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1. 01:30 PM - Re: Aera 660 Bare Wire Cradle Question (farmrjohn)
2. 02:42 PM - Re: Re: Aera 660 Bare Wire Cradle Question (Chuck Birdsall)
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| Subject: | Re: Aera 660 Bare Wire Cradle Question |
Some confusion on wiring the RS-232 signal to the ELT has cropped up. There is
no power out provision from the 660 cradle to provide power to the ELT which
ACK requires (protected by 1 amp fuse/cb). The ACK Installation Advisory has
the following:
"NOTE: 22 or 24 gage M27500 shielded 3 conductor cable or M22759 individual wires
should be used for the cable assembly if using individual wires the RS 232
data line from the GPS should be shielded and grounded at both ends."
but the current installation manual, dated 6 months later, states:
"A three conductor shielded cable 24 AWG or heaver,
(Aircraft Spruce P/N 11-04478 or equivalent) should be used to connect the ELT
RS 232 data and power to the aircraft systems3.) Connect one conductor to pin
3 (Fig. 12.1) and connect to aircraft ground at the cockpit. connect the outer
shield to ground, at the cockpit end only."
If using individual wires, should the shield be grounded at both ends or just at
the aircraft ground as if using the three conductor cable? Also, if using the
three conductor cable, what would be the best way to separate the 232 data
wire from the power and ground wires? They will not be connecting at the same
place since the power source is not coming via the 660 cradle harness.
Sorry for the NOOB questions.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=489559#489559
Message 2
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| Subject: | Re: Aera 660 Bare Wire Cradle Question |
Running power through a multi-conductor cable (M27500) simplifies a retrofit installation
in that only the control cable and the power/data wire need to be run
the length of the aircraft. Since thats a big part of their market, thats probably
why its drawn that way. I simply splice the power wire in at the same
point the data line is spliced in. How you do this is up to you (solder joint,
butt splice, small connector, etc.).
A single conductor shielded wire for the data and a separate unshielded wire for
power would work fine if that works better for the way you need/want to run
the wires. In an all-metal aircraft I see no benefit to returning the ground back
to the start point like what is in their drawing. A local ground near the
data connector would be sufficient.
My general rule of thumb for data lines is to ground the shield at both ends. That
seems to be standard practice in just about every install manual of recent
vintage.
Have fun soldering that mini DIN connector - its very easy to overheat the pins
and melt the plastic housing. Use a heat sink on the pin (locate it next to the
housing), get on, solder, get off quickly.
Chuck
On Jun 9, 2019, at 3:29 PM, farmrjohn <faithvineyard@yahoo.com> wrote:
Some confusion on wiring the RS-232 signal to the ELT has cropped up. There is
no power out provision from the 660 cradle to provide power to the ELT which
ACK requires (protected by 1 amp fuse/cb). The ACK Installation Advisory has
the following:
"NOTE: 22 or 24 gage M27500 shielded 3 conductor cable or M22759 individual wires
should be used for the cable assembly if using individual wires the RS 232
data line from the GPS should be shielded and grounded at both ends."
but the current installation manual, dated 6 months later, states:
"A three conductor shielded cable 24 AWG or heaver,
(Aircraft Spruce P/N 11-04478 or equivalent) should be used to connect the ELT
RS 232 data and power to the aircraft systems3.) Connect one conductor to pin
3 (Fig. 12.1) and connect to aircraft ground at the cockpit. connect the outer
shield to ground, at the cockpit end only."
If using individual wires, should the shield be grounded at both ends or just at
the aircraft ground as if using the three conductor cable? Also, if using the
three conductor cable, what would be the best way to separate the 232 data
wire from the power and ground wires? They will not be connecting at the same
place since the power source is not coming via the 660 cradle harness.
Sorry for the NOOB questions.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=489559#489559
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