---------------------------------------------------------- Avionics-List Digest Archive --- Total Messages Posted Mon 07/02/07: 4 ---------------------------------------------------------- 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 _____________________________________ Time: 05:37:10 AM PST US From: "Roger Roy" 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 ________________________________ Message 2 _____________________________________ Time: 07:32:35 AM PST US From: "John Rippengal" 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 ________________________________ Message 3 _____________________________________ Time: 08:09:35 AM PST US From: "Roger Roy" Subject: Re: Avionics-List: 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 To: 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 ________________________________ Message 4 _____________________________________ Time: 08:39:11 PM PST US From: "Noel Loveys" Subject: RE: Avionics-List: 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. 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