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Radio Transmits Poorly Only When On The Ground

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DaveG601XL

Joined: 27 Oct 2006
Posts: 351
Location: Cincinnati, Oh

Posted: Mon Nov 03, 2014 4:06 am Post subject: Radio Transmits Poorly Only When On The Ground

I have a gremlin that I don't know how to troubleshoot. I have a 601XL all-metal airplane with an Icom A-200 radio, a RAMI com antenna mounted on the top skin and connected with RG-400 cable. I did all the installation myself. I have had this flying for 6 years now. It transmits just fine in the air, but when I initially installed it, I would get comments that it was a bit garbled while transmitting on the ground. It was always good enough though, as I could still carry on a 2-way conversation, plus I was able to operate out of tower controlled airports and not get any negative radio comments. Receiving wise, I have always been able to hear just fine whether on the ground or in the air. 



Just this summer, I started to get comments from fellow pilots that I was totally unreadable while transmitting on the ground. It would become crystal clear as soon as I took off. Does anyone have any thoughts of why this could be occurring or any place in particular I should start my troubleshooting?? 



Thanks,

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_________________
David Gallagher
Cincinnati, OH area

ceengland7(at)gmail.com
Guest

Posted: Mon Nov 03, 2014 11:50 am Post subject: Radio Transmits Poorly Only When On The Ground

On 11/3/2014 6:06 AM, DaveG601XL wrote:

 	  Quote: 	
		   



 I have a gremlin that I don't know how to troubleshoot. I have a 601XL all-metal airplane with an Icom A-200 radio, a RAMI com antenna mounted on the top skin and connected with RG-400 cable. I did all the installation myself. I have had this flying for 6 years now. It transmits just fine in the air, but when I initially installed it, I would get comments that it was a bit garbled while transmitting on the ground. It was always good enough though, as I could still carry on a 2-way conversation, plus I was able to operate out of tower controlled airports and not get any negative radio comments. Receiving wise, I have always been able to hear just fine whether on the ground or in the air.



 Just this summer, I started to get comments from fellow pilots that I was totally unreadable while transmitting on the ground. It would become crystal clear as soon as I took off. Does anyone have any thoughts of why this could be occurring or any place in particular I should start my troubleshooting??



 Thanks,



 --------

 David Gallagher

 Zodiac 601 XL-B: flying, 280+ hours now

 Next project under construction: Finish my father's Aircamper

Everybody, or just some other pilots? I have a similar issue with my 
	


MicroAir when in receive mode and flying within a few hundred feet of 

another a/c. I'm pretty sure that the AGC (automatic gain control) in 

the MicroAir doesn't have enough range to avoid overdriving its input 

when the transmitting a/c is close. Other radios don't have this problem 

in the same environment.



Charlie

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yellowduckduo(at)gmail.co
Guest

Posted: Mon Nov 03, 2014 2:48 pm Post subject: Radio Transmits Poorly Only When On The Ground

I had a somewhat similar issue with that radio. At the time I had an 

assortment of headsets with different but not definitive results. 

Opening the case and reducing the mic gain helped but a slightly 

different setting seemed optimum for each headset . Eventually I noticed 

that the problem was worse in the morning and typically went away after 

10 or 15 minutes by which time I was usually airborne. When I asked 

David Clark whether this might have anything to do with my mic they said 

yes it could and they offered to replace it which did indeed fix the 

issue for me.  I bought a second DC headset and have been happy ever since.

Ken



On 03/11/2014 2:45 PM, Charlie England wrote:

 	  Quote: 	
		   

 <ceengland7(at)gmail.com>



 On 11/3/2014 6:06 AM, DaveG601XL wrote:

> 

> <david.m.gallagher(at)ge.com>

>

> I have a gremlin that I don't know how to troubleshoot. I have a 

> 601XL all-metal airplane with an Icom A-200 radio, a RAMI com antenna 

> mounted on the top skin and connected with RG-400 cable. I did all 

> the installation myself. I have had this flying for 6 years now. It 

> transmits just fine in the air, but when I initially installed it, I 

> would get comments that it was a bit garbled while transmitting on 

> the ground. It was always good enough though, as I could still carry 

> on a 2-way conversation, plus I was able to operate out of tower 

> controlled airports and not get any negative radio comments. 

> Receiving wise, I have always been able to hear just fine whether on 

> the ground or in the air.

>

> Just this summer, I started to get comments from fellow pilots that I 

> was totally unreadable while transmitting on the ground. It would 

> become crystal clear as soon as I took off. Does anyone have any 

> thoughts of why this could be occurring or any place in particular I 

> should start my troubleshooting??

>

> Thanks,

>

> --------

> David Gallagher

> Zodiac 601 XL-B: flying, 280+ hours now

> Next project under construction: Finish my father's Aircamper

 Everybody, or just some other pilots? I have a similar issue with my 

 MicroAir when in receive mode and flying within a few hundred feet of 

 another a/c. I'm pretty sure that the AGC (automatic gain control) in 

 the MicroAir doesn't have enough range to avoid overdriving its input 

 when the transmitting a/c is close. Other radios don't have this 

 problem in the same environment.



 Charlie



 _

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