[amsat-bb] Re: Coaxial line question

[Luc Leblanc]

On 24 Jan 2010 at 11:26, Anthony Monteiro wrote:

Date sent:      	Sun, 24 Jan 2010 11:26:02 -0500
From:           	Anthony Monteiro <aa2tx at comcast.net>
Subject:        	Re: [amsat-bb]  Coaxial line question
To:             	Luc Leblanc <lucleblanc6 at videotron.ca>, amsat-bb at amsat.org
Copies to:      	eu-amsat at yahoogroups.com

> Hi Luc,
> 
> I am assuming you meant 7/8" Heliax.
> 
> 45' of Heliax and a short LMR400 jumper will have around
> 0.6 dB of loss on 70cm so that just adds 0.6 dB to
> the noise figure of your preamp (i.e. ~1.0 dB to ~1.6 db.)
> With even a modest gain antenna, you probably will not be
> able to notice any difference on a satellite downlink.
> 
> On 2 meters, even less difference.
> 
> 73,
> Tony AA2TX
> 
> ---
> 
Yes 7/8... and i received the same comment on AMSAT-EU forum and placing the preamps closer to the shack will better protect them from the 
WX issues ice/snow storm and winds plus they will put them away from the RF transmit field who i suspect some desense happen time to time 
causing also a lot of intermod as i'm at less than 1km from a cellular/pagers/police/fire tower. i can see the tower light beacon from my 
house window. 

Thank's

"-"


Luc Leblanc VE2DWE
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