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luckymacy(at)comcast.net
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 Posted: Wed Oct 03, 2007 8:01 pm Post subject: "scratchy" transmission |
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I noticed Van's is now selling a radio monitor so you can hear you transmission. http://www.vansaircraft.com/cgi-bin/catalog.cgi?ident=1191469174-304-279&browse=new&product=radio-monitor
One of the descriptions says to be able to check for 'scratchy' transmission. Well, 2 flights ago people started to tell me my transmissions were becoming scratchy once the engine is running and the range is short but OK prior to engine start even though the intercom continues to work like a champ all the time and I can still hear others quite well and from a long distance regardless of what else is on or off that I can control with respect to avionics and engine. Anyone have enough hands on experience to know what the most probable causes of that are? I have tried the following with no luck:
changed RG400 cables between TX and Antenna, tried to transmit with different headsets and from both pilot/copilot positions, ensured all the ground connectors FWF and in the avionics area appear to be 'normal', ensured the headset jacks were still snug and no obvious connector problems, and checked the antenna inside the plane and outside the plane. I'd have swapped radios if one was available.
my radio is an XCOM760
[quote][b]
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jetboy
Joined: 22 Jul 2006
Posts: 233
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| Posted: Wed Oct 03, 2007 8:59 pm Post subject: Re: |
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One of the features built into the Xcom is that both mic inputs are live when any ptt is operated.
It causes noisy radio transmissions whenever there is cockpit noise (entering the other mic) usually in flight.
Efforts to have the manufacturer correct this issue are unresolved, so, typically if you have this issue you will need to do a workaround with external wiring or use an alternative radio.
Ralph
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Ralph - CH701 / 2200a |
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luckymacy
Joined: 04 Oct 2007
Posts: 11
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| Posted: Thu Oct 04, 2007 2:04 am Post subject: Re: |
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Wouldn't the fact that it makes no difference whether the second headset is plugged in or not eliminate that source of noise. Further there is an intercom off, intercom isolate and intercom switch so not sure what you mean or if you are completely accurate in your product description.
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john_rv10(at)yahoo.com
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| Posted: Mon Oct 08, 2007 1:02 am Post subject: "scratchy" transmission |
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Hi,
I have just had exactly the same issue with my XCOM 760. I sent my unit back to the factory – excellent service and quick turnaround. There was a solder joint on the board inside that had come adrift.
John Cleary
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of lucky
Sent: Thursday, 4 October 2007 1:56 PM
To: aeroelectric-list(at)matronics.com
Subject: AeroElectric-List: "scratchy" transmission
I noticed Van's is now selling a radio monitor so you can hear you transmission. http://www.vansaircraft.com/cgi-bin/catalog.cgi?ident=1191469174-304-279&browse=new&product=radio-monitor
One of the descriptions says to be able to check for 'scratchy' transmission. Well, 2 flights ago people started to tell me my transmissions were becoming scratchy once the engine is running and the range is short but OK prior to engine start even though the intercom continues to work like a champ all the time and I can still hear others quite well and from a long distance regardless of what else is on or off that I can control with respect to avionics and engine. Anyone have enough hands on experience to know what the most probable causes of that are? I have tried the following with no luck:
changed RG400 cables between TX and Antenna, tried to transmit with different headsets and from both pilot/copilot positions, ensured all the ground connectors FWF and in the avionics area appear to be 'normal', ensured the headset jacks were still snug and no obvious connector problems, and checked the antenna inside the plane and outside the plane. I'd have swapped radios if one was available.
my radio is an XCOM760
| Quote: | | http://www.matronics.com/Navigator?AeroElectric-List |
01234
7/10/2007 6:12 PM
7/10/2007 6:12 PM
[quote][b]
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http://www.matronics.com/Navigator?AeroElectric-List |
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luckymacy
Joined: 04 Oct 2007
Posts: 11
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| Posted: Mon Oct 08, 2007 1:56 am Post subject: "scratchy" transmission |
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Thanks bud, that's exactly the kind of "special insight" I was looking for!
lucky
[quote]-------------- Original message --------------
From: "RV_10" <john_rv10(at)yahoo.com>
v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);}
Hi,<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
I have just had exactly the same issue with my XCOM 760. I sent my unit back to the factory – excellent service and quick turnaround. There was a solder joint on the board inside that had come adrift.
John Cleary
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of lucky
Sent: Thursday, 4 October 2007 1:56 PM
To: aeroelectric-list(at)matronics.com
Subject: "scratchy" transmission
I noticed Van's is now selling a radio monitor so you can hear you transmission. http://www.vansaircraft.com/cgi-bin/catalog.cgi?ident=1191469174-304-279&browse=new&product=radio-monitor
One of the descriptions says to be able to check for 'scratchy' transmission. Well, 2 flights ago people started to tell me my transmissions were becoming scratchy once the engine is running and the range is short but OK prior to engine start even though the intercom continues to work like a champ all the time and I can still hear others quite well and from a long distance regardless of what else is on or off that I can control with respect to avionics and engine. Anyone have enough hands on experience to know what the most probable causes of that are? I have tried the following with no luck:
changed RG400 cables between TX and Antenna, tried to transmit with different headsets and from both pilot/copilot positions, ensured all the ground connectors FWF and in the avionics area appear to be 'normal', ensured the headset jacks were still snug and no obvious connector problems, and checked the antenna inside the plane and outside the plane. I'd have swapped radios if one was available.
my radio is an XCOM760
| Quote: | | http://www.matronics.com/Navigator?AeroElectric-List |
01234
7/10/2007 6:12 PM
7/10/2007 6:12 PM
5[b]
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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