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10-13-2015, 04:13 PM
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been here awhile
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Join Date: Dec 2004
Location: North Alabama
Posts: 4,301
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Quote:
Originally Posted by Doug
If you swap headsets does the problem follow?
Does the problem remain with the intercom power switched off? On my PS intercom turning the LH knob fully CCW the intercom is switched off and the connection is direct between the radio output and headset.
My thinking is that the headset impedance may be different between the headsets which will affect the relative audio level if the radio's output impedance is high. Also, check both headsets are set to Mono (or Stereo if that is how it should be).
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In my case none of those suggestions are factors. The passenger's relative volume is lower than the pilot's regardless of headset used and volume settings on the intercom or radio. That side just doesn't have as much intercom gain for some reason.
I work around it by turning radio volume up and my (pilot) headset volume down. Been this way for years, just never taken the time to figure out why. I've always assumed it is an intercom amp issue.
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10-13-2015, 07:07 PM
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Join Date: Apr 2014
Location: Tallahassee, FL
Posts: 38
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Quote:
Originally Posted by Sam Buchanan
In my case none of those suggestions are factors. The passenger's relative volume is lower than the pilot's regardless of headset used and volume settings on the intercom or radio. That side just doesn't have as much intercom gain for some reason.
I work around it by turning radio volume up and my (pilot) headset volume down. Been this way for years, just never taken the time to figure out why. I've always assumed it is an intercom amp issue.
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My intercom volume on the passenger side is fine. It is the output from the radio that is weak on the passenger side. I haven't had a chance to try some of the suggestions that have been posted. I have been working around like you have. Turning up the radio volume to about 75% and turning down my headset.
__________________
Don Thompson
Tallahassee, FL
Hangar D-3 Quincy, FL (2J9)
N726DT RV 6 Flying
N4493J '67 Cherokee 140 sold
N2120J '78 Warrior II owned twice, sold twice
2017 Dues Paid
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10-13-2015, 08:38 PM
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been here awhile
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Join Date: Dec 2004
Location: North Alabama
Posts: 4,301
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Quote:
Originally Posted by Sam Buchanan
In my case none of those suggestions are factors. The passenger's relative volume is lower than the pilot's regardless of headset used and volume settings on the intercom or radio. That side just doesn't have as much intercom gain for some reason.
I work around it by turning radio volume up and my (pilot) headset volume down. Been this way for years, just never taken the time to figure out why. I've always assumed it is an intercom amp issue.
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Quote:
Originally Posted by Apexeon
My intercom volume on the passenger side is fine. It is the output from the radio that is weak on the passenger side. I haven't had a chance to try some of the suggestions that have been posted. I have been working around like you have. Turning up the radio volume to about 75% and turning down my headset.
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I probably didn't state that very clearly.
Pilot-to-passenger volume is fine, the radio audio coming through the intercom is weaker on the passenger side.
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10-14-2015, 07:17 AM
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Join Date: Apr 2014
Location: Tallahassee, FL
Posts: 38
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Quote:
Originally Posted by Sam Buchanan
I probably didn't state that very clearly.
Pilot-to-passenger volume is fine, the radio audio coming through the intercom is weaker on the passenger side.
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Exactly. I'm going to print out the suggestions and go out to the airport at lunch and see if I can troubleshoot some more. I'll let you know what I find.
dt
__________________
Don Thompson
Tallahassee, FL
Hangar D-3 Quincy, FL (2J9)
N726DT RV 6 Flying
N4493J '67 Cherokee 140 sold
N2120J '78 Warrior II owned twice, sold twice
2017 Dues Paid
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10-14-2015, 08:37 AM
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Join Date: Nov 2012
Location: Cincinnati,Ohio KHAO
Posts: 128
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Audio Low...
Just reread the notes on the KX125:
**They (King) talk about low or distorted audio but don't reference the headphone when talking about low audio. I wonder if they mean the Mic is distorted or is low in volume. Hmmm Also required is a relay for two microphones so one is hot at a time.
**They (King) also say to use the 100mw audio to drive external headphones at P501-12. This may be the answer to the low audio. It was buried in the notes section and could have been overlooked at install time. Hard to believe the same thing happened in multiple cases.
Sorry, I think there is more to this story. The design is "different" than most KX155,165,170B older stuff. I believe the KX125 was designed after Gary and Min left from engineering to start a new company...... Garmin.
John
__________________
John R Prince
RV-7 want-a-b
Dues Paid for 20
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10-14-2015, 04:16 PM
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Join Date: Apr 2014
Location: Tallahassee, FL
Posts: 38
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Quote:
Originally Posted by Flyingleap
Just reread the notes on the KX125:
**They (King) talk about low or distorted audio but don't reference the headphone when talking about low audio. I wonder if they mean the Mic is distorted or is low in volume. Hmmm Also required is a relay for two microphones so one is hot at a time.
**They (King) also say to use the 100mw audio to drive external headphones at P501-12. This may be the answer to the low audio. It was buried in the notes section and could have been overlooked at install time. Hard to believe the same thing happened in multiple cases.
Sorry, I think there is more to this story. The design is "different" than most KX155,165,170B older stuff. I believe the KX125 was designed after Gary and Min left from engineering to start a new company...... Garmin.
John
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I think there is a relay for the mic as the PPT button controls each mic independently.
Unplugging the mic had no effect on the volume. I also discovered that the pilot side audio from the radio does not go through the intercom. My intercom is turned on and off by pushing the volume pot. When the intercom is off there is no radio output to the passenger side. How would I check to see if it is using the 100mw output? For now I can just do like Sam and work around it.
__________________
Don Thompson
Tallahassee, FL
Hangar D-3 Quincy, FL (2J9)
N726DT RV 6 Flying
N4493J '67 Cherokee 140 sold
N2120J '78 Warrior II owned twice, sold twice
2017 Dues Paid
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10-15-2015, 09:14 AM
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Join Date: Nov 2012
Location: Cincinnati,Ohio KHAO
Posts: 128
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Kx125
Don,
That was the copilot side mike you disconnected, right? And, I like the method that Sam is using, except be careful, when you plugin a new headphone on the pilots side it could get very loud. Not much of a problem though.
It looks like the audio is the 100mw for the pilot and they did put in the relays to isolate the mics. OK, here is what The KX125 says:
"The Mic audio must be switched from P100-H, Mic audio Hi to P501-16, Mic intercom Hi and P100-8 Mic key must be open to prevent com transmission"
P100-H = output mic audio Hi
P501-16 = Mic intercom Hi
P100-8 = Mic key
I "believe" the audio PS eng is not needed with the intent of the KX125
to solve that task. Not much of a solution now as the wiring is done.
The drawing does not show any type of audio panel/amp as an example.
The intent of the main drawing is to put in the relays to isolate mics, 100mw. output to both headphones, volume from KX125, done.
My work here is done, it's not fixed.
John
__________________
John R Prince
RV-7 want-a-b
Dues Paid for 20
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10-15-2015, 10:09 AM
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Join Date: Apr 2014
Location: Tallahassee, FL
Posts: 38
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Quote:
Originally Posted by Flyingleap
Don,
That was the copilot side mike you disconnected, right? And, I like the method that Sam is using, except be careful, when you plugin a new headphone on the pilots side it could get very loud. Not much of a problem though.
It looks like the audio is the 100mw for the pilot and they did put in the relays to isolate the mics. OK, here is what The KX125 says:
"The Mic audio must be switched from P100-H, Mic audio Hi to P501-16, Mic intercom Hi and P100-8 Mic key must be open to prevent com transmission"
P100-H = output mic audio Hi
P501-16 = Mic intercom Hi
P100-8 = Mic key
I "believe" the audio PS eng is not needed with the intent of the KX125
to solve that task. Not much of a solution now as the wiring is done.
The drawing does not show any type of audio panel/amp as an example.
The intent of the main drawing is to put in the relays to isolate mics, 100mw. output to both headphones, volume from KX125, done.
My work here is done, it's not fixed.
John
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John,
Thank you so much for attempting to help. I realize you spent a lot of time on this and I really appreciate your efforts.
I'm going to print out all the information and will do some more digging as time allows.
Thanks Again!!!
Don Thompson
__________________
Don Thompson
Tallahassee, FL
Hangar D-3 Quincy, FL (2J9)
N726DT RV 6 Flying
N4493J '67 Cherokee 140 sold
N2120J '78 Warrior II owned twice, sold twice
2017 Dues Paid
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11-13-2015, 10:05 AM
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Join Date: Apr 2014
Location: Tallahassee, FL
Posts: 38
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Update: Problem solved!!! :)
After lots of troubleshooting, I decided that the problem was most likely in the PS PM501 intercom. I called PS and talked with Greg who confirmed my thoughts. The 501 is an older unit and after weighing the cost to repair vs purchasing new, I ordered a PS 500EX intercom from Spruce. It is a direct plug and play replacement and my testing on the ground indicates that the old 501 was bad. The wife and I will test it out tomorrow on a flight to N. AL. (KANB) 
__________________
Don Thompson
Tallahassee, FL
Hangar D-3 Quincy, FL (2J9)
N726DT RV 6 Flying
N4493J '67 Cherokee 140 sold
N2120J '78 Warrior II owned twice, sold twice
2017 Dues Paid
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