Module I/O Specifications

A5 Premodulation Filter and NSM

From A34 GSM-RTI Assembly

 

 

 

 

 

 

PMF_DATA J1(1)

 

 

 

 

Level:

TTL

 

 

 

 

Rate:

270.833 kbps

 

 

 

 

Format:

Non-differential data encoded

 

 

 

The PMF_DATA signal is difficult to measure accurately without a high speed oscilloscope or logic analyzer. Using a Spectrum Analyzer, an increased noise floor can be seen when probed about the centre frequency of 270 kHz. Using an oscilloscope, the signal can be measured at 4.4 Vp-p. On a DVM, 2.25 Vdc.

From A15 Reference GSM-RTI Assembly

10 MHz Ref B J2(33)

 

 

Frequency:

10 MHz ± 500 Hz

 

 

Wave Shape:

Sine

 

 

Level:

>10 dBm

 

 

Harmonics:

< 25 dBc

 

 

 

The 10 MHz Reference signal can be measured on an oscilloscope at 880 mVrms and

 

2.6 Vp-p. On a Spectrum Analyzer, the marker will be approximately +10dBm.

 

 

NOTE:

The Premodulation Filter and NSM assembly are used to convert User Digital Data and

 

clock signals into GMSK.

 

 

Outputs

To A27 DAC/Upconverter

 

NSM_IF_CLK J2(1)

 

 

 

Frequency:

 

17.3333 MHz ± 250 Hz

 

 

 

Level:

 

TTL

 

 

 

The NSM_CLK signal can be sensed on the SERVICE Screen using the

’nsm_pmf_clk_pres_int_sense’ latch, a value of 1 for lock and ’0’ for OOL (Out Of Lock) state. An OOL condition can cause high phase and frequency error problems. See Figure 4-1 on page 12-12 for typical oscilloscope readings. On a Spectrum Analyzer, the peak marker should be >+6 dBm.

12-11

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Image 141
Agilent Technologies 8922 manual Pmfdata J11, MHz Ref B J233, Nsmifclk J21

8922 specifications

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