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icom radio trouble

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dalewhelan

Joined: 11 Nov 2008
Posts: 105
Location: USA ARIZONA fountain hills

Posted: Tue Sep 01, 2009 5:28 pm Post subject: icom radio trouble

I have an Icom A24

The radio transmits fine until I install the pigtail and hook up either of my headsets. Then it squeals like feedback in my ears and to a nearby(200 yards away) ground station.

I am using the battery when doing this and the radio indicates (TX)

In flight on the Icom power supply it has been reported that they hear my motor more than me.

I can not hear the side tone any longer.

Reception is fine.

The pig tail show no connection from any terminal to any other terminal.

Perhaps a short occurs when I install the jacks.

Does any one have any ideas on this?

_________________
Dale Whelan
503 powered Firestar II, Luscombe 8A
Projection, A simple and interesting Psychological concept

herbgh(at)nctc.com
Guest

Posted: Tue Sep 01, 2009 5:36 pm Post subject: icom radio trouble

Some radios have to be programmed to turn the internal mike off...Herb



At 08:28 PM 9/1/2009, you wrote:

 	  Quote: 	
		  



I have an Icom A24

The radio transmits fine until I install the pigtail and hook up 

either of my headsets. Then it squeals like feedback in my ears and 

to a nearby(200 yards away) ground station.

I am using the battery when doing this and the radio indicates (TX)

In flight on the Icom power supply it has been reported that they 

hear my motor more than me.

I can not hear the side tone any longer.

Reception is fine.

The pig tail show no connection from any terminal to any other terminal.

Perhaps a short occurs when I install the jacks.

Does any one have any ideas on this?



--------

Dale Whelan

503 powered Firestar II

Projection, A simple and interesting Psychological concept





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p 60936#260936





Checked by AVG - www.avg.com

09/01/09 20:03:00

Dana

Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA

Posted: Tue Sep 01, 2009 5:50 pm Post subject: icom radio trouble

At 09:28 PM 9/1/2009, dalewhelan wrote:

 	  Quote: 	
		  



I have an Icom A24

The radio transmits fine until I install the pigtail and hook up either of 

my headsets. Then it squeals...


	


I had the same problem, all A24's do it.  It's RF feedback in the mike 

cable.  The only way to fix it is to remote the antenna.  It doesn't have 

to be far; I bought a 6' cable and a connector at Radio Shack and put the 

original rubber duck antenna at the end.  It's only about 2' from the 

radio, the rest of the cable is coiled up, but it takes care of the problem.



I made a plastic block to clamp the connector and mounted the antenna, 

pointing straight down, under the fuel tanks (under my knees in the UltraStar.



I've heard that [only] a couple of expensive David Clark headsets don't 

have this problem with the A24.



People can hear me fine when I transmit, but I've only ever used the 

internal battery.  If you're getting engine noise on external power, you 

probably need some kind of filter on the power supply.



Dana



--

  Freedom means letting other people do things you don't like.

dalewhelan

Joined: 11 Nov 2008
Posts: 105
Location: USA ARIZONA fountain hills

Posted: Tue Sep 01, 2009 6:37 pm Post subject: Re: icom radio trouble

Dana thanks for the reply.

I have been using the radio with a six foot antenna cable for about a year, antenna pointing down from the nose. it just started acting up Monday.

It squeals on the battery with the external antenna.

One headset is David Clark (Older)

Motor noise has not been a problem since I installed BR8ES plugs, resistor caps, and wrapped the plug wires.

I am planning to inspect and or replace the plugs and caps as they have 100 hours on them.

_________________
Dale Whelan
503 powered Firestar II, Luscombe 8A
Projection, A simple and interesting Psychological concept

lcottrell

Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or

Posted: Tue Sep 01, 2009 7:04 pm Post subject: icom radio trouble

Check for a short that is causing the radio to be in  transmit mode. Other than that your mikes in the headset are directional, most  use them one way for tractors, the reverse for pushers.

 Good Luck

 Larry

 [quote]   ---

_________________
do not archive

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Wed Sep 02, 2009 8:36 am Post subject: icom radio trouble

If you're getting engine noise on external power, you

 	  Quote: 	
		   probably need some kind of filter on the power supply.



 Dana


	




Dale W/Dana/Gang:



A nice big capacitor between the reg/rec, about 20,000 mf, resistor spark 

plugs, and resistor spark plug caps (no...you won't fall out of the sky 

running resistor plugs and caps) will take care of a lot of the ign and 

alternator noise from the Rotax.



john h

mkIII

Junction, KS - Home of the Big Red One, 1st Infantry Division

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Wed Sep 02, 2009 8:36 am Post subject: icom radio trouble

> I have been using the radio with a six foot antenna cable for about a 

year, antenna pointing down from the nose. it just started acting up Monday.

 	  Quote: 	
		   It squeals on the battery with the external antenna.

 >
	


 > Dale Whelan



Dale W/Gang:



Many times a squeal will indicate a poor ground when the transmit button is 

pushed.



john h

mkIII

Junction, KS

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

jbhart(at)onlyinternet.ne
Guest

Posted: Wed Sep 02, 2009 9:37 am Post subject: icom radio trouble

At 06:28 PM 9/1/09 -0700, you wrote:

 	  Quote: 	
		  




	


Dale,



I had a similar problem, see:



http://jackbhart.com/firefly/firefly110.html



One can purchase these split ferrite chokes at:



http://www.allelectronics.com/make-a-store/category/235/Ferrites/1.html



Purchase one that will let you loop the head set or microphone switch cord 

through the split two times, and place it as close to the radio socket as 

possible.  I believe you will like the results.



Jack B. Hart FF004

Winchester, IN

dalewhelan

Joined: 11 Nov 2008
Posts: 105
Location: USA ARIZONA fountain hills

Posted: Wed Sep 02, 2009 5:26 pm Post subject: Re: icom radio trouble

I had to laugh at myself, I said it has been working for 1 year.

Let me paint a more accurate picture, it has been working for the past 130 hours.

I have BR8ES spark plugs, NGK TB05EMA plug caps and wrapped plug wires with a condenser on (at) the regulator rectifier.

A remote antenna, can't hear a side tone when I transmit. I hear no motor noise but a pilot said he did.

I haven't used the little ferite magnet but have not had problems before now.

It stand to reason something has changed but I don't know what.

I expect Icom will be getting in touch with me soon.

As soon as I get a solution I will relate it.

I had no troubles with it when I flew a week ago.

Thanks for the advice.

_________________
Dale Whelan
503 powered Firestar II, Luscombe 8A
Projection, A simple and interesting Psychological concept

George Alexander

Joined: 10 Jan 2006
Posts: 245
Location: SW Florida

Posted: Thu Sep 03, 2009 4:14 pm Post subject: Re: icom radio trouble

 	  dalewhelan wrote: 	
		  

===SNIP=== 

.....can't hear a side tone when I transmit.

===SNIP=== 

 	




Dale et al:

Don't know about the rest of the stuff, but the side tone issue happened recently with a local.   The slide switch on the headset had been moved to stereo.  He put it back to mono and worked fine.



Might not be your problem, but worth a look.

_________________
George Alexander
FS II R503
E-LSA N709FS
http://www.oh2fly.net

dalewhelan

Joined: 11 Nov 2008
Posts: 105
Location: USA ARIZONA fountain hills

Posted: Mon Sep 07, 2009 5:15 pm Post subject: Re: icom radio trouble

Found part of the problem, Icom told me the squeal happens when you use a headset with no PTT switch.

My headset does this even with the mic disconnected up at the headset.

As for motor noise, I found my plug gap open to .035''.

I have corrected that but not tested yet.

_________________
Dale Whelan
503 powered Firestar II, Luscombe 8A
Projection, A simple and interesting Psychological concept

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