Today's Message Index:
----------------------
1. 04:54 AM - Re: Blue Mountain EFIS (luckymacy@comcast.net (lucky))
2. 08:01 AM - Re: RF Radiation (Ralph Keeping)
3. 10:03 AM - RF Radiation ()
Message 1
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| Subject: | Re: Blue Mountain EFIS |
--> Avionics-List message posted by: luckymacy@comcast.net (lucky)
Maybe none of the above.
check out GRT stuff @ http://www.grtavionics.com/
-------------- Original message --------------
> --> Avionics-List message posted by: "Peter Lythall"
>
> Hello,
>
>
> I have sorted out my engine requirements and am now planning out my panel. I
> have reviewed the Blue Mountain EFIS as well as the Dynon D100. I like the
> size and definition of the BM however, the idea of having a Garmin 430,
> D100, and a separate EIS sounds like it may be a better idea given that
> there are now 3 separate parts as opposed to one. If you have any thoughts
> on this I want to spec my panel for IFR - Canadian. There seems to be some
> difference between the US and CDN side of things. However, Maurice at
> Transport Canada did tell me that according the Canadian Regs we do not
> require TCO instruments in the Experimental type aircraft. Any thoughts or
> reviews would be appreciated.
>
>
> Peter Lythall
>
>
> RV7
>
>
>
>
>
>
Maybe none of the above.
check out GRT stuff @ http://www.grtavionics.com/
-------------- Original message --------------
-- Avionics-List message posted by: "Peter Lythall" <PETER@NORTECH.BC.CA>
Hello,
I have sorted out my engine requirements and am now planning out my panel. I
have reviewed the Blue Mountain EFIS as well as the Dynon D100. I like the
size and definition of the BM however, the idea of having a Garmin 430,
D100, and a separate EIS sounds like it may be a better idea given that
there are now 3 separate parts as opposed to one. If you have any thoughts
on this I want to spec my panel for IFR - Canadian. There seems to be some
difference between the US and CDN side of things. However, Maurice at
Transport Canada did tell me that according the Canadian Regs we do not
require TCO instruments in the Experimental type airc
raft. Any thoughts or
reviews would be appreciated.
Peter Lythall
RV7
=============================================
Message 2
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| Subject: | Re: RF Radiation |
--> Avionics-List message posted by: "Ralph Keeping" <Ralph_Keeping@cbc.ca>
I would defer to an RF authority on this but it seems to me you could do
some filtering on the power supply leads to the affected devices.
Somethng like a ferrite bead on the leads and a bypass capacitor (+ to
ground) of something like a .001uf should shunt any rf to ground. I
can't rember the theory exactly but you should be able to calculate the
best size of capacitor for the vhf comm freqs. In stead of math you also
couldn't hurt anything by just experimenting with different sized caps.
Ralph
>>> j.rippengal@cytanet.com.cy 11/24/05 12:43 AM >>>
--> Avionics-List message posted by: "John Rippengal"
<j.rippengal@cytanet.com.cy>
I would certainly check that the coax connectors at each end of the
feeder
are properly connected. Also check the VSWR at the transmitter end to
ensure
all is well.
John
From: "Paul McAllister" <paul.mcallister@qia.net>
> --> Avionics-List message posted by: "Paul McAllister"
> <paul.mcallister@qia.net>
>
> Hi guys,
>
> I am looking for a few ideas. I have a fiberglass aircraft I am
having
> problems with RF getting into systems and causing problems.
>
> The first area is headsets, I couldn't get my Lightspeeds to work
> properly. Lightspeed acknowledged that there can be problems and
offered
> to modify the battery box. That improved things, but from time to
time I
> still have problems.
>
> The next on the list is my Navaid. Despite following Navaids
suggestion
> of disabling the Navaid whenever the PTT is pressed I still have
issues,
> if I transmit for long enough it will still swing over to a 30 degree
bank
> which is a real pain if I am flying in IFR conditions.
>
> The latest trick is my intercom. Occasionally when I transmit I will
get
> a stuck mike. I called the manufacturer and managed to speak to the
> design engineer. He acknowledged that is there is enough RF present
then
> this could happen. The company are currently working with me to
resolve
> the issue.
>
> So..... does anyone have any ideas. I have a GX60 as my nav / com
and the
> antenna (which is a Bob Archer) is buried in the tail. I have a
single
> point ground on the firewall.
>
> Paul
Message 3
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INNOCENT GLOBAL 0.0000 1.0000 -4.4912
--> Avionics-List message posted by: <bakerocb@cox.net>
Avionics-List message previously posted by: "Paul McAllister"
<paul.mcallister@qia.net>
<<Hi guys, I am looking for a few ideas. I have a fiberglass aircraft I am
having problems
with RF getting into systems and causing problems.
The first area is headsets, I couldn't get my Lightspeeds to work properly.
Lightspeed
acknowledged that there can be problems and offered to modify the battery
box. That improved things, but from time to time I still have problems.
The next on the list is my Navaid. Despite following Navaids suggestion of
disabling
the Navaid whenever the PTT is pressed I still have issues, if I transmit
for long enough it will still swing over to a 30 degree bank which is a real
pain if I am flying in IFR conditions.
The latest trick is my intercom. Occasionally when I transmit I will get a
stuck
mike. I called the manufacturer and managed to speak to the design
engineer.
He acknowledged that is there is enough RF present then this could happen.
The company are currently working with me to resolve the issue.
So..... does anyone have any ideas. I have a GX60 as my nav / com and the
antenna
(which is a Bob Archer) is buried in the tail. I have a single point ground
on the firewall.>>
11/24/2005
Hello Paul, I had an RF interference problem in my KIS TR-1 composite
airplane -- I won't bother you with the details.
My solution was so simple, basic, crude, un analytical and inexpensive that
I am almost embarassed to describe it to you. What I did is just buy a bunch
of split ferrite beads and spread them liberally aroung in various places
and the problem went away.
If you research ferrite split beads on the internet you will find that they
are a staple in the ham radio community and their construction (material)
and other characteristics can be highly technical in nature. I didn't get
too deeply involved in that.
I got my beads from Surplus Sales of Nebraska
http://www.surplussales.com/FerSplit/FerSplit-1.html. Phone: 402-346-4750.
Item number ICH-264-3164251. $2.00 each (the cheapest). I installed them
just by wrapping
them with black plastic tape.
One of these days when I get real curious I will start removing them one by
one to see if the problems come back and to get a better handle on the
source. I
suspect that the problem came from antenna radiations getting into my
systems at certain frequencies.
OC
PS: I don't have much hope for making the Navaid more resistant to RF. It is
a real sieve / sponge. I'll put in a Tru Trak or Trio control unit in some
day.
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