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armyret(at)mchsi.com
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 Posted: Thu Feb 15, 2007 6:42 am Post subject: Radio Problem |
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Here is my set up: Ky-97A comm- Flightcom 403 intercom- Allen grip control (trim-PTT).
Problem: Won't transmit. I can receive other xmissions and the TX lights up on the Ky97A when I push the PTT from either control (Pilot or Co-Pilot) If you listen to another radio, you can hear a weak carrier when you push the PTT but no voice. I can't get the plane to a Avionics shop since I have not flown off the req 40 hrs yet. The radio has been sent out to a avionics shop and declared as OK. Any thoughts? Thanks in advance.
Al Young
N601AY
[quote][b]
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zsmith3rd(at)earthlink.ne
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| Posted: Thu Feb 15, 2007 8:05 am Post subject: Radio problem |
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do not archive
Try another microphone or headset.
If that doesn't work check your wiring. It is real easy to get on the wrong pin if you went directly to the rear of the radio. It is also easy to reverse MIC HIGH & Ground. Moulded plastic plugs usually have extremely small, little bitty, tiny, invisible, hard-to-read letters/numbers moulded into the plug shell. A giant magnifying glass and proper lighting will help.
If you have the usual mic/earphone set of jacks (one larger in diameter than the other) and the intercom is in the mix, try bypassing the intercom. In other words, walk through it one piece of equipment at a time......make the radio work from each input first, then add the intercom. The solder tabs on typical mic/ear jacks are easy to mis-connect......eyeball carefully.
Bottom line is this: If it was bench-checked and found okay then it is some minor error in the wiring and therefore you will never find it because all the trees are obscured by the forest........really difficult to find one's own mistake.
Regards,
Zed//etc
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bryanmmartin
Joined: 10 Jan 2006
Posts: 1018
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| Posted: Thu Feb 15, 2007 12:35 pm Post subject: Radio Problem |
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If the radio checks out good and you can recieve well, the antenna is good. The problem must be in the microphone wiring, the intercomm or the intercomm to comm connections.
On Feb 15, 2007, at 9:41 AM, Al Young wrote:
| Quote: | Here is my set up: Ky-97A comm- Flightcom 403 intercom- Allen grip control (trim-PTT).
Problem: Won't transmit. I can receive other xmissions and the TX lights up on the Ky97A when I push the PTT from either control (Pilot or Co-Pilot) If you listen to another radio, you can hear a weak carrier when you push the PTT but no voice. I can't get the plane to a Avionics shop since I have not flown off the req 40 hrs yet. The radio has been sent out to a avionics shop and declared as OK. Any thoughts? Thanks in advance.
Al Young
N601AY
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Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus redrive.
do not archive.
[quote][b]
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_________________
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Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive. |
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japhillipsga(at)aol.com
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| Posted: Thu Feb 15, 2007 12:56 pm Post subject: Radio Problem |
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Al, that sounds much like my set up. I had a similar problem. Could receive fine, but when transmitting a high pitch whine accompanied the words. Fix was a separate ground wire from the headset jacks up to the main ground buss bar. I had thought the baggage deck where the jacks were mounted was ground enough, but not so. The separate wire fixed the problem. Maybe it will fix yours. I talked to David Cotton couple weeks ago. He said he finally got his plane parts to his hanger in Winder and was running control cables. I will try to find time to fly up there to help/ look see, but this RV-8 is using most every moment of my time so I have to have priorities. Best regards, Bill of Georgia
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armyret(at)mchsi.com
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| Posted: Thu Feb 15, 2007 4:13 pm Post subject: Radio Problem |
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Many thanks Bill- Give David my best. Regards, Al Do Not Archive.
[quote] ---
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