Today's Message Index:
----------------------
1. 05:37 AM - Need Comm Troubleshooting Advice (Roger Roy)
2. 07:32 AM - Re: Need Comm Troubleshooting Advice (John Rippengal)
3. 08:09 AM - Re: Need Comm Troubleshooting Advice (Roger Roy)
4. 08:39 PM - Re: Need Comm Troubleshooting Advice (Noel Loveys)
Message 1
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| Subject: | Need Comm Troubleshooting Advice |
The aircraft in question is a Grumman American AA-1B Trainer. I have
recently upgraded my avionics which consists of a PM501 Intercom,
King/Bendix KY-134 Audio Panel, KX-125 Comm Nav, KY-96A Comm and a
KT-76A Transponder with an Encoder. New Comm antennae and coax were
also added and had a harness made and tested by a reputable Avionics
shop.
Aircraft engine not running, Battery power at 12V. The units powers up
fine but both Comms are broken and weak in the transmit mode but receive
OK but very weak, volume set at max. I'm leaning toward antenna/cable
problems, but any other ideas that steer me in the right direction would
be appreciated. The aircraft is not flyable at this time so getting it
to a repair shop is not an option, thank.
RJ
Message 2
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| Subject: | Re: Need Comm Troubleshooting Advice |
Roger,
What are the battery volts when you switch the equipment on?? The fault
is common to both comms so suspect something common like the battery.
You should check the equipment with the battery on charge and a battery
voltage of about 14v WITH the equipment switched on.
John
The aircraft in question is a Grumman American AA-1B Trainer. I have
recently upgraded my avionics which consists of a PM501 Intercom,
King/Bendix KY-134 Audio Panel, KX-125 Comm Nav, KY-96A Comm and a
KT-76A Transponder with an Encoder. New Comm antennae and coax were
also added and had a harness made and tested by a reputable Avionics
shop.
Aircraft engine not running, Battery power at 12V. The units powers up
fine but both Comms are broken and weak in the transmit mode but receive
OK but very weak, volume set at max. I'm leaning toward antenna/cable
problems, but any other ideas that steer me in the right direction would
be appreciated. The aircraft is not flyable at this time so getting it
to a repair shop is not an option, thank.
RJ
Message 3
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| Subject: | Re: Need Comm Troubleshooting Advice |
Hi John,
You might have hit the nail on the head. When I initially powered up I
had just slightly over 12 volts and after 30 min of fooling around
trouble shooting I had about 10 volts when power down. I'll give your
recommendation a try Wednesday when I'll be back troubleshootng the
system, I'll let you know how it all turns out, thanks again for your
help
RJ
----- Original Message -----
From: John Rippengal<mailto:j.rippengal@cytanet.com.cy>
To: avionics-list@matronics.com<mailto:avionics-list@matronics.com>
Sent: Monday, July 02, 2007 10:31 AM
Subject: Re: Avionics-List: Need Comm Troubleshooting Advice
Roger,
What are the battery volts when you switch the equipment on?? The
fault is common to both comms so suspect something common like the
battery. You should check the equipment with the battery on charge and a
battery voltage of about 14v with the equipment switched on.
John
The aircraft in question is a Grumman American AA-1B Trainer. I have
recently upgraded my avionics which consists of a PM501 Intercom,
King/Bendix KY-134 Audio Panel, KX-125 Comm Nav, KY-96A Comm and a
KT-76A Transponder with an Encoder. New Comm antennae and coax were
also added and had a harness made and tested by a reputable Avionics
shop.
Aircraft engine not running, Battery power at 12V. The units powers
up fine but both Comms are broken and weak in the transmit mode but
receive OK but very weak, volume set at max. I'm leaning toward
antenna/cable problems, but any other ideas that steer me in the right
direction would be appreciated. The aircraft is not flyable at this time
so getting it to a repair shop is not an option, thank.
RJ
http://www.matronics.com/Navigator?Avionics-List<http://www.matronics.com
/Navigator?Avionics-List>
Message 4
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| Subject: | Need Comm Troubleshooting Advice |
If you have a Ham radio operator, especially one who specializes in two
meter VHF in your area he/she should be able to test your antenna system
with a special machine called a Bird Watt meter. I doubt anyone who
happens
to have one of these beauties would lend it out but they may be more
than
happy to check out your antenna systems and check out the power output
of
your transceivers.
Another place you could try would be your local telco... If VHF
telephone is
still available in your area.
Noel
-----Original Message-----
From: owner-avionics-list-server@matronics.com
[mailto:owner-avionics-list-server@matronics.com] On Behalf Of Roger Roy
Sent: Monday, July 02, 2007 10:06 AM
Subject: Avionics-List: Need Comm Troubleshooting Advice
The aircraft in question is a Grumman American AA-1B Trainer. I have
recently upgraded my avionics which consists of a PM501 Intercom,
King/Bendix KY-134 Audio Panel, KX-125 Comm Nav, KY-96A Comm and a
KT-76A
Transponder with an Encoder. New Comm antennae and coax were also added
and
had a harness made and tested by a reputable Avionics shop.
Aircraft engine not running, Battery power at 12V. The units powers up
fine
but both Comms are broken and weak in the transmit mode but receive OK
but
very weak, volume set at max. I'm leaning toward antenna/cable
problems,
but any other ideas that steer me in the right direction would be
appreciated. The aircraft is not flyable at this time so getting it to a
repair shop is not an option, thank.
RJ
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