RELM RPU416, User Manual, Page: 38 / 39

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SSG output level for obtaining 12dB/SINAD when injected to each point Modulate the AF level with a frequency of 1KHz and deviation of 1.5KHz
through a 470pF coupling capacitor. (Narrow), 3KHz (Wide). Then take the signal from the signal generator
Measure the 1
st
Local level on a RF VTVM. when the AF output has been adjusted to 0.63Vrms with the AF vol.
Measure the audio frequency on an AF VTVM and radio frequency on a RF VTVM at high impedance. Set the MIC input to obtain a modulation factor of 60%
with the transmit frequency at center and a modulation frequency of 1KHz.
RPU416 Level Diagram
Rx Section
MIC
VR501
C40
D5
Q4
Q100
C100
Q6
Q101
C106
Q102
C114
Q105 ANT
IC500
16mVrmS 430mVrms 310mVrms
0.15Vrms 0.44Vrms 0.8Vrms
4W
AF VTVM
RF VTVM
C119
Q107
0.62Vrms
-103dBm
-104dBm
-106.5dBm -103dBm 1018mVrms 175mVrms 23.5mVrms 0.63Vrms
SP IC302 IC300 IC200
Q201
XF201
L203,L214
L208
-116.5dBm
ANT
L112
-113dBm
5R
-98dBm
1st Local
0.1Vrms
RF IF 38.85MHz
center
AF 1kHz
Q203
Q202
Q307
R224
C145
C212
R217
R211
R210
VR
Tx Section
Measure the audio frequency on an AF VTVM and radio frequency on a RF VTVM at high impedance. Set the MIC input to obtain a modulation factor of 60% with the transmit
frequency at center and a modulation frequency of 1KHz.
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