Shure PG4 User manual

PG4 Wireless Reciever Service Manual
©2006 Shure Incorporated
25A1104(Rev.1)
25A1104
PG4 WIRELESS RECEIVER
PRODUCT DESCRIPTION
The Shure Model PG4 is a dual conversion super heterodyne, predictive diversity, microprocessor-con-
trolled UHF receiver, operating over the frequency range of 536 MHz to 865 MHz. Power is supplied to
the receiver by external dc supply with country specific approvals. The PG series is Shure's most basic,
lowest price tier, frequency agile wireless series. This product is intended for use in low cost entry-level
presentation and amateur performance markets.
FEATURES
Frequency agility across a wide range of frequencies (up to 12 MHz for USA models) allows flexibility
to the user to continue wireless operation as the wireless spectral landscape continues to change.
• ·Predictive Diversity provides RF reliability
• ·One seven-segment LED display on the receiver to display channel.
User interface operations include:
• ·Channel Select
Functions include:
• ·RF Ready Light (green LED)
• ·Bi-color LED for audio presence/peak
• ·Fixed volume audio outputs
• ·XLR and ¼" audio outputs
• ·Fixed internal Receiver Antennas

2
25A1104 (Rev.1)
DETAILED DESCRIPTION
Front Panel
1audio LED
Indicates strength of incoming audio signal: green for normal, amber for strong, red for peak.
2ready LED
Green light indicates system is ready for use.
3 LED screen
4channel button
Back Panel
1 AC adapter jack
2 Adapter cord tie-off
3 XLR balanced microphone output jack
4 1/4” unbalanced output jack
123 4
34
2
1

3
25A1104 (Rev.1)
CIRCUIT DESCRIPTION
General block diagram description.
The receiver consists of the following components: Image filters, predictive diversity circuitry, down-converter, first IF strip, SAW filter,
second mixer, second IF strip, ceramic filter, detector, RSSI buffer, low pass filter, RMS detector and expander, mute circuit, balanced and
unbalanced audio outputs, tonekey detection circuit, noise squelch circuit, microprocessor and several voltage regulators. The PG4 receiver
has two internal antennas mounted to the circuit board via antenna connectors..
RF Strip
The receiver incorporates Shure's patented Predictive Diversity scheme. The microprocessor's A/D input is continuously monitoring buff-
ered RSSI output from the TP_RSSI_A2D test point. It uses a dynamically adaptive threshold to control dual PIN diode D510, to switch
between the internal antennas. The received RF signal enters an image rejection helical filter (FL510). The filter FL510 in conjunction with
a discrete filter post LNA attenuates the 1st LO frequency from reaching the antenna ports. The RF signal is then down-converted with
IC520, an integrated receiver front-end chip that includes: LNA (low noise amplifier), a GaAs FET mixer, and an IF buffer stage. The 50-
Ohm impedance of the mixer output's buffer stage is matched to the SAW filter FL600. The signal enters the 1st first IF amplifier, which
consists of Q603, and then it is filtered via a secondary LC filter comprised of C533, L523, C607, and C608. The second mixer is part of
IC610, which also contains the 2nd IF amplifier, limiter, FM detector, and wide dynamic range RSSI circuitry. The second mixer down-con-
verts the first IF signal (110.6 MHz) down to the second IF frequency of 10.7 MHz. The second IF signal is filtered with 10.7MHz ceramic
filters FL620 and FL625 and then demodulated with IC610 and quadrature coil L610. The audio output from the detector chip is injected to
an adjustable audio gain stage and also to the noise squelch stage. The RSSI output from the detector chip is connected to an input of the
A/D converter of the microprocessor for control of the predictive diversity circuit.
Buffer
LNA 1
st
MIXER
Helical
Filter
HPF for
lowside
injected
1st LO
LPF for
highside
injected
1st LO
1
st
LO LPF
VCO
From µP
Controller
Internal Antenna A
A
Internal Antenna B
Predictive Diversity
From
microcontroller
PIN
Diode
Switch
To SAW
filter

4
25A1104 (Rev.1)
The first, the second VCO's and PLL
The first VCO is a two-stage design composed of an oscillator stage and a buffer stage. Its frequency is controlled with the synthesizer
chip IC1. The first stage (Q724) is a common emitter Colpitts oscillator. The air wound resonator L720 is coupled to the transistor with C723,
and to the modulation varactor diode by C721. Inductor L720, capacitor C720, and trimmer CV720 form the resonant tank. Trimmer capac-
itor CV720 sets the VCO tuning voltage. It is used to tune out parts tolerances and process variances to insure adequate VCO frequency
coverage. The buffer stage Q712 is a common emitter stage. It has a resonant tank at the collector that consists of L710, C730, and part
of the capacitance of C729. The latter also forms an impedance matching network to match to the 50 Ohm input impedance of the low pass
filter. The local oscillator signal is then divided into the mixer injection path C522, and the synthesizer path R706, R717 and C716. The
second local oscillator consists of a single stage Colpitts oscillator (Q760). The second LO resonant tank consists of L756 and C756, and
is coupled via C755 to the varactor diode D755 that receives a control voltage from the phase locked loop. Capacitor C758 couples the tank
to the oscillator. The output tank and matching capacitors C762 and C763, provide 2nd LO output to the PLL chip, and via low pass filter
C763, L763, C765, to the second mixer. The synthesizer chip IC1 is a dual synthesizer that consists of two dual modulus prescalers, two
separate high-resolution synthesizers, a reference crystal divider, and charge pumps with selectable current levels. Y707 a 16 MHz crystal
maintains the frequency reference for the PLL.
DC Power Supply Section
ThereceiverworkswithaPS20powersupplythatisconnectedtoCON400. Diode D400 providesreversepolarityprotection. RF chokes;
E398, E400, E399 and E401 provide RF isolation between the power supply and the receiver. IC400 is the first voltage regulator stepping
down the PS20's unregulated voltage to a constant, low ripple, 9V DC voltage used by the audio section of the receiver. The 9 V is then
down regulated to 5V with IC401, to be used in the RF sections. The regulated 5V is then down regulated to 3.3V with (IC430) and used for
the digital circuit blocks and pin diode switching.
Audio Section
The audio travels from the FM detector output (IC610 pin 7) to an adjustable gain stage (IC200-4) which is used to exactly match the
audio level seen by the expander to that seen by the compressor in the transmitter. In parallel with this, a second path enters a trim stage
(IC200-2) and a high-pass filter (IC200-3). This makes up the noise detection circuit. The filtered signal is rectified and averaged. The
resulting dc is sent to the micro-controller (NOISE_A2D, TP_N) for squelch control.
The output of IC200-4 is then split into two paths. The first path enters a crystal filter (Y285) used for tone key detection. The filtered
signal is rectified and averaged. The resulting dc is sent to the micro-controller (TONEKEY_A2D, TP_TK) for tone key detection. The sec-
ond path (main audio path) connects to a low-pass filter (IC200-1), used to protect the RMS detector from high frequency tone-key and RF
noise. This filter is in combination with a secondary audio muting circuit (Q113) that increases the muting ability of the receiver with rail-to-
rail noise present.
The audio then splits down two paths: the RMS detector and the VCA.
The RMS detector produces a DC voltage that varies 6mV per dB of input signal. The detector output is fed to the expansion threshold
stage (IC260-3). This stage provides the transition from compressed to uncompressed signal. At low levels, the audio is not expanded
because D134 is turned off. As the AC level increases, the output of IC260-3 decreases enough to turn the diode on. As D134 conducts,
the compression ratio changes from 1:1 to 1:5. Once D134 is turned fully on, the audio expansion ratio remains fixed at 1:5. An additional
diode in the bias network (D122) provides temperature compensation for changes in the Vy, or "cut-in" voltage of D134. After the expansion
threshold stage, the DC control signal is attenuated by a buffer stage (IC260-4). This DC voltage is fed to the VCA control port Ec+. Ec- is
fed the VREF voltage. Together these voltages determine the gain of the expander. The audio exiting the VCA is amplified by IC260-2, and
travels via the de-emphasis circuitry to the outputs.
The audio peak level is determined by comparing the DC level at the output of the expansion threshold stage (AUDIO_A2D) to VREF.
The signal then enters the balanced and unbalanced output stages. The balanced output is set for mic level, where mic level is 14dB
down from line level.

5
25A1104 (Rev.1)
RF & AUDIO BLOCK DIAGRAM
From µP Controller
A
udio & Muting Circuitry
Audio Proc Muting
Unbalanced
Balanced
18 kHz LPF
Tone Key
Detector
N
oise
Squelch
Detector
To uP
To uP
Buffer
Audio
Outputs
Buffer
Buffer 2nd
MIXER
110 MHz
SAW Filter
2
nd
LO
VCO
Sanyo
LA8662V
2nd IF/Detector
10.7 MHz
LMX2335
LTM PLL
From
1
st
Mixer
To uP
Buffer and
DC gain
LPF
10.7 MHz
ceramic filters
Audio
output RSSI
output
R
F – 1
st
and 2nd IF
2nd mixer and detector

6
25A1104 (Rev.1)
Digital Section
The Freescale 8Kb FLASH microprocessor was chosen to maximize its benefits and to reduce system cost. The internal ADC converters
are utilized to sample DC voltages to handle switching diversity, audio metering, audio muting, noise squelching, and tone-key detection.
RF band detection uses four digital inputs. In addition, the Freescale microprocessor controls the 7-segment LED display and handles the
user interface channel selection.
Display Circuitry
1 Software Version
To verify which software version is loaded, use the following procedure:
Hold the select button while plugging in the device. While continuing to hold the select button down, the display should start flashing and
sequentially read out a repeating message similar to this one:
"b01-15-12c0-34c0"
This can be decoded as follows:
b:this is a receiver software load. (a indicates a transmitter load)
01-:major version number.
15-minor version number.
12c0-software audio trim level
34c0-software predictive diversity rssi trim level
ACCESSING DIFFERENT MODES
NORMAL MODE
UNDER USUAL USAGE CONDITIONS, THE DEVICE WILL POWER ON IN NORMAL MODE. BENCH TESTING SHOULD NOT BE DONE IN
NORMAL MODE. SINCE THE ATE MODE PROVIDES A SPECIAL FREQUENCY MAP, THE FREQUENCIES WILL BE DIFFERENT IN
NORMAL MODE.
ATE MODE
A Microwire serial bus using three pins, TP_ATELE, TP_ATEDATA, and TP_ATECLK will control the ATE mode. This interface can be
used to control and test all microprocessor-based functions of the board.
These ATE frequencies are shown in Table 1
Table 1
1, 2, 3 b, c, d
ATE Mode Test
Frequencies (MHz) H7 K7 M7 M10 P11 Q11 R10 R11 R12 JB T10
1 Flow b 536.000 589.500 662.000 674.000 702.000 740.000 799.700 770.000 794.000 806.000 854.000
2 Fmid c 542.000 594.500 668.000 681.500 708.000 746.000 806.000 777.000 799.700 808.000 859.500
PG4
3 Fhigh d 548.000 602.000 674.000 686.000 714.000 751.700 812.000 781.700 806.000 809.850 864.800

7
25A1104 (Rev.1)
RF BAND RESISTORS
Four resistors Ra, Rb, Rc, and Rd are responsible to start the microcontroller in a RF band.
Table 2 shows the reference designators and how the voltages at the test points reflect the operating RF band.
.
Table 3 shows the variant resistor installation options for each band. When a resistor is installed the microprocessor will read a logic low,
otherwise it will read a logic high..
Table 2
PG4 Reference Designators
Rd Rc Rb Ra
R316 R315 R314 R313
Table 3
RF BAND Board ID Rd Rc Rb Ra
H7 A
K7 B Installed
M7 C Installed
M10 D Installed Installed
P11 E Installed
Q11 F Installed Installed
R10 G Installed Installed
R11 H Installed Installed Installed
R12 J Installed
JB K Installed Installed
T10 L Installed Installed
Reserved M Installed Installed Installed
Reserved N Installed Installed

8
25A1104 (Rev.1)
Microcontroller Netnames and Programming Testpoint List
Pin Port Name Testpoint
1 RESETn Reset TP_RST
2 PTC0/TxD2 Seven Segment A
3 PTC1/RxD2 Seven Segment B
4 PTC2/SDA1 Seven Segment C
5 PTC3/SCL1 Seven Segment D
6 PTC4 Seven Segment E
7 PTC5 Seven Segment F
8 PTC6 Seven Segment G
9 PTC7 NC
10 PTE0/TxD1 Select Button
11 PTE1/RxD1 NC
12 IRQ NC
13 PTE2/SS1n Ra
14 PTE3/MISO1 Rb
15 PTE4/MOSI1 Rc
16 PTE5/SPSCK1 Rd
17 VSS1 EGND
18 VSS2 EGND
19 VDD +3.3Vdd
20 PTD0/TPM1CH0 RF LED
21 PTD1/TPM1CH1 Red LED (Active High)
22 PTD2/TPM1CH2Green LED (Active High)
23 PTD3/TPM2CH0 ANT_A
24 PTD4/TPM2CH1 ANT_B
25 PTB0/AD1P0 NOISE_A2D
26 PTB1/AD1P1 TONEKEY_A2D
27 PTB2/AD1P2 RSSI_A2D
28 PTB3/AD1P3 AUDIO_A2D
29 PTB4/AD1P4 NC
30 PTB5/AD1P5 NC
31 PTB6/AD1P6 NC
32 PTB7/AD1P7 NC
33 VREFH +3.3Vdd
34 VREFL EGND
35 PTA0/nKBI1P0 CLOCK
36 PTA1/nKBI1P1 DATA
37 PTA2/nKBI1P2 LE
38 PTA3/nKBI1P3 AUDIO_MUTE
39 PTA4/nKBI1P4 NC
40 PTA5/nKBI1P5 TP_ATECLK
41 PTA6/nKBI1P6 TP_ATEDATA
42 PTA7/nKBI1P7 TP_ATELE
43 VDDAD +3.3Vdd
44 VSSAD EGND
45 PTG0/BKGD/MS TP_BKGD
46 PTG1/XTAL Crystal
47 PTG2/EXTAL Crystal
48 PTG3 PLL_LD

9
25A1104 (Rev.1)
The microprocessor reads the RSSI level from an ADC several times a second when the PG4 is unmuted, to predict if a switch is neces-
sary to avoid an audible dropout. Thresholds were calculated from the above RSSI curve.
PG4 RSSI Curve
0.5
1
1.5
2
2.5
-120 -110 -100 -90 -80 -70-60 -50 -40-30 -20
RF Level
TP_RSSI Vdc
Series1

10
25A1104 (Rev.1)
NOTES

11
25A1104 (Rev.1)
FUNCTIONAL TEST
GENERAL INFORMATION LOOKUP TABLE
REQUIRED TEST EQUIPMENT (OR APPROVED EQUIVALENT OR SUPERIOR MODELS):
LISTENING TEST
Before completely disassembling the receiver, operate it to determine whether it is functioning normally and try to duplicate
the reported malfunction. Refer to pages 2 and 3 for operating instructions, troubleshooting, and specifications.
Review any customer complaint or request, and focus the listening test on any reported problem. The following, more ex-
tensive, functional tests require partial disassembly.
FUNCTIONAL TEST
NOTE: for these tests a tonekey generator must be used. If none is available, the unit must be opened and the tone
key must be disabled.
1. Apply +12 Vdc to the power input of the receiver (PS20).
2. Set up the Audio Analyzer as follows:
• Engage A-weighting filter
• Engage 30kHz LPF filter
3. Set up RF signal generator as follows:
• Frequency = F o (refer to the frequency tables on page 21)
• Amplitude = 0 dBm radiated
• FMrate = 1kHz
• Deviation = (see table next page)
RF Signal Generator Agilent E4420B
Audio Analyzer HP 8903B
Power Supply PS20
BNC (M) to BNC (M) cable (2) Shure PT1838A
BNC (F) to 1/4” adapter Shure PT1838C
Matching UA820 Antenna Frequency
Dependent
Band Low High Low High 1st LO 2nd LO
H7 536 548 757.2 769.2 Fc+110.6 99.9MHz
K7 590 602 811.2 823.2 Fc+110.6 99.9MHz
M7 662 674 883.2 895.2 Fc+110.6 99.9MHz
M10 674 686 895.2 907.2 Fc+110.6 99.9MHz
P11 702 714 480.8 492.8 Fc-110.6 121.3MHz
Q11 740 752 518.8 530.8 Fc-110.6 121.3MHz
R11 770 782 548.8 560.8 Fc-110.6 121.3MHz
R12 794 806 572.8 584.8 Fc-110.6 121.3MHz
R10 800 812 578.8 590.8 Fc-110.6 121.3MHz
JB 806 810 584.8 588.8 Fc-110.6 121.3MHz
T10 854 865 632.8 643.8 Fc-110.6 121.3MHz
Fc (MHz) 1st Image Band (MHz) Local oscillators

12
25A1104 (Rev.1)
TONE KEY INDICATOR
1. Modulate the RF signal with 32.768 kHz tone key generator. (If using an HP E4400B RF Generator use the Dual-
Sine wave feature by pressing: more, FM Waveform (Sine), and Dual-Sine). Set the following:
• FM Tone 2 Rate = 32.768kHz
• FM Tone 2 Amplitude = (see table below)
2. Connect an antenna to the RF signal generator output.
3. Verify that the 1kHz tone audio output is audible and the red "peak" LED is lit on the receiver.
AUDIO OUTPUT LEVEL AND DISTORTION
1. Attach audio analyzer to ¼" output and measure output level to be -3.3dBu +/- 2.5dB.
2. Measure Audio output of XLR to be -17.0dBu +/- 1.5dB.
3. Engage the A-weighting and 30 kHz LP filters on the HP8903.
4. Measure distortion to be less than 1%.
FREQUENCY RESPONSE USING AN RF GENERATOR.
1. Disengage all filters on the audio analyzer.
2. Set the audio analyzer to measure AC level in dB’s.
3. Connect the audio analyzer input to the ¼" output of the receiver.
4. Record this level by engaging the “ratio” button on the audio analyzer.
5. Change modulation to 20kHz on the RF generator.
6. Measure ¼" output to be -21dBu +/- 3dB.
7. Change modulated frequency on the RF generator to 400Hz.
8. The audio output level should be +5dB ± 1dB relative to the 1kHz level.
RF POWER AND SQUELCH LEVEL
1. Disengage the “ratio” button on the audio analyzer.
2. Change modulated frequency on the RF signal generator to 1kHz.
3. Engage the 400Hz filter and 30kHz filter on the audio analyzer.
4. Set RF level to -110 dBm. The Receiver should be squelched.
IF ALL TESTS PASSED, THIS MEANS THE UNIT IS PROPERLY FUNCTIONING, AND NO ALIGNMENT IS REQUIRED.
Deviation
Q11 All other frequencies
27.5 kHz 37.5 kHz
FM Tone 2 Amplitude
Q11 All other frequencies
16% 12%

13
25A1104 (Rev.1)
ASSEMBLY AND DISASSEMBLY
ASSEMBLY INSTRUCTIONS (REVERSE FOR DISASSEMBLY)
1.
2.
!CAUTION!
Observe precautions when handling this static-sensitive device.
REF LOW BAND ANTENNA
REF LOW BAND ANTENNA
(MORE TRIANGULAR SHAPED)
(MORE TRIANGULAR SHAPED)
ANTENNA SIDE CLIPS
ANTENNA SIDE CLIPS
NOTE 6
NOTE 6
REF HIGH BAND ANTENNA
REF HIGH BAND ANTENNA
(MORE SQUARE SHAPED)
(MORE SQUARE SHAPED)
REF: ANTENNAS SHOWN
REF: ANTENNAS SHOWN
SUPERIMPOSED TO SHOW
SUPERIMPOSED TO SHOW
DIFFERENT POSITIONS
DIFFERENT POSITIONS
AND GEOMETRIES.
AND GEOMETRIES.

14
25A1104 (Rev.1)
3.
REF HIGH BAND
REF HIGH BAND
LEFT
LEFT
REF LOW BAND
REF LOW BAND
LEFT
LEFT
REF LOW BAND, RIGHT
REF LOW BAND, RIGHT
REF HIGH BAND, RIGHT
REF HIGH BAND, RIGHT
2-ISOMETRIC
2-ISOMETRIC

15
25A1104 (Rev.1)
SERVICE PROCEDURES
MEASUREMENT REFERENCE
NOTE: Audio levels in dBu are marked as dBm on the HP8903.
REQUIRED TEST EQUIPMENT (OR APPROVED EQUIVALENT OR SUPERIOR MODELS):
dB Conversion Chart
0dBV = 2.2 dBu
0dBu = 0dBm assuming the load = 600 ohms
Be aware that dBu is a measure of voltage and dBm
is a measure of power. The HP8903, for example,
should be labeled dBu instead of dBm since it is a
voltage measurement. These two terms are often
used interchangeably even though they have
different meanings.
RF Generator Agilent E4400B
Digital multi-meter Fluke 87
Audio Analyzer HP 8903B
1 GHz Frequency Counter HP 53181A
Spectrum Analyzer HP 8591A
Power Supply PS20
Shielded Test Lead Shure PT1838F
BNC (M) to BNC (M) cable (2) Shure PT1838A
BNC (F) to ¼" adapter Shure PT1838C
BNC (M) to unterminated Shure PT1824
Matching PG1/PG2 Transmitter PG1/PG2
XLR (F) to Banana Plug Adapter Shure PT1841
Toray non-inductive tuning tool - White Shure PT1838M
Toray non-inductive tuning tool - Blue Shure PT1838K
Toray non-inductive tuning tool - Pink Shure PT1838L
Non-inductive hex tuning tool Shure PT1838N
Jumper wires

16
25A1104 (Rev.1)
ALIGNMENT AND MEASUREMENT PROCEDURE
General notes
The following procedures are intended for a "bench" testing environment only.
The alignment procedure is sequential and does not change unless specified. Use an RG-178/U BNC male to unterminated cable for all
RF connections to the antenna inputs. Keep the test cables as short as possible (less than 3 feet in length). Include the insertion loss of the
cables and the connectors when performing all RF measurements. DC voltages may present at RF test points. Use DC blocks to protect
the test equipment, if necessary.
.
VOLTAGE REGULATION CHECK
With power applied properly, and the unit switched on, measure the DC voltages at the following test points. All test points are located
on the top side of the PCB. Refere to the component diagram.
ATE MODE SETUP AND USE
There are three different ATE mode test frequencies available in every frequency group, which are Flow, Fmid and Fhigh. The Fmid
frequency may not be the center of the band. It is selected for the best tuning of FL510 filter. Set the receiver into ATE mode by shorting
"ATE LE" to GND and then apply power to the receiver's DC jack. Press the channel button until you observe the 7-segment LED display
providing a selection of 1, 2, 3 for frequency groups H7,K7, M7, M10 and b, C, d for frequency groups P11, Q11, R11, R12, R10, JB, T10.
For example, when the 7-segment LED display's a "1" this is Flow, "2" is Fmid and "3" Fhigh. When you depress the channel button for
approximately 3-seconds the receiver enters into a micro controller reference level programming mode. When a "C" is displayed, press and
release the channel button several times so you can observe the 7-segment LED display providing a selection of a blinking C, A or P. The
"C" is to cancel the micro controller reference level-programming mode (do not confuse this "C" for Fmid for groups P11, Q11, R11, R12,
R10, JB, T10). The "A" is to set the audio LED reference level. The "P" is to set the predictive no switch level. Once the respective C, A or
P is selected and left blinking, the micro will perform the respective operation when the 7-segment LED display returns to the previous 1, 2
or 3 display.
INITIAL SETUP
Disabling diversity: For Channel A to be active, short TP2 to ground and connect TP3 to 3.3Vdc. For Channel B to be active, short TP3
to ground and connect TP2 to 3.3Vdc.
Set the receiver into ATE mode and to Fhigh. This sets the receiver to the highest operating frequency.(see table 4 for reference)
Test Points Voltages
TP_9V +9.0 ± 0.2 Vdc
TP_5V +5.0 ± 0.1 Vdc
TP_5VPLL +5.0 ± 0.2 Vdc
TP_3.3V +3.3 ± 0.2 Vdc
TP_VREF +4.5 ± 0.2 Vdc
Table 4
1, 2, 3 b, c, d
ATE Mode Test
Frequencies (MHz) H7 K7 M7 M10 P11 Q11 R10 R11 R12 JB T10
1 Flow b 536.000 589.500 662.000 674.000 702.000 740.000 799.700 770.000 794.000 806.000 854.000
2 Fmid c 542.000 594.500 668.000 681.500 708.000 746.000 806.000 777.000 799.700 808.000 859.500
PG4
3 Fhigh d 548.000 602.000 674.000 686.000 714.000 751.700 812.000 781.700 806.000 809.850 864.800

17
25A1104 (Rev.1)
POWER TEST SECTION
1. Measure +9.0 Vdc + 0.2 /-0.2 Vdc at test point "TP_9V"
2. Measure +5.0 Vdc + 0.1 /-0.1 Vdc at test point "TP_5V"
3. Measure +5.0 Vdc + 0.2 /-0.2 Vdc at test point "TP_5VPLL"
4. Measure +3.3 Vdc + 0.2 /-0.2 Vdc at test point "TP3.3V"
5. Measure +4.5 Vdc + 0.2 /-0.2 Vdc at test point "TP_VREF"
6. The dc current drain should be 120 mA +/- 25 mA.
1ST LOCAL OSCILLATOR
1. Adjust CV720 to set voltage at TP1 to +3.75 Vdc ± 0.1 Vdc.
2. Attach a frequency counter to TP600. Verify frequency is:
(fo + 110.6 MHz) ± 5.0 kHz for frequency groups H7,K7, M7, M10
(fo - 110.6 MHz) ± 5.0 kHz for frequency groups P11, Q11, R11, R12, R10, JB, T10
2ND LOCAL OSCILLATOR
1. Verify the voltage at TP750 is between +1Vdc and +4Vdc
FRONT END RF FILTERS
1. Connect the RF generator output via RF test cable to +CON500 and ground for Channel A input.
2. Set receiver to Fmid.
3. Connect TP2 to GND and TP3 to 3.3Vdc so as, to defeat diversity switching.
4. Set RF generator to the corresponding Fmid frequency and set the amplitude to -70 dBm with no modulation.
5. Connect DC voltmeter to TPRSSI_A2D (Pin 6 of IC610).
6. Measure the DC voltage at TPRSSI_A2D (Pin 6 of IC610) while tuning FL510 so as to achieve the maximum DC voltage level at
TPRSSI_A2D.
PREDICTIVE DIVERSITY THRESHOLD SETTING
1. Set RF generator amplitude to -90 dBm. Enter into the micro controller reference level-programming mode. Sequence through the
three selections until the "P" is flashing. Let the "P" flash until it times out and the LED display returns to Fmid. This is to set the pre-
dictive no-switch level.
QUAD COIL TUNE-UP
1. Verify the receiver is set to ATE mode Fmid frequency.
2. For all groups except Q11 set the RF generator amplitude to -70 dBm with FM modulation at 1 kHz and deviation = 33 kHz with audio
analyzer HP8903B. Engage the A-weighting and 30 kHz LPF filters on the HP 8903B. Adjust L610 for maximum AC level at TPR (Pin
7 of IC610). Typically = 150mVrms. Low limit = 120mVrms. There is no high limit.
3. For Q11 only set the RF generator amplitude to -70 dBm with FM modulation at 1 kHz and deviation = 23 kHz with audio analyzer
HP8903B. Engage the A-weighting and 30 kHz LPF filters on the HP 8903B. Adjust L610 for maximum AC level at TPR (Pin 7 of
IC610). For the Q11 frequency band the low limit = 95mVrms. There is no high limit.
4. For all groups measure THD at TPR (Pin 7 of IC610). Typically = 0.5 %. If the THD is > 1.0%, adjust L610 again to minimize THD at
TPR.
CHANNEL A SENSITIVITY CHECK
1. Set RF generator amplitude to -100 dBm. Measure SINAD (Sinad = signal + noise + distortion/ noise + distortion) at TPR (Pin 7 of
IC610) to be greater then 12 dB.
2. Set receiver to ATE mode Flow frequency. Set RF generator frequency to corresponding frequency and the amplitude to -95 dBm.
Measure SINAD at TPR (Pin 7 of IC610) to be greater than 12dB, if not, go back to previous Front-end RF filter alignment section and
repeat the procedure.
3. Set the receiver to ATE mode Fhigh frequency. Set RF generator frequency to corresponding frequency and the amplitude to -95
dBm. Measure SINAD at TPR (Pin 7 of IC610) to be greater then 12 dB, if not, go back to previous Front-end RF filter alignment sec-
tion and repeat the procedure.
CHANNEL B SENSITIVITY CHECK
1. Set the receiver to ATE mode Fmid frequency.
2. Connect the RF generator to Ch. B (CON505 and ground).
3. Connect TP2 to 3.3Vdc and TP3 to GND so as, to defeat diversity switching.

18
25A1104 (Rev.1)
4. Set signal generator level= -100 dBm.
5. Set signal generator to corresponding frequency.
6. Measure SINAD at TPR (Pin 7 of IC610) to be equal to or greater than 12 dB.
TONEKEY LEVEL DETECTION
1. Verify the receiver is set to ATE mode Fmid frequency.
2. Set the RF generator's amplitude to -70dBm and carrier frequency to ATE Fmid frequency.
3. Apply a dual-sine modulation function with FM rate1=1KHz and FM rate2=32.768KHz and ampl=12%. Set the deviation to 37.5KHz.
For the Q11 band Apply a dual-sine modulation function with FM rate1=1KHz and FM rate2=32.768KHz and ampl=16%. Set the devi-
ation to 27.5KHz. Verify test point TP_TK measures between 1.00Vdc to 3.5 Vdc.
NOISE SQUELCH ALIGHNMENT
1. Verify the receiver is set to ATE mode Fmid frequency.
2. Verify RF generator is set to the ATE Fmid frequency a dual-sine modulation function with FM rate1 = 1KHz and FM rate2 =
32.768KHz and ampl=12%. Set the deviation to 37.5KHz. *For the Q11 band Apply a dual-sine modulation function with FM rate1 =
1KHz and FM rate2 = 32.768KHz and ampl=16%. Set the deviation to 27.5KHz. Set the RF signal generator amplitude to -95dBm.
3. Adjust the RF input level to find the 30dB SINAD point (A-weighted), measured at TPR. (note that the 30 dB SINAD at TPR corre-
sponds to approximately 40 dB SINAD at ¼" or XLR outputs).
4. Adjust TR220 for 1 Vdc ± 0.2Vdc at TP_N (Noise_A2D).
AUDIO ALIGNMENT
1. Verify RF generator is set to the ATE Fmid frequency a dual-sine modulation function with FM rate1 = 1KHz and FM rate2 = 32.768KHz and
ampl=12%. Set the deviation to 37.5KHz. *For the Q11 band Apply a dual-sine modulation function with FM rate1=1KHz and FM
rate2=32.768KHz and ampl=16%. Set the deviation to 27.5KHz.
2. Set the RF signal generator amplitude to -70dBm.
3. Adjust TR100 for -3.3dBu ± 0.25dBu at the ¼" output (TPUNBAL).
AUDIO PEAK LIGHT REFERENCE SETTING PROCEDURE
1. Apply a dual-sine modulation function with FM rate1 = 1KHz and FM rate2 = 32.768KHz and ampl=12%. Set the deviation to 47.0KHz.
2. Enter into the micro controller reference level-programming mode. Sequence through the three selections until the "A" is flashing. Let the "A"
flash until it times out and the LED display returns to Fmid. This is to set the audio LED peak light threshold.
The Alignment is now completed.

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25A1104 (Rev.1)
NOTES

20
25A1104 (Rev.1)
AGENCY APPROVALS
FCC DD4 PG4 (Part 15 "Declaration of Conformity" filed)
IC RSS-123 (Canada # 616A-PG4) Professional Only
CE (Declaration of Conformity to latest version of ETSI EN 301-389)
ADDITIONAL PRODUCT PERFORMANCE CHARACTERISTICS (NOT TESTED IN PRODUCTION):
General notes: A-weighting filter, RF testing level = -70 dBm, 33kHz Deviation @ 1 kHz modulation frequency, unless oth-
erwise specified.
Audio & RF tests at the detector output:
Audio level : 100 mV RMS min
S/N Ratio: 50 dB min. (60dB typical)
Frequency response: (100 Hz - 15 kHz) [+/-4.0 dB]
IF Bandwidth test at the detector output:
THD at fc+25 kHz: 2 % max.
THD at fc-25 kHz: 2 % max.
Image Response tests:
1st image rejection: 40 dB min. (50 dB typical)
2nd image rejection: 70 dB min.
½ first IF response test: 50 dB min.
2/3 first IF response test: 50 dB min.
½ 2nd IF test: 70 dB min.
2/3 2nd IF test: 70 dB min.
Response at Fo +/- digital clocks and their harmonics: 60 dB min.
Parasitic spurious: 50 dB min.
RF conductive tests:
First LO and its harmonics at the antenna port: -70 dBm max.
Second LO and its harmonics at the antenna port: -80 dBm max.
Overload test:
No receiver performance degradation should be observed at RF input levels up to -25 dBm. (THD, SINAD and S/N)
Intermodulation, THD, SINAD and S/N degradation is expected at RF input levels between
-20 to 6 dBm, however the receiver should receive the signal as expected.
Intermodulation tests:
Receiver's response to the 3rd and 5th order IM products outside of the bandwidth of the
second IF filters (e.g.: f (on channel) = 800MHz, F(IM1) = 801 MHz, F(IM2) = 802MHz) should be better than 50 dB.
Basic stability tests:
At the threshold of receiver's sensitivity, there should be no extraneous noises being generated within the receiver's circuit-
ry. There should be no parasitic oscillations present during tests with a spectrum analyzer along receiver's signal path (RF
band, 1st mixer, 1st IF, Second Mixer, Second IF, Detector, audio and noise circuitry).
RSSI tests:
RSSI total dynamic range: -100 to -60 dBm