Today's Message Index:
----------------------
1. 04:23 AM - Re: RADIO SCREAM (Robert Riegner)
2. 04:25 AM - Re: RADIO SCREAM (Robert Riegner)
3. 05:01 AM - Re: RADIO SCREAM (Brian Lloyd)
4. 05:46 AM - Re: RADIO SCREAM (Robert Riegner)
5. 05:48 AM - Re: RADIO SCREAM (Robert Riegner)
6. 06:11 AM - Re: RADIO SCREAM (Fred Fillinger)
7. 06:13 AM - Re: RADIO SCREAM (Brian Lloyd)
8. 09:22 AM - Re: RADIO SCREAM (Robert Riegner)
9. 11:05 AM - Re: RADIO SCREAM (Robert Riegner)
10. 11:30 AM - 337s, GPS installs, and AC 20-138A (TeamGrumman@aol.com)
11. 11:34 AM - Re: RADIO SCREAM (John Rippengal)
12. 12:54 PM - Re: RADIO SCREAM (Robert Riegner)
13. 09:41 PM - Re: RADIO SCREAM (ECLarsen81@aol.com)
Message 1
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| Subject: | Re: RADIO SCREAM |
--> Avionics-List message posted by: "Robert Riegner" <rade66@msn.com>
Dave'
It is much more prominent in the bottom radio. Most of the time i
can get the top radio to transmit good enough to be heard but the bottom
radio, once it starts it's thing, is completely unusable and squeals so loud
that you cannot hear yourself in your own headset.What completely baffles me
is the fact that it is intermitent[not always identically the same]. Most of
the time[at the present] the radios seem to start out fine, but as soon as
engine startup and warmup takes place they seem to deteriorate,bottom always
getting worse until takeoff and after first couple minutes of flight are
unusable.Why would the transponder light lite up[transponder on] when PTT is
pushed? and why would the nav needles move when PTT is pushed?As a young
mechanic in my late teens, i recall loose grounds being the cause of most of
my wacky scenarios.Awhile back i recall going out flying for a couple of
hours and the first 1/2 to 3/4 of an hour was perfect radio wise, and then
the problem would start. Now i really can't get any usable time because of
the problem. so i guess you could say it has gotten progressively worst.
Bob
>From: "David Lloyd" <skywagon@charter.net>
>Reply-To: avionics-list@matronics.com
>To: <avionics-list@matronics.com>
>Subject: Re: Avionics-List: RADIO SCREAM
>Date: Thu, 26 Aug 2004 16:19:26 -0700
>
>--> Avionics-List message posted by: "David Lloyd" <skywagon@charter.net>
>
>Bob,
>Do both radios squeal the same when turned on one at a time?
>If they do then you can probably rule out an antenna or coax feed problem.
>Any chance that you have a cabin speaker over head that is active when it
>should only be supplying audio to the headphones. I once found feedback
>from the speaker going back via the mike and setting up a feedback
>squeal...but, that is rare. And, I think you said that they check out fine
>as long as the engine is not running. Then, it has to be in the charging
>or
>magneto system. Maybe a noise filter failed...
>Let us know....
>David
>
>
>----- Original Message -----
>From: "Robert Riegner" <rade66@msn.com>
>To: <avionics-list@matronics.com>
>Subject: Re: Avionics-List: RADIO SCREAM
>
>
> > --> Avionics-List message posted by: "Robert Riegner" <rade66@msn.com>
> >
> > Thanks for all the great ideas guys.
> > David,
> > The stock[cessna] audio panel was replaced by an avionics
>tech.[
> > KMA24] The radios worked fine when the replace was done. The radio still
> > squeals when the second radio is turned off and PTT pushed.
> > Bob
> >
> >
> > >From: "David Lloyd" <skywagon@charter.net>
> > >Reply-To: avionics-list@matronics.com
> > >To: <avionics-list@matronics.com>
> > >Subject: Re: Avionics-List: RADIO SCREAM
> > >Date: Thu, 26 Aug 2004 09:10:12 -0700
> > >
> > >--> Avionics-List message posted by: "David Lloyd"
><skywagon@charter.net>
> > >
> > >Bob,
> > >Was anything done or changed in your audio panel unit? Most audio
>boxes
>do
> > >a lot of isolation of one comm. from the other when TX'ing. If this
> > >isolation fails then comm. RF energy can leak to the other comm. and
>cause
> > >the headset scream that you mention. If you turn one radio off, do you
> > >still get the noise in the headset when the PTT is pressed?
> > >
> > >You may have a common ground for the panel bus or other that has a
>loose
> > >connection or a broken wire causing a ground loop that is active during
> > >TX'ing because of the higher current going to the comm. unit.
> > >
> > >If anything in your antenna coax, connectors, antenna is not right,
> > >grounds,
> > >feeds, etc., the TX'ing comm. will radiate RF that could blast into the
>2nd
> > >comm.
> > >
> > >Let us all know what you find.....?
> > >David
> > >
> > >
> > >----- Original Message -----
> > >From: "Robert Riegner" <rade66@msn.com>
> > >To: <avionics-list@matronics.com>
> > >Subject: Avionics-List: RADIO SCREAM
> > >
> > >
> > > > --> Avionics-List message posted by: "Robert Riegner"
><rade66@msn.com>
> > > >
> > > > 1980 172N SKYHAWK II....2-TKM Slide-in replacements were installed a
> > >couple
> > > > of years ago[Which by the way have worked flawless till now] The
>last
>6
> > > > months or so i have been getting tremendous squealing or feedback
>when
> > >Ptt
> > > > is pushed. Radios have been switched top for bottom with no change.
> > >headsets
> > > > have been changed, different PTT's have been used. Radios were sent
>back
> > >to
> > > > factory and nothing found.Radios receive loud and clear.Cleaned all
> > >radio
> > > > contacts and antenna contacts, reinstalled everything and checked on
>the
> > > > ground with handheld[engine not running],everything sounded
>fine.Started
> > > > plane,taxied,took off, and radios were unusable again. Transponder
>light
> > > > lites[sometimes] and vor needles move when PTT is pushed.Problem is
>only
> > > > with transmittion and when PTT is pushed, static and squeal are so
>bad
> > >it's
> > > > hard to stand on the headset. If i remember correctly, radio volume
> > >control
> > > > does nothing to increase or decrease noise.It's like the Bremuda
> > >Triangle
> > >in
> > > > there!!!
> > > >
> > > > BOB RIEGNER
> > > > N60846
> > > > 1980 172N SKYHAWKII
> > > > RADIO SQUEAL
> > > >
> > > >
> > >
> > >
> >
> >
>
>
Message 2
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| Subject: | Re: RADIO SCREAM |
--> Avionics-List message posted by: "Robert Riegner" <rade66@msn.com>
Dave,
Also, i do have an overhead speaker, but it is not active, at
least not by the audio panel. All the speaker bottons are dissengaged on the
audio panel.
Bob
>From: "David Lloyd" <skywagon@charter.net>
>Reply-To: avionics-list@matronics.com
>To: <avionics-list@matronics.com>
>Subject: Re: Avionics-List: RADIO SCREAM
>Date: Thu, 26 Aug 2004 16:19:26 -0700
>
>--> Avionics-List message posted by: "David Lloyd" <skywagon@charter.net>
>
>Bob,
>Do both radios squeal the same when turned on one at a time?
>If they do then you can probably rule out an antenna or coax feed problem.
>Any chance that you have a cabin speaker over head that is active when it
>should only be supplying audio to the headphones. I once found feedback
>from the speaker going back via the mike and setting up a feedback
>squeal...but, that is rare. And, I think you said that they check out fine
>as long as the engine is not running. Then, it has to be in the charging
>or
>magneto system. Maybe a noise filter failed...
>Let us know....
>David
>
>
>----- Original Message -----
>From: "Robert Riegner" <rade66@msn.com>
>To: <avionics-list@matronics.com>
>Subject: Re: Avionics-List: RADIO SCREAM
>
>
> > --> Avionics-List message posted by: "Robert Riegner" <rade66@msn.com>
> >
> > Thanks for all the great ideas guys.
> > David,
> > The stock[cessna] audio panel was replaced by an avionics
>tech.[
> > KMA24] The radios worked fine when the replace was done. The radio still
> > squeals when the second radio is turned off and PTT pushed.
> > Bob
> >
> >
> > >From: "David Lloyd" <skywagon@charter.net>
> > >Reply-To: avionics-list@matronics.com
> > >To: <avionics-list@matronics.com>
> > >Subject: Re: Avionics-List: RADIO SCREAM
> > >Date: Thu, 26 Aug 2004 09:10:12 -0700
> > >
> > >--> Avionics-List message posted by: "David Lloyd"
><skywagon@charter.net>
> > >
> > >Bob,
> > >Was anything done or changed in your audio panel unit? Most audio
>boxes
>do
> > >a lot of isolation of one comm. from the other when TX'ing. If this
> > >isolation fails then comm. RF energy can leak to the other comm. and
>cause
> > >the headset scream that you mention. If you turn one radio off, do you
> > >still get the noise in the headset when the PTT is pressed?
> > >
> > >You may have a common ground for the panel bus or other that has a
>loose
> > >connection or a broken wire causing a ground loop that is active during
> > >TX'ing because of the higher current going to the comm. unit.
> > >
> > >If anything in your antenna coax, connectors, antenna is not right,
> > >grounds,
> > >feeds, etc., the TX'ing comm. will radiate RF that could blast into the
>2nd
> > >comm.
> > >
> > >Let us all know what you find.....?
> > >David
> > >
> > >
> > >----- Original Message -----
> > >From: "Robert Riegner" <rade66@msn.com>
> > >To: <avionics-list@matronics.com>
> > >Subject: Avionics-List: RADIO SCREAM
> > >
> > >
> > > > --> Avionics-List message posted by: "Robert Riegner"
><rade66@msn.com>
> > > >
> > > > 1980 172N SKYHAWK II....2-TKM Slide-in replacements were installed a
> > >couple
> > > > of years ago[Which by the way have worked flawless till now] The
>last
>6
> > > > months or so i have been getting tremendous squealing or feedback
>when
> > >Ptt
> > > > is pushed. Radios have been switched top for bottom with no change.
> > >headsets
> > > > have been changed, different PTT's have been used. Radios were sent
>back
> > >to
> > > > factory and nothing found.Radios receive loud and clear.Cleaned all
> > >radio
> > > > contacts and antenna contacts, reinstalled everything and checked on
>the
> > > > ground with handheld[engine not running],everything sounded
>fine.Started
> > > > plane,taxied,took off, and radios were unusable again. Transponder
>light
> > > > lites[sometimes] and vor needles move when PTT is pushed.Problem is
>only
> > > > with transmittion and when PTT is pushed, static and squeal are so
>bad
> > >it's
> > > > hard to stand on the headset. If i remember correctly, radio volume
> > >control
> > > > does nothing to increase or decrease noise.It's like the Bremuda
> > >Triangle
> > >in
> > > > there!!!
> > > >
> > > > BOB RIEGNER
> > > > N60846
> > > > 1980 172N SKYHAWKII
> > > > RADIO SQUEAL
> > > >
> > > >
> > >
> > >
> >
> >
>
>
Message 3
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| Subject: | Re: RADIO SCREAM |
--> Avionics-List message posted by: Brian Lloyd <brianl@lloyd.com>
On Aug 27, 2004, at 7:20 AM, Robert Riegner wrote:
> --> Avionics-List message posted by: "Robert Riegner" <rade66@msn.com>
>
> getting worse until takeoff and after first couple minutes of flight
> are
> unusable.Why would the transponder light lite up[transponder on] when
> PTT is
> pushed? and why would the nav needles move when PTT is pushed?As a
> young
> mechanic in my late teens, i recall loose grounds being the cause of
> most of
> my wacky scenarios.
I really do think you are looking at a bad coax shield connection or a
bad ground at the comm antenna(s). If it were my airplane here is how
I would troubleshoot the problem:
1. Remove, inspect, and repair the BNC connectors at the antennas.
2. Unbolt the comm antennas from the airframe in order to inspect and
clean where the antenna bolts to the airframe. A little scotchbright
goes a long way here.
3. Inspect and repair the shield braid connection at the radio tray.
When there is a break in the shield RF gets inside the airframe (we can
talk about Faraday cages here if you want to) and affects everything.
Every wire in the airplane will pick up the RF to some extent. The
nonlinear devices (transistors, diodes, etc.) will rectify the RF and
provide DC voltages to make indicator pointers move, lights light, etc.
BTW, if the coax is older than about 10 years, rip in out and replace
it with good stuff like RG-400. It will help solve problems in the
long run.
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
+1.340.998.9447 St. Thomas, VI 00802
Message 4
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| Subject: | Re: RADIO SCREAM |
--> Avionics-List message posted by: "Robert Riegner" <rade66@msn.com>
Thanks kindly Brian. This stuff is fascinating. Thanks to all the brains out
there behind the info we may well get this problem fixed. Will certainly
post any progress made. Annual due now so radios will come after.Any and all
suggestions always accepted. Thanks guys.
BOB
N6084G
>From: Brian Lloyd <brianl@lloyd.com>
>Reply-To: avionics-list@matronics.com
>To: avionics-list@matronics.com
>Subject: Re: Avionics-List: RADIO SCREAM
>Date: Fri, 27 Aug 2004 07:58:12 -0400
>
>--> Avionics-List message posted by: Brian Lloyd <brianl@lloyd.com>
>
>On Aug 27, 2004, at 7:20 AM, Robert Riegner wrote:
>
> > --> Avionics-List message posted by: "Robert Riegner" <rade66@msn.com>
> >
> > getting worse until takeoff and after first couple minutes of flight
> > are
> > unusable.Why would the transponder light lite up[transponder on] when
> > PTT is
> > pushed? and why would the nav needles move when PTT is pushed?As a
> > young
> > mechanic in my late teens, i recall loose grounds being the cause of
> > most of
> > my wacky scenarios.
>
>I really do think you are looking at a bad coax shield connection or a
>bad ground at the comm antenna(s). If it were my airplane here is how
>I would troubleshoot the problem:
>
>1. Remove, inspect, and repair the BNC connectors at the antennas.
>
>2. Unbolt the comm antennas from the airframe in order to inspect and
>clean where the antenna bolts to the airframe. A little scotchbright
>goes a long way here.
>
>3. Inspect and repair the shield braid connection at the radio tray.
>
>When there is a break in the shield RF gets inside the airframe (we can
>talk about Faraday cages here if you want to) and affects everything.
>Every wire in the airplane will pick up the RF to some extent. The
>nonlinear devices (transistors, diodes, etc.) will rectify the RF and
>provide DC voltages to make indicator pointers move, lights light, etc.
>
>BTW, if the coax is older than about 10 years, rip in out and replace
>it with good stuff like RG-400. It will help solve problems in the
>long run.
>
>Brian Lloyd 6501 Red Hook Plaza
>brianl@lloyd.com Suite 201
>+1.340.998.9447 St. Thomas, VI 00802
>
>
Message 5
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| Subject: | Re: RADIO SCREAM |
--> Avionics-List message posted by: "Robert Riegner" <rade66@msn.com>
Brian,
I assume that the coax is probably 24 yrs old.
Bob
>From: Brian Lloyd <brianl@lloyd.com>
>Reply-To: avionics-list@matronics.com
>To: avionics-list@matronics.com
>Subject: Re: Avionics-List: RADIO SCREAM
>Date: Fri, 27 Aug 2004 07:58:12 -0400
>
>--> Avionics-List message posted by: Brian Lloyd <brianl@lloyd.com>
>
>On Aug 27, 2004, at 7:20 AM, Robert Riegner wrote:
>
> > --> Avionics-List message posted by: "Robert Riegner" <rade66@msn.com>
> >
> > getting worse until takeoff and after first couple minutes of flight
> > are
> > unusable.Why would the transponder light lite up[transponder on] when
> > PTT is
> > pushed? and why would the nav needles move when PTT is pushed?As a
> > young
> > mechanic in my late teens, i recall loose grounds being the cause of
> > most of
> > my wacky scenarios.
>
>I really do think you are looking at a bad coax shield connection or a
>bad ground at the comm antenna(s). If it were my airplane here is how
>I would troubleshoot the problem:
>
>1. Remove, inspect, and repair the BNC connectors at the antennas.
>
>2. Unbolt the comm antennas from the airframe in order to inspect and
>clean where the antenna bolts to the airframe. A little scotchbright
>goes a long way here.
>
>3. Inspect and repair the shield braid connection at the radio tray.
>
>When there is a break in the shield RF gets inside the airframe (we can
>talk about Faraday cages here if you want to) and affects everything.
>Every wire in the airplane will pick up the RF to some extent. The
>nonlinear devices (transistors, diodes, etc.) will rectify the RF and
>provide DC voltages to make indicator pointers move, lights light, etc.
>
>BTW, if the coax is older than about 10 years, rip in out and replace
>it with good stuff like RG-400. It will help solve problems in the
>long run.
>
>Brian Lloyd 6501 Red Hook Plaza
>brianl@lloyd.com Suite 201
>+1.340.998.9447 St. Thomas, VI 00802
>
>
Message 6
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| Subject: | Re: RADIO SCREAM |
--> Avionics-List message posted by: "Fred Fillinger" <n3eu@comcast.net>
Robert Riegner wrote:
> Why would the transponder light lite up[transponder on] when PTT is
> pushed? and why would the nav needles move when PTT is pushed?
On the transponder, X-Files or Twilight Zone comes to mind. It seems
to me also that radiated RF is the source of your problem, but there's
no way that even RF radiated at the transponder freq and going into
its antenna input can cause a reply. Do you have a remote ident
switch? Any wire (which can pick up radiated RF) which feeds a
semiconductor can cause whatever that wire does to exhibit visible
behavior on a device, like the VOR head. However, a quick peek at
King and Narco schematics shows remote ident goes direct to an IC, but
with a "pull down" arrangement, so a few mV tops introduced there
shouldn't do anything. Unless maybe the strength of the radiated
pickup is so large it's effect on the +5V internal supply is
triggering a key IC device inside.
Above analysis is why, for me, first place to look is RF pickup by the
mic audio line. Lousy half a mV pickup is potential trouble, and some
mics are high impedance. Sorry, can't help beyond this, but an xponder
reply tells me we may be looking for something untypical.
Fred F.
Message 7
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| Subject: | Re: RADIO SCREAM |
--> Avionics-List message posted by: Brian Lloyd <brianl@lloyd.com>
On Aug 27, 2004, at 8:46 AM, Robert Riegner wrote:
> --> Avionics-List message posted by: "Robert Riegner" <rade66@msn.com>
>
> Brian,
> I assume that the coax is probably 24 yrs old.
24-year-old RG-58 coax is not much good.
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
+1.340.998.9447 St. Thomas, VI 00802
Message 8
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| Subject: | Re: RADIO SCREAM |
--> Avionics-List message posted by: "Robert Riegner" <rade66@msn.com>
Thank you
>From: "Fred Fillinger" <n3eu@comcast.net>
>Reply-To: avionics-list@matronics.com
>To: <avionics-list@matronics.com>
>Subject: Re: Avionics-List: RADIO SCREAM
>Date: Fri, 27 Aug 2004 09:14:19 -0400
>
>--> Avionics-List message posted by: "Fred Fillinger" <n3eu@comcast.net>
>
>Robert Riegner wrote:
>
> > Why would the transponder light lite up[transponder on] when PTT is
> > pushed? and why would the nav needles move when PTT is pushed?
>
>On the transponder, X-Files or Twilight Zone comes to mind. It seems
>to me also that radiated RF is the source of your problem, but there's
>no way that even RF radiated at the transponder freq and going into
>its antenna input can cause a reply. Do you have a remote ident
>switch? Any wire (which can pick up radiated RF) which feeds a
>semiconductor can cause whatever that wire does to exhibit visible
>behavior on a device, like the VOR head. However, a quick peek at
>King and Narco schematics shows remote ident goes direct to an IC, but
>with a "pull down" arrangement, so a few mV tops introduced there
>shouldn't do anything. Unless maybe the strength of the radiated
>pickup is so large it's effect on the +5V internal supply is
>triggering a key IC device inside.
>
>Above analysis is why, for me, first place to look is RF pickup by the
>mic audio line. Lousy half a mV pickup is potential trouble, and some
>mics are high impedance. Sorry, can't help beyond this, but an xponder
>reply tells me we may be looking for something untypical.
>
>Fred F.
>
>
Message 9
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| Subject: | Re: RADIO SCREAM |
--> Avionics-List message posted by: "Robert Riegner" <rade66@msn.com>
No remote ident switch!
>From: "Robert Riegner" <rade66@msn.com>
>Reply-To: avionics-list@matronics.com
>To: avionics-list@matronics.com
>Subject: Re: Avionics-List: RADIO SCREAM
>Date: Fri, 27 Aug 2004 12:18:49 -0400
>
>--> Avionics-List message posted by: "Robert Riegner" <rade66@msn.com>
>
>Thank you
>
>
> >From: "Fred Fillinger" <n3eu@comcast.net>
> >Reply-To: avionics-list@matronics.com
> >To: <avionics-list@matronics.com>
> >Subject: Re: Avionics-List: RADIO SCREAM
> >Date: Fri, 27 Aug 2004 09:14:19 -0400
> >
> >--> Avionics-List message posted by: "Fred Fillinger" <n3eu@comcast.net>
> >
> >Robert Riegner wrote:
> >
> > > Why would the transponder light lite up[transponder on] when PTT is
> > > pushed? and why would the nav needles move when PTT is pushed?
> >
> >On the transponder, X-Files or Twilight Zone comes to mind. It seems
> >to me also that radiated RF is the source of your problem, but there's
> >no way that even RF radiated at the transponder freq and going into
> >its antenna input can cause a reply. Do you have a remote ident
> >switch? Any wire (which can pick up radiated RF) which feeds a
> >semiconductor can cause whatever that wire does to exhibit visible
> >behavior on a device, like the VOR head. However, a quick peek at
> >King and Narco schematics shows remote ident goes direct to an IC, but
> >with a "pull down" arrangement, so a few mV tops introduced there
> >shouldn't do anything. Unless maybe the strength of the radiated
> >pickup is so large it's effect on the +5V internal supply is
> >triggering a key IC device inside.
> >
> >Above analysis is why, for me, first place to look is RF pickup by the
> >mic audio line. Lousy half a mV pickup is potential trouble, and some
> >mics are high impedance. Sorry, can't help beyond this, but an xponder
> >reply tells me we may be looking for something untypical.
> >
> >Fred F.
> >
> >
>
>
Message 10
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| Subject: | 337s, GPS installs, and AC 20-138A |
--> Avionics-List message posted by: TeamGrumman@aol.com
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Message 11
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| PREVIOUS | Skip to PREVIOUS Message |
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--> Avionics-List message posted by: "John Rippengal" <j.rippengal@cytanet.com.cy>
Hey Robert you seem to be dancing all round the periphery but not
cutting to the chase. When are you going to change that coax??
John
--> Avionics-List message posted by: "Robert Riegner" <rade66@msn.com>
No remote ident switch!
Message 12
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--> Avionics-List message posted by: "Robert Riegner" <rade66@msn.com>
JUST TRYING TO ANSWER ALL THE GOOD PEOPLE WHO HAVE GIVEN THERE ADVICE. FIRST
ON THE AGENDA WILL BE TO REPLACE BOTH NAV/COM COAX'S, MAKE SURE ANTENNA'S
ARE GROUNDED GOOD AT MOUNTING POINT, THEN MAKE SURE THERE IS NO LOOSE GROUND
BEHIND PANEL.I ONLY GET TO WORK IN MY HANGER ONE DAY ON THE WEEKEND AND I
NEED TO START ANNUAL THIS WEEKEND. BRICK BY BRICK MY CITIZENS....BRICK BY
BRICK.ALL HAVE GIVEN GOOD IDEAS AND AND HOPEFULLY NOTHING WILL BE MISSED
WITH SUCH KNOWLEDGEABLE SUBCRIBERS.
THANKS EVERYONE
BOB
N6084G
>From: "John Rippengal" <j.rippengal@cytanet.com.cy>
>Reply-To: avionics-list@matronics.com
>To: <avionics-list@matronics.com>
>Subject: RE: Avionics-List: RADIO SCREAM
>Date: Fri, 27 Aug 2004 19:31:43 +0100
>
>--> Avionics-List message posted by: "John Rippengal"
><j.rippengal@cytanet.com.cy>
>
>Hey Robert you seem to be dancing all round the periphery but not
>cutting to the chase. When are you going to change that coax??
>John
>
>
>--> Avionics-List message posted by: "Robert Riegner" <rade66@msn.com>
>
>No remote ident switch!
>
>
Message 13
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|
| Subject: | Re: RADIO SCREAM |
--> Avionics-List message posted by: ECLarsen81@aol.com
In a message dated 8/27/2004 7:24:40 AM Eastern Daylight Time, rade66@msn.com
writes:
Why would the transponder light lite up[transponder on] when PTT is
pushed?
Turn off your transponder and see if it goes away.
Ed Larsen
Ypsi, MI
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