Stryker SR-955HP - User Manual

This document outlines the alignment procedures for the SR-955HP device, covering various operational modes and features. It serves as a guide for ensuring optimal performance and functionality of the radio.

General Instructions and Pre-Testing

Before commencing any adjustments, it is crucial to adhere to specific pre-testing guidelines. The device should be tested at a voltage of 13.8V. Maintaining the correct setup for the testing machine is essential to ensure accurate results. Users are cautioned against making any internal changes or parameter modifications without explicit instruction. Prior to final assembly, the factory mode must be deactivated using the factory software. After assembly, it is imperative to reset the radio to its factory default settings.

The document specifies frequency points for testing across Band A. For Channel 1, the receive frequency is 24.025 MHz and the transmit frequency is 24.105 MHz, with NB/ANL open. Channel 2 uses a receive frequency of 27.065 MHz and a transmit frequency of 27.100 MHz, also with NB/ANL open. Channel 3 is set to a receive frequency of 30.105 MHz and a transmit frequency of 30.095 MHz, with NB/ANL open.

VCO Testing and Initial Checks

VCO (Voltage Controlled Oscillator) testing is a critical step in the alignment process. A new radio will automatically reset upon power-on. However, a manual reset is required to ensure a full reset. This is achieved by holding the FUNC+SCAC+COLOR keys simultaneously while powering on the radio. The LCD will display "REST ALL" followed by "REST END," indicating a complete reset. A partial reset, where only FUNC is held during power-on, will display "RESET" on the LCD.

Initial checks include measuring the quiescent current. With the SQ (Squelch) turned off, in AM/FM/USB/LSB modes, the current should be less than 400mA. The LCD color should be RGB. To check the display, hold SCAN while powering on to verify both LCDs are functioning correctly.

The backlight LED is also checked. Upon power-on, repeatedly pressing the COLOR key should cycle through RED, GREEN, and BLUE colors, confirming the LED's proper operation before the LCD board is installed. Switching to the DIM position should display "DIM:31" on the large LCD. Adjusting the channel knob until the large LCD shows "DIM:OFF" allows for verification of the brightness changes, with smaller data resulting in a darker backlight.

Voltage verification involves navigating to the function menu, where "LCD: x x x" should be set to N&DC. The large LCD will then display the voltage. This voltage should be within ±0.10V of the supplied voltage. If there is a mismatch, the R521 560K resistance should be adjusted.

All keys and buttons on the full panel, including switches and knobs, must be checked for proper function, look, and touch. Finally, the radio needs to be programmed with the frequency points listed at the beginning of the instructions, and the factory mode must be canceled using the factory software.

VCO voltage testing involves checking TP510 and TP509. For TP510, the voltage should be between 1.0-4.0V across all frequency bands with no fluctuation. If this is not met, adjust the C801 8P capacitance. The capacitance tolerance is ±2P; if the issue persists, other problems should be investigated. For TP509, the voltage should be between 0.8-5.5V across all frequency bands with no fluctuation. If this is not met, adjust the C555 4P5 capacitance. The capacitance tolerance is ±2P; if the issue persists, other problems should be investigated. It is important to note that two VCOs are connected; if TP510 is unlocked during testing, TP509 will also be unlocked. TP509 can only be locked when TP510 is locked.

Frequency Adjustment

The frequency adjustment process begins by entering the testing mode. Hold the COLOR key while powering on. Use the FREQ control for rough adjustments and the CLAR external spindle for fine adjustments. The FUNC and COLOR keys are used to switch between different testing items.

VCO frequency adjustment involves testing point TP513 in FM mode. The CLAR inner spindle should be in the middle position, which is an easily identifiable fixed point. Before adjustment, power on the radio in USB mode for 2-5 minutes. For FRQ 320, adjust L807 to achieve a frequency of 38.695MHz ±10Hz with background noise less than 40Hz. For F05 XXX, adjust the frequency to 38.695MHz ±10Hz with background noise less than 40Hz. Turn the knob clockwise and anti-clockwise to its ends and test. The fluctuation should be within 500 ±100Hz. After testing, switch the knob to the middle position. For F15 XXX, the frequency should be 38.695MHz ±10Hz with background noise less than 40Hz. Turn the knob clockwise and anti-clockwise to its ends and test. The fluctuation should be within 1500 ±200Hz. After testing, switch the knob to the middle position. For F25 XXX, the frequency should be 38.695MHz ±10Hz with background noise less than 40Hz. Turn the knob clockwise and anti-clockwise to its ends and test. The fluctuation should be within 2500 ±300Hz. After testing, switch the knob to the middle position. Note that if the FRQ 320 data cannot be adjusted and the frequency fluctuation is less than 100Hz, an adjustment of ±70 is permissible. After testing the F05, F15, and F25 frequency fluctuations, ensure the CLAR inner spindle is in the middle position.

BFO (Beat Frequency Oscillator) frequency adjustment is performed by entering testing mode and selecting BFXX display, testing point TP301. In FM mode, the frequency should be 10.695MHz ±10Hz with background noise less than 40Hz. In USB mode, the frequency should be 10.6975MHz ±10Hz with background noise less than 40Hz. In LSB mode, the frequency should be 10.6925MHz ±10Hz with background noise less than 40Hz.

AFF (Automatic Fine Frequency) adjustment is done by entering testing mode, selecting AFFXXX display, testing point TP514. In FM mode, the frequency should be 10.240MHz ±40Hz with background noise less than 40Hz.

During alignment, it is important to choose the minimum deviated frequency, adjust carefully, and warm up the testing machine. If the deviation does not meet the standard, revise the C582 5P capacitance. The capacitance should be between 1-6P. If it is still not satisfactory, other indices should be checked. The final frequency is a combination of BFO and VCO frequencies. If the transmitting frequency is incorrect during testing, both frequencies must be rechecked. Due to the high accuracy requirement, adjust these two frequencies after the temperature stabilizes, especially if any soldering work has been done near the 10.24MHz and 10.6975MHz components. Y800, Y501, and Y500 must be grounded, and the housing of L807 and Y800 should be touched. After completing the alignment, install the shield over the two VCOs to ensure proper alignment.

TX Testing

For TX (Transmit) testing, the voltage should be 13.8V. The testing machine should have a filter with <20Hz HPF and 15KHz LPF, and DE-EMPHASIS should be OFF. Turning the power knob clockwise increases power, while turning it anti-clockwise reduces power. The power switch only functions in AM and FM modes. If the power output is excessively high, connect an attenuator to the testing machine.

For TX Voltage, when the FM power exceeds 50W (with current around 9A), the voltage should be 13V. For Switch location, all five Rocker Switches should be in the middle position, the CLAR inner spindle should be in the middle position, and MIC GAIN should be set to maximum.

Power Supply and Quiescent Current

In USB mode, switch the power to maximum and adjust W13 until the voltage in T9 is 12V ±0.1V. For Quiescent current in USB mode, switch the power to maximum and short-circuit the MIC. A. With J3 short-circuited (J4 open), hold PTT and adjust W8 until the current is minimum. Then, adjust W8 in the anti-direction until the current is 100mA over the minimum value. B. With J4 short-circuited (J3 open), hold PTT and adjust W9 until the current is minimum. Then, adjust W9 in the anti-direction until the current is 100mA over the minimum value. C. With J3 and J4 both open (no short-circuit jumper), hold PTT and adjust W7 until the current is minimum. Then, adjust W7 in the anti-direction until the current is 100mA over the minimum value. D. Test the transistors in the specified order. E. Ensure that all four transistors are installed under the same voltage.

Coil Adjustment and Intermediate-Frequency Transformer Adjustment

Before adjusting power, move L20 and L16 to their corresponding positions as per the sample. Install J3 and J4 jumpers. For Transmit intermediate-frequency transformer adjustment, select channel 3 in FM mode, set output power to maximum, and adjust T13 and T14 to achieve maximum output power. After completing this alignment, ensure the shield is installed over T13 and T14 to maintain proper alignment.

FM Mode Testing

The coil adjustment and transmit intermediate-frequency transformer adjustment procedures are repeated for FM mode testing, identical to the previous steps.

For FM High power, select channel 2, adjust output power to maximum, and adjust W14 to achieve 50W ±2W. The power on channels 1 and 3 should be greater than 40W, with a current less than 10A and a frequency of 50Hz. For FM low power, select channels 1, 2, and 3, adjust output power to minimum. The power should be between 0.5-3W, with a current less than 2.7A. For FM maximum deviation, select channel 2, send a 2K, 30mV signal to the MIC. Adjust MIC GAIN to maximum, then adjust W500 to achieve a frequency deviation between 3.5 ±0.2KHz. The deviation on channels 1 and 3 should be between 3-4.0 KHz. For FM transmitting background noise, select channels 1, 2, and 3, adjust output power to maximum, and short-circuit the MIC. The background noise should be less than 50Hz. For Power RSSI meter, select channel 2. For minimum power, 1-2 bars should be displayed. For 50W, 40-60 should be displayed. For SWR (Standing Wave Ratio), select channel 2, set output power to maximum, and adjust TC1 to achieve 2 bars for SWR. Then, reverse adjust to get just one bar. For Sensitivity, select channel 2, send a 1K signal to the MIC, and adjust machine output. When the frequency deviation is 1.5K, the audio output of the testing machine should be between 5-9mV, and SIND should be greater than 40dB. For SNR (Signal-to-Noise Ratio), select channel 2, send a 1K signal to the MIC, and adjust machine output. When the frequency deviation is 1.5K, SNR should be greater than 40dB. For Pre-emphasis, select channel 2, send a 1K signal to the MIC, and adjust the testing machine output. When the frequency deviation is 0.8K, fix this deviation point as 0 dB. Then, change modulation and test: 0.3K: -11~-9 0.5K: -6~-4 1.5K: 1~4 2K: 3~5 2.50K: 2~4 3K: -1~1 4K: -12~-9 5K: -20~-16 For FM signaling, enter test mode, select CTC/DCS channel, short-circuit the MIC, press PTT, adjust the frequency knob, and adjust CTC deviation to 0.35K. When testing CTCSS, the decode frequency for the testing machine should be ±0.5Hz of the radio channel. Adjust DCS deviation to 0.45K with smoothing waveform symmetry. When testing DCS, the decode signaling for the resting machine should be the same as the radio channel. For Transmitting RB, select channel 2, adjust output power to maximum, and send a 1KHz, 2S signal to check if the deviation is between 2.3-2.5K, with a frequency of 1KHz ±10Hz. For ECHO/MON testing, select channel 2, open the ECHO function, adjust VOL, DEL, MON to maximum. Hold PTT; you should hear your own voice from the speaker. Adjust MON; the voice will change. When MON is adjusted to the left end, MON is off, and you will not be able to hear your own voice from the speaker. For SWR testing, select channel 2, adjust output power to maximum, connect two parallel loads of 50R to the antenna connector. The SWR display should be ±2 bars when it is on 2.

AM Mode Testing

The testing machine setup for AM mode requires TUNE MODE to be set as MANUAL, TUNE FREQ to be set on the transmitting frequency, and AF ANL IN to be set on AM DEMOD.

For AM output power, select channel 2, adjust to maximum power level, and short-circuit the MIC. Adjust W11 to get 15W ±0.5W. The output power for channels 1 and 3 should be greater than 12W, with a current less than 5.5A. For AM low power, select channel 2, adjust to minimum power level, and short-circuit the MIC to get 0.5W-3W, with a current less than 3A. For AM High power modulation, select channel 2, adjust to maximum power level, and input a 1.25K 30MV signal to the MIC. Adjust V10 so that the frequency deviation is between 95% ±5%. On channels 1 and 3, the frequency deviation should be between 80-100%. The PEP power should be greater than 50W, current less than 5.8A. W501 must be in the middle position and should not be adjusted. For AM transmitting background noise, select channels 1, 2, and 3, adjust to maximum power level, and short-circuit the MIC. The background noise should be less than 1.5%. For Sensitivity, select channel 2, send a 1K signal to the MIC, and adjust machine output. When the frequency deviation is 60%, the audio output of the testing machine should be between 1-3mV, and SIND should be greater than 26dB. For SNR, select channel 2, send a 1K signal to the MIC, and adjust machine output. When the frequency deviation is 60%, SNR should be greater than 40dB. For Pre-emphasis, select channel 2, adjust to maximum power, send a 1K signal to the MIC, and adjust testing machine output. When the frequency deviation is 30%, fix this deviation point as 0 dB. Then, change modulation and test: 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 For AM low Power residual amplitude modulation, select channels 1, 2, and 3, adjust to minimum power, and send a 1K 30mV signal to the MIC. When testing the machine on FM, the residual amplitude modulation should be less than 1.2KHz. For AM High power residual amplitude modulation, select channels 1, 2, and 3, adjust to maximum power, and send a 1K 30mV signal to the MIC. When testing the machine on FM, the residual amplitude modulation should be less than 1.2KHz. For AM amplitude balance, select channels 1, 2, and 3, adjust to maximum power. Set the Spectrum CENTER frequency the same as the testing machine, with a bandwidth of 10KHz, REF LEVEL at 50 dB. Send a 1.25K, 30mV signal to the MIC. Observe the Waveform symmetry; the fluctuation should not exceed 2 dB.

PA Mode Testing

For PA testing, switch to PA mode and hold PTT. The speaker should not produce sound. Connect an 8W 3R speaker to the PA port at the rear of the radio. Adjust VOL; the speaker will then work.

USB Mode Testing

For Balance adjust, select channel 2, and short-circuit the MIC. Set the Spectrum CENTER frequency the same as the testing channel, with a bandwidth of 10KHz, AVG=5, REF LEVEL at 45 dB. Hold PTT and adjust W502 until the center frequency of the Spectrum reaches minimum. The value should be less than -8dBm in USB or LSB mode. After testing, ensure the shield for L807 is assembled.

For USB high power and frequency error, select channel 2, and adjust W6 to get 60W power. Check if the frequency for the modulation signal is 1KHz ±50Hz. Check if the power on channels 1 and 3 is over 55W, with a current less than 10.5A, and SIND greater than 30dB. (Testing machine condition: MIC with 1K, 30mV signal, TUNE MODE: MANUAL, TUNE FREQ: with testing frequency, AF ANL IN: SSB).

LSB Mode Testing

For LSB power and frequency error, check if the power on channels 1, 2, and 3 is over 55W, with a current less than 10.5A, and SIND greater than 30dB. Check if the modulation signal frequency is -1KHz ±50Hz. (Testing machine condition: MIC with 1K, 30mV signal, TUNE MODE: MANUAL, TUNE FREQ: with testing frequency, AF ANL IN: SSB). For LSB sensitivity, select channel 2, with MIC at 1K, 30mV signal. Turn power to 0, adjust MIC input value to get -3 dB. The present input value is the sensitivity, which should be between 0.8-2mV.

RX Testing

For RX (Receive) testing, turn the RF GAIN switch clockwise to increase gain and anti-clockwise to reduce gain. Turn the VOL switch clockwise to increase volume and anti-clockwise to reduce volume. NB/ANL function should be on. The SP should be loaded with an 8R 10W resistance. The testing machine filter should be <20Hz HPF and 15KHz LPF.

For High-level waveform, in AM or FM mode, RF GAIN should be at its highest. With antenna input, TP2 output, adjust T1, T2, T3. All waves should be correct and without self-collision. The margin should be -45 ±2 dB at testing point TP2. Testing machine settings: CONTROLS: ANT, CENTER FREQ: 27.065M, REF LEVEL: -30dB, SPAN: 20MHZ, TRACK, AMPLITUDE: -50 dB, RORT: RF OUT.

SSB Mode

For USB sensitivity, choose channel 2. When SP reaches its highest value, adjust T4, T5, T6, T7, T10 to maximize the margin of SP output. The SP margin should be greater than 1.0V, and SIND greater than 11dB (testing machine set on -121dB, frequency add 1k on main frequency, modulation off). For LSB sensitivity, choose channels 1, 2, and 3. SP output margin should be greater than 1.0V, and SIND greater than 11dB (testing machine set on -121dB, frequency add -1k on main frequency, modulation off). For RSSI meter, choose channel 2. Adjust W5 to set RSSI to -67dBm, so the meter is at the S9 position. On channels 1, 2, and 3, when RSSI is -5dBm, the meter should be full bar. At -110dBm, it should display 1-5 bars. For SQ deepest, choose channel 2. Turn the SQ switch to the right end. Adjust W3 to open the speaker at -27 ±2dBm. The SQ should open when the signal is -15dBm on channels 1, 2, and 3, and turn off at -40dBm. For SP maximum output margin, choose channel 2. When the SP is maximum, the margin should be 5.3V ±0.3V, with current less than 0.9A. Then, adjust SP to 2-3V. The SIND should be greater than 35dB (testing machine set on -47dBm, modulation off).

AM Mode

For AM sensitivity, choose channel 2. Adjust T12, T8, T9 to maximize SP output margin. The SP output on channels 1, 2, and 3 should be greater than 1.0V, and SIND greater than 8dB (testing machine set on -113dBm, 1k, 30%). For RSSI meter, choose channel 2, set gain to maximum. Adjust W4 to set the meter to the S9 position when it is -67dBm. When it is -5dBm, the meter should be full bar. When it is -113dBm, the meter should be 1-5 bars (testing machine set on: 1K 30%). For SQ deepest, choose channel 2. Turn the SQ switch to the right end. Adjust W2 to open the speaker at -27 ±2dBm. The SQ should open when the signal is -15dBm on channels 1, 2, and 3, and turn off at -40dBm (testing machine set on: 1K 30%). For SP maximum output margin, choose channel 2. When the SP is maximum, the margin should be 4.7V ±5.3V, with current less than 0.8A. Then, adjust SP to 2-3V. The SIND should be greater than 30dB, and SNR greater than 30dB (testing machine set on -47dBm, 1K 30%).

Further Adjustments and Testing

For AF sensitivity, choose channel 2. When the SP is maximum, the margin should be 2.7V ±3.3V (testing machine set on -47dBm, 1K 30%). For HI-CUT function, choose channel 2. When the SP is maximum, turn on the HI-CUT function. The SP output should reduce by 0.4V-0.7V (testing machine set on -113dBm, 1K 30%). Note: Turn off the Hi-cut function after this testing. For ANL function, choose channel 2. When the SP is maximum, turn off the ANL function. The SP output should increase by 0.8V-1.2V (testing machine set on -113dBm, 1K 30%). Note: Turn on the ANL function after this testing. For RF GAIN function, choose channel 2. Adjust RF GAIN to minimum. SIDN should be between 8-16dB (testing machine set on: -60dBm 1K 30%).

FM Mode

For FM sensitivity, choose channel 2. SP output margin should be between 2-3V. The SIND on channels 1, 2, and 3 should be greater than 11dB (testing machine set on: -119dBm 1K 1.2K). For SP maximum output margin, choose channel 2. When the SP is maximum, the margin should be 4.7V ±5.3V, with current less than 0.8A. Then, adjust SP to 2-3V. The SIND should be greater than 33dB, and SNR greater than 35dB (testing machine set on -47dBm, 1K 1.2K). For AF sensitivity, choose channel 2. When the SP is maximum, the margin should be between 3.0-3.6V (testing machine set on -47dBm, 1K 0.4K). For ASQ adjust, enter testing mode. Choose AQ ON to open at just -113dBm. Choose AQ OFF to turn off at just -116dBm. For ASQ testing, enter the function menu to turn on the ASQ function. The SQ should open at -113 ±3dBm on channels 1, 2, and 3, and turn off at -119dBm. Turn off the ASQ function after this testing. For CTCSS/DCS testing, in FM mode, cut OP1, OP2 point, and install the optional CTC board. Test the working of CTCSS and DCS decode (testing for the first sample only).

Stryker SR-955HP Specifications

General

Type	CB Radio
Channels	40
Weight	3.5 lbs
Antenna Impedance	50 Ohms
Power Supply	13.8V DC
Frequency Range	26.965 MHz - 27.405 MHz
Power Output	4W AM / 12W SSB
Modulation	AM/SSB
Dimensions	9.5 x 6.5 x 2.5 inches
Microphone	Dynamic
Features	ANL

Stryker SR-955HP - User Manual

Table of Contents

Summary

General Setup and Frequency Points

Note before testing

Frequency points for testing

VCO Testing

New radio reset

Check Quiescent Current

Check Display

Check Backlight LED

Check voltage

Check keys and buttons

Check programming

VCO voltage

Frequency Adjustment

Frequency adjustment

VCO frequency adjustment

BFO frequency adjustment

AFF frequency adjustment

TX Testing

Note on TX Testing

TX Voltage

Switch location

Power supply voltage

Quiescent current

Coil adjustment

Transmit IF Transformer Adjustment

FM Mode Testing

FM Signaling

Transmitting RB

ECHO, MON Testing

SWR Testing

AM Mode Testing

AM Low Power Residual Amplitude Modulation

AM High Power Residual Amplitude Modulation

AM amplitude balance

PA mode testing

USB high power and frequency error

RX Testing

USB sensitivity

LSB Mode Testing

LSB sensitivity

High-level waveform

SSB Mode

USB sensitivity (SSB)

LSB sensitivity (SSB)

RSSI meter (SSB)

SQ deepest (SSB)

SP maximum output margin (SSB)

AM Mode

AM sensitivity

AM RSSI meter

AM SQ deepest

AM SP maximum output margin

AF sensitivity (AM)

HI-CUT function

ANL function

RF GAIN function

FM Mode

FM sensitivity

SP maximum output margin (FM)

AF sensitivity (FM)

ASQ adjust

ASQ testing

CTCSS;DCS testing

Summary

General Setup and Frequency Points

Note before testing

Frequency points for testing

VCO Testing

New radio reset

Check Quiescent Current

Check Display

Check Backlight LED

Check voltage

Check keys and buttons

Check programming

VCO voltage

Frequency Adjustment