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Test pattern yields a 1011 Hz tone at reference level

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eagle65

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I am looking through the ANSI/TIA-102.CAAA (March 2016) and not clear on what the table is? How long is this pattern? Any description would be appreciated.

1.4.3.7 Standard Symbol Patterns
.........

a) Standard Tone Test Pattern:
This test pattern yields a 1011 Hz tone at reference level at the receiver vocoder.

Standard Tone Test Pattern Symbol Table Modulation
557 5F5 FF7 7FF 293 554 7BC B19 4D0 DCE 24A 124
0D4 33C 0BE 1B9 184 4FC C16 296 276 0E4 E24 A10
90D 433 C0B E1B 918 44C FC1 629 627 60E C00 000
000 003 892 849 0D4 33C 02F 86E 461 13F C16 294
89D 839 000 000 001 C38 24A 124 350 CF0 2F8 6E4
184 4FF 058 A58 9D8 3B0 000 000 007 0E2 4A1 240
D43 3C0 BE1 B91 844 FF0 162 962 760 E6D E5D 548
ADE 389 284 90D 433 C08 F86 E46 113 FC1 629 624
D83 BA1 41C 2D2 BA3 890 A12 435 0CF 02F 86E 460
44F F05 8A5 89D 839 4C8 FB0 235 A4E 24A 124 350
33C 0BE 1B9 184 4FF 058 296 276 0EC 000 000 00C
892 849 0D4 33C 0BE 1B8 461 13F C16 296 276 0E4
557 5F5 FF7 7FF 293 AB8 A4E FB0 9A8 ACE 24A 124
0D4 33C 0BE 1B9 184 4FC C16 296 276 0EC E24 A10
90D 433 C0B E1B 918 44C FC1 629 627 60E 400 000
000 003 892 849 0D4 33C 02F 86E 461 13F C16 294
89D 83B 000 000 000 038 24A 124 350 CF0 2F8 6E4
184 4FF 058 A58 9D8 390 000 000 000 0E2 4A1 240
D43 3C0 BE1 B91 844 FF0 162 962 760 EE0 E00 000
000 389 284 90D 433 C08 F86 E46 113 FC1 629 624
D83 9AE 8B4 8B6 493 890 A12 435 0CF 02F 86E 460
44F F05 8A5 89D 83B 9A8 F4F 1FD 60E 24A 124 350
33C 0BE 1B9 184 4FF 058 296 276 0E4 000 000 00C
892 849 0D4 33C 0BE 1B8 461 13F C16 296 276 0EC
 

eagle65

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Hi everyone - does anyone have experience using the Standard Tone Test Pattern called the 1011 ? Any information on the user's experience will be helpful.

Thanks
 

jonwienke

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It appears to be a set of data values for a digital modulation scheme that result in a 1011Hz sine wave when fed into the vocoder. I'm guessing it's for calibrating the digital-to-analog section of radios--setting gain and such so the radios have a consistent unit-to-unit volume and the max digital output doesn't cause clipping in any of the analog amplifiers.
 

eagle65

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Thank you for the response.

Do you by any chance know how long in time this test pattern is?
I am assuming you can have it just repeat the pattern continuously also?
How long does the pattern need to run or for how long do you need to make BER measurements before you can state that you have collected enough measurements?
 

jonwienke

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I assume you would repeat the pattern continuously to generate the tone as long as needed.

For the rest, that would depend on what test or calibration you're doing.

What digital modulation or vocoder is this referencing? Each vocoder will have a different data pattern to represent a 1011Hz tone.
 

EricCottrell

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Hello,

I have a radio test set that supports P25. This is one of the patterns it can generate to test a P25 receiver. The hex numbers describe the symbols that need to be transmitted and likely consists of the full P25 protocol frames needed. It is repeated. It is likely a P25 Phase 1 pattern so it would use the IMBE vocoder.

DMR and NXDN also define similar patterns in their respective standards to test their receivers.

73 Eric
 

eagle65

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Thank you.

I feel I am getting closer to understanding it. The one question that remains is with regards to how long should the 1011 test tone be transmitted and a measurement be taken to determine a statistically significant BER value? I will be doing numerous static measurements at different distances away from the transmitter and would like to know for how long should I take these measurements?
 
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This test would typically be performed with a service monitor and tuner software. The monitor would generate the tone/pattern and the output would be decreased until 5% BER was reached (displayed in the tuner software). The output level would be noted and compared to the manufacturers specifications.

Essentially, it's a digital equivalent to 12 dB SINAD. It is also very common to see first and second generation radios spec out at the exact same signal level for both 12 dB SINAD and 5% BER (third generation is bringing more radios that spec out at 4-6 dB weaker signal levels for 5% BER compared to 12 dB SINAD).
 

d_w_b

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> Do you by any chance know how long in time this test pattern is?

Yes, It is 360 ms: 36 hex 24 rows x bit/hex = 3456 bits @ 9600 bps
 

d_w_b

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> at reference level at the receiver vocoder.

What is the reference level? In other words, if the transmission is demodulated and the audio tone sent to an oscilloscope, what should the amplitude be (e.g. that governs the volume on the receiver's speaker).
 

RFI-EMI-GUY

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I am looking through the ANSI/TIA-102.CAAA (March 2016) and not clear on what the table is? How long is this pattern? Any description would be appreciated.

1.4.3.7 Standard Symbol Patterns
.........

a) Standard Tone Test Pattern:
This test pattern yields a 1011 Hz tone at reference level at the receiver vocoder.

Standard Tone Test Pattern Symbol Table Modulation
557 5F5 FF7 7FF 293 554 7BC B19 4D0 DCE 24A 124
0D4 33C 0BE 1B9 184 4FC C16 296 276 0E4 E24 A10
90D 433 C0B E1B 918 44C FC1 629 627 60E C00 000
000 003 892 849 0D4 33C 02F 86E 461 13F C16 294
89D 839 000 000 001 C38 24A 124 350 CF0 2F8 6E4
184 4FF 058 A58 9D8 3B0 000 000 007 0E2 4A1 240
D43 3C0 BE1 B91 844 FF0 162 962 760 E6D E5D 548
ADE 389 284 90D 433 C08 F86 E46 113 FC1 629 624
D83 BA1 41C 2D2 BA3 890 A12 435 0CF 02F 86E 460
44F F05 8A5 89D 839 4C8 FB0 235 A4E 24A 124 350
33C 0BE 1B9 184 4FF 058 296 276 0EC 000 000 00C
892 849 0D4 33C 0BE 1B8 461 13F C16 296 276 0E4
557 5F5 FF7 7FF 293 AB8 A4E FB0 9A8 ACE 24A 124
0D4 33C 0BE 1B9 184 4FC C16 296 276 0EC E24 A10
90D 433 C0B E1B 918 44C FC1 629 627 60E 400 000
000 003 892 849 0D4 33C 02F 86E 461 13F C16 294
89D 83B 000 000 000 038 24A 124 350 CF0 2F8 6E4
184 4FF 058 A58 9D8 390 000 000 000 0E2 4A1 240
D43 3C0 BE1 B91 844 FF0 162 962 760 EE0 E00 000
000 389 284 90D 433 C08 F86 E46 113 FC1 629 624
D83 9AE 8B4 8B6 493 890 A12 435 0CF 02F 86E 460
44F F05 8A5 89D 83B 9A8 F4F 1FD 60E 24A 124 350
33C 0BE 1B9 184 4FF 058 296 276 0E4 000 000 00C
892 849 0D4 33C 0BE 1B8 461 13F C16 296 276 0EC
You know, it would be cool if someone could write a program to generate that test pattern and 4 level modulation in a PIC so that an old school system analyser like HP8920B could test P25 receivers.

Sent from my SM-T350 using Tapatalk
 
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You know, it would be cool if someone could write a program to generate that test pattern and 4 level modulation in a PIC so that an old school system analyser like HP8920B could test P25 receivers.

Sent from my SM-T350 using Tapatalk


I actually mentioned that to a friend after I had previously posted above. Good use of a RPi.


Sent from my iPhone using Tapatalk
 

RFI-EMI-GUY

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I actually mentioned that to a friend after I had previously posted above. Good use of a RPi.


Sent from my iPhone using Tapatalk
In reading the TIA documents there are several other test patterns that are useful for simulating 5% bit error, interference, and silence that would be quite useful as well. A "widget" that does this with a PIC, Arduino or RPI would be great for hobbyist. Also I understand DMR has similar patterns.
 

ElroyJetson

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"Reference level" is full scale digital audio. Max volume. But that does NOT mean that the radio's volume control is to be cranked up all the way. It's not for testing the audio output of the audio amplifier or speaker, it's for alignments farther back in the receiver.

Instead, in this case, "reference level" means "100 percent deviation".
 

RFI-EMI-GUY

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"Reference level" is full scale digital audio. Max volume. But that does NOT mean that the radio's volume control is to be cranked up all the way. It's not for testing the audio output of the audio amplifier or speaker, it's for alignments farther back in the receiver.

Instead, in this case, "reference level" means "100 percent deviation".
Right, there is no such thing as 60% system deviation in the digital world. The demodulator would not recognize it as valid data.

Sent from my SM-T350 using Tapatalk
 

d_w_b

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Ya'll are right about the C4FM modulation waveform deviation, but isn't the specification talking about a reference level for the baseband audio waveform that is used by the vocoder? The vocoder creates a pattern of digital bits (e.g. samples) that represents the analog message. Is it 12 dB of the max sample amplitude, e.g. 4 bits less than max sample amplitude?
 

Quasar_A

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For APCO-P25 there are documents with test patterns description, but what are documents available for DMR?
I watched MotoTRBO tuner for DP1400, and found 1031 Hz, Silence Pattern and O.153 (511 PRS as I understand) pattern. I want to build test pattern generator with SDR radio, but can't find description for this.
 

RFI-EMI-GUY

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For APCO-P25 there are documents with test patterns description, but what are documents available for DMR?
I watched MotoTRBO tuner for DP1400, and found 1031 Hz, Silence Pattern and O.153 (511 PRS as I understand) pattern. I want to build test pattern generator with SDR radio, but can't find description for this.
You might start with searching for DMR ETSI standards, as they can be downloaded for free.

It would also be useful to have a widget that encodes and decodes the audio stream that could interface with a service monitor.

https://en.m.wikipedia.org/wiki/Digital_mobile_radio

Sent from my SM-T350 using Tapatalk
 

Quasar_A

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You might start with searching for DMR ETSI standards, as they can be downloaded for free.

It would also be useful to have a widget that encodes and decodes the audio stream that could interface with a service monitor.

https://en.m.wikipedia.org/wiki/Digital_mobile_radio

Sent from my SM-T350 using Tapatalk
Of course, I already read this documents:

ETSI TS 102 361-1: the DMR air interface protocol
ETSI TS 102 361-2: the DMR voice and generic services and facilities
ETSI TS 102 361-3: the DMR data
ETSI TS 102 361-4: the DMR Trunking protocol
ETSI TR 102 398: DMR General System Design

There is no answer to this question. May be somebody know any other documents with test patterns?
 
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