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dougshep
Joined: 22 Jul 2010
Posts: 7
Location: Santa Barbara, CA
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 Posted: Fri Apr 01, 2011 10:27 am Post subject: Coax Cable |
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I'm installing a Garmin GTX-327 Transponder and will need a coax cable with a 15 foot run to its antenna. According to the GTX-327 install. manual, a double shielded 50 ohm coax cable with less than 1.5db loss at 1090MHz should be used. They suggest either RG304 or RG393 and a vendor: www.ecsdirect.com
Wonder if anyone knows of other sources for this cable requirement?
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Doug Shepard, RV-9A |
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stein(at)steinair.com
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| Posted: Fri Apr 01, 2011 11:11 am Post subject: Coax Cable |
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Put it RG400 and call it good! That's my 2 cents and what we use extensively
(as do most).
Cheers,
Stein
--
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nuckolls.bob(at)aeroelect
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| Posted: Fri Apr 01, 2011 5:01 pm Post subject: Coax Cable |
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At 03:10 PM 4/1/2011, you wrote:
| Quote: |
Put it RG400 and call it good! That's my 2 cents and what we use extensively
(as do most).
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Agreed. The run-o-the-mill GA pilot would be
hard pressed to detect any difference in
transponder performance for the increased
loss.
However, for the purists and the curious,
I'll point out this Internet resource:
http://www.timesmicrowave.com/cgi-bin/calculate.pl
Using this calculator you can wade through
all the possibilities. For example, RG-400
at 1090 would have to be limited to 10 feet
to meet the 1.5 db target . . . actually a
tad less because connectors add a bit more.
Taking RG-400 out to 15 ft adds less than
1 db additional loss.
A popular low loss cable for microwave
is LMR400 which is available by the foot
here
http://www.tessco.com/products/displayProductInfo.do?sku=59520
The calculator shows phenomenal performance
at only 0.6 db loss for the 15 ft run. I used
this stuff to get real-time GPS signals down
from the roof of our building to the electronics
lab . . . about a 50 run with excellent
performance.
But then you have the problem of mating connectors
to this cable. You might find someone on the
'net that can sell you pre-cut cables with
connectors already installed.
All things considered, the RG400 terminated
with tools and connectors readily available
to the OBAM aircraft builder is a really good
value and unlikely to present any performance
issues.
Bob . . .
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Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
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| Posted: Sat Apr 02, 2011 4:41 am Post subject: Re: Coax Cable |
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Try this-- RG+142 Its main attributes are are that it weighs 1/3 of standard RG142 (incredible) and has markedly better temperature performance, better shielding and lower loss. I sell a lot of it, some to Indy car builders.
The main trick is that it uses Copper-Clad Aluminum for it's core, not copper or steel. So it's made for military aircraft and satellite use.
Sample on request.
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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net |
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