knox sentralok / CDM1250 install
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knox sentralok / CDM1250 install
our department has gone to Knox Sentralok key locks. We currently utilize CDM1250 radios in the apparatus. in order to integrate the key boxes to be released by the dispatcher I need the tones that come over the radio channel to be transferred over to the Sentralok box.
I figured that the "flat audio" on pin 11 of the accessory plug was the best way to go for this, but it's a 2 wire setup from the sentralok box, where would the other audio wire be connected ?
I suppose the other option would be to use the "speaker" pins, but I fear that if someone turned the radio down too far or up to far that the signal would not be able to be picked up, or it would become too distorted respectively.
Any guidance would be appreciated
I figured that the "flat audio" on pin 11 of the accessory plug was the best way to go for this, but it's a 2 wire setup from the sentralok box, where would the other audio wire be connected ?
I suppose the other option would be to use the "speaker" pins, but I fear that if someone turned the radio down too far or up to far that the signal would not be able to be picked up, or it would become too distorted respectively.
Any guidance would be appreciated
Re: knox sentralok / CDM1250 install
I know that my department uses the flat audio for the Knox box keys. Not a problem - CDM 1250's & 1550's
Re: knox sentralok / CDM1250 install
I would ask someone better versed, than myself, on accessory pins - I am not sure what you would use with the flat audio (I would think another flat audio or an audio ground). I'm sure that someone here can give you the correct info.
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Re: knox sentralok / CDM1250 install
One wire to flat audio out, the other to a ground pin. Pin 7 will work
Re: knox sentralok / CDM1250 install
Pin 7 is ground
Pin 11 is flat rx audio and is partially programmable
Pin 1 is speaker -
Pin 16 is speaker +
The flat rx audio should work
Pin 11 is flat rx audio and is partially programmable
Pin 1 is speaker -
Pin 16 is speaker +
The flat rx audio should work
fineshot1
NJ USA
NJ USA
Re: knox sentralok / CDM1250 install
One point that you should investigate is that there is some DC bias voltage on the pin 11 flat audio out.
Check out the internal circuit of the Knox Box and see if they have a cap in series with the audio input.
If not, then you might want to add something like a 1.0 uf cap to block the DC.
I have seen some installs where if the cap was not installed, the fixed audio level was too low to be used.
Without the cap, the signal gets grounded by what ever the load is that you are connecting.
Jim
Check out the internal circuit of the Knox Box and see if they have a cap in series with the audio input.
If not, then you might want to add something like a 1.0 uf cap to block the DC.
I have seen some installs where if the cap was not installed, the fixed audio level was too low to be used.
Without the cap, the signal gets grounded by what ever the load is that you are connecting.
Jim
fineshot1 wrote:Pin 7 is ground
Pin 11 is flat rx audio and is partially programmable
Pin 1 is speaker -
Pin 16 is speaker +
The flat rx audio should work
Re: knox sentralok / CDM1250 install
I have a mobil repeater connected to a CDM 1250. It uses the Discriminater , pin # 11, can I also connect the Sentraloc to the same pin without causing any loading problems. Thanks.
Re: knox sentralok / CDM1250 install
Without having schematics in front of me of all equipment used, I would expect loading when double terminating like that. You should probably make a resistor bridge to minimize the effect, and then adjust your inputs accordingly.JD wrote:I have a mobil repeater connected to a CDM 1250. It uses the Discriminater , pin # 11, can I also connect the Sentraloc to the same pin without causing any loading problems. Thanks.
Re: knox sentralok / CDM1250 install
I think you would want the FILTERED AUDIO output.
"Mobile repeater" ? Can you elaborate?
"Mobile repeater" ? Can you elaborate?
Re: knox sentralok / CDM1250 install
Pyramid SVR 200 ,