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berkut13(at)berkut13.com
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 Posted: Thu Feb 15, 2007 12:06 pm Post subject: Com audio issues |
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Yup...switches with "ganged" inputs. See below link for the schematic.
(300K .jpg)
http://www.berkut13.com/dloads/ka-134.jpg
I'm glad you attached Dan's reply, I never received it. I guess I can
perform surgery on the input lines and install a 220-ohm resistor on each.
Yeah, it's a hunk of junk King! I wish I had never installed it...but it's
far worse to try to extract it and start over now. Anyone know if the VAL
(same size) has a isolation circuit built in? It might become a "throw
money at it" solution if the resistors don't help.
What I don't understand is why Com1 (iCom) can be "switched" in with all the
other inputs with no adverse affects. But, the com2 (Becker) can't - ANY
input source that's switches in takes the Becker to almost zero and, of
course, when the volume is turned all the way up it's all distorted. Add
all you want to the iCom and the blend in just fine. Is that what John is
suggesting might be cause by the iCom possibly having a significantly lower
impedance than the other radios?
I can also tell you that the iCom's output is very robust compared to the
other radios. It's quite loud, deep and clear with very little turn of the
volume knob - very sensitive. Not sure that says anything other that it's
got a good amp on it, but I'll put that out there too.
Again, thanks for all the help!
James
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berkut13(at)berkut13.com
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| Posted: Thu Feb 15, 2007 4:01 pm Post subject: Com audio issues |
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Referring to the schematic for the KA-134 in previous email:
| Quote: | >Are you sure that the switches connect the output of your problem
>audio source directly to another output? Maybe I have missed something.
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| Quote: | I see what I was missing! I didn't see the "headphone out" at the top
right.
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Yeah...and the bloody thing is marketed as having an isolation amp built in.
That's true...but what they don't tell you is that it's for the cabin
speaker and ramp hail ONLY! Grrrrr!!
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nuckollsr(at)cox.net
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| Posted: Thu Feb 15, 2007 4:18 pm Post subject: Com audio issues |
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At 05:56 PM 2/15/2007 -0600, you wrote:
| Quote: |
Referring to the schematic for the KA-134 in previous email:
>>Are you sure that the switches connect the output of your problem
>>audio source directly to another output? Maybe I have missed something.
>I see what I was missing! I didn't see the "headphone out" at the top right.
Yeah...and the bloody thing is marketed as having an isolation amp built
in. That's true...but what they don't tell you is that it's for the cabin
speaker and ramp hail ONLY! Grrrrr!!
|
Hmmmm . . . well . . . there's always plan-b:
http://www.aeroelectric.com/DIY/Audio_Isolation_Amplifier.pdf
Bob . . .
----------------------------------------
( IF one aspires to be "world class", )
( what ever you do must be exercised )
( EVERY day . . . )
( R. L. Nuckolls III )
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