Today's Message Index:
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1. 08:32 AM - King GNS-80 (Chris Stone)
2. 10:18 AM - Re: King GNS-80 (Martini Luc J.R.)
Message 1
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--> Avionics-List message posted by: "Chris Stone" <Chris.Stone@a-dec.com>
Hello all,
I am collecting instruments and avionics as I construct my RV-8 in an
effort to spread the costs over time and to take advantage of "deals" as
I come across them.
Does anyone have experience with the King KNS-80? This is an all in one
unit that incorporates VOR/LOC/GS/DME in one box. From a panel space and
installation standpoint it has advantages. From a reliability standpoint
it would seem to be a single point failure item. Narco has a similar
unit (122 D) with VOR/LOC/GS.
OBS/LOC/GS indicators: Is there a standard I/O from receiver to
indicator or does each manufacturer have their own signal/data I/O? If
they are manufacturer specific is each manufacturer consistent or does
each manufacturer have variants within their own product lines? i.e. can
I use a Sperry indicator with a King receiver?
Antennas...
I have followed the discussions on antennas and have decided to go with
the Sportcraft VOR/COM wingtip antenna.
Can this also be used for the Localizer? I have a Marker Beacon and
Transponder antenna. Will I need a separate Glide Slope antenna?
I would like to keep the airframe clean i.e. no antennas hanging
everywhere. If a separate GS antenna is required can it be mounted
inside the fiberglass wingtip?
I realize I have posted questions that my require lengthy answers...
This is a great source for aircraft/avionics expertise, and a good one
it is! Thanks!
Chris Stone
RV-8 - wings
Slowly drying out in Oregon
Message 2
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--> Avionics-List message posted by: "Martini Luc J.R." <martini@foxinternet.net>
Hi
I am doing a war bird restoration rather than a new design. Our problems
are similar however, just for different reasons. With me, I want to keep
the original panel to the greatest extent possible. To that end, I am
replacing only one old instrument, The old Course Indicator will be
replaced with a Sandel SN3308 . Great "All in one" instrument like the new
"Glass Panels". It does require a Gyro Compass platform however. A/C
Spruce Sells them. The Sandel will accept ANY input.
Yes there is NO standardization in instrument inputs... you usually have to
buy the Manufacturers instrument or you start running into problems There
are even substantial variations from radio/instrument for various model by
the same manufacturer... i.e. even KING didn't bother to standardize their
pinouts and I/O.
The KNS-80 is a great and very capable radio, and a lot of bang for the
buck. I appreciate that it even has an internal VOR Converter, which on
KX-155's (for example) you have to add on with a monstrous externally
mounted box.
I think it is less failure prone than a standard discrete component layout
because one of the greatest source of failures is the connectors/wiring,
which here is all internal, well designed and out of harms way.
From the standpoint of Single Point Failures. About the only thing the
internal units have in common are Power and Ground leads. They internal
construction is still of seperate boards for each functional receiver. So,
No I do not believe it suffers from Single Point failures to any significant
degree, if you pay attentionn to the wire sizing requirements, and keep
ground lead length to a minimum, and use good Shielding wire and technique.
If you go with the KNS-80, you will also need a DME antenna. Since the
Transponder and DME cause mutual interference, the radios are usually lined
with a DME Suppression wire. Some ant. manufacturers have designed COMBO
antennas (DME/TRANSPONDER) I know the military used a fin antenna like
that.
The Beacon Ant is a 75Mhz device that is not close in Freq. to anything
else, so it will be seperate.
Comm and GS operate in the same Freq. Range, and some antennas combine the
two. (some via a diplexer/triplexer - depending on how many radios you
have). But you have to be careful because King does some funny things that
can screw you up if you are mixing various radios. You need to carefully
read the installation instructions BEFORE you buy go through it, and draw
out the hook up you want to make and see if it plays with the instructions.
The GS generally must be on the aircraft centerline, and simetrically laid
out, so I doubt that you will be able to put it in the wing tips.
There are several manufacturers that use a Fin on each side of the tail.
Having been rather impressed with the aerodynamic improvements with vortex
generators (low speed controlability at high angles of attack - called the
ELK STALL up in Alaska) simetrically on each side of the Vert Fin (usually
almost at the top) , I have wondered if the twin fin antenna arrangment
some manufactureres use would not actually be an improvement to the
airplane. I don't know if anyone had run the numbers. The Caravan for
example did not meet FAA requirements until they put Vortex Gens on the
tial.
Luc
----- Original Message -----
From: "Chris Stone" <Chris.Stone@a-dec.com>
Subject: Avionics-List: King GNS-80
> --> Avionics-List message posted by: "Chris Stone" <Chris.Stone@a-dec.com>
>
> Hello all,
>
> I am collecting instruments and avionics as I construct my RV-8 in an
> effort to spread the costs over time and to take advantage of "deals" as
> I come across them.
>
> Does anyone have experience with the King KNS-80? This is an all in one
> unit that incorporates VOR/LOC/GS/DME in one box. From a panel space and
> installation standpoint it has advantages. From a reliability standpoint
> it would seem to be a single point failure item. Narco has a similar
> unit (122 D) with VOR/LOC/GS.
>
> OBS/LOC/GS indicators: Is there a standard I/O from receiver to
> indicator or does each manufacturer have their own signal/data I/O? If
> they are manufacturer specific is each manufacturer consistent or does
> each manufacturer have variants within their own product lines? i.e. can
> I use a Sperry indicator with a King receiver?
>
> Antennas...
>
> I have followed the discussions on antennas and have decided to go with
> the Sportcraft VOR/COM wingtip antenna.
>
> Can this also be used for the Localizer? I have a Marker Beacon and
> Transponder antenna. Will I need a separate Glide Slope antenna?
>
> I would like to keep the airframe clean i.e. no antennas hanging
> everywhere. If a separate GS antenna is required can it be mounted
> inside the fiberglass wingtip?
>
> I realize I have posted questions that my require lengthy answers...
>
> This is a great source for aircraft/avionics expertise, and a good one
> it is! Thanks!
>
> Chris Stone
>
> RV-8 - wings
>
> Slowly drying out in Oregon
>
>
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