Author: luckymacy@... Time: Wed Dec 15, 2004 3:37 am PST Link
To round out the email chain on the question of Can you split the GPS signal up and still have the signal reliable. More specifically, can I "hotwire" the GPS signal to two or more devices simultaneously the answer is YES based on the email I got back. I should be able to split the signal and send it to at least 3 different devices and I can switch Autopilot sources using the SPDT ON-ON type micro-switch wired the way I mention below.
Lucky
-------------- Forwarded Message: --------------
From: "Jerry Hansen" <jerry-hansen@cox.net>
To: <luckymacy@comcast.net>
Subject: FW: RV-List: Re: [GRT_EFIS] Re: Autopilot GPS source switch
Date: Mon, 13 Dec 2004 15:10:47 +0000
Hello, Lucky:
(I occasionally lurk on the RV List and just saw these posts)
Our experience with the GPS signals from most GPS receivers is that your
proposed hookup will not appreciably degrade the signal, and it should work
just fine.
Best regards,
Jerry Hansen
Trio Avionics, Inc.
Phone: 619-448-4619
http://www.trioavionics.com
-----Original Message-----
From: owner-rv-list-server@matronics.com
[mailto:owner-rv-list-server@matronics.com] On Behalf Of Stewart, Michael
(ISS Atlanta)
Sent: Monday, December 13, 2004 4:35 AM
To: rv-list@matronics.com
Subject: RE: RV-List: Re: [GRT_EFIS] Re: Autopilot GPS source switch
--> RV-List message posted by: "Stewart, Michael (ISS Atlanta)"
Lucky,
I asked this same ? to John Stark and he said you can split 3 times with
out any concern for appreciable signal degradation on a serial split.
I have had to split on several devices.
Mike
S8 Wiring.
-----Original Message-----
From: owner-rv-list-server@matronics.com
[mailto:owner-rv-list-server@matronics.com] On Behalf Of lucky
To: GRT_EFIS@yahoogroups.com
Subject: RV-List: Re: [GRT_EFIS] Re: Autopilot GPS source switch
--> RV-List message posted by: luckymacy@comcast.net (lucky)
That's only part of the solution, as Sam points out, and why I asked the
question to the list in the first place because I couldn't see the
switch solving the other part of the problem. I want the autopilot to
be driven by two different sources but also wanted the switch to serve
as a "T" for the Lawrence GPS seriel output to drive the GRT all the
time. But I had some coffee and realized that if I tie the GRT's GPS
seriel in line to the same pole that the Lawrence GPS output signal is
connected to then that pole acts as a always hot "T" to allow the GPS
signal to always find it's way to the GRT all the time. That can be
accomplished by putting both systems' wires into the same connector
before crimping (or solder contact before soldering).
Now it's a day later and when I look at this I don't even see the need
for the DP as Paul points out. I think this would work with a SPDT
switch like Paul does.
The main ? now is that if I have the switch in the position where the
Lawrence is feeding both systems the GPS signal out of the same wire and
power source, by splitting it's output what am I going to do to the
signal quality and ultimately reliability? Probably none with these
modern systems and short wire runs and minimal conductor exposure in low
RFI environments.
But anyone know for sure?
-------------- Original message --------------
> Real easy Lucky - a simple DPDT mini toggle switch with the serial
> lines hooked up to teh "outside" contacts and the autopilot serial
> lines connected to the middle poles. (I actually only switched the
> single serial line and not the grounds, as I am using a common signal
> ground for all of the serial lines in the system, so I could have
> gotten by with a SPDT switch - but then again, I'm an aeronautical
> engineer by training, and not a EE...what do I know about electrons?
> LOL...)
>
> Paul Dye
> --- In GRT_EFIS@yahoogroups.com, luckymacy@c... wrote:
> > I don't have my GPS yet (not sure if that actually would help) but
> I want to buy a switch that will let me select between my Lowrance
> GPS and the GRT EFIS output to drive my Trio autopilot and I saw this
> on someone's website. If I have the Lowrance driving the autopilot I
> still want it to also feed the EFIS. Can't find it now.
> >
> > What switch type am I looking to purchase and what's actually going
> to be wired up?
> >
> > Thanks,
> > Lucky
> http://us.click.yahoo.com/Q7_YsB/neXJAA/yQLSAA/jrDrlB/TM
> http://docs.yahoo.com/info/terms/
That's only part of the solution, as Sam points out, and why I asked the
question to the list in the first place because I couldn't see the
switch solving the other part of the problem. I want the autopilot to be
driven by two different sources but alsowanted the switch to serve as a
"T" for the Lawrence GPS seriel output to drive the GRT all the time.But
I had some coffee and realized that if I tie the GRT's GPS seriel in
line to the same pole that the Lawrence GPS output signal isconnectedto
then that pole acts as a always hot"T" to allow the GPS signal to always
find it's way to the GRT all the time.That can be accomplished by
putting both systems'wires into the same connector before crimping (or
solder contact before soldering).
Now it's a day later and when I look at this I don't even see the need
for the DP as Paul points out. I think this would work with a SPDT
switch like Paul does.
The main ? now is that if I have the switch in the position where the
Lawrence is feeding both systems the GPS signal out of the same wire and
power source, by splitting it's output what am I going to do to the
signal quality and ultimately reliability? Probably none with these
modern systems and short wire runs and minimal conductor exposure in
lowRFI environments.
But anyone know for sure?
-------------- Original message --------------
Real easy Lucky - a simple DPDT mini toggle switch with the serial
lines hooked up to teh "outside" contacts and the autopilot serial
lines connected to the middle poles. (I actually only switched the
single serial line and not the grounds, as I am using a common signal
ground for all of the serial lines in the system, so I could have
gotten by with a SPDT switch - but then again, I'm an aeronautical
engineer by training, and not a EE...what do I know about electrons?
LOL...)
Paul Dye
--- In GRT_EFIS@yahoogroups.com, luckymacy@c... wrote:
I don't have my GPS yet (not sure if that actually would help) but
I want to buy a switch that will let me select between my Lowrance
GPS a
nd the GRT EFIS output to drive my Trio autopilot and I saw this
on someone's website. If I have the Lowrance driving the autopilot I
still want it to also feed the EFIS. Can't find it now.
What switch type am I looking to purchase and what's actually going
to be wired up?
Thanks,
Lucky
http://us.click.yahoo.com/Q7_YsB/neXJAA/yQLSAA/jrDrlB/TM
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