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1. 09:47 PM - Com audio issues ()
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| Subject: | Com audio issues |
Hi Gurus,
It's been awhile, but I hope all is well with you all.
I'm having audio issues with my new Becker 4201 #2 com and was wondering if
you could help.
The issue is the output audio from the radio whenever there is another radio
switched into the same output. As soon as any other input is selected on
the audio panel at the same time, the com#2 volume goes very very low and is
overpowered. Sidetone during transmit seems un-affected as does the audio of
the other sources selected - only the Com2 audio drops down. By
itself...the radio sounds fine, and operates properly.
The #1 com (iCom A200) works fine and is nice and loud with any number of
inputs selected on the audio panel (KA-134). Adding additional inputs has
little to no affect on com1 volume. It works great - as it should.
According to the KA-134 schematics, the only thing it's doing with the phone
outputs from the radios is mechanically switching them (no electronics)
together to a single output line to the intercom. Because of this, I was
wondering if the impedance differences of the radios are a problem.
However, I have no real understand of the magic involved.
They are as follows according to the respective docs:
Com1 iCom - 500 ohms
Com2 Becker - 600 ohms
Eng mon - 560 ohms
Nav KN-53 - 500 ohms
I still puzzled why Com1 has no issues with any number of other inputs, and
Com2 does.
Any ideas? I have schematics for the KA-134 if you want to see it...but for
this, it's just switches.
Thanks for any help!
James Redmon
Berkut13 N97TX
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