Today's Message Index:
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1. 11:03 AM - Re: Need Comm Troubleshooting Advice (Roger Roy)
2. 11:06 AM - Re: Need Comm Troubleshooting Advice (Roger Roy)
3. 12:01 PM - Re: Need Comm Troubleshooting Advice (John Rippengal)
4. 01:08 PM - Re: Need Comm Troubleshooting Advice (Roger Roy)
5. 02:51 PM - Crossbow NAV425EX Service Bulletin (Mike@Crossbow)
Message 1
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| Subject: | Re: Need Comm Troubleshooting Advice |
MessageHi Noel,
Hey, thanks for the reply but as of an hour ago the problem was solved.
Low battery voltage was the culprit in this case. The low TX and RX
volumes is because when your in a steel hangar radios don't seem to work
well. Again thank you
RJ----- Original Message -----
From: Noel Loveys<mailto:noelloveys@yahoo.ca>
To: avionics-list@matronics.com<mailto:avionics-list@matronics.com>
Sent: Monday, July 02, 2007 11:37 PM
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
To: avionics-list@matronics.com
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
href="http://www.matronics.com/Navigator?Avionics-List">http://www.matr
onics.com/Navigator?Avionics-List
href="http://forums.matronics.com">http://forums.matronics.com
http://www.matronics.com/Navigator?Avionics-List<http://www.matronics.com
/Navigator?Avionics-List>
Message 2
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| Subject: | Re: Need Comm Troubleshooting Advice |
Hi John,
How's the avionics guru? I did as you suggested and put my battery
charger on the battery and all seem to workload and clear. I was unable
to had another person TX with the portable I will check this out
tomorrow, again thank you, Cheers
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 3
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| Subject: | Re: Need Comm Troubleshooting Advice |
Glad it seems to be ok now Roger. An aircraft standing around for quite
a time while a new avionics pack is being fitted is a good clue to there
being a flat battery. However the other advice given to you to check
with a VSWR meter is a good one. The Bird Thru' Line meter is a sort of
Rolls Royce professional type and you really don't need that for a good
check on your antenna/coax/connector setup. Try Radio Shack or similar
for a cheap VSWR meter that covers the 2 metre amateur band. Should only
cost about $20 or less and every home installer of avionics should have
one. It will give you confidence in the antenna installation together
with the feeders and connectors.
John
From: Roger Roy
Hi John,
How's the avionics guru? I did as you suggested and put my battery
charger on the battery and all seem to workload and clear. I was unable
to had another person TX with the portable I will check this out
tomorrow, again thank you, Cheers
RJ
From: John Rippengal
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
Message 4
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| Subject: | Re: Need Comm Troubleshooting Advice |
That's more good advice John, thanks
RJ
----- Original Message -----
From: John Rippengal<mailto:j.rippengal@cytanet.com.cy>
To: avionics-list@matronics.com<mailto:avionics-list@matronics.com>
Sent: Tuesday, July 03, 2007 2:59 PM
Subject: Re: Avionics-List: Need Comm Troubleshooting Advice
Glad it seems to be ok now Roger. An aircraft standing around for
quite a time while a new avionics pack is being fitted is a good clue to
there being a flat battery. However the other advice given to you to
check with a VSWR meter is a good one. The Bird Thru' Line meter is a
sort of Rolls Royce professional type and you really don't need that for
a good check on your antenna/coax/connector setup. Try Radio Shack or
similar for a cheap VSWR meter that covers the 2 metre amateur band.
Should only cost about $20 or less and every home installer of avionics
should have one. It will give you confidence in the antenna installation
together with the feeders and connectors.
John
From: Roger Roy<mailto:Savannah174@msn.com>
Hi John,
How's the avionics guru? I did as you suggested and put my battery
charger on the battery and all seem to workload and clear. I was unable
to had another person TX with the portable I will check this out
tomorrow, again thank you, Cheers
RJ
From: John Rippengal<mailto:j.rippengal@cytanet.com.cy>
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
http://www.matronics.com/Navigator?Avionics-List<http://www.matronics.com
/Navigator?Avionics-List>
Message 5
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| Subject: | Crossbow NAV425EX Service Bulletin |
| From: | "Mike@Crossbow" <msmith@xbow.com> |
Due to a recent firmware update from our GPS manufacturer, Crossbow has published
a service bulletin for the NAV425EX which contains details about a possible
software update that may affect customers that are currently flying the NAV425EX.
The software update provided by the GPS subsystem manufacturer contains improvements
that eliminate the possibility of erroneous data during very specific
satellite configurations. In addition, we have made some improvements to the
magnetometer performance and BIT (built in test) status inside the NAV425EX.
You can find the full details of this service bulletin, including the units
affected using the link below.
Sincerely,
Michael Smith
Application Engineer
Crossbow Technology
msmith@xbow.com [url][/url]
--------
Michael Smith
Application Engineer Inertial Systems
Crossbow Technology
msmith@xbow.com
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