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Hartmut, A clarification: the transmitter seemed to work fine again *right after landing and shutting down the engine.* But I have not yet tried shutting down just the radio while still in flight, as you suggested this morning. We have very busy airspace, so that experiment will have to wait until probably Tuesday enroute to Corona to meet my CFI. First I will try out flying the pattern using just my handheld ICOM with a headset jack (hopefully this weekend, weather permitting), to be sure I have SOME functional set-up before flying away from the pattern). Thank you for your trouble-shooting suggestions; I will certainly be trying them, while waiting for the replacement that Wayne Woollard has kindly offered me. (BTW, does anyone know whether all Cessna "300-series" radios will fit my tray? My present Nav-Com just says "300 Com" on the left and "300 Nav" on the right. Wayne didn't recall off-hand which exact model he has, just that it is "Cessna 300-series.") Thanks again, everyone! Linda From: "Hartmut Beil" <[EMAIL PROTECTED]> Date: Fri, 22 Dec 2006 22:11:52 +0100 To: "Ed Burkhead" <[EMAIL PROTECTED]>, "'Linda Abrams'" <[EMAIL PROTECTED]>, "Ctech" <[email protected]> Subject: Re: [COUPERS-TECH] radio transmitting problem Ed. I discussed the problem with Linda off list a bit and it turns out that the radio works fine again after been turned off for a minute or so. This indicates to me that something inside the radio is maybe getting warm or a capacitor is charging up or what have it that disables the radio when in use over time. A replacement is on the way thanks to Wayne and if the problem persists with Wayne's radio, one can look outside of the radio, if the problem is gone, I guess Wayne will make a sweet deal for Linda. Hartmut ----- Original Message ----- From: Ed Burkhead <mailto:[EMAIL PROTECTED]> To: 'Linda Abrams' <mailto:[EMAIL PROTECTED]> ; Ctech <mailto:[email protected]> Sent: Friday, December 22, 2006 10:03 PM Subject: RE: [COUPERS-TECH] radio transmitting problem ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- > Would your idea of "a weak element...in the transmitter" > account for the fact that after flying it a half-hour and > experiencing this problem deteriorating, when I landed > and shut down the engine, then transmissions were > immediately ok again? That is what is so weird to > me about this situation (and to the A&P). Linda, Humm, no. If its immediately OK when you shut down the engine, then, well, we dont know enough. Questions: 1. Does the tower (or other plane) hear you a. loud but garbled? b. loud but staticy? c. clear but progressively weaker? d. clear but sometimes weak, sometimes strong? 2. Is the problem that the tower and other planes cant hear you when you are a. on the ground taxiing out for takeoff? b. in the pattern? c. at certain points in the pattern? d. outside the pattern? 3. Does the signal quality a. stay the same throughout the flight? b. slowly decay throughout the flight? c. get sometimes bad, sometimes better? d. relate to engine power level? (i.e. if you reduce power to idle, does it help?) 4. Any relationship in which way the plane is pointed relative to the tower? 5. Are you using an intercom? If so, is it a. Battery or aircraft powered? b. Fresh batteries? 5. Some very old radios like that dont handle modern (electret) microphones well. a. Have you tried a separate microphone? b. Have you tried a separate carbon or dynamic microphone? c. Are you using an old carbon microphone? If so, bang it on something a few times to loosen up the carbon granules. Your responses to #1, #2 and #3 will give us a lot more to go on. Ah, aint debugging fun? Ed Burkhead http://edburkhead.com ed -at- edburkhead???.com (change -at- to @ and remove "???") ============================================================================ == To leave this forum go to: http://ercoupers.com/lists.htm ============================================================================== To leave this forum go to: http://ercoupers.com/lists.htm
