Stryker SR-955HP - AM Mode Testing; AM Low Power Residual Amplitude Modulation; AM High Power Residual Amplitude Modulation; AM amplitude balance

Testing machine setup： TUNE MODE set as MANUAL，TUNE FREQ set on transmitting frequency，AF ANL IN set on
AM DEMOD。
AM output power：Choose channel 2，adjust to maximum power level, MIC short-circuited, adjust W11 to get power 15W±
0.5W，output power for channel 1 and channel 3 > 12W，current < 5.5A
AM low power：Choose channel 2，adjust to minimum power level, MIC short-circuited, to get power 0.5W-3W，current < 3A
AM High power modulation：Choose channel 2, adjust to maximum power level, input 1.25K 30MV signal to MIC, adjust V10,
the frequency deviation between 95%±5%，on channel 1 and channel 3 frequency deviation between
80-100%，PEP power > 50W，current <5.8A，W501 must in middle position，do not adjust it.
AM transmitting background noise：Choose channel 1、2、3，adjust to maximum power level，MIC short-circuited，the back
ground noise shall be < 1.5%。
Sensitivity：Choose channel2 ，send 1Ksignal to MIC，adjust machine output, when the frequency deviation is on 60%，the
audio output of testing machines shall between 1-3mV， SIND >26dB。
SNR：Choose channel 2，send a1K signal to MIC，adjust testing machine output . when the frequency deviation is on 60%，
SNR >40dB
Pre-emphasis：Choose channel 2，adjust to maximum power, send 1K signal to MIC，adjust testing machine output, when
frequency deviation is on 30%，fix this deviation point as 0 dB point，change modulation and testing:
0.3K：-2~1 0.5K：-2~1 1.5K：-2~1 2K：-2~1 2.50K：-2~1 3K：-6-~1 4K：-18-~13 5K：-26~-20
AM low Power residual amplitude modulation：Choose channel 1、2、3，adjust to minimum power，send 1K 30 mV signal
to MIC，when testing machine on FM，residual amplitude modulation need <1.2KHZ
AM High power residual amplitude modulation：Choose channel 1、2、3，adjust to maximum power，send 1K 30 mV signal
to MIC，when testing machine on FM，residual amplitude modulation need <1.2KHZ
AM amplitude balance
：
Choose channel 1
、
2
、
3
，
adjust to maximum power Spectrum CENTER frequency set same as testing
machine
，
band width at 10KHZ
，
REF LEVEL at 50 dB
，
send 1.25K
，
30 mV signal to MIC
，
Observe the Waveform symmetry
，
the Fluctuation shall not over 2 dB
。
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PA mode testing：
PA testing：Switch to PA mode，hold PTT，the speaker can not give out sound, connect a 8W 3R speaker to the PA port in the
rear of the radio，adjust VOL，the speaker will work.
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USB mode testing：
Balance adjust
：
choose channel 2
，
MIC short circuited
，
Spectrum CENTER frequency set same as testing channel
，
band width
at 10KHZ
，
AVG=5, REF LEVEL at 45 dB. Hold PTT, adjust W502 until the center frequency of the Spectrum reach minimum,
the value shall < -8dBm in USB or LSB mode.
Note：after testing，be sure to assemble the shield for L807.
USB high power and frequency error：Choose channel 2，adjust W6 to get 60W power，check if the frequency for the
modulation signal is 1KHZ±50HZ，check if the power on channel 1 and 3is over 55W，current
<10.5A，and SIND>30dB。（testing machine condition：MIC with 1K、30 mV signal，TUNE MODE:
MANUAL，TUNE FREQ: with testing frequency，AF ANL IN: SSB）