Hmmmm, since all RG-6 uses a foam dielectric your comment is rather
confusing. The premade Chinese cables available at box stores and raw
unbranded cable should be suspect of course. I use Com Scope and Times as
they are readily available from CATV crews in useable lengths.
Also consider that there is a substantial margin to the published breakdown
voltage and youre good to go at a substantial power level. Ive known hams
that use RG-58 to feed HV to amps at over 2500V!
Many years ago I used RG-6 as the coax part of a G5RV at 600W and never had
a breakdown even at the rather high VSWR.
The power levels Ive mentioned are for CW and SSB, derate for AM.
Carl
KM1H
----- Original Message -----
From: "Jim Wilhite" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
<[email protected]>
Sent: Sunday, January 06, 2008 2:03 PM
Subject: Re: [AMRadio] RG-6 Coax
From the Belden site:
RG-6/U Type 1532A 6.20 Belden 1/.040? CCS GIFPE DBII/90% AL PE .024 75
16.2 -55 to +80 300
The last number in that list is the voltage rating of Belden RG 6 U for
burial type. So if you run a KW that means your voltage is near 265
volts. This is fine provided you have a good match.
What I am saying is that not all RG 6 is as good quality so one must be
careful. I have seen some RG 6 that I wouldn't put more than 25 watts
into because of the construction. This is particularly true of foam
filled. It melts at a lower temperature than PE. Usually the drop cable
used by CATV people is much better.
Jim/W5JO
----- Original Message -----
From: "EP Swynar" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
<[email protected]>
Sent: Sunday, January 06, 2008 11:08 AM
Subject: Re: [AMRadio] RG-6 Coax
Hi Guys,
I use RG-6 cable here EXCLUSIVELY with my 160-meter 3-element phased
triangular inverted "L" arrray --- the 135-degree phasing harnesses, the
individual feeders, THE WORKS!
...AND I run a kilowatt input here, too.
No problems thus far, and I honestly believe that at this low a
frequency, I
haven't even come close to what this cable is truly capable of handling.
~73!~ Eddy VE3CUI - VE3XZ
***************************************
----- Original Message -----
From: "Donald Sanders" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
<[email protected]>
Sent: Sunday, January 06, 2008 11:08 AM
Subject: Re: [AMRadio] RG-6 Coax
I use a 50 foot length from my 40 meter loop to the 50
ohm coax and transmit 100 to 150 watts with out a problem.
Healthfully yours,
Don W4BWS
----- Original Message -----
From: "Jim Wilhite" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
<[email protected]>
Sent: Saturday, January 05, 2008 8:16 PM
Subject: Re: [AMRadio] RG-6 Coax
> You are correct but I wouldn't consider using it for transmitting on
> any
> radio with power more than about 25 watts.
>
> The original RG 6 was made well but today finding a consistent quality
> cable is almost impossible unless you buy the best US specified brand,
> which is almost as expensive as LMR type cable.
>
> Even then, you are taking a chance if you try to put much over 25
> watts
> into it.
>
> Jim/W5JO
>
>
>
> >I believe it's in the neighborhoon of 72 ohms. Typical video cable.
>
> >> Does anyone know off hand the impedance of RG-6? I was given a
> >> hundred feet
> >> or so I'd like to use with my UHF antennas, but the cable guy
> >> didn't
> >> know
> >> the impedance. Google showed some specs, but I gave up before I
> >> got
> >> the
> >> impedance.
> >>
> >> Thanks,
> >> Rick/K5IAR
>
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