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Preliminary Tests
Listening Tests
Functional Tests
Test
RF
Audio Tests
25C1020
(EA)
Before disassembling the unit, operate it to determine whether it is function-
ing normally. First and most important: Review the customer's complaint (if avail-
able) and focus your tests on the problem. If this proves inconclusive or you want
somewhat more extensive checks, perform the following functional tests.
The following tests require partial disassembly of the unit:
The following is the best "fast" test of a receiver's
er that passes this test can be removed from the list of suspects for any "drop-
out" or "range" problem.
Initial Set-up
1. Set the receiver's Squelch control to its middle position and the Volume
control to its maximum position.
2. Set the
signal generator to the receiver's frequency.
RF
3. Remove the receiver's antenna (see "Disassembly," page 7). Plug the
end of the 50 Ω test cable into the
BNC
the cable's center conductor to the receiver's antenna input (
1), and the shield to a ground plane as close as possible to the an-
TPB
tenna input (
TPA
Test
1. Connect power to the receiver and turn it on.
2. Verify that the unit unsquelches with
3. When the unit unsquelches, verify that the "Diversity"
Initial Set-up
1. Set the
generator as follows:
RF
Level: –60 dBm
Deviation: 15 kHz
Modulation: Ext
2. Set the audio analyzer as follows:
Amplitude: 1.4 V
Frequency: 1 kHz
3. Using a 3.3 kΩ load, connect the receiver's unbalanced audio output to
the input of the audio analyzer, and engage the 400 Hz and 30 kHz fil-
Shure T4 Diversity Receiver
2 or
2).
TPB
RF
rms
5
performance. A receiv-
RF
signal generator. Tack-solder
RF
TPA
signals greater than –89 dBm.
glows.
LED
Preliminary Tests
1 or
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