ALIGNMENT PROCEDURE AND PERFORMANCE TESTS
8-6
Revised January 1995
Part No. 001-9750-003
PERFORMANCE TESTS
8.5 RECEIVER PERFORMANCE TESTS
CAUTION
Do not transmit with the signal generator connected
because severe generator damage could result.
Applying a positive DC voltage to either audio ampli-
fier output (even momentaril
y)
will seriously damage
the device. Grounding an output should not result in
damage.
a. Connect the test cables shown in Figure 8-1 to the
microphone and accessory jacks. Connect the test
setup shown in Figure 8-3.
b. Select the test mode RX-TX-RSSI function as
described in Section 8.1.1. Press and turn the Select
switch to select Ch 381 (860.5125) or Ch 240*
(938.0000).
c. Connect the RF signal generator to the antenna jack.
Set it to the channel frequency with an output of –47
dBm (1000 mV) modulated with 1 kHz at 3 kHz
deviation (800 MHz) or 1.5 kHz deviation (900
MHz).
d. Adjust the volume control for an audio output level
of 6.9V rms across a 4-ohm load (12W). Distortion
should be less than 3%.
e. Decrease the generator output to obtain 12 dB
SINAD. The generator output should be –111 dBm
(0.63 mV) maximum (with a 6 dB pad).
f. Also check the channels at the low and high ends of
the band.
8.6 TRANSMITTER PERFORMANCE TESTS
NOTE: For accurate power measurement at 800 and
900 MHz, use a minimum number of connectors with a
teflon or better dielectric. If coaxial cable is used, it
should be a minimum length of a low-loss type.
a. Connect the test cables shown in Figure 8-1 to the
microphone and accessory jacks. Connect the test
setup shown in Figure 8-2.
b. Select the test mode RX-TX-RSSI function as
described in Section 8.1.1. Press and turn the Select
switch to select Ch 381 (860.5125) or Ch 240*
(938.0000).
c. Key the transmitter and note the power output on the
six test channels. Power output on the three standard
channels should be as indicated in Section 8.3.2,
step b and power output on the talk-around channels
should be as indicated in step e of that section.
(Talk-around channels have “TA” after the channel
number or frequency.)
d. If some systems are to be programmed for less than
standard power output, check power levels 2-4 and
2W as described in Section 8.3.3.
e. Select Ch 381 (860.5125) or Ch 240* (938.0000)
and monitor the transmit signal with a communica-
tions monitor set to 815.5125 or 899.0000* MHz.
The transmit frequency should be within ± 1.5 PPM
(800 and 900 MHz). (At room temperature, it should
be within ± 150 Hz.) This also checks the receive
frequency.
f. With no microphone audio input signal, monitor the
transmit data signal. Deviation should be 1 kHz ± 50
Hz (800 MHz) or 800 Hz ± 50 Hz (900 MHz).
g. Inject a 2V rms 1 kHz signal at pin 11 of microphone
jack P2. Total deviation (audio + data) should be as
indicated in Section 8.3.6, step b. Also check the
other test channels.
* Setting with 900 MHz models
Содержание Summit DM 975x
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Страница 108: ...CIRCUIT DESCRIPTION 6 3 August 1993 Part No 001 9750 001 Figure 6 1 Transceiver Block Diagram ...
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Страница 131: ...SERVICING 7 8 Revised January 1995 Part No 001 9750 003 ...
Страница 156: ...9 19 Revised December 2000 Part No 001 9750 007 TRANSCEIVER EXPLODED VIEW PART 1 ...
Страница 157: ...Revised January 1995 Part No 001 9750 003 9 20 TRANSCEIVER EXPLODED VIEW PART 2 Remote Control Parts ...
Страница 168: ...Revised January 1995 Part No 001 9750 003 10 11 INTERCONNECT SCHEMATIC ...
Страница 169: ...Revised January 1995 Part No 001 9750 003 10 12 DISPLAY BOARD SCHEMATIC ...
Страница 170: ...Revised January 1995 Part No 001 9750 003 10 13 DISPLAY BOARD TOP VIEW DISPLAY BOARD BOTTOM VIEW ...
Страница 171: ...Revised January 1995 Part No 001 9750 003 10 14 RF BOARD SCHEMATIC REVISED 800 MHZ ...
Страница 172: ...Revised January 1995 Part No 001 9750 003 10 15 RF BOARD BOARD LAYOUT ALL 800 900 MHZ ...
Страница 173: ...Revised January 1995 Part No 001 9750 003 10 16 RF BOARD BOARD SCHEMATIC 900 MHZ ...
Страница 174: ...Revised January 1995 Part No 001 9750 003 10 17 RF BOARD BOARD SCHEMATIC UNREVISED 800 MHZ ...
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Страница 179: ...Revised January 1995 Part No 001 9750 003 10 22 PA BOARD SCHEMATIC 900 MHZ 15W ...
Страница 180: ...Revised January 1995 Part No 001 9750 003 10 23 PA BOARD BOARD LAYOUT 900 MHZ UNREVISED 800 MHZ 15W 30W 35W 15W MODELS ...
Страница 181: ...Revised January 1995 Part No 001 9750 003 10 24 PA BOARD SCHEMATIC UNREVISED 800 MHZ 35W ...
Страница 182: ...Revised January 1995 Part No 001 9750 003 10 25 PA BOARD SCHEMATIC UNREVISED 800 MHZ 15W ...
Страница 183: ...Revised January 1995 Part No 001 9750 003 10 26 AUDIO LOGIC BOARD SCHEMATIC PART 1 OF 2 ...
Страница 184: ...Revised January 1995 Part No 001 9750 003 10 27 AUDIO LOGIC BOARD SCHEMATIC PART 2 OF 2 ...
Страница 185: ...Revised January 1995 Part No 001 9750 003 10 28 AUDIO LOGIC BOARD LAYOUT TOP VIEW ...
Страница 186: ...Revised January 1995 Part No 001 9750 003 10 29 AUDIO LOGIC BOARD LAYOUT BOTTOM VIEW ...
Страница 188: ...Revised January 1995 Part No 001 9750 003 10 31 REMOTE TRANSCEIVER INTERCONNECT SCHEMATIC ...
Страница 189: ...Revised January 1995 Part No 001 9750 003 10 32 REMOTE CONTROL UNIT INTERFACE BOARD SCHEMATIC ...
Страница 216: ...Part Number 001 9750 007 12 00 hph Printed in U S A ...
