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martyfnhill(at)gmail.com
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 Posted: Thu Oct 15, 2020 1:20 pm Post subject: GTR-200 garbeled reception |
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I bought a project Pitts, went through the whole thing and have recently started having radio issues. The basic problem is that reception intermittently becomes "noisy" and garbled. There's never noise that breaks through squelch; normal reception just gets loud, static-y and unintelligible. (Just what you need immediately after takeoff or on a go-around.) First problems didn't occur until there was about 10-15 hours on the new electrical system and radio; the garbled reception seems to happen more at high power than lower power, but again just not all the time.
Basic aircraft system:
IO-360 / Slick Magnetos
SD-8 PMG, B&C regulator and crowbar OVM
Earth-X battery
LW starter
KT-76A Xpnder and encoder
Headsets inc Noise-cancelling headset power supply
Combo clock/voltmeter/timer/G-meter
GTR-200
-Headset, Mic, Music inputs
GTR-200 troubleshooting:
-Re-seated radio (no effect)
-Tried multiple headsets (no effect)
Aircraft Systems troubleshooting:
-SD-8 - off (no effect)Â (fuse pulled/switch off) (no effect)
-Propeller RPM drastically reduced (most improvement)
-Transponder on/off (other than physical high-pitched tone from transponder, no effect)
Airframe troubleshooting:
-Checked antenna connection at both ends (antenna cable made by local avionics shop)
-checked P-leads and shielding connections at both endsÂ
-Found ring terminal from starter ground-aircraft ground slightly loose, new ring installed.
-Inspected ignition switch ground (left side of fuse), avionics ground (right side of fuse, same station)
-Inspected jack connections and checked fiber washers installed
-Removed stereo input jack (non aviation) from panel, tucked away and insulated it (no effect)
I talked to Garmin and based on the fact it was fine for the first few hours, and it only tramples reception, never breaks through squelch that it is probably a bad unit. Any other avenues of investigation are appreciated!
Thanks,
Marty Hill
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nuckolls.bob(at)aeroelect
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| Posted: Fri Oct 16, 2020 6:26 am Post subject: GTR-200 garbeled reception |
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At 04:16 PM 10/15/2020, you wrote:
| Quote: | I bought a project Pitts, went through the whole thing and have recently started having radio issues. The basic problem is that reception intermittently becomes "noisy" and garbled. There's never noise that breaks through squelch; normal reception just gets loud, static-y and unintelligible. (Just what you need immediately after takeoff or on a go-around.) First problems didn't occur until there was about 10-15 hours on the new electrical system and radio; the garbled reception seems to happen more at high power than lower power, but again just not all the time.
<snip>
I talked to Garmin and based on the fact it was fine for the first few hours, and it only tramples reception, never breaks through squelch that it is probably a bad unit. Any other avenues of investigation are appreciated! |
If I were tasked to duplicate the conditions
you've observed with 'adjustments' to stuff
outside the radio, I don't know where I would
start. I'm thinking this is internal to the
radio. Sounds like a vibration sensitive fault
inside.
Bob . . .
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Fri Oct 16, 2020 6:39 am Post subject: GTR-200 garbeled reception |
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If Garmin is saying it is the unit, and it is under warranty, I would
get an RMA and send it in. Let them fix or replace it.
Kelly
On 10/16/2020 7:24 AM, Robert L. Nuckolls, III wrote:
| Quote: | At 04:16 PM 10/15/2020, you wrote:
> I bought a project Pitts, went through the whole thing and have
> recently started having radio issues. The basic problem is that
> reception intermittently becomes "noisy" and garbled. There's never
> noise that breaks through squelch; normal reception just gets loud,
> static-y and unintelligible. (Just what you need immediately after
> takeoff or on a go-around.)Â First problems didn't occur until there
> was about 10-15 hours on the new electrical system and radio; the
> garbled reception seems to happen more at high power than lower power,
> but again just not all the time.
>
> <snip>
>
> I talked to Garmin and based on the fact it was fine for the first few
> hours, and it only tramples reception, never breaks through squelch
> that it is probably a bad unit. Any other avenues of investigation
> are appreciated!
If I were tasked to duplicate the conditions
you've observed with 'adjustments' to stuff
outside the radio, I don't know where I would
start. I'm thinking this is internal to the
radio. Sounds like a vibration sensitive fault
inside.
Bob . . .
|
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
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eschlanser
Joined: 08 Apr 2010
Posts: 60
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| Posted: Sat Oct 17, 2020 5:47 am Post subject: Re: GTR-200 garbeled reception |
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Marty,
Have you tried it in another aircraft that has a GTR-200 that is working? I had a similar problem with my GNS-430W. I don’t know how similar these two radios’ connectors are, but I verified my radio was ok by testing it in another airplane. Then I started troubleshooting my installation. I thought I had it seated ok, but it only takes but a tiny, tiny bit to be not seated well. At least in mine anyway.
Check out the radio first, and go from there. Good luck.
Not an A&P,
Eric
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skywagon185(at)gmail.com
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| Posted: Tue Oct 20, 2020 11:54 am Post subject: GTR-200 garbeled reception |
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Ditto on Eric's suggestion....
Sometimes the "chassis" is mounted a tad too far back from the equipment panel front surface. When the radio is slid into the chassis some of the many pins don't connect well to the back chassis connectors. Solution is to remount the chassis by pulling it forward before securing it with its mounting screws.....
D
On Sat, Oct 17, 2020 at 6:47 AM eschlanser <eschlanser(at)yahoo.com (eschlanser(at)yahoo.com)> wrote:
| Quote: | --> AeroElectric-List message posted by: "eschlanser" <eschlanser(at)yahoo.com (eschlanser(at)yahoo.com)>
Marty,
Have you tried it in another aircraft that has a GTR-200 that is working? I had a similar problem with my GNS-430W. I don’t know how similar these two radios’ connectors are, but I verified my radio was ok by testing it in another airplane. Then I started troubleshooting my installation. I thought I had it seated ok, but it only takes but a tiny, tiny bit to be not seated well. At least in mine anyway.
 Check out the radio first, and go from there. Good luck.
Not an A&P,
Eric
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