Is Configuration of Com Monitor Audio Required? |
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AzAv8r
Senior Member Joined: 06 Dec 2011 Location: Arizona Status: Offline Points: 154 |
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Posted: 29 Feb 2016 at 9:32pm |
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I had my avionics shop add the Comm Monitor lines from the IFD540 to my PS Engineering PMA8000. I specified connecting to the DME audio inputs, which means the audio should be selected by the "Aux" button, and which also matches the wiring of the special "Avidyne" version of the PMA8000.
Alas, it does not work. My test was simply to tune the local ATIS, and confirming I could hear it with ATIS as the Selected Comm frequency, swap the frequency with the Aux input selected. No audio. On the Sys->Audio screen, the Monitor audio is mid-range (and I tried increasing it, to no avail.) I also had them add the wiring of Alerts (to the "ADF" button, "A" for "Alert" ), and that function does seem to work. Today I talked to Avidyne support, and they confirmed that the HW mod to support the "Monitor" audio was performed when I shipped it back for SB work in May or June of last year. So... Is there any configuration item on either the Sys or Maintenance screens besides the volume for the Comm Monitor function? I didn't find anything in either the Pilot's Guide or Installation Manual, but my search could certainly be inadequate. Tech Support was ambivalent beyond "the standby block should show that your are receiving", something I can readily check, and will. I'm going to meet with the installer at the airport tomorrow, and it would be good to have available any additional knowledge. They've confirmed the wiring with an Ohmmeter (IFD pins to PMA pins; I'll ask tomorrow if they confirmed the Hi pins weren't also shorted to ground.) Thanks in advance! Jon |
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oskrypuch
Senior Member Joined: 09 Nov 2012 Location: CYFD Status: Offline Points: 3061 |
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Yes, double check that the Standby block shows the RCV label.
Only other thing I can think of is that only the first physical Standby block will monitor, regardless of which Standby block is "active" with the cyan rectangle. With the mod in, and the wires connected, it should work. * Orest |
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DavidBunin
Senior Member Joined: 20 May 2015 Location: Rockwall, TX Status: Offline Points: 742 |
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I am not that familiar with the PMA8000, but wouldn't it be the DME button to select the DME input? David Bunin |
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tony
Senior Member Joined: 06 Dec 2011 Location: Atlanta Status: Offline Points: 466 |
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If I was your avionics shop, I wouldn't honor your request for a couple of reasons. 1. There is no approved engineering to support that request, and 2. The button is now mislabeled in your aircraft.
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oskrypuch
Senior Member Joined: 09 Nov 2012 Location: CYFD Status: Offline Points: 3061 |
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Wow, that is a very relevant observation!! David's note is exactly correct, and that may be it. * Orest Edited by oskrypuch - 01 Mar 2016 at 11:01am |
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flybikeski
Groupie Joined: 26 Feb 2015 Location: Placerville Status: Offline Points: 68 |
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Just FYI, I connected my standby monitoring to a PMA7000B COM3 input and it works. On mine, AUX and DME are similar and are simple inputs. Press Aux to hear what is tied to the AUX inputs and press DME to listen to what was wired to the DME inputs.
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Dlesh123
Newbie Joined: 13 Mar 2015 Location: Fountain Status: Offline Points: 30 |
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We wired our standby freq monitor to the former ADF button ( and relabeled it) on our PMA 8000bt. We still have a DME and is wired separately.
I Also remember reading that only the second freq box can be used for the monitor function. Edited by Dlesh123 - 01 Mar 2016 at 7:56pm |
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AzAv8r
Senior Member Joined: 06 Dec 2011 Location: Arizona Status: Offline Points: 154 |
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The PMA8000BT "Installation and Operators Manual" states in numerous places, including both in the Operations section and on the interconnect diagram:
"DME audio is passed when AUX button is pressed." That is in addition to "Aux" audio. Eg, the two inputs on the back are not differentiable on the front. Go figure. Now, the manual might be wrong, but there certainly is no other mechanism obvious for the Operator (that would be me) to select the source connected to the DME input. |
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PA20Pacer
Senior Member Joined: 07 Mar 2012 Location: Illinois (LL22) Status: Offline Points: 161 |
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AzAv8r is entirely correct with regards to the functioning of the PMA8000B series of audio panels. Both the DME and AUX inputs are switched on by the AUX panel switch. I have my IFD540 alerts wired to the DME input and my Trimble audio alerts wired to the AUX input. I keep the Trimble alerts turned down, as they tend to be more distracting than useful. Regards, Bob
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Bob Siegfried, II
Brookeridge Airpark (LL22) Downers Grove, IL |
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DavidBunin
Senior Member Joined: 20 May 2015 Location: Rockwall, TX Status: Offline Points: 742 |
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My PMA450 has the ability to adjust the volume of the switched inputs (one adjustment for all three switched inputs). Is there a similar adjustment on the 8000? In other words could it be a volume problem within the audio panel?
David Bunin |
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AzAv8r
Senior Member Joined: 06 Dec 2011 Location: Arizona Status: Offline Points: 154 |
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I did not find any mention of such in the PS Engineering manual. One of the unswitched inputs has a volume adjust, but it's an installation-time control, accessed through the bottom of the unit.
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