f.miskelly(at)imperial.ac
Guest
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 Posted: Wed Aug 22, 2007 2:07 pm Post subject: KX155 Nav/com 'acoustic feedback' |
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Discovered today the radio interference is coming from the intercom! I disconnected the KX155 internal intercom and the problem disappeared! The radio worked fine. My questions now are:
1. Can anyone explain why the interference arises from the intercom? Is the intercom esp prone to interference?
2. I'm told the KX155 internal intercom is poor and people often have to install an external intercom eg. SPA400. Is that correct?
3. If i install an external intercom will that solve the problem?
4. To disconnect the intercom i removed the 'intercom mic' pin. From my pin-out diagram of the KX155 the 'intercom mic' pin is #8. My radio is wired with the 'intercom mic' into pin B (B for Bravo). Can someone confirm the correct pin for the 'intercom mic'? Is it pin 8 or pin B?
Many thanks
Frank
| Quote: | The KX155 nav/com in my Glastar has 2 problems which may be related.
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>1. Inserting the headphone jack i have near perfect reception.
>However, when i insert the microphone jack there is a loud whine
>suggestive of 'acoustic feedback'. Moving the boom away from my mouth
>reduces the whine. With a different headset it appears as lots of
>static noise which again changes with position of the boom. I've
>changed the aerial, power supply and checked all the earths. It occurs
>with either mag and when the generator is disconnected. It only
>happens when the engine is running. The radio's been bench tested and
>passed as good.
>2. Radio reception is good with just the headphone jack inserted.
>However, insert the microphone jack and reception becomes very poor or
| Quote: | disappears completely. I suspect the 'acoustic feedback' is raising
>the automatic squelch which is cutting off the radio station
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