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CDM1550

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jaythescanman

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Sep 14, 2006
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Red Deer Alberta
I have 2 CDM1500 radios, I am trying to use one as a feed radio and had hooked it up to the computer line jack (Pin 1- pin 16+) The radios are both making squeeling and popping sounds and get very hot (tried reversing polarity same result). What am I doing wrong, I do still get sound out of both but it isnt right.
 

mmckenna

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Pin 1 and Pin 16 are the external speaker connections. I wouldn't use those as a point to connect to your computer.
I'd recommend using Pin 7 as ground and Pin 11 as the hot side. This is the "Flat RX audio out" connection.
 

SteveC0625

Order of the Golden Dino since 1972
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Northville, NY (Fulton County)
I have 2 CDM1500 radios, I am trying to use one as a feed radio and had hooked it up to the computer line jack (Pin 1- pin 16+) The radios are both making squeeling and popping sounds and get very hot (tried reversing polarity same result). What am I doing wrong, I do still get sound out of both but it isnt right.
There is lots of documentation in other threads here on RR and on the batboard about using flat Rx audio from the CDM radios for feeds, recording, and external PA systems. I encourage you to look up some of them and learn the details of this.

If the sound is still not right without the external speaker audio (1 & 16) connected, you may have fried something in the audio circuitry of the radio. Flat Rx may still work fine for your application.

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Search tags: In North America, the Professional or Waris Series of radios includes:

CDM750 CDM1250 CDM1550 HT1250LS+ CDM1550LS+ CDM1550LS

It may be helpful to search using wildcards.
If someone asks a question about one model,
the answer usually pertains to most, if not all.
They are all programmed with HVN9025 CPS.
 

cmdrwill

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Mar 30, 2005
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So Cali
Pin 11 should be set to Filtered Audio Out (programming), and it is not affected by the volume control, also squelched. Remember this IS LINE OUT and will go into the Line IN on your computer.. It will not drive a speaker. Use a DC blocking capacitor so the DC does not feed back into the radio.

Connecting either pin 1 or 16, the speaker, can destroy the bridged audio amp in the radio.Neither side is grounded.

AKA Record Out.
 
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