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rjquillin
Joined: 13 May 2007
Posts: 123
Location: KSEE
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 Posted: Sat May 26, 2007 7:32 pm Post subject: Garmin 327 XPDR Cable & Artex me406 ELT cable |
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At 18:13 5/26/2007, you wrote:
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| Quote: | In January Bob wrote:
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| Quote: | "Coax cable length should
be minimized for the lengths commonly
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| Quote: | used in light aircraft,
both type of cable and variability in length
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| Quote: | will have no observable
effect on performance.", but the Garmin
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| Quote: | GTX 327 Installation
Manual has a list of recommended Antenna Cable
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| Quote: | Types by length on page
9. They sure imply that it is critical.
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| Quote: | For the 12.5 foot length
I need, Garmin recommends either RG304 or
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| Quote: | M17/112. Let me
just say the RG304 seems to be scarce.
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These folks used to carry a good line of coax and stormscope antenna and control cables,
but their web site looks to be undergoing some major changes.
http://www.ecsdirect.com/
| Quote: | | Quote: |
They do say that any 50 ohm, double
shielded cable may be used,
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| Quote: | In January Bob wrote:
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| Quote: | In January Bob wrote:
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| Quote: | In January Bob wrote:
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I used 400 with the GTX-33
| Quote: | | Quote: | In January Bob wrote:
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| Quote: | In January Bob wrote:
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| Quote: | In January Bob wrote:
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| Quote: | In January Bob wrote:
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| Quote: | In January Bob wrote:
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I have some M27500-24ML8TC8
MIL rated open airframe wiring; 8 - 24AWG connectors, shielded, overall jacket 0.157 dia. 0.41 oz/ft.
Mfg by
BICC Brand Rex
P.O. Box 498
1600 W. Main St.
Willimantic, CT 06226
CAGE Code: 71124
Not sure what the policy here is regarding selling stuff, so if you're interested, contact me directly.
Ron Q. [quote][b]
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nuckollsr(at)cox.net
Guest
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| Posted: Sat May 26, 2007 10:09 pm Post subject: Garmin 327 XPDR Cable & Artex me406 ELT cable |
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To: <aeroelectric-list(at)matronics.com>
Subject: Garmin 327 XPDR Cable & Artex me406 ELT cable
All,
In January Bob wrote: "Coax cable length should be minimized for
the lengths commonly used in light aircraft, both type of cable and
variability in length will have no observable effect on performance.", but
the Garmin GTX 327 Installation Manual has a list of recommended Antenna
Cable Types by length on page 9. They sure imply that it is critical. For
the 12.5 foot length I need, Garmin recommends either RG304 or
M17/112. Let me just say the RG304 seems to be scarce. They do say that
any 50 ohm, double shielded cable may be used, provided it introduces less
that 1.5 dB attenuation at 1 ghz including the connector. It is worth
asking what that means and how to measure it? What is being used
successfully in the real world? RG400? Jim Wier seems to still prefer RG58!
Hmmm . . . maybe he's trying to use up a 20,000ft
spool. I dumped all my RG-58 at a hamfest about
20 years ago.
Get some LMR-400 cable and the connectors appropriate
to your antenna and radio. You can probably find a
cable house that will put the connectors on a custom
length of LMR-400 which is still relatively small
and easy to handle. Alternatively, you can go to
something like RG-214 which according to the calculator
at:
http://www.timesmicrowave.com/cgi-bin/calculate.pl
Will meet Garmin's suggestions for 1.0 db of 1GHz
loss for the 12.5 foot distance you've cited.
The Artex installation instructions call for 5 conductor shielded cable
either 22 AWG or 24 AWG. Since no vendor seems to carry this cable, others
must be using some thing else. I did find 4 conductor shielded cable on
B&C. Anyone have a source or recommendation?
Not in aircraft wire. And in PVC, you'd probably
have to buy a 100' spool to meet most catalog minimum
buys. I'm skeptical of the need to shield these wires.
but you could use two runs of shielded trio from
B&C in aircraft wire.
If I had schematics for the hardware at both ends,
we might be able to recommend a shielded quad with
shield being used as one of the 5 conductors (ground).
Steinair has shielded quads.
Bob . . .
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Bill McMullen
Joined: 23 Nov 2006
Posts: 7
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| Posted: Sun May 27, 2007 7:51 am Post subject: Re: Garmin 327 XPDR Cable & Artex me406 ELT cable |
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The Artex ME406 manual that I have is very clear that shielded 5 wire cable is only recommended. They further state that shielded 4 conductor cable can be used where the shield is used as the ground wire. This latter method can also be used for upgrade compatibility. I wired my remote for an Artex ELT-200 using 4 conductor shielded wire in such a way that it can later be used for an ME-406 replacement simply by changing the ELT plug.
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nuckollsr(at)cox.net
Guest
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| Posted: Mon May 28, 2007 7:36 am Post subject: Garmin 327 XPDR Cable & Artex me406 ELT cable |
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At 07:13 PM 5/27/2007 -0400, you wrote:
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<jeffrey_davidson(at)earthlink.net>
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That should work. I guess I don't know about the 'enjoy' part.
All our living room, dining room and kitchen furnishings are
stuffed into other rooms and we're painting walls and putting
down hardwood flooring and new baseboards. Woke up this morning
with the same aches I had when I went to bed last night! But
the light at the end of the tunnel is not an oncoming train. Parts
of the project are finishing and it sure looks nice. Yeah, I'll
enjoy the holiday . . . but a couple of days from now!
Bob . . .
| Quote: | Bob,
Working with the calculator and talking to an electrical engineer
here I pretty much got an understanding of attenuation for practical
purposes. I got a lead on a "sample" of RG304 that the engineer might be
able to locate. Four conductor double shielded cable will work for the
Artex ELT, so I'll go that route. The shield the then used as the ground
connector per the Artex installation instructions. As others go the 406
route and the February 2009 date gets closer, I suspect that demand will
grow. Again, thanks for the reply on a holiday weekend. Please enjoy your
Memorial Day.
Jeff Davidson
--
10:47 AM
incoming mail is certified Virus Free.
Checked by AVG.
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Bob . . .
----------------------------------------
( "Physics is like sex: sure, it may )
( give some practical results, but )
( that's not why we do it." )
( )
( Richard P. Feynman )
----------------------------------------
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