Today's Message Index:
----------------------
1. 03:44 AM - Re: GPS antenna removal (Nader)
2. 06:26 AM - Re: GPS antenna removal (Argonaut36)
3. 07:47 AM - Re: Pmag diode (eschlanser)
4. 07:51 AM - Re: Re: GPS antenna removal (Robert L. Nuckolls, III)
5. 11:01 AM - Re: GPS antenna removal (Argonaut36)
6. 11:23 AM - Re: Pmag diode (eschlanser)
7. 05:22 PM - Re: Re: Pmag diode (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: GPS antenna removal |
What GPS antenna will go with, Argonaut36?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=491930#491930
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| Subject: | Re: GPS antenna removal |
The new antenna will be a Garmin GA 35
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=491932#491932
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Bob and all,
After reading the manual on the GRT EIS I conclude that the tach signal should
be 12 volts as you surmised. Should have read that first, but then I wouldnt have
seen the clever way you installed a diode in-line. That was worth the post.
Never in a million years would I have come up with that on my own.
The clip from Emagair that you posted points to other issues and the reason for
a separate thread. And that is how to configure and connect the EIS and the Pmag
for the tach signal. Because the EIS looks for one tach signal per revolution
and the Pmag generates two tach signals per revolution, one systems configuration
will need to be changed. They are both reconfigurable but I dont know
which would be better/easier.
Also confusing is that Pmags note #1 says to collect the tach signal from only
one Pmag unless your system has provision for two separate inputs. The GRT EIS
has only one tach input but two magnetos can be connected to it. Where do you
hook up a second Pmag to a GRT EIS if the instructions to connect are in conflict?
If magneto #1 is working the EIS will read that signal but if magneto #1 is disabled
(as during a mag check), the EIS will read the tach signal of magneto #2.
Pmag note #2 states that a disbabled Pmag will still generate a tach signal
so you wont lose tach during a mag check. Huh? If a disabled Pmag is generating
a signal, how do you not see it? What am I missing?
Thanks,
Eric Schlanser
Tailwind W-10 with dual Pmags
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=491933#491933
Message 4
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| Subject: | Re: GPS antenna removal |
At 08:24 AM 10/23/2019, you wrote:
>
>The new antenna will be a Garmin GA 35
Any chance the old antenna will work just fine
with the new radio? Active GPS antennas tend
to be rather generic and interchangeable
across a broad spectrum of devices that
utilize antennas on the far end of a piece
of coax.
Bob . . .
Message 5
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| Subject: | Re: GPS antenna removal |
Thanks, Bob.
The new antenna is for the Garmin GDL 82 (ADS-B).
I had asked Garmin if my existing antenna would work before purchasing the GDL-82
and they replied that the new GA 35 antenna was absolutely required. Also,
apart from the technical aspects, the GA 35 is the antenna listed in the GDL
82 STC with which I need to comply.
All this is very unfortunate. This morning I found out that the new antenna is
slightly larger than the old one and I will likely need to replace also the saddle
that is glued to the airplane.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=491935#491935
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> The GRT EIS has only one tach input but two magnetos can be connected to it.
>
Correction to above: The GRT EIS does have two tachometer connections.
> Where do you hook up a second Pmag to a GRT EIS if the instructions to connect
are in conflict?
I guess Ill need to get help from GRT and Emagair to understand how the connections
are to be used since each Pmag will be generating a signal even when disabled.
Eric S.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=491936#491936
Message 7
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At 01:22 PM 10/23/2019, you wrote:
<eschlanser@yahoo.com>
>
>
> > The GRT EIS has only one tach input but two
> magnetos can be connected to it.
> >
>
> Correction to above: The GRT EIS does have two tachometer connections.
>
>
> > Where do you hook up a second Pmag to a
> GRT EIS if the instructions to connect are in conflict?
>
>
>I guess I=99ll need to get help from GRT and
>Emagair to understand how the connections are to
>be used since each Pmag will be generating a signal even when disabled.
>
>Eric S.
Just hook up one tach signal. Probability of
loosing that signal is exceedingly low and
even if you did, it's no big deal. Don't mess
the throttle until airport in sight then reduce
power for decent. A tach is about the lowest
priority flight management instrument on the
panel. Broke a tach shaft out in New Mexico
on a trip. I knew that I could never over-speed
the engine in EITHER climb OR cruise at altitude.
So for all practical purposes, the flight from
t/o to approach descent could be made at full
throttle all the way. Brought the airplane home
for repairs in OUR shop.
The eMag ignition outputs a tach signal even
if in IGN OFF condition . . . I'd just hook
up one ign to the tach and call it good.
I've designed a couple of electronic tach
pickoffs for upgrading Beech products to electronic
displays . . . nobody ever worried about the
'single source' driving a 'single instrument'.
Bob . . .
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