Today's Message Index:
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1. 07:20 AM - Re: Com radio malfunction (Robert L. Nuckolls, III)
2. 02:29 PM - Re: Rotax 912 ULS schematics (GTH)
Message 1
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| Subject: | Re: Com radio malfunction |
>At 06:44 PM 8/19/2021, you wrote:
>Can anyone help me with this?
>I bought an Apollo/UPS GX65 GPS/COM back in the 90's new from the factory.
>When I finished my RV6 I installed the radio and found that the COM side
>was doa. The radio display showed it powering up.
>I checked all wiring except for the antenna leads and found no wiring
>problems.
>
>I had someone repair the radio (who replaced a component but won't
>tell me what the actual problem was) and am now reluctant to install
>it again in case it blows up again.
>
>My question is: can an open or a short to ground in the antenna
>lead cause the output circuits of the radio to fail? I plan to
>check the antenna lead but it requires a major disassembly to get
>to the antenna connection.
Did the radio receive? Go ahead . . . install it and
power up. See if it receives signals from local
aviation facility or perhaps a hand-held. Antenna
problems are almost never root cause for gross
failure of components and then only transmitter
components are at-risk . . . if at all.
I would pressure your repair-person for a more
illuminating narrative of the problem and his/her
opinion as to root cause. But if they're less
than 50 years old, work-bench system diagnostics
are problematic. Techs understand radios pretty
good. Understanding airplanes and aviation operations
are something else. Information concerning those repairs
belongs to you, you paid for it.
But see if the radio receives first. Can you manually
open the squelch (no-signal noise silencer). You should
get a rushing, water-fall like noise when not receiving
a signal. This is a good indication of receiver
function. Try listening to a hand-held radio. If the
RX is working, then go for the TX . . . it's probably
just fine too.
If this is a new, never been used antenna installation,
an SWR check is never a bad idea whether the radio
seems to be working or not. Having a good SWR reading
goes more to in-flight performance later than risks
to the radio.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 2
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| Subject: | Re: Rotax 912 ULS schematics |
Le 10/08/2021 18:11, Neal George a crit:
>
> Gentlemen -
> Searching for schematics for the Rotax 912 ULS reveals a few block diagrams,
but nothing with any detail. Even the maintenance and installation manuals are
thin on specifics.
>
> Specifically, I need the pin-out for the two 6-pin connector blocks for the Ignition
modules...
>
Hi all,
Would that help
http://contrails.free.fr/engine_rotax_mag_connect_en.php
Best regards,
Gilles
http://contrails.free.fr
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