[Moon] Cabling a dish

[Steve Gross]

John it takes a whole lot of junk in the way to have any effect on your
dish. You could lose 20% of the reflective surface and never notice it.
I run a bundle of cables the size of your forearm down one strut & it makes
no difference.
I've had whole panels on a tower mounted 6 foot dish blow away & I noticed
it only by looking at it. Figure out how many square feet your dish is and
compare it to some tiny blockage. Nothing. My dish is over 200 square feet.
It takes a hell of a lot of junk in the way to have any effect.
73
Steve N4PZ

-----Original Message-----
From: Moon [mailto:moon-bounces at moonbounce.info] On Behalf Of g4bao
Sent: Friday, December 25, 2015 2:38 PM
To: Sam Jewell
Cc: moon
Subject: Re: [Moon] Cabling a dish

I've got a small hole in my dish and bring the feed back down the axis of
the dish. It is self-supporting and I assumed the blockage would be minimal
as it's the diameter of the coax bundle. Certainly saw no improvement or
degradation on the original way where I took the feed down a tripod leg

John

On 25 December 2015 at 20:00, Sam Jewell <jewell at btinternet.com> wrote:

> Hi everyone,
> Please excuse this question, but as I sit here, digesting my Christmas 
> dinner, I started to wonder about the effects of coaxial cables in 
> front of a dish.
> Many of us run dish feeds with the power amplifier behind the dish 
> rather than at the feedpoint (23cm and 13cm typical). I suspect most 
> of us then run the transmit feeder ( and receive feeder) down one of 
> the support tripods to the rim of the dish and then either back to the 
> centre of the dish rear or maybe away at an angle to wherever the PA
connection is.
> Clearly the route back to the rear centre of the dish is more than two 
> times the dish radius and even in the case of my 2.3m dish is a fairly 
> long run of what might not be the very lowest loss coax size because 
> of weight constraints.
> My question is:
> Is it better to bring the transmit feeder back from the feed to the 
> centre
> (hub) of the dish or to keep it off to one side where the effects of 
> blockage and illumination level are lower, but longer coax than to the 
> centre?
> I'd be interested to know what others do before I cut any 
> (inadvisable) holes in my 2.3m dish mesh?
>
> Ohh, and Merry Christmas, if it isn't too late!
>
> 73 de Sam, G4DDK
>
>
> Sent from my DDKpad
>
> g4ddk.com
> g4ddk.blogspot.com
>
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