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mrspudandcompany(at)veriz
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 Posted: Sat Dec 15, 2012 9:09 am Post subject: SL30 intercom function |
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The SL30 has a voice activated intercom function. Can this intercom be used
in conjunction with an audio isolation amplifier as the system intercom? I
don't see any way of putting the output of the isolation amp into the
intercom. Is this doable, or is it more of a pain in the lower posterior
than it is worth.
Thanks for your thoughts and observations.
Roger
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nuckolls.bob(at)aeroelect
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| Posted: Sat Dec 15, 2012 9:49 am Post subject: SL30 intercom function |
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At 11:08 AM 12/15/2012, you wrote:
| Quote: |
<mrspudandcompany(at)verizon.net>
The SL30 has a voice activated intercom function. Can this intercom be used
in conjunction with an audio isolation amplifier as the system intercom? I
don't see any way of putting the output of the isolation amp into the
intercom. Is this doable, or is it more of a pain in the lower posterior
than it is worth.
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Don't know why not. Wire the ship's microphones as depicted
in figure 7 of the manual. Route Nav and Comm audio to the
isolation amplifier along with any other audio sources that
you want to add to the mix. The SL30 integral intercomm
with vox will continue to function as before except that
any other audio sources will be imposed on top of audio
normally heard only from the SL30
Bob . . .
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mrspudandcompany(at)veriz
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| Posted: Sat Dec 15, 2012 12:39 pm Post subject: SL30 intercom function |
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| Quote: |
The SL30 has a voice activated intercom function. Can this intercom be
used
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| Quote: | in conjunction with an audio isolation amplifier as the system intercom? I
don't see any way of putting the output of the isolation amp into the
intercom. Is this doable, or is it more of a pain in the lower posterior
than it is worth.
|
Don't know why not. Wire the ship's microphones as depicted
in figure 7 of the manual. Route Nav and Comm audio to the
isolation amplifier along with any other audio sources that
you want to add to the mix. The SL30 integral intercomm
with vox will continue to function as before except that
any other audio sources will be imposed on top of audio
normally heard only from the SL30
Lets see if I have this sorted out correctly. The mics are connected per
Fig 7 and, the Pin 13 & 14 outputs go into the Isolation amp, and the
headphones are then connected to the isolation amp output.
I will have to weigh my options for a separate intercom.
Do you know if the intercom input can be on (grounded) continuously, even
during txm?
Roger
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sprocket(at)vx-aviation.c
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| Posted: Sat Dec 15, 2012 1:41 pm Post subject: SL30 intercom function |
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You could use the AMX-2A mixer from MakerPlane:
http://makerplane.myshopify.com/collections/avionics/products/10-channel-audio-mixer-mono-amx-2a
This device has a special mode that connects directly to the SL-30 Comm,
thus providing a fail-safe interface. The mixer can fail and the Comm audio
will continue.
The mixer provides 10 inputs, four with variable level and is housed in a
DB-25 backshell.
Available as a pcb, kit or finished product.
Cheers, Vern
--
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nuckolls.bob(at)aeroelect
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| Posted: Sat Dec 15, 2012 2:31 pm Post subject: SL30 intercom function |
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| Quote: |
Do you know if the intercom input can be on (grounded) continuously, even
during txm?
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I think it can
Bob . . .
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user9253
Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
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| Posted: Sun Dec 16, 2012 7:15 am Post subject: Re: SL30 intercom function |
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Looking at the schematic for the AMX-4A/4B referenced above.
http://107.22.231.30/redmine/attachments/download/58/Schematic-AMX-4A.pdf
I do not understand the resistor value 180R *100K.
The first thought that comes to mind is 180K ohm. But if you multiply 180 ohms by 100,000, it comes to 18,000,000, which seems too big.
I understand other resistor values on the schematic. For instance, 1M6 is 1.6M ohms. And 560R is 560 ohms. But 180R *100K and 1K0 *150R have me confused.
Joe Gores
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Joe Gores |
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mrspudandcompany(at)veriz
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| Posted: Sun Dec 16, 2012 7:29 am Post subject: SL30 intercom function |
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| Quote: | Do you know if the intercom input can be on (grounded) continuously, even
during txm?
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I think it can
Thanks Bob
Roger
Do not Archive
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ceengland7(at)gmail.com
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| Posted: Sun Dec 16, 2012 8:05 am Post subject: SL30 intercom function |
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On 12/16/2012 09:15 AM, user9253 wrote:
| Quote: |
Looking at the schematic for the AMX-4A/4B referenced above.
http://107.22.231.30/redmine/attachments/download/58/Schematic-AMX-4A.pdf
I do not understand the resistor value 180R *100K.
The first thought that comes to mind is 180K ohm. But if you multiply 180 ohms by 100,000, it comes to 18,000,000, which seems too big.
I understand other resistor values on the schematic. For instance, 1M6 is 1.6M ohms. And 560R is 560 ohms. But 180R *100K and 1K0 *150R have me confused.
Joe Gores
--------
Joe Gores
Only a quick look at it, but I think that he's showing two optional
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values for a set of resistors. One set of values is for 'normal' output
(AMX-4A) & the other, asterisk labeled, is for high output (AMX-4B).
The 'normal' output resistor set is actually an attenuator.
Charlie
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user9253
Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
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| Posted: Sun Dec 16, 2012 12:02 pm Post subject: Re: SL30 intercom function |
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Thanks Charlie,
If I would have looked closer, I would have realized that was an asterisk referring to a note, not a multiplication sign. 
Joe
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