Shure pg4 User Manual

PG4 WIRELESS RECEIVER

PRODUCT DESCRIPTION

The Shure Model PG4 is a dual conversion super heterodyne, predictive diversity, microprocessor-con­trolled 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.

PG4 Wireless Reciever Service Manual

25A1104

FEATURES

©2006 Shure Incorporated

25A1104(Rev.1)

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 wire less 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

DETAILED DESCRIPTION

Front Panel

1 audio LED

Indicates strength of incoming audio signal: green for normal, amber for strong, red for peak.

2 ready LED

Green light indicates system is ready for use.

3 LED screen
4 channel button

1

2

3 4

Back Panel

1

1 AC adapter jack
2 Adapter cord tie-off
3 XLR balanced microphone output jack
4 1/4” unbalanced output jack

2

3

4

25A1104 (Rev.1)

2

CIRCUIT DESCRIPTION

A

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..

Internal Antenna A

From
microcontroller

Helical
Filter

Predictive Diversity

PIN

Diode

Switch

LNA

LPF for
highside
injected

st

LO

1

Internal Antenna B

HPF for
lowside
injected

st

LO

1

st

1

MIXER

To SAW

filter

VCO

From µP
Controller

1

st

LO

Buffer

LPF

RF Strip

The receiver incorporates Shure's p atented Predict ive Diversity scheme. The microprocessor's A/D input is continuously monitoring buff­ered 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 50­Ohm 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-con­verts 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.

25A1104 (Rev.1)

3

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 capac­itor 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

The receiver works with a PS20 power supply that is connected to CON400. Diode D400 provides reverse polarity protection. 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 sec­ond 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-to­rail 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. T ogether 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.

25A1104 (Rev.1)

4

RF & AUDIO BLOCK DIAGRAM

A

N

R

From

st

1

Mixer

110 MHz

SAW Filter

nd

2

LO

Buffer

nd

2

MIXER

10.7 MHz
ceramic filters

2

Audio
output

nd

IF/Detector

10.7 MHz

Sanyo

LA8662V

Buffer and

DC gain

RSSI

output

To uP

VCO

LPF

F – 1st and 2nd IF

nd

mixer and detector

2

Audio

From µP Controller

LMX2335

LTM PLL

Outputs

Unbalanced

Buffer

Buffer

18 kHz LPF

Tone Key
Detector

udio & Muting Circuitry

Audio Proc Muting

To uP

oise
Squelch
Detector

Balanced

To uP

25A1104 (Rev.1)

5

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

ATE Mode Test

Frequencies (MHz)

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

H7 K7 M7 M10 P11 Q11 R10 R11 R12 JB T10

1, 2, 3 b, c, d

25A1104 (Rev.1)

6

RF BAND RESISTORS

Four resistors Ra, Rb, Rc, and Rd are responsible to start the microcontroller in a RF band.

Ta ble 2 shows the reference designators and how the voltages at the test points reflect the operating RF band.

.

Table 2

PG4 Reference Designators
Rd Rc Rb Ra

R316 R315 R314 R313

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 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

25A1104 (Rev.1)

7

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 S egment 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 Hi gh)

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

25A1104 (Rev.1)

8

2.5

PG4 RSSI Curve

2

1.5

1

TP_RSSI Vdc

Series1

0.5

0

-120

-110

100

-

-

90

-80

60

70

-

-

-50

4

-30

-

-20

RF Level

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.

25A1104 (Rev.1)

9

NOTES

25A1104 (Rev.1)

10

FUNCTIONAL TEST

GENERAL INFORMATION LOOKUP TABLE

REQUIRED TEST EQUIPMENT (OR APPROVED EQUIVALENT OR SUPERIOR MODELS):

Fc (MHz ) 1st Image B and (MHz) Loc al oscil l at ors

Band Low Hi gh 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 9 9.9MHz

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 77 0 782 548.8 560.8 Fc-110.6 121.3MHz
R12 79 4 806 572.8 584.8 Fc-110.6 121.3MHz
R10 80 0 812 578.8 590.8 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

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

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 reporte d 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 = Fo (refer to the frequency tables on page 21)

• Amplitude = 0 dBm radiated

• FMrate = 1kHz

• Deviation = (see table next page)

25A1104 (Rev.1)

11

Deviation

Q11

All other frequencies

27.5 kHz 37.5 kHz

TONE KEY INDICATOR

1. Modulate the RF signal with 32.768 kHz tone key generator. (If using an HP E4400B RF Generator use the Dual­Sine 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)

FM Tone 2 Amplitude

Q11

All other frequencies

16% 12%

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 “

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.

ratio” button on the audio analyzer.

25A1104 (Rev.1)

12

ASSEMBLY AND DISASSEMBLY

REF LOW BAND ANTENNA
(MORE TRIANGULAR SHAPED)

ANTENNA SIDE CLIPS
NOTE 6

REF HIGH BAND ANTENNA
(MORE SQUARE SHAPED)

REF: ANTENNAS SHOWN
SUPERIMPOSED TO SHOW
DIFFERENT POSITIONS
AND GEOMETRIES.

!CAUTION!

Observe precautions when handling this static-sensitive device.

ASSEMBLY INSTRUCTIONS (REVERSE FOR DISASSEMBLY)

1.

2.

REF: ANTENNAS SHOWN
SUPERIMPOSED TO SHOW
DIFFERENT POSITIONS
AND GEOMETRIES.

REF HIGH BAND ANTENNA
(MORE SQUARE SHAPED)

REF LOW BAND ANTENNA
(MORE TRIANGULAR SHAPED)

ANTENNA SIDE CLIPS
NOTE 6

25A1104 (Rev.1)

13

3.

REF HIGH BAND
LEFT

REF LOW BAND
LEFT

REF LOW BAND, RIGHT

REF HIGH BAND, RIGHT

2-ISOMETRIC

REF HIGH BAND
LEFT

REF LOW BAND
LEFT

REF LOW BAND, RIGHT

REF HIGH BAND, RIGHT

2-ISOMETRIC

25A1104 (Rev.1)

14

SERVICE PROCEDURES

MEASUREMENT REFERENCE

NOTE: Audio levels in dBu are marked as dBm on the HP8903.

dB Conversion Chart

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 tw o te rms are often

REQUIRED TEST EQUIPMENT (OR APPROVED EQUIVALENT OR SUPERIOR MODELS):

1 GHz Frequency Counter HP 53181A

BNC (M) to BNC (M) cable (2) Shure PT1838A

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

0dBu = 0dBm assuming the load = 600 ohms

used interchangeably even though they have

RF Generator Agilent E4400B

Digital multi-meter Fluke 87

Audio Analyzer HP 8903B

Spectrum Analyzer HP 8591A

Power Supply PS20

Shielded Test Lead Shure PT1838F

BNC (F) to ¼"

Jumper wires

0dBV = 2.2 dBu

different meanings.

adapter Shure PT1838C

25A1104 (Rev.1)

15

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.

.

Table 4

ATE Mode Test

Frequencies (MHz)

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

H7 K7 M7 M10 P11 Q11 R10 R11 R12 JB T10

1, 2, 3 b, c, d

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.

T est Point s 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

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)

25A1104 (Rev.1)

16

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 pre­dictive 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 sec­tion 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.

25A1104 (Rev.1)

17

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 devi­ation 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 thre shold.

The Alignment is now completed.

25A1104 (Rev.1)

18

NOTES

25A1104 (Rev.1)

19

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 circuit­ry. There should be no parasitic oscillations present during te sts 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

25A1104 (Rev.1)

20

FREQUENCY TABLES

A

G roup A Group B G roup C G roup D

N. & S . Amer i ca N. & S. America

ustralia / France ChinaN. & S . Ame rica

G roup E

G roup F

China / Korea

H7 536 - 548 K7 590 - 602 M7 662-674 M10 674-686 P 11 702-714 Q11 740-752

CH Freq CH Freq CH Freq CH Freq CH Freq CH Freq

1 536.075 1 590.075 1 662.075 1 674.025 1 702.075 1 740.125

2 547.925 2 601.925 2 673.925 2 677.900 2 703.275 2 741.325

3 537.275 3 591.275 3 663.275 3 682.775 3 706.025 3 744.075

4 546.725 4 600.725 4 672.725 4 684.700 4 707.925 4 745.975

5 540.025 5 594.025 5 666.025 5* 685.900 A 708.075 A 746.025

6 543.975 6 597.975 6 669.975 6 674.225 b 709.975 b 747.925

7 541.925 7 595.925 7 667.925 7 676.500 C 712.725 C 750.675

8 542.075 8 596.075 8 668.075 8 680.025 d 713.925 d 751.875

9 547.175 9 601.175 9 673.175 9 684.500
0 536.825 0 590.825 0 662.825 0** 685.700

G roup G

G roup JG roup H G roup L

China Tha i land / Taiwan

G roup K

UST10Australia / EU Japan

R10 800-812 R11 770-782 R12 794-806 JB 806-810 T 10 854 - 865 FCC ISM 902 - 928

CH Freq CH Freq CH Freq CH Freq CH Freq CH Freq

1 802.525 1 770.075 1 794.075 1 806.125 1 855.275 1 902.000
2 800.525 2 771.275 2 795.275 2 806.375 2 856.575 2 905.250
3 807.400 3 774.025 3 798.025 3 807.125 3 858.650 3 908.500
4 810.275 4 775.925 4 799.925 4 807.750 4 863.475 4 911.750

5* 811.550 A 776.075 A 800.075 5 809.000 5* 864.700 5 915.000

6 801.100 b 777.975 b 801.975 6 809.500 6 854.900 6 918.250
7 802.325 C 780.725 C 804.725 A 806.250 7 857.950 7 921.500
8 808.600 d 781.925 d 805.925 b 807.500 8 861.750 8 924.750
9 810.550 C 809.625 9 863.500 9 928.000

0** 813.800 d 808.625 0** 864.825 0

25A1104 (Rev.1)

* Compat ibl e wit h eac h of c hannels 1-4
** Compat ibl e wit h eac h of c hannels 6-9
Highlight ed Channels are c om pat i ble wit h each ot her

21

PRODUCT SPECIFICATIONS

System

PG1

Bodypack Transmitter

PG2

Handheld Transmitter

Working Range 75m (250 ft.)

Audio Frequency Response

+/– 2 dB

Total Harmonic Distortion

Ref. +/– 33 kHz deviation, 1 kHz
tone

Dynamic Range >100 dB A-weighted, typical
Operating Temperature

Range
Transmitter Audio Polarity Positive pressure on microphone diaphragm (or positive

Audio Input Level -10 dBV maximum at "mic" gain position

Gain Adjustment Range 30 dB
Input Impedance 1mΩ
RF Transmitter Output 10 mW maximum (dependent on applicable country

Dimensions 110mm H x 64 mm W x 21 mm D (4.3 in. x 2.5 in. x 0.8 in.)
Weight 75grams (2.6 oz.) without battery
Housing Molded ABS
Power Requirements One 9V size alkaline or rechargeable battery
Battery Life >8 hours (alkaline)

Audio Input Level +2 dBV maximum at -10dB position

Gain Adjustment Range 10dB
RF Transmitter Output 10 mW maximum (dependent on applicable country

Dimensions

including PG58 cartridge

Weight 218 grams (7.7 oz.) without battery
Housing Molded ABS handle and battery cup
Power Requirements One 9V size alkaline or rechargeable battery
Battery Life >8 hours (alkaline)

Note: actual range depends on RF signal absorption, reflec tion, and
interference

Minimum: 45 Hz
Maximum: 15 kHz

(Overall system frequency depends on microphone element.)

0.5%, typical

–18°C (0°F) to +57°C (+135°F)

Note: battery characteristics may limit this range

voltage applied to tip of WA302 phone pl ug) produces positive
voltage on pin 2 (with respect to pin 3 of low impedance output)
and the tip of the high impedance 1/4-inch output.

+10 dBV maximum at 0dB gain position
+20 dBV maximum at -10dB gain position

regulations)

-8 dBV maximum at 0dB position

regulations)
224 mm L x 53 mm Dia. (8.8 in. x 2.10 in.)

25A1104 (Rev.1)

PG4

Receiver

Dimensions 189mm L x 105mm W x 40 mm D (7.45 in. x 4.15 in. x 1.59 in.)
Weight 209.79 g (7.4 oz.)
Housing Molded ABS Plastic
Audio Output Level

Ref. +/– 33 kHz deviation with 1
kHz tone

Output Impedance XLR connector: 200 Ω

XLR output Impedance balanced

Sensitivity –105 dBm for 12 dB SINAD, typical
Image Rejection >50dB, typical
Power Requirements 12–18 Vdc at 160 mA, supplied by external power supply

XLR connector (into 100 Ω load): –19 dBV, typical
1/4 inch connector (into 100 Ω load): –5 dBV, typical

1/4 inch connector: 1kΩ

Pin 1: Ground (cable shield)
Pin 2: Audio
Pin 3: No Audio

22

TROUBLESHOOTING

Current draw and DC regulator tests

1. Connect the PS20 DC power supply to CON400.

2. Verify current draw is 120mA +/- 25mA.

3. If the current draw is above or below above specification disconnect the 9Vdc, 5Vdc and 3.3Vdc regulated power supply

feed points to each section of the receiver to deductively troubleshoot which section is causing the excessive current
drain.

DC regulated Power supply voltages

CHECK FOR 9.0VDC (±0.2 VDC) AT TP_9V (PIN 4 OF IC400):

1. If not, check for 12Vdc minimum at the output of CON400. If the output of CON400 is not 12Vdc minimum check the

external power supply for proper operation.

2. Check for 12Vdc minimum at the input of Pin 3 of IC400. If the input of Pin 3 of IC400 is not 12Vdc minimum verify the

electrolytic capacitor (C399 and/or C406) is not reversed.

3. Check D400 for proper placement and operation.

4. Check for solder bridges or shorted foil traces (defective PCB).

5. Disconnect the 9Vdc power supply feed points from each section of the recei ver to deductively tro ubleshoot which sec-

tion may be loading down the regulator output.

6. Lastly, replace IC400.

CHECK FOR 5.0VDC (±0.1 VDC) AT TP_5V (PIN 2&4 OF IC401):

1. If 5.0Vdc is not measured at TP_5V, verify that the electrolytic capacitor C405 is not reversed.

2. Disconnect the 5Vdc-power supply feed points from each section of the receiver to ded uctively troubleshoot which sec-

tion may be loading down the regulator output.

3. Lastly, replace IC401.

CHECK FOR 3.3VDC (±0.2 VDC) AT TP_3.3V (PIN 4 OF IC430):

1. If 3.3Vdc is not measured at TP_3.3V, verify that the electrolytic capacitors C430, 431,432 are not shorted out.

2. Disconnect the 3.3Vdc-power supply feed points from each section of the receiver to deductively troubleshoot which

section may be loading down the regulator output.

3. Lastly, replace IC430.

4.

Initial Setup:
ATE mode setup & use:

There are three different AT E 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

b, C, d for frequency groups P11, Q11, R11, R12, and JB. 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
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.

1, 2, 3 for frequency groups H7, K7, M7, M10, R10, and T10 and

Fmid for groups P11, Q11, R11, R12 , JB). The "A"

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.

25A1104 (Rev.1)

·Use RG58, RG174 or any other low loss, 50 ohms cable for all RF input connections. Keep the test cables as short as

possible between the RF generator and receiver. Note: any external "ON Channel" interference in the frequency of operation

23

under test can cause erratic and poor measurements. Verify using a spectrum analyzer that the frequency of operation under
test has no interference down to -90dBm.

·Remove both CH. A & B internal antennas from CON500 & CON505.

·Set the receiver into ATE mode and to “2” (Fmid). This sets the receiver to the center operating frequency and set the am­plitude to -50dBm. Conductively inject the output of the RF generator to the respective antenna input under test. For CH. A
inject into TP4 and for CH. B inject into TP5. No modulation is required unless specified.

.

Use a high impedance probe (FET Probe) & Spectrum Analyzer for all RF power measurements.

RF Troubleshooting

RF FRONT-END TO FIRST MIXER INPUT TROUBLESHOOTING:

1. The RF output at D510 should measure approximately -55dBm. If the RF amplitude is low check your signal path to the

input of D510. If the RF level is ok at the input of D510 verify that 3.3Vdc is present at pin 3. If so, replace D510.

2. The LNA input at pin 1 of IC520 should measure no less than approximately -55dBm. If so, check FL510 for proper tun-

ing & soldering and verify that C510, C511 and L511/C51 are the correct values.

3. Pin 11 of IC520 should measure approximately 15dB greater than the LNA input at pin 1. If the RF amplitude is low first

verify that pins 3 and 4 of IC520 measure about 3.5Vdc. If so, check C540, L540, L520, L545, C545, and L519 for poor
soldering and validate for correct part values. Lastly, if the RF amplitude is not approximately 15dB greater at pin 16 of
IC520 (LNA output) as compared to pin 1 (LNA input) replace IC520.

First mixer output (1st IF) & 1st LO troubleshooting:

Note for:

(Fo + 110.6MHz) ± 5.0 kHz for frequency groups H7,K7, M7, M10
(Fo - 110.6MHz) ± 5.0 kHz for frequency groups P11, Q11, R11, R12, R10, JB, T10

1. First check pin 6 of IC520 (1st IF output) it should measure 110.6MHz at approximately -35dBm. If the 1st IF output

amplitude is low verify that the 1st LO amplitude is no less than -5dBm at pin 8 of IC520.

2. If the 1st LO amplitude is low check the values and correct placement of all components leading back through the circuit

path to the collector of Q712. The 1st LO amplitude at the collector of Q712 should be no less than
0dBm(typ=+4.5dBm).

3. Verify that the 1st LO frequency is correct. If not, verify the correct channel setting. If channel setting is correct, measure

for 16 MHz +/- 160 Hz on pin 7 of IC1. If this frequency is deviated this can result in an offset in the 1st LO frequency. If
so, replace Y707.

4. If the 1st LO frequency is not present at pin 8 of IC520 verify that the tuning voltage of approximately 3.75Vdc is mea-

sured at TP1. If TP1 measures 0Vdc or near 5Vdc the VCO is not operating properly. Verify that pins 1 & 16 of IC1 mea­sure approximately 4.5Vdc. If not, troubleshoot back through pins 2&4 of IC401 and verify that the electrolytic capacitor
C405 is not reversed. If none of the above is a problem possibly either IC1 is defective or IC300 is not properly pro­grammed or defective.

25A1104 (Rev.1)

2nd mixer input & 2nd LO output troubleshooting:

Note for:
Board groups H7, K7, M7, M10 the 2nd LO is low side injected (1st IF -99.9MHz).
Board groups P11, Q11, R11, R12, R10, JB, T10 the 2nd LO is high side injected (121.3MHz - 1stIF).
(Three sections to look at: 1st IF, 2nd LO and 2nd IF)

1. Verify that the 5Vdc supply is at pin 5 of IC610. If not, verify for correct placement and component values associated

with the 5Vdc supply to IC610.

2. Verify pin 12 of IC610 (2nd IF input into detector) measures 10.7MHz at approximately -15dBm. If the 10.7MHz

amplitude is low or is not present check back through FL635 & FL620 to pin 14 of IC610 (2nd IF output from detector).
If the 10.7MHz signal at pin 14 of IC610 is very weak or not present proceed with 1stIF & 2ndLO troubleshooting sec­tions. If the 1st IF and 2nd LO signals test fine at IC610 but the 10.7MHz signal at pin 14 of IC610 is very weak or not
present replace IC610.

3. Verify pin 16 of IC610 (1stIF input into detector) measures 110.6MHz at approximately -10dBm. If not, verify the volt-

age on the collector of Q603 measures approximately 5Vdc. If not, troubleshoot back through the 5Vdc-supply circuit. If
the voltage was correct on the collector of Q603 verify the base measures approximately 3.2Vdc and the emitter mea­sures approximately 1.08Vdc. If not check for correct component placement and values around Q603. If the base and

24

emitter dc measurements are not correct replace Q603. If the voltages on Q603 were correct troubleshoot for correct
component placement and values back through the SAW filter FL600.

4. Verify pin 4 of IC610 (2nd LO input) measures the respective 2nd LO frequency at approximately -12dBm. If the 2nd LO

amplitude is low check the values and correct placement of all components leading back through the circuit path to the
collector of Q760. The approximate dc voltage measurements for Q760 are collector=4.6Vdc, base=1.5Vdc and emit­ter=1Vdc. If any of these dc measurements are not correct verify all components are correctly placed arou nd Q760.
Lastly replace Q760.

5. If the 2nd LO frequency is not present at pin 4 of IC610 verify that the tuning voltage of approximately 2.5Vdc is mea-

sured at TP750 in the 2nd LO VCO. If TP750 measures 0Vdc or near 5Vdc the 2nd LO VCO is not operating properly.
Verify that pins 1 & 16 of IC1 measure approximately 4.5Vdc. If not, troubleshoot back through Q430 and the 5Vdc-sup­ply circuit. Verify the correct placement and values of all components leading back through the 2nd LO circuit path. If
none of the above is a problem possibly either IC1 is defective or IC300 is not properly programmed or defective.

Audio output troubleshooting from detector (IC610)

Set up:
Apply 1KHz modulation at 33Khz deviation to the external modulation input of the RF generator. Use A-weighting and

30Khz low pass filters for all audio measurements unless specified otherwise. Set the RF generator output to -50dBm.

Low audio out of detector output (pin7 of IC610):

1. First verify that L610 is tuned for maximum audio output at pin7 of IC610. Tune the core of L610 from top to bottom of

the core shaft and back again for max audio output. This is to verify that a double audio peak is not detected. A maxi­mum audio level at pin 7 of IC610 should only occur at one core rotation position within the shaft of L610. If more than
one audio peak is detected replace L610. If not, measure the 10.7Mhz 2ndIF signal at pin 12 of IC610 using a FET
probe and spectrum analyzer centered at 10.7MHz with a span set to 100KHz (10KHz/division). Observed on the spec­trum analyzer, the 1Khz modulated 10.7Mhz signal should occupy approximately 6 1/2 divisions across the grid (each
division is equal to 10KHz) which represents +/-33KHz deviation. This measurement should also be the same when
measured at pin14 of IC610.

2. If the proper 10.7Mhz signal response as described above, is observed on the spectrum analyzer and the audio output

at pin7 of IC610 is very low or not present replace IC610. If the proper 10.7Mhz signal response is NOT observed refer
to the RF troubleshooting sections above.

Poor THD measurement out of detector output (pin7 of IC610):

1. First verify that L610 is tuned for maximum audio output at pin7 of IC610 by adjusting L610. Also, verify that the

10.7MHz 2nd IF signal is properly modulated as described in section above.

2. If the THD is still poor verify that the 1st LO has not deviated more than 12

1st LO of 600 MHz (600,000,000 cycles per second) with a tolerance of 12 PPM could vary in frequency by +/- 7.2KHz.
Since there are 600 "one million" units in 600MHz, the 600 units multiplied by the tolerance +/- 12 PPM equals 7.2KHz.
The exact frequency offset could be between 600,005,400Hz and 599,994,600Hz. This offset outside of the 12PPM tol­erance would cause an increased distortion reading throughout the audio chain. If this is observed replace Y707. If this
is NOT the case replace IC610.

Parts Per Million (PPM). As an example, a

Poor (SINAD) measurement out of detector output (pin7 of IC610):

Note: any external "ON Channel" interference in the frequency of operation under test can cause erratic and poor
SINAD measurements.

1. Verify using a spectrum analyzer that frequency of operation under test has no interference down to -100dBm. Verify

that the unit under test has been properly tuned up by performing the RF alignment procedures.

2. Set the RF generator to -105dBm. Measure the SINAD out of the detector at pin7 of IC610. The SINAD measurement

should measure approximately equal to or greater than 12dB at this level. If not refer to the RF troubleshooting sections
above to isolate where signal degradation is occurring.

TR100 trim does not change level

1.) Confirm audio signal at TP_R.

2.) Check for insufficient solder on the trimmer.

3.) Confirm 4.5Vdc at IC200 pin 14.

4.) Check that R100, R101, R102, C101 and C102 are placed and are the correct values.

25A1104 (Rev.1)

Fails Audio at TPE

1.) Check IC200 pin 14 for audio

2.) Check for 9VDC supply at IC200 pin 4

3.) Check placement and values of R100, R110, R111, R112, R115, C111, C112, and C113.

25

Fails/Weak Audio at TPBAL2/TPBAL3

1.) Confirm audio at TPE

2.) Confirm 4.5VDC at TP_Vref

3.) Confirm tone key in RF signal or R280 is shorted to disable TK

4.) Check and confirm values of C144, C150, R150, R153

5.) Check other components in vicinity

Fails Tone Key at TP_TK

1.) Confirm 4.5VDC at IC232 pins 1,5, and 7.

2.) Check RF signal for 32.768kHz tone key frequency

3.) Check RF signal for -20dBc tone key level

4.) Check placement of and values of C277, C278, R278, R279, R295, and R296

5.) TP_TK should measure > 0.5VDC with tone key present in RF signal

25A1104 (Rev.1)

26

NOTES

25A1104 (Rev.1)

27

REPLACEMENT PARTS

PRODUCT CHANGES

PARTS DESIGNATIONS

The following comments apply to the parts list and the schematics:

Resistors: Unless otherwise noted, all resistors are surface-mount with 1/10 W rating and 1% tolerance.

Capacitors: Unless otherwise noted, non-polarized capacitors are surface-mount NPO dielectric types with a 100 V ca-

pacity and a 5% tolerance, and polarized capacitors are tantalum types.

PG4 MODEL VARIATION

COUNTRY

CODE

H7 536-548 MHz N. & S. AMERICA 200H710998
K7 590-602 MHz N. & S. AMERICA 200K710998

M7 662-674 MHz N. & S. AMERICA 200M710998
M10 674-686 MHz FRANCE 200M1010998
P11 702-714 MHz CHINA 200P1110998
Q11 740-752 MHz CHINA / KOREA 200Q1110998
R10 800-812 MHz EU 200R1010998
R11 770-782 MHz CHINA 200R1110998
R12 794-806 MHz THAILAND 200R1210998

JB 806-810 MHz JAPAN 200JB10998
T10 854-865 MHz UK 200T1010998

FREQUENCY

RANGE

COUNTRY

DESIGNA TION

ANTENNA PART NUMBERS

Antenna

Part

Numbers

CH A 44Y8034 44Y8036

H7 K7 M7 M10 P11 Q11 R10 R11 R12 JB T10

PC BOARD
ASSEMBLY

25A1104 (Rev.1)

CH B 44Z8034 44Z8036

28

PG4 HARDWARE REPLACEMENT PART

R eference D escription Shure

Designator Part Number

A1 PG4 RECEIVER CASE ASSEMBLY 95B9138

M P 1 SHIELD,CO VER,SM A LL,STEEL ,TINNE D 53A 8602
M P 2 FEN C E,SHIELD,STE EL,P LAT E D ,TIN 53C8538
MP3 RoHS SCREW,THD-FRM, HD,PAN,PH,STL,YWL 30A1245B

PG4 PCB REPLACEMENT COMPONENTS

Reference Description Shure

CON145 JACK,PHONE,STEREO,RIGHT ANGLE,1/4" 95A8329
CON155 CONNECTOR,MALE,RIGHT ANGLE,3 PIN 95A8744
CON400 JACK,POWER,DC,.080 DIA. 95A8328
CON402 HEADER,SHROUDED,TOP ENTRY,2 POSITION 95A8272
CON500 CON505 CONNECTOR,ANTENNA,BRASS,PLATED 56B8104
C121 C144 C228 C405 CAPACITOR,TANTALUM,SMD1411,10uF,16V,10% 151AD106KB
C406 C715 C775 C776
C145 C399 CAPACITOR,ELECTROLYTIC,SMD,1uF,50V,10% 151BG105KB
C150 C152 C504 C509 CAPACITOR,ELECTROLYTIC,SMD,47uF,50V,20% 151BG476MF
C277 CAPACITOR,X5R,SMD 805,4.7uF,10V,10% 150XB475KA
C623 CAPACITOR,ELECTROLYTIC,SMD,100uF,35V,20% 151BF107MF
C714 CAPACITOR,TANTALUM,SMD1206,.47uF,16V,10% 151AD474KA
C717 C752 CAPACITOR,TANTALUM,SMD1206,.1uF,35V,10% 151AG104KA
C751 CAPACITOR,TANTALUM,SMD1411,4.7uF,16V,10% 151AD475KB
CV720 CAPACITOR,TRIM,SMD,.65-2.5pF 152A04
D122 D134 D162 D228 D278 DIODE,SIGNAL,SWITCHING,SOT-23,100VDC 184A08
D400 DIODE,SCHOTTKY,100V/1A,SMB 184A75
D510 DIODE,ATTENUATOR,PIN,COMMON ANODE,SOT23 184A40
D720 DIODE,CAPACITANCE,VARIABLE,SC79-2 184A72
D755 DIODE,TUNING,RF,SOD-323,30VDC 184A36
DS300 LED, GREEN, DISPLAY, SING DIGIT NUA 86A8448
DS320 LED,GREEN,T-1,RT ANG,REVERSE 86B8449
DS322 LED,RED/GREEN,BI-COLOR,RT ANGLE 86C8452
E398 E399 E400 E401 E700 FERRITE,BEAD,SMD 805,600 OHM 162A77
E515 E517 E600 BEAD,FERRITE,SMD 603,600 OHM 162A46
FL510 FILTER,HELICAL,HR-5W,PINS 4&9 GND,542MHz 86J9029
FL600 FILTER,SAW,110.592MHz 162A68
FL620 FL625 FILTER,CERAMIC,10.7MHz 86A9021
L610 COIL,QUADRATURE,10.7MHz 82A8004
L720 INDUCTOR,SPRING,MICRO,AIR CORE,5.4nH 162D61
Q113 Q160 Q161 TRANSISTOR,TMOS,SOT-23,FET,2N7002 183A30
Q162 TRANSISTOR,LOW NOISE,SOT-23,NPN,5089 183A38
Q712 Q724 Q760 TRANSISTOR,HIGH FREQ,3 PIN MINI MOLD,NPN 183A66
Q603 TRANSISTOR,HIGH FREQ,NPN,SOT-343 183A80
TR100 TR220 P0TENTIOMETER,TRIM METAL-GLAZE,LINE,100K 146E10
IC1 SYNTHESIZER,DUAL,POWER,LOW,LMX2335LTM 188B388
IC100 COM PANDER,16 PIN QSOP 188A671
IC200 IC260 AMPLIFIER,OPERATIONAL,QUAD,SO-14,MC33179 188A49
IC232 AMPLIFIER,OPERATIONAL,DUAL,SO-8,SC79161 188A18
IC300 MICROCONTROLLER,16K FLASH,1K RAM,48QFN 188A669
IC400 REGULATOR,VOLT,POSITIVE,DPAK,MC33269DT 188A272
IC401 REGULATOR,LOW DROPOUT,5V,SOT23 188D526
IC430 REGULATOR,CMOS LDO,3.3V,SC-70-5 188A590
IC520 LNA/MIXER,LOW CURRENT,SO-14,RF2418 188A127
IC610 DETECTOR,FM IF,WIDE BAND,SSOP16 188A573
SW310 SWITCH,MOMENTARY,RT ANG,GRAY BUTTON,SPST 55D8105
Y285 CRYSTAL,32.768KHz 40A8010
Y707 CRYSTAL,QUARTZ,16MHz,5X3.2mm 140A35

Designator Part Number

25A1104 (Rev.1)

29

PG4 FREQUENCY DEPENDENT PARTS**

re q ue nc y H 7 K 7 M 7 M 10 P 11 Q 11 R 10 R 11 R 12 J B T 10

Code

C1 2. 7 p f DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP
C10 DNP DNP DNP DNP DNP DNP DNP DNP DNP 2.7 p f DNP
C11 DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP 2. 7 p f
C2 DNP 2. 7 p f DNP DNP DNP DNP DNP DNP DNP DNP DNP
C3 DNP DNP 2.7 p f DNP DNP DNP DNP DNP DNP DNP DNP
C346 DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP
C347 DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP
C4 DNP DNP DNP 2. 7 p f DNP DNP DNP DNP DNP DNP DNP
C5 DNP DNP DNP DNP 2. 7 pf DNP DNP DNP DNP DNP DNP
C51 DNP DNP 100 pf 100 p f DNP DNP DNP DNP DNP DNP DNP
C511 1 00 pf 1 00 pf 3.9 pf 2.7 pf 100.0 pf 100.0 pf 1 00. 0 pf 100.0 pf 100.0 pf 1 00. 0 pf 100.0 pf
C522 2.7 pf 2.7 pf 2.2 pf 2.2 pf 2.7 pf 2.7 pf 2.7 pf 2.7 pf 2.7 pf 2.7 pf 2.2 pf
C540 6.8 pf 6.8 pf 6.8 pf 6.8 pf DNP DNP DNP DNP DNP DNP DNP
C545 6.8 pf 6.8 pf 6.8 pf 6.8 pf DNP DNP DNP DNP DNP DNP DNP
C6 DNP DNP DNP DNP DNP 2. 7 pf DNP DNP DNP DNP DNP
C7 DNP DNP DNP DNP DNP DNP 2.7 p f DNP DNP DNP DNP
C72 0 DNP DNP DNP DNP 1.0 p f 1.8 p f DNP DNP DNP DNP 0.5 p f
C721 5.6 pf 4.7 pf 5.6 pf 4.7 pf 8.2 pf 4.7 pf 4.7 pf 5.6 pf 5.6 pf 4.7 pf 5.6 pf
C723 3.9 pf 2.7 pf 2.7 pf 2.7 pf 5.6 pf 3.9 pf 2.7 pf 3.9 pf 2.7 pf 2.7 pf 3.3 pf
C724 2.2 pf 2.7 pf 2.7 pf 2.7 pf 2.7 pf 2.7 pf 2.7 pf 2.7 pf 2.7 pf 2.7 pf 1.8 pf
C725 2.2 pf 2.7 pf 2.7 pf 2.7 pf 2.7 pf 2.7 pf 2.7 pf 2.7 pf 2.7 pf 2.7 pf 2.2 pf
C729 5.6 pf 5.6 pf 4.7 pf 4.7 pf 10.0 pf 5.6 pf 4.7 pf 5.6 pf 4.7 pf 4.7 pf 4.7 pf
C730 4.7 pf 4.7 pf 5.6 pf 5.6 pf 10.0 pf 5.6 pf 5.6 pf 4.7 pf 5.6 pf 5.6 pf 5.6 pf
C734 5.6 pf 5.6 pf 4.7 pf 4.7 pf 5.6 pf 4.7 pf 5.6 pf 4.7 pf 5.6 pf 5.6 pf 4.7 pf
C756 20.0 pf 20.0 pf 20.0 pf 20.0 pf 1 2. 0 pf 12.0 pf 12.0 pf 1 2. 0 pf 12.0 pf 12.0 pf 1 2. 0 pf
C762 47.0 pf 47.0 pf 47.0 pf 47.0 pf 33.0 pf 33.0 pf 33.0 pf 33.0 pf 33.0 pf 33.0 pf 33.0 pf
C763 1 20. 0 pf 120.0 pf 1 20. 0 pf 120.0 pf 82.0 pf 82.0 pf 82.0 pf 82.0 pf 82.0 pf 82.0 pf 82.0 pf
C765 27.0 pf 27.0 pf 27.0 pf 27.0 pf 47.0 pf 47.0 pf 47.0 pf 47.0 pf 47.0 pf 47.0 pf 47.0 pf
C8 DNP DNP DNP DNP DNP DNP DNP 2. 7 p f DNP DNP DNP
C9 DNP DNP DNP DNP DNP DNP DNP DNP 2. 7 pf DNP DNP
FL510 86J9029 86K9029 86L9029 86L9 029 86D9029 80H9029 80E9029 80M 9029 80G9029 80G9029 80F9029
L511 1 . 2 nH 1.2 nH DNP DNP 1 8 nH 1 8 nH 18 nH 18 nH 1 8 nH 1 8 nH 18 nH
L711 1 2 nH 1 2 nH 10 nH 10 nH 12 nH 1 2 nH 10 nH 12 nH 10 nH 1 0 nH 10 nH
L720 5.4 nH 5.4 nH 3.85 nH 3.85 nH 5. 4 nH 5.4 nH 5.4 nH 5.4 nH 5.4 nH 5.4 nH 3.85 nH
L756 68 nH 68 nH 68 nH 68 nH 56 nH 56 nH 56 nH 56 nH 56 nH 56 nH 56 nH
R101 75 k 75 k 75 k 75 k 75 k 49.9 k 75 k 75 k 75 k 75 k 75 k
R219 15 k15 k15 k15 k15 k8.25 k15 k15 k15 k15 k15 k
R313 0 k DNP 0 k DNP 0 k DNP 0 k DNP 0 k DNP 0 k
R314 DNP DNP 0 k 0 k DNP DNP 0 k 0 k DNP DNP 0 k
R315 DNP DNP DNP DNP 0 k 0 k 0 k 0 k DNP DNP DNP
R316 DNP DNP DNP DNP DNP DNP DNP DNP 0 k 0 k 0 k
R719 22.1 33.2 33.2 33.2 49.9 22.1 33.2 33.2 33.2 33.2 33.2

25A1104 (Rev.1)

30

UNPLACED COMPONENT LIST**

C103 C114 C165 C346 C347 C520 C521 C600 C602
C611 C612 C622 CV703 FL610 IC360 L540 L545 Q168
R168 R280 R346 R347 R360 R400 R612 R613 R776

R790 SHLD2 Y347

NOTE: APPLIES TO ALL FREQUENCY CODES

25A1104 (Rev.1)

31

PCB LAYOUT

DGND

+3.3V

TP2

TPN

TP3

TP600

TPR

VREF

TP RSSI - A2D

25A1104 (Rev.1)

32

5VPLU

TP750

TPI

TP5V

TP9V

25A1104 (Rev.1)

33