Today's Message Index:
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1. 01:56 PM - King KX155 weak VOR reception (Jimmyb)
2. 04:45 PM - Manual for Vision microsystems EPI-800 engine monitor (Alan Barnett)
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Subject: | King KX155 weak VOR reception |
Hello all,
New member here! I'm having an issue that I wanted to share with some of the more
experienced members on here hoping to find a resolution.
I have two king KX-155 Nav/Coms one with GS and the other without GS installed
in a Glasair III with a single NAV antenna feeding both radios including GS via
a multiplexer. The NAV antenna is embedded in the horizontal stabilizer as
the Glasair is a composite aircraft. The NAV indicators are KI-209 and a KI-208.
Both indicators exhibit erratic needles when turning but only through a portion
of the turn (example: sometimes when intercepting a radial the needle will start
to move in and nearly be centered but as I roll out expecting to capture the
radial the needle suddenly moves three-quarter scale deflection. Also when
flying an ILS the GS flag pops in and out of view well down the approach when
the GS signal should be strong. All needles are not as stable as I think they
should be.
I recently had both radios checked out at the local avionics shop and they are
performing within specs.
The thought now is that I either have an antenna or a feedline issue. The multiplexer
currently has one open port that used to service a second glideslope receiver.
I've ordered a 50 ohm BNC terminator to cap the open port thinking
that I might be getting some reflections/interference that is causing the issue
but that has yet to be proven.
The aircraft was built in 1990 so all of the coax is original RG58. If the 50
ohm Terminator doesn't solve my problem the next logical step is to replace the
RG58 with RG400 but I'm starting to feel like I'm grasping at straws. With
no antenna analyzer/distance to fault meter I have no way to verify the condition
of the antenna/coax.
Questions:
1. Do you think it's likely that the open multiplexer port could be causing my
issues?
2. How likely is it that the old RG58 cable could be causing my issues?
3. Should I bite the bullet and buy an antenna analyzer such as the rigexpert AA
600?
NOTES: Because the NAV antenna is embedded in the horizontal stabilizer it is physically
impossible to access the antenna. The best that I can do will be to
replace the RG58 with RG400 but even at that there's will still be approximately
2 feet of the old RG 58 left that is inaccessible the so I will need to install
a BNC connector back near the tail to connect the old RG58 (short pigtail
that will still be connected to the antenna) with the new RG400.
Your ideas, tips & suggestions will be most appreciated!
James
Phoenix, AZ
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=426590#426590
Message 2
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Subject: | Manual for Vision microsystems EPI-800 engine monitor |
Does anyone have a digital copy of the manual for the Vision
microsystems EPI-800 engine monitor? I bought a plane with an EPI-800
installed, but most of the installation manual was lost.
I'm particularly interested in the wiring associated with the
backlighting system. At present, the backlighting doesn't work at all.
It's supposed to sense the voltage on the lighting bus. My plane has no
lighting bus, and the builder disconnected the lighting wiring for the
VOR head and the transpondes, so I assume he disconnected wiring for the
EPI-800 as well.
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