Caveat emptor.

Jeremy G3XDK/G4AQG


> On 19 Sep 2019, at 17:57, K4SAV  wrote:
> 
> Don't worry about feedline loss for a Beverage.  A few dB loss isn't going to 
> make any difference at all.  You can worry about feedline loss for transmit 
> antennas, not for receiving antennas.
> 
> Jerry, K4SAV
> 
> 
> On 9/19/2019 10:17 AM, Kevin Shea via Topband wrote:
>> I have read that the skin effect at 2 MHz may be deeper than the copper 
>> coating on a copper covered steel inner conductor of most RG6 cables.  Thus, 
>> as I plan for long cable runs back from my (to be installed) Beverages I am 
>> thinking I need either solid copper, solid aluminum,. or copper covered 
>> aluminum for my RG6 coax.  So the question is am I wrong in this 
>> understanding?
>> Also, does the shield matter?  It's not very thick so does a foil and 60% 
>> aluminum shield do the job?  Or should I be looking at a foil and 95 percent 
>> copper shield like the Belden 1694.
>> I know it may not be too material but I want to make an informed decision.
>> Thanks! and
>> 73,
>> Kevin, N9JKP
>> _
>> Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
> 
> _
> Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

_
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

Re: Topband: Coax for Top-band beverage antenna

[K4SAV]

Don't worry about feedline loss for a Beverage.  A few dB loss isn't 
going to make any difference at all.  You can worry about feedline loss 
for transmit antennas, not for receiving antennas.


Jerry, K4SAV


On 9/19/2019 10:17 AM, Kevin Shea via Topband wrote:

I have read that the skin effect at 2 MHz may be deeper than the copper coating 
on a copper covered steel inner conductor of most RG6 cables.  Thus, as I plan 
for long cable runs back from my (to be installed) Beverages I am thinking I 
need either solid copper, solid aluminum,. or copper covered aluminum for my 
RG6 coax.  So the question is am I wrong in this understanding?
Also, does the shield matter?  It's not very thick so does a foil and 60% 
aluminum shield do the job?  Or should I be looking at a foil and 95 percent 
copper shield like the Belden 1694.
I know it may not be too material but I want to make an informed decision.
Thanks! and
73,
Kevin, N9JKP
_
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector


_
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

Re: Topband: Coax for Top-band beverage antenna

[Artek Manuals]

Kevin

How long a run we talking here?

Dave
NR1DX

On 9/19/2019 11:17 AM, Kevin Shea via Topband wrote:

I have read that the skin effect at 2 MHz may be deeper than the copper coating 
on a copper covered steel inner conductor of most RG6 cables.� Thus, as I plan 
for long cable runs back from my (to be installed) Beverages I am thinking I 
need either solid copper, solid aluminum,. or copper covered aluminum for my 
RG6 coax.� So the question is am I wrong in this understanding?
Also, does the shield matter?� It's not very thick so does a foil and 60% 
aluminum shield do the job?� Or should I be looking at a foil and 95 percent 
copper shield like the Belden 1694.
I know it may not be too material but I want to make an informed decision.
Thanks! and
73,
Kevin, N9JKP
_
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector


--
Dave
manu...@artekmanuals.com
www.ArtekManuals.com


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Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

Topband: Coax for Top-band beverage antenna

[Kevin Shea via Topband]

I have read that the skin effect at 2 MHz may be deeper than the copper coating 
on a copper covered steel inner conductor of most RG6 cables.  Thus, as I plan 
for long cable runs back from my (to be installed) Beverages I am thinking I 
need either solid copper, solid aluminum,. or copper covered aluminum for my 
RG6 coax.  So the question is am I wrong in this understanding?  
Also, does the shield matter?  It's not very thick so does a foil and 60% 
aluminum shield do the job?  Or should I be looking at a foil and 95 percent 
copper shield like the Belden 1694.
I know it may not be too material but I want to make an informed decision.  
Thanks! and
73,
Kevin, N9JKP
_
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector