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cjhukill(at)cox.net
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 Posted: Sat Jun 09, 2007 6:16 pm Post subject: glide slope antenna |
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I recently added a Garmin 430 WAAS to my RV8, and used a Bob Archer antenna in the wing tip, with a splitter for VLOC and Glide slope. The signal strength is OK for the VLOC, however it's too weak to drive the Glide slope, until right on top of the runway threshold. The avionics shop put the tester on on it, and it checks OK, but with the long RG58 run, and a splitter there just isn't enough gain.
So I guess the fix is another (G/S) antenna. I don't want anything else dangling in the breeze, so I'm thinking about a RST Technologies dipole antenna (kit) glassed into the lower cowl.
My question is: has anyone had any experience with this type antenna, and are there any sources besides RST, as when I called them for advise, they where unwilling to answer questions, or provide any help.
Thanks
cjhukill(at)cox.net (cjhukill(at)cox.net)
[quote][b]
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Bruce(at)glasair.org
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| Posted: Sat Jun 09, 2007 7:29 pm Post subject: glide slope antenna |
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Swap out that RG-58 cable with RG-400 before you change antennas. It might give you enough extra gain that the old antenna will work.
Bruce
www.glasair.org
[quote]
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Bruce(at)glasair.org
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| Posted: Sat Jun 09, 2007 9:37 pm Post subject: glide slope antenna |
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Am I the only one recieving multiple copies of the same emails from all of the Matronics list servers?
Bruce
www.glasair.org
[quote]
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bobf(at)feldtman.com
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| Posted: Sun Jun 10, 2007 4:35 am Post subject: glide slope antenna |
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You might try a pre-amp on the glideslope side - after the splitter, to boost the signal. I thought RVs were all aluminum; thus a cowl antenna inside wouldn't work. Check out QST (the ham journal) for sources for preamps - we hams use them a lot on VHF and UHF work
bobf
On 6/9/07, Chris Hukill <cjhukill(at)cox.net (cjhukill(at)cox.net)> wrote:[quote] I recently added a Garmin 430 WAAS to my RV8, and used a Bob Archer antenna in the wing tip, with a splitter for VLOC and Glide slope. The signal strength is OK for the VLOC, however it's too weak to drive the Glide slope, until right on top of the runway threshold. The avionics shop put the tester on on it, and it checks OK, but with the long RG58 run, and a splitter there just isn't enough gain.
So I guess the fix is another (G/S) antenna. I don't want anything else dangling in the breeze, so I'm thinking about a RST Technologies dipole antenna (kit) glassed into the lower cowl.
My question is: has anyone had any experience with this type antenna, and are there any sources besides RST, as when I called them for advise, they where unwilling to answer questions, or provide any help.
Thanks
cjhukill(at)cox.net (cjhukill(at)cox.net)
[quote]
[b]
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BobsV35B(at)aol.com
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| Posted: Sun Jun 10, 2007 5:12 am Post subject: glide slope antenna |
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Good Morning bobf,
Way out of my area of expertise, but I would look at replacing the wing tip antenna.
I have never used one, but I have used hundreds of conventional antennas. Fifty years ago, our VHF Navigation receivers required a pretty strong signal. However, the modern day sets can get an adequate signal from a wet noodle!
I have often fed two Localizer/VORs and two glide slope receivers from one set of blades on the tail or one flying V style antenna. I understand that others have gotten suitable signals from wing tip antennas. Rather than patch on a repair to a non-performing antenna, I would locate a better antenna.
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
Stearman N3977A
Brookeridge Air Park LL22
Downers Grove, IL 60516
630 985-8503
In a message dated 6/10/2007 7:36:54 A.M. Central Daylight Time, bobf(at)feldtman.com writes:
| Quote: | You might try a pre-amp on the glideslope side - after the splitter, to boost the signal. I thought RVs were all aluminum; thus a cowl antenna inside wouldn't work. Check out QST (the ham journal) for sources for preamps - we hams use them a lot on VHF and UHF work
bobf
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See what's free at AOL.com.
[quote][b]
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nuckollsr(at)cox.net
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| Posted: Sun Jun 10, 2007 5:44 pm Post subject: glide slope antenna |
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At 09:11 AM 6/10/2007 -0400, you wrote:
| Quote: | Good Morning bobf,
Way out of my area of expertise, but I would look at replacing the wing
tip antenna.
I have never used one, but I have used hundreds of conventional antennas.
Fifty years ago, our VHF Navigation receivers required a pretty strong
signal. However, the modern day sets can get an adequate signal from a wet
noodle!
I have often fed two Localizer/VORs and two glide slope receivers from one
set of blades on the tail or one flying V style antenna. I understand
that others have gotten suitable signals from wing tip antennas. Rather
than patch on a repair to a non-performing antenna, I would locate a
better antenna.
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You beat me to it Robert. I was mystified as to why
the installation cited was proving inadequate. As you've
correctly noted, the LOC/GS signals off the approach end
of the runway are huge . . . a simple two-band splitter
would have to be REALLY bad to cut the GS useful range
from 15 miles down to 7 . . . but to squash it all the
way to the threshold strongly suggests some factor
or combination of factors unrelated to the architecture.
Bob . . .
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nuckollsr(at)cox.net
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| Posted: Sun Jun 10, 2007 5:57 pm Post subject: glide slope antenna |
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At 01:37 AM 6/10/2007 -0400, you wrote:
| Quote: | Am I the only one recieving multiple copies of the same emails from all of
the Matronics list servers?
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The only way I can think this might happen is that your e-mail
address got duplicated in the server's file of recipients. Try
going to . . .
http://www.matronics.com/subscribe/
put your email address in the box, hit the "find" button
followed by "execute". You should get a dump of all the lists
to which you've subscribed.
Now hit "uncheck all" and hit execute again. This should clear
all your subscriptions. Go back and do the find again an see if
you're still listed. If so, you've probably cleared out the duplicate
listing. If not, then recheck all the list services you're interested
in and "execute". If this exercise doesn't clear the problem,
drop a note to Matt Dralle. The fix may require a manual editing
effort on the file of subscribed addresses.
Bob . . .
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cjhukill(at)cox.net
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| Posted: Thu Jun 14, 2007 5:42 am Post subject: Glide slope antenna |
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Last week I posted a question about my non working G/S in my newly installed upgraded RV8 panel. Thanks for all the suggestions!. Bob Archer said I might be "loosely connected" as the problem. Rather than take offense at this, I asked for an explanation, and he said the BNC center pin may not be fully seated in the connector. Well the only connector that was not installed on the bench, but rather behind the panel, sure enough was loosely connected, because of the difficult access. After changing that out, the system works perfectly, IE the wingtip antenna, with splitter to the G430 VLOC and G/S has a nice strong signal.
NOW for the really good news. It turns out the TruTrak ADI pilot autopilot not only flys the GPS approaches just fine, but it flys the ILS localizer right down the center of the runway. Of course it's really flying the GPS overlay, but it's the same course, with the same accuracy. The CDI shows you the LOC, but the ADI Pilot looks at the GPS. This is perfectly legal to do despite the fact that the TruTrak people told me it wouldn't fly a GPS approach without roll steering. Of course they are talking a full procedure turn, or holding pattern entry, but for vectors to final it'll do the job. So anyone on a tight budget might want to consider this (G430 and ADI Pilot) solution as a very capable "punch the summer stratus" system.
Chris Hukill
[quote][b]
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nuckollsr(at)cox.net
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| Posted: Thu Jun 14, 2007 4:48 pm Post subject: Glide slope antenna |
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At 06:36 AM 6/14/2007 -0700, you wrote:
| Quote: | Last week I posted a question about my non working G/S in my newly
installed upgraded RV8 panel. Thanks for all the suggestions!. Bob Archer
said I might be "loosely connected" as the problem. Rather than take
offense at this, I asked for an explanation, and he said the BNC center
pin may not be fully seated in the connector. Well the only connector that
was not installed on the bench, but rather behind the panel, sure enough
was loosely connected, because of the difficult access. After changing
that out, the system works perfectly, IE the wingtip antenna, with
splitter to the G430 VLOC and G/S has a nice strong signal.
|
Pesky electrons . . . they just refuse to jump even the smallest
gap.
Bob . . .
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