Today's Message Index:
----------------------
1. 01:24 AM - Re: Re: RG-400 Coax (Bob Leffler)
2. 07:57 AM - Re: Re: RG-400 Coax (Kelly McMullen)
3. 08:03 AM - Re: Re: RG-400 Coax (Kelly McMullen)
4. 01:26 PM - Re: RG-400 Coax (Bob Turner)
5. 06:40 PM - Re: Re: RG-400 Coax (John MacCallum)
Message 1
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Your install manuals will specify the manufacturer=92s requirements for typ
e and length of cable.
Get Outlook for iOS<https://aka.ms/o0ukef>
________________________________
From: owner-rv10-list-server@matronics.com <owner-rv10-list-server@matronic
s.com> on behalf of kearney <kearney@shaw.ca>
Sent: Saturday, April 7, 2018 10:06:20 PM
Subject: RV10-List: Re: RG-400 Coax
Kelley
It was my understanding that RG400 was preferred for a/c. Based on your com
ment I will check into this with Stein before I order anything.
I have two comm runs to the tail along with a VOR/ILS antenna. That with th
e 2 GPS antennas and XM weather and it adds up quickly.
Cheers
Les
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479159#479159
Message 2
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On 4/8/2018 1:24 AM, Bob Leffler wrote:
> Your install manuals will specify the manufacturers requirements for
> type and length of cable.
>
> Get Outlook for iOS <https://aka.ms/o0ukef>
> ------------------------------------------------------------------------
I looked through the manuals I have on hand. The KX-155/165 manual only
mentions RG-58. That includes its discussion of what is approved for
full TSO approval.
The GNS-400 series mentions 50 ohm shielded cable. I didn't find mention
of RG-400 (alternate RG-142) until I got to the GTN-600 series install
manual. In other words, even Garmin didn't start recommending RG-400
until about 10 years ago.
The Dynon Skyview manual asserts that double shielded cable will deliver
"more" transmit power and receive signal than single shielded, with no
definition or quantification of how much more.
It is funny that the SL-30 manual calls for RG-142, and Garmin shows it
as acceptable alternate. RG-142 has a solid core connector, not
stranded. It is double shielded like RG-400. There was a discussion on
VAF about the differences, and pointing out that it has only been
sometime after the turn of the century that RG-400 started being
recommended.
IF you anticipate a "noisy" RF environment in your cockpit, go for the
best cable you can get. If your aircraft will have typical noise (very
little) you can choose whether you want to save a couple hundred bucks
or not.
Note that nothing has changed in VHF electronic signal transmission
since the days of the coffee grinder and crystal controlled transmitters.
The internal electronics have been better shielded to avoid transmission
of the RF generated during amplification of signals, etc. so that we get
better quality audio. Apollo introduced digital signal processing..maybe
that influences the call for better shielding..who knows.
It is pretty much the same difference as whether you choose to operate
at 75% power for all cruise, or if you choose to go high enough to
operate at 60-65% power and save a lot of fuel while sacrificing about
5-8% speed. Your airplane and money, your choice.
I haven't seen any install manual yet that says RG-400 is mandatory for
com or VHF nav...only for GPS.
Message 3
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I forgot to mention that we should discuss whether Les should prime his
antenna cables and with which type of primer. ;-)
On 4/8/2018 7:57 AM, Kelly McMullen wrote:
>
> On 4/8/2018 1:24 AM, Bob Leffler wrote:
> > Your install manuals will specify the manufacturers requirements for
> > type and length of cable.
> >
> > Get Outlook for iOS <https://aka.ms/o0ukef>
> > ------------------------------------------------------------------------
>
> I looked through the manuals I have on hand. The KX-155/165 manual only
> mentions RG-58. That includes its discussion of what is approved for
> full TSO approval.
Message 4
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Kellym wrote:
> I forgot to mention that we should discuss whether Les should prime his
> antenna cables and with which type of primer. ;-)
>
>
Thats actually a good analogy. Nearly any primer will look good tomorrow. How will
it perform in 10 years? Same question about less expensive/more expensive
coax on VHF radios. Only the builder can decide if the cost difference is worth
the risk/benefit.
--------
Bob Turner
RV-10 QB
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479180#479180
Message 5
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RG58 will work because the cable run is only short. The losses for a few metres
of Coax are not noticeable to us as users. There is an advantage though with
the double shielding and the Teflon outer Jacket of RG400. Less induced noise
and better abrasion resistance. Also it is better to use Multi Stand rather than
solid core cables because of vibration. For the money it costs to use RG400
compared to the over all costs involved with the building process, in my opinion,
RG400 is the way to go!
Cheers John MacCallum
RV10
VH-DUU
Flying
> On 9 Apr 2018, at 00:57, Kelly McMullen <kellym@aviating.com> wrote:
>
>
> On 4/8/2018 1:24 AM, Bob Leffler wrote:
> > Your install manuals will specify the manufacturers requirements for
> > type and length of cable.
> >
> > Get Outlook for iOS <https://aka.ms/o0ukef>
> > ------------------------------------------------------------------------
>
> I looked through the manuals I have on hand. The KX-155/165 manual only mentions
RG-58. That includes its discussion of what is approved for full TSO approval.
> The GNS-400 series mentions 50 ohm shielded cable. I didn't find mention of RG-400
(alternate RG-142) until I got to the GTN-600 series install manual. In
other words, even Garmin didn't start recommending RG-400 until about 10 years
ago.
> The Dynon Skyview manual asserts that double shielded cable will deliver "more"
transmit power and receive signal than single shielded, with no definition
or quantification of how much more.
> It is funny that the SL-30 manual calls for RG-142, and Garmin shows it as acceptable
alternate. RG-142 has a solid core connector, not stranded. It is double
shielded like RG-400. There was a discussion on VAF about the differences,
and pointing out that it has only been sometime after the turn of the century
that RG-400 started being recommended.
> IF you anticipate a "noisy" RF environment in your cockpit, go for the best cable
you can get. If your aircraft will have typical noise (very little) you can
choose whether you want to save a couple hundred bucks or not.
> Note that nothing has changed in VHF electronic signal transmission since the
days of the coffee grinder and crystal controlled transmitters.
> The internal electronics have been better shielded to avoid transmission of the
RF generated during amplification of signals, etc. so that we get better quality
audio. Apollo introduced digital signal processing..maybe that influences
the call for better shielding..who knows.
> It is pretty much the same difference as whether you choose to operate at 75%
power for all cruise, or if you choose to go high enough to operate at 60-65%
power and save a lot of fuel while sacrificing about 5-8% speed. Your airplane
and money, your choice.
> I haven't seen any install manual yet that says RG-400 is mandatory for com or
VHF nav...only for GPS.
>
>
>
>
>
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