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Stryker SR-955HP - Frequency Adjustment; Frequency adjustment; VCO frequency adjustment; BFO frequency adjustment

Stryker SR-955HP
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Frequency adjustment
Enter testing modeHold COLOR to power onadjust FREQ for rough adjustCLAR external spindle for fine adjustFUNC
COLOR key are used to switch between testing items.
VCO frequency adjustment Testing point TP513 FM modeCLAR inner spindle in middle positionan Obviously fixed-point
can be find in middle pointbefore adjustment, power on radio in USB mode for 2-5 minutes.
Choose FRQ 320adjust L807frequency 38.695MHZ±10HZbackground noise < 40HZ
Choose F05 XXXadjust frequency 38.695MHZ±10HZbackground noise < 40HZ
Turn clockwise and anti clockwise to the end and test. the fluctuation need 500±100Hz, switch the knob
to middle position after testing.
Choose F15 XXX frequency need 38.695MHZ±10HZbackground noise < 40HZ
Turn clockwise and anti clockwise to the end and test. the fluctuation need 1500±200Hz, switch the knob
to middle position after testing.
Choose F25 XXX frequency need 38.695MHZ±10HZbackground noise < 40HZ
Turn clockwise and anti clockwise to the end and test. the fluctuation need 2500±300Hz, switch the knob
to middle position after testing.
NoteFRQ 320 data can not adjustedif the frequency fluctuation is <100HZyou can adjust ±70>
After testing FO5F15F25 frequency fluctuationbe sure to turn the CLAR inner spindle in middle position.
BFO frequency adjustmentEnter testing modechoose BFXX displaytesting point TP301
Choose FM modefrequency need 10.695MHZ±10HZbackground noise < 40HZ
Choose USB modefrequency need 10.6975MHZ±10HZbackground noise < 40HZ
Choose LSB modefrequency need 10.6925MHZ±10HZbackground noise < 40HZ
AFF frequency adjustmentEnter testing modechoose AFFXXX displaytesting point TP514
Choose FM modefrequency need 10.240MHZ±40HZbackground noise < 40HZ
Note1During alignmentchoose the minimum deviated frequency, do well adjust and warm up the testing machine.
If the deviation not meet standard, revise the C582 5P capacitanceCapacitance between 1-6Pif still not OKcheck
other index.
Note2T he final frequency are composed by BFO and VCO frequency, when the testing transmitting frequency is error, it is
necessary to recheck both frequency. Due to high requirement on accuracy, do adjust this 2 frequency after the
temperature turn normal if any soldering work near the 10.24MHZ, and 10.6975 MHz component. Y800, Y501,
Y500 must grounded, the housing of L807 and Y800 shall be touched. After finish above alignment, be sure to
install the shield over the 2 VCO to ensure rest alignment
TX testing
NoteVoltage 13.8Vtesting machine with filter20HZ HPF and 15KHZ LPFDEEMPHASIS is OFFClockwise turning
is for increase power, anti clockwise turning is for reduce low. The power switch only work for AM,FM mode.
If the power is too big, connect a Attenuator with testing machine.
TX VoltageWhen the FM power is over 50W 时(current around 9A), The voltage is 13V
Switch location All the 5 Rocker Switch fix in middle positionCLAR inner spindle fix in middle point MIC GAIN to
maximum