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XPR4550 VOX operation

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Anderegg

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Looking to implement an IFB (interruptible fold back) system using an XPR4550. Would like to take advantage of the VOX feature for this, running 1 watt output. Manual seems to indicate that a rear accessory connection is required for VOX, and includes a secondary audio INPUT. I see a separate menu option for audio gain on the accessory input in CPS.

Anyone have reference material, pin-outs etc, that could help in configuring this set-up? The radio operates on a Connect Plus system, but this function will only be used on a conventional analog frequency licensed for IFB.

Paul
 

com501

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All the information you need is in your System Planner and the Basic Service Manual for that radio, both available to be downloaded from your MOL account. You may, however, need to experiment with levels when using both inputs at once.
 

maximel

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Hello,

I work for CBC / Radio-Canada television in Montréal. I do something like that.

I dont use the vox option. I use the PTT (Press to talk) pin to activate the TX of the radio. I put a "ip powerbar" to turn on or off the radio.

I not sure, but in connect plus system, is a digital audio, and is very bad (audio weak, and music no pass thru) for IFB.

Other thing, the system manager of the connect plus system maybe put a timeout like "60 or 120" second of PTT. the radio stop to TX after the timeout.

Also, dont forget to put a fan on rear of the xpr. i'ts came hot... ever 1 watt if you dont want to blow the PA of the radio.

Give me some news about your project.

Max


Looking to implement an IFB (interruptible fold back) system using an XPR4550. Would like to take advantage of the VOX feature for this, running 1 watt output. Manual seems to indicate that a rear accessory connection is required for VOX, and includes a secondary audio INPUT. I see a separate menu option for audio gain on the accessory input in CPS.

Anyone have reference material, pin-outs etc, that could help in configuring this set-up? The radio operates on a Connect Plus system, but this function will only be used on a conventional analog frequency licensed for IFB.

Paul
 

Anderegg

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COM, I found the XPR4580 detailed service manual, cannot find one for the XPR4550. I figured they are the same..........the (MAP) Mobile Accessory Port is the name for the rear connection? Would I use the TX audio input and any GRD pin on the back for audio in?

Max, did you connect through the rear accessory connector, or the front microphone port?

Also, if anyone knows how (CPS) to elevate the alert tone audio level from the rear auxiliary audio output, that would be wonderful. We have our base station XPR4550 on the opposite side of our building, and while the voice audio level is loud, the talk permit and end of transmission levels are inaudible. That means everyone who keys the mic on the base transmitter gets the first few seconds of their voice traffic clipped. Using the standard alert level off-sets only raises the alert tone volume coming out of the radio speaker, which is still active in this configuration.

Paul
 

Anderegg

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Not wanting to fry anything....per the manual below. Assuming I can jack any LINE LEVEL source into the TX audio in, then adjust accessory mic gain to achive the desired audio level?

Transmit Audio

Transmit audio can be sourced from either the MMP or the MAP microphone paths found on
connectors J4001-30 or J4000-11 respectively. The MMP microphone carries a 9.3V bias through a
660 ohm load from R3532 and R3547 with a strong AC ground from C3524 through only a 560 ohm
load from R3547. Both MMP and MAP paths are routed to the MAKO separately. The MAP
microphone carries a 9.3V bias through a 660 ohm load from R3590 and R3535 with a strong AC
ground from C3543 through only a 560 ohm load from R3535. Depending on whether an MMP or
MAP PTT signal was activated, a single switching stage will route the correct microphone path to the
necessary gain stages and ADC that will send 16-bit PCM audio to the OMAP for signal processing
via the SSI bus.

The transmit gain stages in the MAKO is calibrated based on an 80mV input under standard test
conditions. The microphone sensitivity is programmable through the use of CPS.
 

maximel

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Hello Paul,

Sorry for the delay.

Max, did you connect through the rear accessory connector, or the front microphone port?

By the rear connector. I use the pin 11 (TX audio) and pin 12 (audio ground). I use a 600 ohms audio transformer to "cut" the 5v and make a protection on the side of the IFB routing or intercom output)


For the transmit on, i use pin 17 (PTT) and 18 ground.

Also in the software, i put the audio pre-emphasis, de-emphasis on the channel detail
and on the radio RX side for better audio.

Max
 

Anderegg

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So if I jacked the line out of a Uniden BCD996XT directly into pins 11 and 12, that voltage would cause some concerns/damage? I've got a line audio out modification done on an Astro Spectra that utilized a 600ohm transformer on the IC board.

Thanks for the specifics Max!

Paul
 

maximel

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Hello,

Ahhh! you dont use a XPR4550 for your project.... for the astro, you have the DB15 or DB25 on your radio? I give you the pin for a xpr4550



So if I jacked the line out of a Uniden BCD996XT directly into pins 11 and 12, that voltage would cause some concerns/damage? I've got a line audio out modification done on an Astro Spectra that utilized a 600ohm transformer on the IC board.

Thanks for the specifics Max!

Paul
 

Anderegg

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No, this is for the XPR4550. I was just commenting I had to have a modification done to the Astro line out to get rid of the DC voltage! Why must electronic devices rely so heavily on electricity. :)

Paul
 
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