Today's Message Index:
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1. 05:52 AM - SL-30 issues (Ralph E. Capen)
2. 03:52 PM - radio noise on xmit & xponder interrogation (Rowland Carson)
Message 1
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Folks,
I'm just under 31 hours in to my test flying and have been trying to
make sure everything in the panel is working properly.
I'm trying to get the SL30 to power the S-TEC-30/GPSS autopilot (through
the Century NSD1000 HSI) - and it doesn't seem to want to play. In the
test mode, I can get the to/from, left/right, up/down, and NAV/GS flags
to do what they're supposed to so I'm pretty confident that the wiring
is OK. I can also tune in and hear the morse for the VOR station and
verify the correct radial (with another NAV radio that isn't hooked to
the autopilot) and the SL30 correctly displays to/from station and
radial on it's face - So I'm thinking that the radio is working OK.
Obviously, I need to break out the user manual for this thing - and
maybe brush up on my VOR navigation techniques (but I was able to verify
station and radial with another NAV radio). I think that I may also
need to call Garmin/UPSAT/Apollo/IIMorrow tech support...after I read
the manual.
What do you think - what are the chances that my radio display output is
hosed? It needs to go back for the SB fix anyway - so I may just bite
the bullet.....
Thanks,
Ralph
N822AR @ N06 - still flying off the hours......
Message 2
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| Subject: | radio noise on xmit & xponder interrogation |
My friend Tim (who does not inhabit this list) has had a problem
arise with his comm radio that seems to have arisen suddenly, without
any changes to the installation.
He has a MicroAir 760 comm radio, with a FlightTech ITC402P intercom,
installed in a Europa.
Symptoms: intercom works fine, other stations' transmissions heard fine.
When either (P1 or P2) of the PTT buttons is pressed, a loud
distorted noise immediately occurs in both (noise-cancelling)
headsets. The words of the person speaking are barely discernable
through this. However, anyone listening to the transmission on
another comm radio hears the voice OK with no distortion (well, no
more than usual on any airband R/T!). So, the bad stuff is only
happening on the sidetone circuit, not on the signal going out to the
transmitter.
A noise also occurs when the transponder is interrogated. It's
usually not quite so loud as that heard with the PTT, and sounds like
white noise in character. This does seem to come and go - on a recent
trip we got so fed up with TSST, TSST, TSST at irregular intervals in
the headphones that we turned off the xponder on the outbound leg
because we couldn't concentrate. On the return leg we tried it to see
if it was still happening - it seemed considerably quieter and then
after some time ceased to occur at all (we were still getting
interrogated).
However, the distorted sidetone problem remained unabated.
These may be 2 separate things but it's suspicious they have
materialised at the same time.
I'm a bit puzzled as to why this should have suddenly sprung up. My
feeling is that it may be some poor earthing or poor screening in the
microphone leads. But it would need to be somewhere common to both
headset circuits as it is affecting each equally.
We are planning a longer trip this weekend (3 hours each way) and
will need to do much more talking this time. If there was a simple
fix to try before then I'd love to hear about it!
regards
Rowland
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| Rowland Carson http://home.clara.net/rowil/
| <rowil@clara.net> ... that's Rowland with a 'w' ...
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