Today's Message Index:
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1. 05:59 AM - Re: RG393 coax (user9253)
2. 09:43 AM - Re: RG393 coax (Robert L. Nuckolls, III)
3. 10:59 AM - RG393 coax (Fred Klein)
4. 11:57 AM - Re: RG393 coax (Robert L. Nuckolls, III)
5. 06:03 PM - battery cables (n1deltawhiskey@comcast.net)
6. 07:41 PM - Re: battery cables (Justin Jones)
Message 1
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Fred,
>From what I have read on previous posts, RG-58 is fine for the com radio.
You did not say how long the transponder coax is in your Europa. How long is it?
If the length is excessive, can you move the transponder closer to the antenna
as suggested in the Skyview installation manual?
I suggest that you call SteinAir and ask their advice. If it necessary to use
expensive cable, SteinAir can sell you only the length needed with professionally
installed connectors.
For others, here is a link to the Skyview installation guide:
http://www.dynonavionics.com/downloads/Install_Guides/SkyView_System_Installation_Guide-Rev_R_v11.0.pdf
See pages 11-12 through 11-13
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=431938#431938
Message 2
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>
>I'm skeptical of the notion that SkyView
>customers are using coax other than the widely
>available RG400 (M17-128), and I=99m VERY
>reluctant to spring for this RG393. I do intend to replace ALL of my RG58.
>
>Can someone who has some keen knowledge on this subject give me some
guidance?
Your gut reaction is on track . . .
Coax cable decisions for the vast majority of GA feed line
decisions is not unlike deciding which laundry soap to
use on your wash-n-wear shirts. Unless they are contaminated
with something extra-ordinary . . . like road tar . . .
the dirt-removing performance offered by any of the dozens
of choices on the laundry soap isle will produce satisfactory
results.
Take a peek down the 'laundry soap' isle for coax
cable . . .
http://tinyurl.com/kjjvuel
Who ever called out RG-393 for a general aviation
antenna installation should be banished for 30 days
to each lunch at McDonalds. This stuff has a 10AWG
center conductor and an outside diameter of 0.4"
If the coax was FREE, you'd still have to find connectors
and tools to install them . . . lots of $thrashing$ around
just to get 1db of loss in a 10' run at GPS frequencies.
If you REALLY want/need that kind of performance, consider
LMR-240 coax.
http://tinyurl.com/kw9s2n8
MUCH less expensive and easier route (0.24" diam) but
still problematic for acquisition and personal installation
of the desired connectors. Fortunately, there are folks
who will build a custom length of this cable with the
right connectors for a fraction of the cost of RG-393.
Contact this guy . . .
http://tinyurl.com/nz9cjpg
On the other hand, if you have connectors and tools for
RG400/RG141 . . . this stuff would probably be just
fine. I still have some 141 on hand . . . tell me what
connectors you need and I can probably make an attractive
offer ($0.13/inch and $5/connector). LMR-195 is superior
performance to RG58 and on a par with 400/141 . . . and
uses same tools/connectors as the RG series coax. I've
installed about a half dozen connectors on LMR-195 . . .
it's a little finicky but it's just another process to be
learned. Cool thing is that it's really inexpensive.
Bob . . .
Message 3
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Gentlemen=85thank you for your helpful replies=85
re: RG58 for COM
Dynon sez, "Regarding your choice of routing and coaxial cable,
in my personal experience as an Amateur Radio Operator, while RG58
coaxial cable will work, and work acceptably in the absence of other
signals and potential interference, it is overall a poor coaxial cable.
In the long run, especially now while you have the luxury of easy access
during the build process, you will be much better served, overall, in
the long term, by using the much better RG400 coaxial cable. It will
much better resist potential radio frequency interference sources within
the fuselage.
"Put it this way - with RG58, your COM radio will be "listening"
not only to signals coming in from the antenna, but also all the
"birdies" from within the fuselage. With RG400, your COM radio will only
be listening to the signals from the antenna.=94
re: Length of run for XPNDR coax in my aircraft=85
At present, the run is approx. 8 feet, however, this routing
puts it in the same raceway as my 4AWG feeder AND 4AWG ground=85(battery
and XPNDR antenna are aft of the cockpit)=85when upgrading my coax, I
was anticipating changing the routing so that it is separate from these
heavy duty power lines and this would increase the length of coax to
about 13 feet=85I MAY be able to relocate the XPNDR antenna to reduce
that distance to 10 feet.
re: Bob=92s comment:
> Your gut reaction is on track . . .
> Take a peek down the 'laundry soap' isle for coax
> cable . . .
>
> http://tinyurl.com/kjjvuel
=85I can only respond w/ a =93=85geesus=85=94=85as I previously
noted, my eyes were opened to a whole new world of coax=85it looks like
a very deep rabbit hole=85one which I need not explore further.
OK=85moving forward=85
I=92m going to order some RG400 (M17/128) for my XPNDR=85and
keep it in the raceway alongside the 4AWG feeders to keep the run as
short as possible. In doing so, I am relying on my memory of an older
post of Bob=92s which stated, if I recall correctly, that there is NO
EVIDENCE of coax performance being compromised by adjacency to 12v power
feeders. (I=92d appreciate a correction if I=92m in error.)
And since my set up allows for swapping out the RG58 for my COM
antenna anytime, I think I may just leave it in for now and replace it
w/ RG400 only if problems show up.
I=92m having one of those days where I say, =93=85screw it=85I
want to get this puppy airborne=85=94
Fred
Message 4
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>Im going to order some RG400 (M17/128) for my
>XPNDRand keep it in the raceway alongside the
>4AWG feeders to keep the run as short as
>possible. In doing so, I am relying on my memory
>of an older post of Bobs which stated, if I
>recall correctly, that there is NO EVIDENCE of
>coax performance being compromised by adjacency
>to 12v power feeders. (Id appreciate a correction if Im in error.)
Correct.
Bob . . .
Message 5
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Bob,
Several years ago I acquired pre-cut and connector installed battery cables - I
believe from you or B&C. I recently found that there was corrosion on one of
the PC680 battery ground terminal connections. I want to replace the offending
battery and install new #4 cables from each battery to the #2 ground cable. Though
the #2 cable connector was involved, only the area around the end of the
connector was involved so it can be restored, reused and protected; the wire
itself was also corroded in the case with the single #4 jumper.
I need one 4" wire length with connector tabs same side of cable, and one cable
3" wire length, connector tabs on opposite side of the cable, both #4 cable.
This will get the #2 wire removed from the battery terminals. I did not find pre-cut
and connector fitted cables on the B&C website.
Can you advise a source where I might obtain these?
Regards, Doug Windhorn
Message 6
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| Subject: | Re: battery cables |
Doug,
One option is to take your cables to a local welding supply store and purcha
se welding cable to replace them. They will cut the new cable to the correct
length and install the connectors of your choice. The welding cable is ver
y flexible and easy to work with.
The other option is to go to a marine supply store such as west marine and p
urchase the cables and connectors there. This option will be a bit more expe
nsive.
Good luck
Justin.
> On Oct 16, 2014, at 19:01, n1deltawhiskey@comcast.net wrote:
>
> Bob,
>
> Several years ago I acquired pre-cut and connector installed battery cable
s - I believe from you or B&C. I recently found that there was corrosion on o
ne of the PC680 battery ground terminal connections. I want to replace the o
ffending battery and install new #4 cables from each battery to the #2 groun
d cable. Though the #2 cable connector was involved, only the area around th
e end of the connector was involved so it can be restored, reused and protec
ted; the wire itself was also corroded in the case with the single #4 jumper
.
>
> I need one 4" wire length with connector tabs same side of cable, and one c
able 3" wire length, connector tabs on opposite side of the cable, both #4 c
able. This will get the #2 wire removed from the battery terminals. I did no
t find pre-cut and connector fitted cables on the B&C website.
>
> Can you advise a source where I might obtain these?
>
> Regards, Doug Windhorn
>
>
>
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>
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