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jskiba(at)icosa.net
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 Posted: Sat Feb 02, 2008 11:05 pm Post subject: SL30 nav com radio |
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I have a power question:
The sl30 can accept power either 14v or 28 v
There is also a power input for Nav and com
You CAN power just the nav line and get the nav functions to work.
You get a message on the display that says com failure
However you can NOT power just the com portion as the display is blank.
Question is:
Can you power the com portion with 28 volts and the nav portion with 14 volts at the same time??
I ask since this sl30 will be connected to a DC50 comdat coupler and EX500 which will both be running off a booster which is taking the aircraft normal 14 volt system to 28 to get the ex500 powered along with the dc50.
The DC50 box stress to power the unit from the same breaker as the com radio since transmitting with the dc50 unpowered will cause damage to the unit.
However if I lose the booster I would still like to have the nav portion of the sl30 if possible.
I would think it would work but do not really want to find out the hard way that it does not !!
Thanks
Jeff.
[quote][b]
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nuckolls.bob(at)cox.net
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| Posted: Sun Feb 03, 2008 6:05 am Post subject: SL30 nav com radio |
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At 12:56 AM 2/3/2008 -0600, you wrote:
| Quote: | I have a power question:
|
| Quote: | The sl30 can accept power either 14v or 28 v
There is also a power input for Nav and com
You CAN power just the nav line and get the nav functions to work.
You get a message on the display that says com failure
However you can NOT power just the com portion as the display is blank.
Question is:
Can you power the com portion with 28 volts and the nav portion with 14
volts at the same time??
I ask since this sl30 will be connected to a DC50 comdat coupler and EX500
which will both be running off a booster which is taking the aircraft
normal 14 volt system to 28 to get the ex500 powered along with the dc50.
The DC50 box stress to power the unit from the same breaker as the com
radio since transmitting with the dc50 unpowered will cause damage to the unit.
However if I lose the booster I would still like to have the nav portion
of the sl30 if possible.
I would think it would work but do not really want to find out the hard
way that it does not !!
|
Your marching off into unproven territory. Since
your chosen configuration for power generation
and distribution is not in the bag of tricks for
folks who do this for a living in TC aircraft,
that combination (along with its unique failure
modes) has never (to my knowledge) been explored
for robustness.
Unless someone here on the List has an intimate
working knowledge of this products internal
characteristics and limits, your most reliable
and probably the only accurate source of information
will come from the factory.
I'm a bit confused tho . . . why not run both
sides from 14V if that's the ship's main source?
I've looked over a few marketing blurbs for this
suite of equipments and it's not obvious to me
why the nav/com cannot be operated totally
from the 14 system.
Bob. . .
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rampil
Joined: 04 May 2007
Posts: 870
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| Posted: Sun Feb 03, 2008 6:36 am Post subject: Re: SL30 nav com radio |
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The data output from the SL-30 will be to standard spec regardless
of whether it is run from 14 or 28. It will be understood by any other
box, even one running 400 cycle 3 phase. I would think it a very bad
idea to have half the SL-30 on 14 and the other half on 28.
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flagstone(at)cox.net
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| Posted: Sun Feb 03, 2008 6:45 am Post subject: SL30 nav com radio |
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Jeff:
I can't answer your question but if you call Garmin at 800.525.6726 x3991, you should get to the AT install/service techs at Garmin. These are the guys that came over from Apollo when Garmin bought them. Terry, or John there could answer your question, and if they don't know they will get hold of the engineers and get the question answered for you. If you don't get them on that number call 888.442.7646, follow the prompts until you get the Garmin tech-reps and ask them to put you thru to the AT guys. I've just spent the last week with them on a complicated SL30 install and found them to be very knowledgeable and helpful.
Mark
[quote] ---
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jskiba(at)icosa.net
Guest
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| Posted: Sun Feb 03, 2008 8:51 am Post subject: SL30 nav com radio |
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| Quote: | I have a power question:
|
| Quote: | The sl30 can accept power either 14v or 28 v
There is also a power input for Nav and com
You CAN power just the nav line and get the nav functions to work.
You get a message on the display that says com failure
However you can NOT power just the com portion as the display is blank.
Question is:
Can you power the com portion with 28 volts and the nav portion with 14
volts at the same time??
I ask since this sl30 will be connected to a DC50 comdat coupler and EX500
which will both be running off a booster which is taking the aircraft
normal 14 volt system to 28 to get the ex500 powered along with the dc50.
The DC50 box stress to power the unit from the same breaker as the com
radio since transmitting with the dc50 unpowered will cause damage to the
unit.
|
| Quote: |
However if I lose the booster I would still like to have the nav portion
of the sl30 if possible.
I would think it would work but do not really want to find out the hard
way that it does not !!
|
I'm a bit confused tho . . . why not run both
sides from 14V if that's the ship's main source?
I've looked over a few marketing blurbs for this
suite of equipments and it's not obvious to me
why the nav/com cannot be operated totally
from the 14 system.
Bob. . .
The #1 reason I want to run 2 voltages is that if the DC50 data coupler
device for the AVidyne ex500 (they share one VHF antenna) looses power it
states it will be Damaged if the com radio (sl30) tries to transmit without
the DC50 powered.
Hence run the sl30 com portion from the same power booster that runs the
DC50 (per dc50 install manual), so that if the dc50 looses power the SL30
also does hence protecting any damage to the DC50.
I will try to call the AT guys at Garmin latter this week to see if the sl30
can be powered in this fashion safely
(thanks for the tip Mark)
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mprather(at)spro.net
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| Posted: Sun Feb 03, 2008 10:07 am Post subject: SL30 nav com radio |
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It would be relatively easy to setup a relay to provide power to the SL30.
The 28V bus provides the control signal for the relay - driving the coil.
The relay switching the 14V feed to the COM. If 28V power is lost, the
relay opens, disabling the COM portion of the radio.
Since COM functionality isn't really a safety of flight issue, I wouldn't
be concerned about the added parts count associated with having an extra
relay in the circuit.
You could also (instead) use 28V to control a relay in line with the PTT
circuit on the COM portion of the radio. Drive the power input to the COM
portion straight through with 14V. Then even after loss of 28V power you
could still safely receive on the COM - the transmitter would be disabled
- possibly useful.
Matt-
| Quote: |
<jskiba(at)icosa.net>
>I have a power question:
>The sl30 can accept power either 14v or 28 v
>
>There is also a power input for Nav and com
>
>You CAN power just the nav line and get the nav functions to work.
>
>You get a message on the display that says com failure
>However you can NOT power just the com portion as the display is blank.
>
>Question is:
>
>Can you power the com portion with 28 volts and the nav portion with 14
>volts at the same time??
>
>I ask since this sl30 will be connected to a DC50 comdat coupler and
> EX500
>which will both be running off a booster which is taking the aircraft
>normal 14 volt system to 28 to get the ex500 powered along with the dc50.
>
>The DC50 box stress to power the unit from the same breaker as the com
>radio since transmitting with the dc50 unpowered will cause damage to the
unit.
>
>However if I lose the booster I would still like to have the nav portion
>of the sl30 if possible.
>
>I would think it would work but do not really want to find out the hard
>way that it does not !!
I'm a bit confused tho . . . why not run both
sides from 14V if that's the ship's main source?
I've looked over a few marketing blurbs for this
suite of equipments and it's not obvious to me
why the nav/com cannot be operated totally
from the 14 system.
Bob. . .
The #1 reason I want to run 2 voltages is that if the DC50 data coupler
device for the AVidyne ex500 (they share one VHF antenna) looses power it
states it will be Damaged if the com radio (sl30) tries to transmit
without
the DC50 powered.
Hence run the sl30 com portion from the same power booster that runs the
DC50 (per dc50 install manual), so that if the dc50 looses power the SL30
also does hence protecting any damage to the DC50.
I will try to call the AT guys at Garmin latter this week to see if the
sl30
can be powered in this fashion safely
(thanks for the tip Mark)
|
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nuckolls.bob(at)cox.net
Guest
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| Posted: Mon Feb 04, 2008 5:48 am Post subject: SL30 nav com radio |
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At 11:01 AM 2/3/2008 -0700, you wrote:
| Quote: |
It would be relatively easy to setup a relay to provide power to the SL30.
The 28V bus provides the control signal for the relay - driving the coil.
The relay switching the 14V feed to the COM. If 28V power is lost, the
relay opens, disabling the COM portion of the radio.
Since COM functionality isn't really a safety of flight issue, I wouldn't
be concerned about the added parts count associated with having an extra
relay in the circuit.
You could also (instead) use 28V to control a relay in line with the PTT
circuit on the COM portion of the radio. Drive the power input to the COM
portion straight through with 14V. Then even after loss of 28V power you
could still safely receive on the COM - the transmitter would be disabled
- possibly useful.
Matt-
|
Good thinking!
Bob . . .
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jskiba(at)icosa.net
Guest
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| Posted: Tue Feb 05, 2008 7:27 am Post subject: SL30 nav com radio |
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| Quote: |
It would be relatively easy to setup a relay to provide power to the SL30.
The 28V bus provides the control signal for the relay - driving the coil.
The relay switching the 14V feed to the COM. If 28V power is lost, the
relay opens, disabling the COM portion of the radio.
Since COM functionality isn't really a safety of flight issue, I wouldn't
be concerned about the added parts count associated with having an extra
relay in the circuit.
You could also (instead) use 28V to control a relay in line with the PTT
circuit on the COM portion of the radio. Drive the power input to the COM
portion straight through with 14V. Then even after loss of 28V power you
could still safely receive on the COM - the transmitter would be disabled
- possibly useful.
Matt-
|
Good thinking!
Bob . . .
Well, I got a hold of the AT guys at garmin per Matt's info (thanks again
Matt)
They advised that you CAN NOT power the com and nav sides from different
voltages, if you do you radio will let out all the "magic smoke" and no
longer function.
So I will be doing something like the above to safe guard the DC50 box.
Thanks again to all.
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mlas(at)cox.net
Guest
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| Posted: Wed Feb 06, 2008 7:59 am Post subject: SL30 nav com radio |
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I would think that using two antennas would be a much easier solution
plus you won't have to deal with the antenna switcher that will
certainly fail (5 failures to date on 5 different airplanes). Pulse it
is much less expensive then the switcher arrangement.
Mike
--
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