Is Configuration of Com Monitor Audio Required?
Printed From: Avidyne
Category: Avidyne General
Forum Name: IFD 5 Series & IFD 4 Series Touch Screen GPS/NAV/COM
Forum Description: Topics on Avidyne's IFD 5 Series and IFD 4 Series Touch Screen GPS/NAV/COM
URL: http://forums.avidyne.com/forum_posts.asp?TID=983
Printed Date: 12 May 2024 at 3:45pm
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com
Topic: Is Configuration of Com Monitor Audio Required?
Posted By: AzAv8r
Subject: Is Configuration of Com Monitor Audio Required?
Date 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 |
Replies:
Posted By: oskrypuch
Date Posted: 29 Feb 2016 at 11:15pm
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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 |
Posted By: DavidBunin
Date Posted: 01 Mar 2016 at 10:50am
I am not that familiar with the PMA8000, but wouldn't it be the DME button to select the DME input? David Bunin |
I specified connecting to the DME audio inputs, which means the audio should be selected by the "Aux" buttonPosted By: tony
Date Posted: 01 Mar 2016 at 10:59am
| 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. |
Posted By: oskrypuch
Date Posted: 01 Mar 2016 at 11:00am
Wow, that is a very relevant observation!! David's note is exactly correct, and that may be it. * Orest |
Posted By: flybikeski
Date Posted: 01 Mar 2016 at 11:00am
| 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. |
Posted By: Dlesh123
Date Posted: 01 Mar 2016 at 7:55pm
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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. |
Posted By: AzAv8r
Date Posted: 01 Mar 2016 at 9:07pm
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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. |
Posted By: PA20Pacer
Date Posted: 02 Mar 2016 at 8:53am
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 ------------- Bob Siegfried, II Brookeridge Airpark (LL22) Downers Grove, IL |
Posted By: DavidBunin
Date Posted: 02 Mar 2016 at 9:55am
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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 |
Posted By: AzAv8r
Date Posted: 02 Mar 2016 at 7:48pm
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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. |