[CW] High Power Coax

[STEVE JOHNSTON]

As of my last visit, WLW still operates their giant rigid transmission line from the superpower days.

73 

Steve  WD8DAS 



Sent from my iPhone

> On Apr 13, 2024, at 1:14 PM, Richard Knoppow <1oldlens1 at ix.netcom.com> wrote:
> 
>    In "Radio Antenna Engineering" by Edmund A. LaPort he shows a 12" coaxial line at a transmitting site for WJZ built for 500KW broadcast service. Nitrogen filled. The super power was never approved and WJZ (now WABC) moved to another site after a time. Of course, 500KW carrier means 2 megawatt peak for AM.
> 
>> On 4/13/2024 2:17 PM, sbjohnston--- via CW wrote:
>> Biggest I've used in my radio stations has been 3-1/8" rigid coaxial line.  Dielectric is dry air or nitrogen.  Mounting and hangers have to allow for the considerable expansion hot days versus cold nights for hundreds of feet of this line.
>> Some VHF TV stations I've worked with had the 6-1/8" size.
>> Steve WD8DAS
>> sbjohnston at aol.com
>> http://www.wd8das.net/ <http://www.wd8das.net/> <http://www.wd8das.net/>
>> http://af4k-crystals.com <http://af4k-crystals.com>/
>> --------------------------------------------------------------------
>> Radio is your best entertainment value.
>> --------------------------------------------------------------------
>> On Friday, April 12, 2024 at 03:34:56 PM HST, D.J.J. Ring, Jr. <n1ea at arrl.net> wrote:
>> 50 Ohm coax sections. The inner conductor is 6-1/8 inch hardline outer conductor. Big stuff. It easily handles 4 Megawatts peak power or about 360 kW continuously.
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> 
> -- 
> Richard Knoppow
> Los Angeles
> WB6KBL
> SKCC 19998
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