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mike>bentley
Joined: 10 Oct 2011
Posts: 17
Location: United States
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 Posted: Sun Aug 18, 2013 8:38 am Post subject: Broadcast Radio Bleedover on Transceiver |
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Looking for some advice. I have a Kitfox IV using an Icom A5 transceiver mounted on the panel. It has the ni-cad batter installed as well as connected to the ships power. It is connected to a Comant CI-122 antenna via RG400 cable. When I am in the vicinity of broadcast radio antennas or at a lower altitude over a city with broadcast antennas, I get a constant, fairly loud garbeled bleedover from their broadcast. Adjusting squelch doesn't help much. I can still transmit and receive ATC ok as it blanks out the bleedover.
Any suggestions or topics that have already discussed this?
Thanks
Mike
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_________________
Mike Bentley
Joplin, MO
N5498B
Kitfox Model 4-1200
Jabiru 2200 #438
Rotec Aerosport LCH Heads
Prince Prop (64 x 34)
Ellison EFS-2 Throttle Body |
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enginerdy(at)gmail.com
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| Posted: Sun Aug 18, 2013 8:58 am Post subject: Broadcast Radio Bleedover on Transceiver |
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Do you have an intercom too, or just the radio?
--Daniel
On Aug 18, 2013, at 11:38 AM, "mike>bentley" <mikeeeb(at)gmail.com> wrote:
| Quote: |
Looking for some advice. I have a Kitfox IV using an Icom A5 transceiver mounted on the panel. It has the ni-cad batter installed as well as connected to the ships power. It is connected to a Comant CI-122 antenna via RG400 cable. When I am in the vicinity of broadcast radio antennas or at a lower altitude over a city with broadcast antennas, I get a constant, fairly loud garbeled bleedover from their broadcast. Adjusting squelch doesn't help much. I can still transmit and receive ATC ok as it blanks out the bleedover.
Any suggestions or topics that have already discussed this?
Thanks
Mike
--------
Mike Bentley
Joplin, MO
N5498B
Model 4-1200 (Flying)
Jabiru 2200
Rotec Aerosport LCH Heads
GT Prop
Ellison EFS-2 Throttle Body
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=406965#406965
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mike>bentley
Joined: 10 Oct 2011
Posts: 17
Location: United States
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| Posted: Sun Aug 18, 2013 9:07 am Post subject: Re: Broadcast Radio Bleedover on Transceiver |
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Yes. It runs through a Sigtronics SPO-22N intercom.
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_________________
Mike Bentley
Joplin, MO
N5498B
Kitfox Model 4-1200
Jabiru 2200 #438
Rotec Aerosport LCH Heads
Prince Prop (64 x 34)
Ellison EFS-2 Throttle Body |
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enginerdy(at)gmail.com
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| Posted: Sun Aug 18, 2013 9:29 am Post subject: Broadcast Radio Bleedover on Transceiver |
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Have you experimented with that setup to see if the noise is possibly coming in through the intercom?
Daniel
On Aug 18, 2013, at 12:07 PM, "mike>bentley" <mikeeeb(at)gmail.com> wrote:
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mike>bentley
Joined: 10 Oct 2011
Posts: 17
Location: United States
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| Posted: Sun Aug 18, 2013 10:03 am Post subject: Re: Broadcast Radio Bleedover on Transceiver |
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I have not. I'll try it. I'll disconnect the intercom and hook up the headset straight out of the radio.
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_________________
Mike Bentley
Joplin, MO
N5498B
Kitfox Model 4-1200
Jabiru 2200 #438
Rotec Aerosport LCH Heads
Prince Prop (64 x 34)
Ellison EFS-2 Throttle Body |
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Martymason
Joined: 17 Apr 2009
Posts: 20
Location: Norcross, GA
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| Posted: Mon Aug 19, 2013 7:54 am Post subject: Re: Broadcast Radio Bleedover on Transceiver |
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Mike,
Your VHF transceiver is amplitude modulated. AM radio is of course amplitude modulated. Broadcast AM stations transmit at 250 to 50,000 watts. Your receiver will detect signals in the low milliwatts. In early days of commercial radio a diode and earphone was all many people used to get reception.
That said, look for the interference getting in your earphones through a corroded connection. It can be in a ground or power or signal connection. The corrosion doesn't have to be obvious. Just dissimilar. The intercom might be another entry point. Perhaps a connection from another audio input.
Hope this helps.
Marty
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mike>bentley
Joined: 10 Oct 2011
Posts: 17
Location: United States
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| Posted: Mon Aug 19, 2013 11:37 am Post subject: Re: Broadcast Radio Bleedover on Transceiver |
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I'll have to check all that out when I get back from this trip. Thanks for the input everyone. I'll let you know what happens.
| | - 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:
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_________________
Mike Bentley
Joplin, MO
N5498B
Kitfox Model 4-1200
Jabiru 2200 #438
Rotec Aerosport LCH Heads
Prince Prop (64 x 34)
Ellison EFS-2 Throttle Body |
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mike>bentley
Joined: 10 Oct 2011
Posts: 17
Location: United States
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| Posted: Mon Sep 02, 2013 12:18 pm Post subject: Re: Broadcast Radio Bleedover on Transceiver |
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Seems to be coming through from the headsets. It's not near as bad when I disconnect the co pilots headset. I wonder if an external ground to the intercom box would help.
| | - 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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_________________
Mike Bentley
Joplin, MO
N5498B
Kitfox Model 4-1200
Jabiru 2200 #438
Rotec Aerosport LCH Heads
Prince Prop (64 x 34)
Ellison EFS-2 Throttle Body |
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