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ron.mcgann(at)baesystems. Guest
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Posted: Tue Mar 07, 2006 1:41 pm Post subject: Coax reqts and antenna placement |
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G'day all,
I'm about to order coax for the antennas. Any recommendations on a convenient qty? RG400 or RG58 or other? Config will be:
Archer navs in each wingtip
bent whip on bottom
stright whip on top behind lid
XPDR on bottom fwd fuse
Any additional considerations on antenna placement? I'm not familiar with the exhaust configuration - are there any antenna locs to NOT use to avoid exhaust outflow? Any shadowing issues with gear legs etc ?
thanks in advance,
Ron
#187 fuse
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Tim(at)MyRV10.com Guest
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Posted: Tue Mar 07, 2006 2:14 pm Post subject: Coax reqts and antenna placement |
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I'm sure others may disagree that you'd need any more than
cheap stuff, but I'm all for the RG400. It's double
shielded, slick teflon coated, and low loss. Probably
the best you can do.
Tim Olson - RV-10 N104CD - Flying
do not archive
McGANN, Ron wrote:
Quote: | G'day all,
I'm about to order coax for the antennas. Any recommendations on a
convenient qty? RG400 or RG58 or other? Config will be:
Archer navs in each wingtip
bent whip on bottom
stright whip on top behind lid
XPDR on bottom fwd fuse
Any additional considerations on antenna placement? I'm not familiar
with the exhaust configuration - are there any antenna locs to NOT use
to avoid exhaust outflow? Any shadowing issues with gear legs etc ?
thanks in advance,
Ron
#187 fuse
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ddddsp1(at)juno.com Guest
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Posted: Tue Mar 07, 2006 3:35 pm Post subject: Coax reqts and antenna placement |
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RG 400 cable on EBAY for .99 per foot.
DEAN
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av8or(at)cox.net Guest
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Posted: Tue Mar 07, 2006 8:23 pm Post subject: Coax reqts and antenna placement |
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I'm assuming this is VFR only or no ILS because you don't mention a marker beacon antenna. Why put an antenna on top? All communications will be downward except on the ground. Our RV-9A hasn't had any problems with comm on the bottom antenna (it only has one). There was a slight shadowing from the wing on testing, but a few degrees of turn resolved it. The plane was very close to the tower and it worked OK, but not full strength (according to the tower). No shadowing from the gear known of.
How about you hams? Y'all are the experts.
John Lenhardt
#40262
Do Not Archive
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ron.mcgann(at)baesystems. Guest
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Posted: Tue Mar 07, 2006 9:14 pm Post subject: Coax reqts and antenna placement |
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Thanks John. IFR - yes I neglected the Marker antenna in the wing. Couple of reasons for the top antenna.
1. Straight antenna has better performance than a bent whip
2. Comant recommend Com1 on top of acft
3. Rough strips here in Oz - any branch or other litter thrown up during takeoff/landing could just as easily take out both belly antennas (if you are really unlucky).
4. Obscuration by wings/fuse at long distance to a fixed VHF station is minimal, therefore no real penalty for a top mount.
I am sure others will have a different view, but I'm comfortable with my decision.
cheers,
Ron
Do not archive
[quote] --
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LarryRosen
Joined: 16 Jan 2006 Posts: 415 Location: Medford, NJ
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Posted: Wed Mar 08, 2006 2:30 pm Post subject: Coax reqts and antenna placement |
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McGANN, Ron wrote:
Quote: | ......
I am sure others will have a different view, but I'm comfortable with
my decision.
cheers,
Ron
Do not archive
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Thats why we are building experimentals. So we can make our own
choices.
Larry
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_________________ Larry Rosen
#40356
N205EN (reserved)
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av8or(at)cox.net Guest
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Posted: Wed Mar 08, 2006 5:07 pm Post subject: Coax reqts and antenna placement |
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While we're on the subject and for those planning on ILS, where is the glideslope antennas being mounted? I was thinking of putting it above the windscreen, maybe glassing it into the canopy, and running the coax down the support. Any better suggestions or experiences?
John Lenhardt
#40262
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dlm46007(at)cox.net Guest
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Posted: Wed Mar 08, 2006 5:28 pm Post subject: Coax reqts and antenna placement |
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why not install a SL30; the loc antenna input is good for both loc and gs?
[quote] ---
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schmoboy
Joined: 26 Feb 2006 Posts: 130
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Posted: Wed Mar 08, 2006 5:36 pm Post subject: Coax reqts and antenna placement |
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On Mar 8, 2006, at 6:07 PM, John Lenhardt wrote:
Quote: | While we're on the subject and for those planning on ILS, where is the glideslope antennas being mounted? I was thinking of putting it above the windscreen, maybe glassing it into the canopy, and running the coax down the support. Any better suggestions or experiences?
John Lenhardt
#40262
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I'm using an archer antenna in both wingtips. Nav2 of those will be diplexed as the GS antenna.
-Sean #40303 (wing bottom skins)
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rvbuilder(at)sausen.net Guest
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Posted: Thu Mar 09, 2006 4:04 am Post subject: Coax reqts and antenna placement |
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Not too many people actually put in the old bowtie glideslope antenna anymore. Save yourself the drag and just split it off of your nav antenna or call Bob Archer and ask him to make you one.
Michael Sausen
RV-10 #352 Working on Fuselage
Do Not Archive
Recent RV-10 Build Activity
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of John Lenhardt
Sent: Wednesday, March 08, 2006 7:07 PM
To: rv10-list(at)matronics.com
Subject: Re: Coax reqts and antenna placement
While we're on the subject and for those planning on ILS, where is the glideslope antennas being mounted? I was thinking of putting it above the windscreen, maybe glassing it into the canopy, and running the coax down the support. Any better suggestions or experiences?
John Lenhardt
#40262
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GRANSCOTT(at)aol.com Guest
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Posted: Thu Mar 09, 2006 4:32 am Post subject: Coax reqts and antenna placement |
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Serious future IFR flying...consider adding a WAAS enabled GPS to the mix...maybe something you'll really need long term.
Looking forward to meeting some of you at SnF. Any of you going to the EAA's Chapter Leader's BBQ on Thursday evening?
Patrick Scott
do not archive
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Jerry Grimmonpre'
Joined: 09 Jan 2006 Posts: 144 Location: Huntley, Illinois 60142
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Posted: Thu Mar 09, 2006 11:37 am Post subject: Coax reqts and antenna placement |
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Hi David,
Please excuse my butting-in on this subject line ... does your statement below also mean the SL30 loc antenna input would receive all three (NAV included) ... plus LOC and GS?
Thanks ...
Jerry Grimmonpre'
RV8A Electrical
Huntley IL
[quote] ---
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Tim(at)MyRV10.com Guest
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Posted: Thu Mar 09, 2006 12:00 pm Post subject: Coax reqts and antenna placement |
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FWIW, I used the Comant CI-157P cat whiskers VOR/LOC/GS antenna
and with just the one cable connected in to my SL-30 I have
all functionality. I also used the Bob Archer NAV into my
GNS-480 with just the single connector and I get VOR/LOC/GS
signals there too.
Tim Olson - RV-10 N104CD - Flying
do not archive
Jerry Grimmonpre wrote:
[quote] Hi David,
Please excuse my butting-in on this subject line ... does your statement
below also mean the SL30 loc antenna input would receive all three (NAV
included) ... plus LOC and GS?
Thanks ...
Jerry Grimmonpre'
RV8A Electrical
Huntley IL
---
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schmoboy
Joined: 26 Feb 2006 Posts: 130
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Posted: Thu Mar 09, 2006 12:09 pm Post subject: Coax reqts and antenna placement |
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Tim Olson wrote:
Quote: |
FWIW, I used the Comant CI-157P cat whiskers VOR/LOC/GS antenna
and with just the one cable connected in to my SL-30 I have
all functionality. I also used the Bob Archer NAV into my
GNS-480 with just the single connector and I get VOR/LOC/GS
signals there too.
Tim Olson - RV-10 N104CD - Flying
do not archive
That's because those radios jave built in diplexers right?
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-Sean #40303
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Jerry Grimmonpre'
Joined: 09 Jan 2006 Posts: 144 Location: Huntley, Illinois 60142
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Posted: Thu Mar 09, 2006 12:26 pm Post subject: Coax reqts and antenna placement |
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Thanks Tim ...
Is the Bob Archer NAV the wingtip install? Do you receive with the Bob
Archer OK if the station is on the opposite side from the antenna?
Jerry Grimmonpre'
Quote: |
FWIW, I used the Comant CI-157P cat whiskers VOR/LOC/GS antenna
and with just the one cable connected in to my SL-30 I have
all functionality. I also used the Bob Archer NAV into my
GNS-480 with just the single connector and I get VOR/LOC/GS
signals there too.
Tim Olson - RV-10 N104CD - Flying
do not archive
Jerry Grimmonpre wrote:
> Hi David,
> Please excuse my butting-in on this subject line ... does your statement
> below also mean the SL30 loc antenna input would receive all three (NAV
> included) ... plus LOC and GS?
> Thanks ...
> Jerry Grimmonpre'
> RV8A Electrical
> Huntley IL
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Tim(at)MyRV10.com Guest
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Posted: Thu Mar 09, 2006 12:33 pm Post subject: Coax reqts and antenna placement |
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I had to look it up...
SL-30 Install manual page 3 - Features * Internal RF Diplexor
Page 16: "It's size dictates room for only one Comm Antenna
input and one NAVS antenna input. It conforporates an internal
diplexor circuit. This means that the input VHF signal must not
strip the glideslope 330Mhz signal from the NAV 108Mhz signal.
Bold:DO NOT INSTALL AN EXTERNAL DIPLEXOR"
GNS480 Install manual page 2-43: "The GNS 480 incorporates
an internal diplexor circuit. <then more of the same as above>"
"...It is recommended that a single VOR/Localizer/Glideslope antenna be
used for the installation. Most VOR/LOC-ony antennas will still
provide an adequate glideslope signal for the GNS 480 to operate
normally."
Then further....for those who only want one antenna (you WILL
lose some signal to each system if you do this):
"If two nav receivers (e.g. one GNS480 and one SL30) are
installed in the aircraft, a splitter must be used.
Installation should use an appropriate splitter, such as the
Mini-Circuits ZFSC-2-1B BNC, available as an option under the
Garmin AT part number 115-0007."
** This should not be necessary if you have 2 antennas
Looks like the SL-30 and GNS480 make things a bit simpler
to install.
Tim Olson - RV-10 N104CD - Flying
Sean Stephens wrote:
Quote: |
Tim Olson wrote:
>
>
> FWIW, I used the Comant CI-157P cat whiskers VOR/LOC/GS antenna
> and with just the one cable connected in to my SL-30 I have
> all functionality. I also used the Bob Archer NAV into my
> GNS-480 with just the single connector and I get VOR/LOC/GS
> signals there too.
>
> Tim Olson - RV-10 N104CD - Flying
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Quote: | >
That's because those radios jave built in diplexers right?
-Sean #40303
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Tim(at)MyRV10.com Guest
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Posted: Thu Mar 09, 2006 12:45 pm Post subject: Coax reqts and antenna placement |
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Yes, it's the wingtip install. Pretty simple. I used it
for my #2 NAV as I trust the tail mounted (underside)
cat whiskers more, due to the shielding of the airframe
that I can tell is what you're concerned about. Sorry, but
so far I haven't done enough approaches to say if it gets great signal
when it's shielded by the airframe. I'll try to make it a point to
pay attention to that and let the group know.
Tim
Tim Olson - RV-10 N104CD - Flying
do not archive
Jerry Grimmonpre wrote:
Quote: |
Thanks Tim ...
Is the Bob Archer NAV the wingtip install? Do you receive with the Bob
Archer OK if the station is on the opposite side from the antenna?
Jerry Grimmonpre'
>
>
> FWIW, I used the Comant CI-157P cat whiskers VOR/LOC/GS antenna
> and with just the one cable connected in to my SL-30 I have
> all functionality. I also used the Bob Archer NAV into my
> GNS-480 with just the single connector and I get VOR/LOC/GS
> signals there too.
>
> Tim Olson - RV-10 N104CD - Flying
> do not archive
> Jerry Grimmonpre wrote:
>> Hi David,
>> Please excuse my butting-in on this subject line ... does your
>> statement below also mean the SL30 loc antenna input would receive
>> all three (NAV included) ... plus LOC and GS?
>> Thanks ...
>> Jerry Grimmonpre'
>> RV8A Electrical
>> Huntley IL
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Tdawson(at)avidyne.com Guest
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Posted: Thu Mar 09, 2006 12:57 pm Post subject: Coax reqts and antenna placement |
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Yeah, SL30 has a built-in splitter . . .
TDT
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Jerry Grimmonpre
Sent: Thursday, March 09, 2006 2:35 PM
To: rv10-list(at)matronics.com
Subject: Re: Coax reqts and antenna placement
Hi David,
Please excuse my butting-in on this subject line ... does your statement below also mean the SL30 loc antenna input would receive all three (NAV included) ... plus LOC and GS?
Thanks ...
Jerry Grimmonpre'
RV8A Electrical
Huntley IL
[quote]
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Kellym
Joined: 10 Jan 2006 Posts: 1700 Location: Sun Lakes AZ
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Posted: Thu Mar 09, 2006 8:54 pm Post subject: Coax reqts and antenna placement |
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You could probably remove the cat whiskers and replace with external
diplexer. I have two triplexers in my Mooney, to feed two older nav coms
each with separate glideslope receivers, all running of a single cat
whisker antenna, reception is fine.
Tim Olson wrote:
Quote: |
Yes, it's the wingtip install. Pretty simple. I used it
for my #2 NAV as I trust the tail mounted (underside)
cat whiskers more, due to the shielding of the airframe
that I can tell is what you're concerned about. Sorry, but
so far I haven't done enough approaches to say if it gets great signal
when it's shielded by the airframe. I'll try to make it a point to
pay attention to that and let the group know.
Tim
Tim Olson - RV-10 N104CD - Flying
do not archive
Jerry Grimmonpre wrote:
>
>
> Thanks Tim ...
> Is the Bob Archer NAV the wingtip install? Do you receive with the
> Bob Archer OK if the station is on the opposite side from the antenna?
> Jerry Grimmonpre'
>>
>>
>> FWIW, I used the Comant CI-157P cat whiskers VOR/LOC/GS antenna
>> and with just the one cable connected in to my SL-30 I have
>> all functionality. I also used the Bob Archer NAV into my
>> GNS-480 with just the single connector and I get VOR/LOC/GS
>> signals there too.
>>
>> Tim Olson - RV-10 N104CD - Flying
>> do not archive
>>
>>
>> Jerry Grimmonpre wrote:
>>> Hi David,
>>> Please excuse my butting-in on this subject line ... does your
>>> statement below also mean the SL30 loc antenna input would receive
>>> all three (NAV included) ... plus LOC and GS?
>>> Thanks ...
>>> Jerry Grimmonpre'
>>> RV8A Electrical
>>> Huntley IL
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_________________ Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
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