kjlpdx
Joined: 18 Dec 2018
Posts: 4
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 Posted: Mon Jan 07, 2019 10:19 pm Post subject: gps cables for stratus ESG |
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I spoke with appareo tech support and received this reply. I haven't yet looked into finding BNC connectors to make up a new cable.
Kevin,
I asked our design engineers for some input and here is what I got in response from them:
looking at pasternack, RG400 has a cable loss of about 14.7dB per 100ft at 1GHz. so if I pretend the loss is about 15dB per 100ft at 1575MHz. that is about 1.5dB. Is that what we spec for a minimum loss?
if so if you are to used RG178 which pasternack states it has a cable loss of about 44.41dB per 100 ft at 1GHz. So 3ft 4 in of cable will be more than 1.48dB of loss.
I would stay away from connectors, they are extra points of failure and reflections.
Kevin,
I would bump the length of RG178 up just a little. Then manuals says 2 db loss as a minimum and they figured it for 1.5 db loss which is probably still OK.
Greg
--------------- Original Message ---------------
From: Kevin Lane [kevinlane55(at)gmail.com]
Sent: 1/6/2019 11:48 PM
To: support(at)appareo.com
Subject: Stratus Products that I own
From: Kevin Lane
Subject: Stratus Products that I own
Name: Kevin Lane
Email: Phone:
Message Body:
I installed my ESG with 3' of RG400 gps antenna cable. I know you said 10' minimum, but I don't want all that cable behind the panel. is there another solution? I am getting 42db on several satellites. frankly I wonder if this is really a problem with my VFR only airplane. would the prior RG58 cable work better? would additional mechanical connectors reduce the signal a bit? I also spray painted the antenna black with no change in sensitivity. I fly an RV. [experimental class]
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