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  #1  
Old 08-22-2011, 07:57 PM
meadeduck meadeduck is offline
 
Join Date: May 2008
Location: Marietta, Ga.
Posts: 220
Default "Scratchy" radio transmission

Lately, we've been having problems with people not being able to understand us with radio poor transmission WHILE IN THE AIR. We seem to have no problems when we're on the ground. Any ides where to start checking?
thanks
Meade
N612RV
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  #2  
Old 08-22-2011, 08:27 PM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
Default Antenna ?

Checking the antenna is a good starting point. It should be well grounded and cable connector should be secure.
Can you hear yourself talk while transmitting? If the side-tone is "scratchy", suspect the PTT switches.
Also try turning the intercom off to see if that makes a difference.
Joe Gores
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  #3  
Old 08-22-2011, 08:44 PM
JBPILOT JBPILOT is offline
 
Join Date: Nov 2007
Location: Jesup, Iowa
Posts: 1,657
Default Another unpleasant thought - -

I had a problem early on, and it turned out being the cable connection at the antenna. The center connector was not crimped well enough. Try moving the cable around at both ends to see if it makes any difference. I could move it and make it change. Not fun to fix, but can be done.

Do both PTT switches give the same results ?

John Bender
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  #4  
Old 08-23-2011, 08:18 AM
meadeduck meadeduck is offline
 
Join Date: May 2008
Location: Marietta, Ga.
Posts: 220
Default Antennae connections

I was kinda thinking along the same lines so I'm going up to the AP this am and check out the connections. Thanks to all.
Meade
N612RV
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  #5  
Old 09-11-2011, 12:10 PM
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JerryG150 JerryG150 is offline
 
Join Date: Nov 2006
Location: Bradenton, Florida
Posts: 348
Default me too ...

I was landing at KSRQ this morning and Tampa Approach said my transmission was extremely garbled. As I spoke my feedback in my ear was all broken up every second or two. I was fortunate they handed me off to KSRQ tower and they gave me clearance to land on 32 ... and told me to get it fixed immediately. Neadless to say I'll take it to Sarasota Avionics asap and let them know what you guys posted here. Thanks

While in the shop, I'll see if they can adjust or fix my anti-servo tab indicator on my Dynon 180 ... as soon as I make a slight adjustment, up or down, the indicator shows full up ... but the -12 pitches perfectly ... in tiny increments ... fine to fly ... just the indicator is off.

Oh yeh, my 4 year old grandson is trying to win an Ipad2 on Facebook. If any of you RVators have a Facebook account he would and I would appreciate your vote. (Click here to vote) He's the little guy holding up a piece of bacon. You can vote daily thru 10/2 if so inclined. Thanks a lot.
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"Time, be careful how you spend it ... cause it isn't going to last."
VAF #1037
Reserved N124JG for RV-12
"12 for Jerry G.
http://jerryg150rv12.blogspot.com/
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  #6  
Old 09-11-2011, 12:30 PM
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RickWoodall RickWoodall is offline
 
Join Date: Jan 2007
Location: Ontario Canada
Posts: 1,452
Default Back up comm

A little off topic, but just a suggestion for anyone opertating with just one comm. Carry your backup! I had a total comm failure during a recent flight across country with my son.

Luckily I had my vertex handheld, that comes with earjack plugs (like $200 complete). I grabbed it, snapped my headphones in and it was outstanding. Never had a comm failure before but very glad my handset was within reach, charged and had a headset jack. Turned a big problem into an almost not issue.

Just a suggestion to keep yours within reach and charged for action. Losing a comm when its your only one...not so much fun in controlled air and I was very lucky I didnt have to recall the light signal stuff.
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Rick Woodall C-GSTT "ghost"
9a -TMX io-320, catto three blade, dual dynon hdx with a/p. 900+ hrs in 8 yrs flying.

Flew to Osh 11,12,15,17,19. SNF 2013. West to Cali /Washington/Vancouver/crossed the Rockies north to Red Deer east to Moosonee and over to maritimes. South to Jekyll Isl, cedar key, and Key West etc. 6 trips and 17 islands of the Bahamas. Flown turtles and dogs for Pilots n Paws too. Love our Rv's
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  #7  
Old 09-11-2011, 06:22 PM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
Default

JerryG150,
Like John Bender asked, "Do both PTT switches give the same results?" Could be bad PTT switch. I replaced both of mine. Watch the little indicator on the SL40. Does it flash on and off? If so, that is another indication that the PTT switch or its wiring is bad. The SL-40 tray connector could also be the problem.
As for the pitch trim indicator, it could be a bad pot inside of the servo. Or it could be a bad connection. I would check the crimps and connectors at the servo.
Joe Gores
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  #8  
Old 09-26-2011, 06:05 AM
spriteah spriteah is offline
 
Join Date: May 2008
Location: Australai Victoria
Posts: 89
Default

If your transmission on ground is ok but in air bad then it leads to power, ground or interference problems.

Suggesting Revs and change in charging circuit might be part of it.

If you still have the problem send me an email at tatlockj@@netspace.net.au (less one @).

Give me all the info and I'll try and steer you towards a fix.

Jim
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  #9  
Old 09-28-2011, 12:57 PM
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JerryG150 JerryG150 is offline
 
Join Date: Nov 2006
Location: Bradenton, Florida
Posts: 348
Default radio transmission ...

Once again, I was in the hospital having my second triple bypass surgery when my avionics was installed.

That being said, after spending mucho $'s to have my radio checked out and ELT fixed, I asked ground for a radio check before taking off from Sarasota airport and I was still transmitting intermittently with lots of static.

I taxi'd to the avionics shop again and they checked it out. The technician pushed the radio deeper into the panel and he said it was much better. Then he pushed the transponder deeper into the panel also. Both units were not tightened into the tray. He then got an allen wrench and tightened both units thru the front hole ... radio is much better now.
__________________
"Time, be careful how you spend it ... cause it isn't going to last."
VAF #1037
Reserved N124JG for RV-12
"12 for Jerry G.
http://jerryg150rv12.blogspot.com/
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  #10  
Old 09-28-2011, 09:28 PM
meadeduck meadeduck is offline
 
Join Date: May 2008
Location: Marietta, Ga.
Posts: 220
Default Scratch radio...

While visiting relatives on the Left Coast, I went to Chino ("Flo's" got the BEST biscuits and red-eye gravy) and was wandering around the airport when I noticed an avionics shop. I stopped in and spoke with one of the techs there and he told me that I needed to reread the manual and do the setup on the radio....which I'm going to do as soon as I get back.
Meade
N612RV (1/2)
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