达人请进：关于GSM900的杂散测试如何进行？

跳跃音符

在对GSM900的传导杂散测试中，在接收频段（935~960M）协议要求是-79dBm，请问频谱仪这个时候该如何设置？
在中心频点62信道进行，已加200K的陷波器，将中心频点限制了70dB左右。手机最大功率发射，检波方式：MAX PEAK，最大保持（MAX HOLD)，测试值无法通过，一般都在-74dBm左右。RBW/VBW=100K/300K
请问达人这样设置是否正确，在协议中没有找到如何设置的条件，谢谢了。

henryYP

楼主看的是哪份协议？
传导杂散测试中接收频段935~960M的空闲模式的要求为-57dBm（3GPP TS51.010-1 version 5.7.0 Release 5 P152）;
另外从你的频谱仪的设置来看是没有问题的，能不能把你系统的整个构建方式描述一下？[br]<p align=right><font color=red>+1 RD币</font></p>

跳跃音符

P152是讲的传到杂散，但是没有讲传到杂散在接收段的要求，请参看P182里面有具体说明。

Table 13-10: Spurious emissions in the MS receive bands

关键是协议中没有找到频谱仪的检波方式该如何设置，所以用MAX PEAK检波是否正确呢？

如果用RMS检波，加大扫描时间是可以过的，但是不知道是否正确，谢谢。

wd0123

学习学习！有没有达人有相关的资料可以传一份给我吗，我的邮箱是2302004024@163.com

paoloday

1.1.           Wideband noise
(REC 51.010 § 13.4; REC 45.005 § 4.2.1)

Measurements under normal conditions


Resolution Bandwidth : 100 kHz
Video Bandwidth: 100 kHz
Span 0 Hz
Average over 50 bursts ; External Trigger
Middle channel at Pmax

Every ARFCN from FT 1800 kHz to the edge of the relevant transmit band
At 200 kHz intervals over the 2 MHz either side of the relevant transmit band

The spectrum generated by at least 40 of the bits from 87 to 132
of the burst is the only spectrum measured

The power reference for the measurements in dBc is mesured in a resolution bandwidth of 30kHz and a video bandwidth of 30 kHz.

1.1.1.      E-GSM

Power levels in dB relative to the measurement at FT
Power level
33 dBm1.8 to
3.0 MHz3.0 to
6.0 MHz> to
6.0 MHz
DBc- 63- 65- 71
mini dBm- 46- 46- 46
100 kHz / 100 kHz
Resolution bandwidth / Video bandwidth


1.1.2.      DCS and PCS

Power levels in dB relative to the measurement at FT
Power level
30 dBm1.8 to
6.0 MHz> to
6.0 MHz
DBc- 65- 73
mini dBm- 51- 51
100 kHz / 100 kHz
Resolution bandwidth / Video bandwidth


Exceptions :

Band From Ftx ± 1.8Mhz to Ftx ± 6 MHz :    3 exceptions below -36 dBm.

Band beyond 6 MHz :                           12 exceptions  below to -36 dBm.

1.2.           Spurious emissions in the MS receive band
(REC 51.010 § 13.4; REC 45.005 § 4.3)


Measurements :       under normal conditions
                With a notch filter centered on TX middle Frequency.               
Resolution bandwidth  : 100 kHz
Video bandwidth : 100 kHz
Span 0 Hz
Average over 50 bursts ; External trigger

Middle channel at Pmax

In band 925-960 MHz by step of 200 kHz
In band 1805-1880 MHz by step of 200 kHz
In band 1930-1990 MHz by step of 200 kHz

The spectrum generated by at least 40 of the bits from 87 to 132
of the burst is the only spectrum measured

BandFrequency band Level ( dBm)
E-GSM925 to 935 MHz-67
GSM & E-GSM935 to 960 MHz-79
DCS1805 to 1880 MHz-71
PCS1930 to 1990 MHz-71

Exception :

·         5 measurements in E-GSM band are allowed if the level is lower than -36 dBm

·         5 measurements in DCS band are allowed if the level is lower than -36 dBm

·         5 measurements in PCS band are allowed if the level is lower than -36 dBm

1.4.            Conducted spurious emmissions on communication mode outside of RX bands
(REC 51.010 § 12.1.1)

Measurements :      with a notch filter from 500 MHz
Under Temperature normal conditions
Under Supply normal and extreme conditions

The measurement on any frequency shall be performed for at least one TDMA frame period

Maximal Output Power
Free Run Trigger
Peak hold




1.4.1.       GSM_E  (Channel 62)
(Excluded near TX E-GSM, excluded RX E-GSM, DCS and PCS bands)
BandResolution bandwidthVideo bandwidthLimit (dBm)
100 kHz to 50 MHz10 kHz30 kHz-36
50 to 500 MHz100 kHz300 kHz-36
500 to 850 MHz3 MHz3 MHz-36
850 to 860 MHz1 MHz3 MHz-36
860 to 870 MHz300 kHz1 MHz-36
870 to 880 MHz100 kHz300 kHz-36
880 to 896.4 MHz100 kHz300 kHz-36
896.4 to 900.6 MHz30 kHz100 kHz-36
904.2 to 908.4 MHz30 kHz100 kHz-36
908.4 to 915 MHz100 kHz300 kHz-36
915 to 925 MHz100 kHz300 kHz-36
960 to 1000 MHz3 MHz3 MHz-36
1000 to 1805 MHz3 MHz3 MHz-30
1880 MHz to 1930 MHz3 MHz3 MHz-30
1990 MHz to 12.75 GHz3 MHz3 MHz-30

1.4.2.      DCS (Channel 698)
(Excluded near TX DCS ; excluded RX E-GSM, DCS and PCS bands)
BandResolution bandwidthVideo bandwidthLimit (dBm)
100 kHz to 50 MHz10 kHz30 kHz-36
50 to 500 MHz100 kHz300 kHz-36
500 to 925 MHz3 MHz3 MHz-36
960 to 1000 MHz3 MHz3 MHz-36
1000 to 1680 MHz3 MHz3 MHz-30
1680 to 1690 MHz1 MHz3 MHz-30
1690 to 1700 MHz300 kHz1 MHz-30
1700 to 1710 MHz100 kHz300 kHz-30
1710 to 1741.4 MHz100 kHz300 kHz-36
1741.4 to 1745.6 MHz30 kHz100 kHz-36
1749.2 to 1753.4 MHz30 kHz100 kHz-36
1753.4 to 1785 MHz100 kHz300 kHz-36
1785 to 1795 MHz100 kHz300 kHz-30
1795 to 1805 MHz300 kHz1 MHz-30
1880 MHz to 1930 MHz3 MHz3 MHz-30
1990 MHz to 12.75 GHz3 MHz3 MHz-30

1.4.3.       PCS (channel 661)
(Excluded near TX PCS ; excluded RX E-GSM, DCS and PCS bands)
BandResolution bandwidthVideo bandwidthLimit (dBm)
100 kHz to 50 MHz10 kHz30 kHz-36
50 to 500 MHz100 kHz300 kHz-36
500 to 925 MHz3 MHz3 MHz-36
960 to 1000 MHz3 MHz3 MHz-36
1000 to 1820 MHz3 MHz3 MHz-30
1820 to 1830 MHz1 MHz3 MHz-30
1830 to 1840 MHz300 kHz1 MHz-30
1840 to 1850 MHz100 kHz300 kHz-30
1850 to 1874 MHz100 kHz300 kHz-30
1874 to 1878.2 MHz30 kHz100 kHz-30
1881.8 to 1886 MHz30 kHz100 kHz-30
1886 to 1910 MHz100 kHz300 kHz-30
1910 to 1920 MHz100 kHz300 kHz-30
1920 to 1930 MHz300 kHz1 MHz-30
1990 MHz to 12.75 GHz3 MHz3 MHz-30


MS有点长...不好意思~~~~
[em01][em01][em01][em01][em01][em01][em01][em01]

paoloday

晕,贴上来表格都不见了,看着肯定挺累人的.我还是上传个文档吧[em10]

【文件名】:08227@52RD_宽带噪声 带内带外杂散.doc
【格　式】:doc
【大　小】:95K
【简　介】:
【目　录】:


[em08][em08][em08][em08][em08][em08][br]<p align=right><font color=red>+3 RD币</font></p>

bobzhao9988

12.1.2.5 Test requirement
The power of any spurious emission shall not exceed the levels given in table 12.6.
Table 12.6
Power level in dBm  Frequency range
GSM 400,
GSM 900,
DCS 1 800
GSM 700,  
GSM 850, PCS
1 900
100 kHz to  880 MHz  -57 -57
880 MHz to  915 MHz  -59 -57
915 MHz to  1 000 MHz  -57 -57
1 GHz to  1 710 MHz  -47  
1 710 MHz to  1 785 MHz  -53  
1 785 MHz to  12,75 GHz  -47  
1 GHz to  1 850 MHz   -47
1 850 MHz to  1 910 MHz   -53
1 910 MHz to  12,75 GHz   -47

lgc2000

楼主，传导杂散要求没那么高的，idel状态是-57dbm，通话状态是-36dbm，
你讲的Table 13-10: Spurious emissions in the MS receive bands是频谱的要求，
就我理解，应该是说RX band里面5个最高的点不超过-36dbm，其它的点不超过-79dbm。
When allocated a channel, the power emitted by a GSM 400, GSM 900 and DCS 1 800 MS, in the band
935 MHz to 960 MHz shall be no more than -79 dBm, in the band 925 MHz to 935 MHz shall be no more than -
67 dBm and in the band 1 805 MHz to 1 880 MHz shall be no more than -71 dBm except in five measurements
in each of the bands 925 MHz to 960 MHz and 1 805 MHz to 1 880 MHz where exceptions at up to -36 dBm are
permitted.[br]<p align=right><font color=red>+3 RD币</font></p>

paoloday

8楼正解


BandFrequency band Level ( dBm)
E-GSM925 to 935 MHz-67
GSM & E-GSM935 to 960 MHz-79
DCS1805 to 1880 MHz-71
PCS1930 to 1990 MHz-71

Exception :

·         5 measurements in E-GSM band are allowed if the level is lower than -36 dBm

·         5 measurements in DCS band are allowed if the level is lower than -36 dBm

·         5 measurements in PCS band are allowed if the level is lower than -36 dBm

跳跃音符

8楼的达人的意见很是赞同

但是现在我的测试情况是用MAX PEAK检波，MAX HOLD保持，RBW/VBW=100k/100k

只要手机发射到最大功率，整个底噪都上来了（小功率不会，用的FSU），不仅仅是5个点超标，有很多点。

5楼的测试方法是用于TDMA系统的，以前在PHS文档中有见过。但是并没有讲频谱仪如何设置。

现在的疑问是：

1，频谱仪的检波方式用什么？

2，Average over 50 bursts ; External Trigger
是否需要用外部Trigger，将CMU或者8960跟FSU同步起来，每次用TDMA帧来触发？

还请多指教,谢谢。

paoloday

检波方式: average
sweep count:  50次
trace:  external trigger
需要用外部trigger

说的不对还请大虾指正[em08]