Xpr 6350

eyes00only · #1 (**permalink**) 04-23-2011, 4:48 PM

Why can't I capture the frequency of this radio (Motorola XPR 6350) with my Pro83 or PSR500?

This is the first time I've held the freq. counting unit inches from any transmitting
unit and not getting any readout. WTH ?

JK

gary123 · #2 (**permalink**) 04-23-2011, 7:06 PM

the radio is constantly transmitting and unkeying. this break in the signal is enough to mess up frequency counters and close call circuits. If you are close enough a close call will work but you almost have to be sitting on the antenna.

the best way to locate a TRBO signal is to search the freq band where you think the signal is. Using lockout in search will eliminate know or unwanted signals.

eyes00only · #3 (**permalink**) 04-23-2011, 8:50 PM

Quote:

Originally Posted by gary123

the radio is constantly transmitting and unkeying. this break in the signal is enough to mess up frequency counters and close call circuits. If you are close enough a close call will work but you almost have to be sitting on the antenna.

the best way to locate a TRBO signal is to search the freq band where you think the signal is. Using lockout in search will eliminate know or unwanted signals.

Is the way the radio is supposed to work? I guess that's what they mean by digital. The antenna has VHF on it. I had the counter an inch from the antenna. I also tried your other method by searching 150.000 to 154.00 but will try that again. Thanks
for the reply sir.

JK

davidgcet · #4 (**permalink**) 04-23-2011, 9:51 PM

if it is in digital mode then it is using TDMA and thus every few microseconds it unkeys to "share" the channel with another user. your scanner cannot decode TRBO anyway, but you can use a disc tap and run DSD to do it.

crazyman28 · #5 (**permalink**) 01-22-2013, 11:22 AM

I hate to bring up an old thread, but just to clarify from what I have read, you CAN NOT scan (pro-106) a Motorola XPR 6350 if it is transmitting digital?

Git-R-Done · #6 (**permalink**) 01-22-2013, 12:11 PM

Quote:

Originally Posted by crazyman28

I hate to bring up an old thread, but just to clarify from what I have read, you CAN NOT scan (pro-106) a Motorola XPR 6350 if it is transmitting digital?

Correct, you can decode MotoTRBO transmissions on a digital scanner unless you preform a discriminator tap and use a program that decodes MotoTRBO digital transmissions.

gtaman · #7 (**permalink**) 01-22-2013, 2:16 PM

I found mine by using signal stalker. Just searched uhf and then I heard the digital noise. Un keyed and key up again to make sure it was the freq and it was.

ramal121 · #8 (**permalink**) 01-22-2013, 9:33 PM

Quote:

Originally Posted by gtaman

I found mine by using signal stalker. Just searched uhf and then I heard the digital noise. Un keyed and key up again to make sure it was the freq and it was.

It depends on what you are trying to receive. If the TRBO radio is transmitting to a repeater, it will be pulsed on-off and a freq counter will not lock on to it. A scan type scheme maybe will catch it. Now if the radio is transmitting on simplex, it will be a constant RF transmission and anything should be able to sniff that out.

crazyman28 · #9 (**permalink**) 01-23-2013, 10:15 AM

Quote:

Originally Posted by gtaman

I found mine by using signal stalker. Just searched uhf and then I heard the digital noise. Un keyed and key up again to make sure it was the freq and it was.

Thanks for the responses.

So, using stalker I am able to find that the radio frequency the XPR 6350 is operating on. However, it is just digital static. Is there anyway to actually here the transmission?

Git-R-Done · #10 (**permalink**) 01-23-2013, 10:18 AM

Quote:

Originally Posted by crazyman28

Thanks for the responses.

So, using stalker I am able to find that the radio frequency the XPR 6350 is operating on. However, it is just digital static. Is there anyway to actually here the transmission?

On your PSR-500 you'll have to or someone you know will have to do a discriminator tap inside your radio then download a program that you can find out the color code and talk group the people are using.

gtaman · #11 (**permalink**) 01-23-2013, 1:52 PM

Quote:

Originally Posted by crazyman28

Thanks for the responses.

So, using stalker I am able to find that the radio frequency the XPR 6350 is operating on. However, it is just digital static. Is there anyway to actually here the transmission?

You would need a discrimiter tap to actually "hear" the audio. But to find the freq you hear the digital noise that is just as annoying as p25 on an analog scanner.

JRayfield · #12 (**permalink**) 01-23-2013, 9:10 PM

Actually, that is not the case, with respect to simplex operation.

When a MOTOTRBO radio (or any DMR radio, for that matter) is transmitting in simplex mode, the transmitter is still being 'pulsed' on and off. In fact, the latest firmware for MOTOTRBO units allows them to sync between themselves in simplex mode, so that they can operate in a 6.25E mode (6.25 khz equivalent) without using a repeater.

John Rayfield, Jr. CETma

Quote:

Originally Posted by ramal121

It depends on what you are trying to receive. If the TRBO radio is transmitting to a repeater, it will be pulsed on-off and a freq counter will not lock on to it. A scan type scheme maybe will catch it. Now if the radio is transmitting on simplex, it will be a constant RF transmission and anything should be able to sniff that out.

ramal121 · #13 (**permalink**) 01-24-2013, 10:33 PM

Quote:

Originally Posted by JRayfield

Actually, that is not the case, with respect to simplex operation.

When a MOTOTRBO radio (or any DMR radio, for that matter) is transmitting in simplex mode, the transmitter is still being 'pulsed' on and off. In fact, the latest firmware for MOTOTRBO units allows them to sync between themselves in simplex mode, so that they can operate in a 6.25E mode (6.25 khz equivalent) without using a repeater.

John Rayfield, Jr. CETma

Yes, you are correct. My reply was clouded with visions of FDMA dancing before me.

JRayfield · #14 (**permalink**) 01-25-2013, 11:52 PM

LOL!!! That's good! :-)

John

Quote:

Originally Posted by ramal121

Yes, you are correct. My reply was clouded with visions of FDMA dancing before me.

KC2OBW · #15 (**permalink**) 01-25-2013, 11:57 PM

Quote:

Originally Posted by JRayfield

Actually, that is not the case, with respect to simplex operation.

When a MOTOTRBO radio (or any DMR radio, for that matter) is transmitting in simplex mode, the transmitter is still being 'pulsed' on and off. In fact, the latest firmware for MOTOTRBO units allows them to sync between themselves in simplex mode, so that they can operate in a 6.25E mode (6.25 khz equivalent) without using a repeater.

John Rayfield, Jr. CETma

Part of that statement is not true. P25 phase 1 doesn't pulse on and off like trbo. P25 phase 1 is a constant carrier when the ptt is keyed.

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MikeOxlong · #16 (**permalink**) 01-26-2013, 7:30 AM

Quote:

Originally Posted by KC2OBW

Part of that statement is not true. P25 phase 1 doesn't pulse on and off like trbo. P25 phase 1 is a constant carrier when the ptt is keyed.

Where in this thread has anybody mentioned P25?

KC2OBW · #17 (**permalink**) 01-26-2013, 7:42 AM

Quote:

Originally Posted by MikeOxlong

Where in this thread has anybody mentioned P25?

Last time I checked P25 was considered DMR

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MikeOxlong · #18 (**permalink**) 01-26-2013, 7:57 AM

No, P25 has nothing to do with DMR.

DMR refers to radios built to a specific ETSI standard which P25 radios are not.

KC2OBW · #19 (**permalink**) 01-26-2013, 9:06 AM

Quote:

Originally Posted by MikeOxlong

No, P25 has nothing to do with DMR.

DMR refers to radios built to a specific ETSI standard which P25 radios are not.

I apologize for my miss information then. That I didn't know.

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