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recapen(at)earthlink.net
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 Posted: Mon Oct 24, 2011 2:07 pm Post subject: Two VOR/GS/LOC one antenna |
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Folks,
I have two VOR/GS/LOC radios
1. Apollo (now Garmin) SL-30
2. Narco NAV122D/GPS
Attached to a Comant CI-182 dual whisker antenna mounted on top ov my VS in my RV6A.
The Narco requires a diplexer which is installed and there is a Coax T-Connector before the diplexer as the SL-30 doesn't need to be seperated.
Recently, I was doing some practice work for my IFR training - holds at an intercept - requiring two VOR's. Consistently, the SL-30 can pick up either station while the NAV122D is flaky with both stations - but eventually will bring me to the intercept point.
I'm gonna guess it's not the antenna - as the SL-30 brings it in fine.
My thoughts go to three possible culprits.....the T-Connector, the diplexer, or the radio...question is, how to tell which one?
Getting the Narco repaired will bring the "Mission Impossible" theme song in the background - with Narco recently going under.
The diplexer is probably easily replaceable for just a few bucks as well as replacing the T-Connector with a Comant splitter (CI-5120).
Any opinions out there? I would really rather not replace the radio if the other items may really be the culprit......and I will probably need both VOR's to finish my IFR training and take my checkride.
Thanks in advance!
Ralph Capen
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gyoung
Joined: 09 Jan 2006
Posts: 211
Location: Republic of Texas
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| Posted: Mon Oct 24, 2011 5:53 pm Post subject: Two VOR/GS/LOC one antenna |
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You might try hooking the SL-30 to the LOC output of the diplexer. You won't have GS but re-flying your practice holds should let you evaluate if the signal getting to the Narco is degraded. You can use the SL-30 standby freq and obs for the 2nd Nav. The SL-30 is a great radio and routinely locks on stations 10-20nm (at ~100nm) before my 430W. The split for my 430W is done the same way as yours, a diplexer and T-connector.
Greg Young
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bakerocb
Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA
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| Posted: Tue Oct 25, 2011 4:28 am Post subject: Two VOR/GS/LOC one antenna |
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10/25/2011
Hello Ralph, You wrote: "and I will probably need both VOR's to finish my
IFR training and take my checkride."
I am puzzled by your problem. Since the SL-30 has simultaneous dual VOR
capability (providing radial information from one VOR to an external CDI to
track along and cross track radial information from a different VOR on the
face of the SL-30) why would you need to use the Narco NAV122D/GPS to get
information from a third VOR?
Do you lack a separate CDI for the SL-30 to feed or are you unable to feed
the CDI of the Narco unit with the SL-30 as described here?
"The NAV 122D/GPS is the same as the NAV 122D except it will include a
resolver, thus having the additional capability of being utilized as the
required "Left/Right Indicator", in IFR approved GPS or multi-sensor systems
installations."
'OC' Baker Says: "The best investment we can make is the time and effort to
gather and understand knowledge."
PS: I think that it was grossly misleading for Narco to attach the GPS
designation to their unit because it has absolutely no GPS capability, but
only provides a CDI to be fed in case a separate GPS or other sensor is
installed in the aircraft. See here:
http://www.aircraftspruce.com/catalog/avpages/narco122Dgps.php
===========================================================
Time: 03:07:20 PM PST US
From: "Ralph E. Capen" <recapen(at)earthlink.net>
Subject: Two VOR/GS/LOC one antenna
Folks,
I have two VOR/GS/LOC radios
1. Apollo (now Garmin) SL-30
2. Narco NAV122D/GPS
Attached to a Comant CI-182 dual whisker antenna mounted on top ov my VS in
my
RV6A.
The Narco requires a diplexer which is installed and there is aCoax
T-Connectorbefore
the diplexer as the SL-30 doesn't need to be seperated.
Recently, I was doing some practice work for my IFR training - holds at an
intercept
- requiring two VOR's. Consistently, the SL-30 can pick up either station
while the NAV122D is flaky with both stations - but eventually will bring me
to the intercept point.
I'm gonna guess it's not the antenna - as the SL-30 brings it in fine.
My thoughts go to three possible culprits.....the T-Connector, the diplexer,
or
the radio...question is, how to tell which one?
Getting the Narco repaired will bring the "Mission Impossible" theme song in
the
background - with Narco recently going under.
The diplexer is probably easily replaceable for just a few bucks as well as
replacing
the T-Connector with a Comant splitter (CI-5120).
Any opinions out there? I would really rather not replace the radio if the
other
items may really be the culprit......and I will probably need both VOR's to
finish my IFR training and take my checkride.
Thanks in advance!
Ralph Capen
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recapen(at)earthlink.net
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| Posted: Tue Oct 25, 2011 5:30 am Post subject: Two VOR/GS/LOC one antenna |
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Greg,
Thanks - something ultra-cheap to try from a troubleshooting perspective.
Ralph
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recapen(at)earthlink.net
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| Posted: Tue Oct 25, 2011 5:35 am Post subject: Two VOR/GS/LOC one antenna |
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Thanks OC!
Yes, the SL-30 can do that - I just need to read the manual - good reminder!
I do have it set up to act as a backup CDI - not as a primary head to a second NAV radio though...makes me rethink my panel strategy....
I'll start with re-reading the SL-30 manual for the dual capability.
Ralph
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Kellym
Joined: 10 Jan 2006
Posts: 1704
Location: Sun Lakes AZ
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| Posted: Tue Oct 25, 2011 6:13 am Post subject: Two VOR/GS/LOC one antenna |
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Remember that some of us are old enough to have taken our instrument
check rides with a single nav-com and ADF(no, I'm not old enough to have
used a 4 course AN range). Need a crossing radial? Better be fast on
dialing between frequencies and identifying. The SL-30 feature of
showing you the radial from the standby VOR is really all you
need..just get familiar with activating that feature.
On 10/25/2011 6:32 AM, Ralph E. Capen wrote:
| Quote: |
Thanks OC!
Yes, the SL-30 can do that - I just need to read the manual - good reminder!
I do have it set up to act as a backup CDI - not as a primary head to a second NAV radio though...makes me rethink my panel strategy....
I'll start with re-reading the SL-30 manual for the dual capability.
Ralph
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recapen(at)earthlink.net
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| Posted: Tue Oct 25, 2011 6:33 am Post subject: Two VOR/GS/LOC one antenna |
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Thanks Kelly,
Another vote for learning the features THat I have
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royalina
Joined: 15 Feb 2011
Posts: 8
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| Posted: Thu Nov 17, 2011 6:52 pm Post subject: Re: Two VOR/GS/LOC one antenna |
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You can use the SL-30 standby freq and obs for the 2nd Nav. The SL-30 is a great radio and routinely locks on stations 10-20nm (at ~100nm) before my 430W. ..........
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