Service Manual

SRM9000 SERIES SERVICE MANUAL
© TMC Radio 2006 page 13 TNM-U-E-0002 Issue 1
1.8.3 Receiver
ETS AS4295
Sensitivity
≤0.5µV PD (-113dBm) for 20dB
SINAD
≤0.3µV PD (-117.5dBm) for 12dB
SINAD
≤0.5µV PD (-113dBm) for 20 dB
Quieting.
Adjacent Channel
Selectivity
25kHz Channel Spacing: >73dB
12.5kHz Channel Spacing: >60dB
25kHz Channel Spacing: >73dB
12.5kHz Channel Spacing: >65dB
Intermodulation Rejection
>65dB >70dB
Spurious Response
Rejection
>70dB >73dB
Blocking
>95dB >95dB
Conducted Spurious
Emissions
<2nW (-57dBm) - 9kHz to 1GHz
<20nW (-47dBm) - 1GHz to 4GHz
<20nW (-47dBm) - 9kHz to 4GHz
GENERAL
FM Residual Noise
(CCITT weighted)
25kHz Channel Spacing: >45dB
12.5kHz Channel Spacing: >40dB
Mute Range
Typically 6dB to 25dB SINAD
Typical setting 10dB to 12dB SINAD
Mute Response Time
<30mS (no CTCSS)
Add 200mS for CTCSS
Voting Response Time
Searches at 50ms/channel
Audio Distortion
4W into 4Ω at <5% distortion
Audio Frequency
Response
300 to 3000Hz*: +1dB to -3dB
Figures apply for a flat audio response or a 6dB/octave de-emphasis curve
(*2550Hz for 12.5kHz channel spacing)
Deviation Sensitivity
(for rated audio at 1kHz)
Speaker: 20% MSD±3dB
Option Audio Output at
60% MSD (P1-23)
Standard build: Flat Unsquelched Audio: 200mV±1dB RMS-O/C (R871=NF,
R872=0R, R82=NF on Rev 9C or 0R/1k on Rev 9B), Flat Squelched Audio:
450mV±2dB RMS-O/C at Rated Speaker Audio (R871=1k or 0R, R872=NF,
R82=NF).
Option Audio Output at
60% MSD (P2-15)
Standard build: Flat Unsquelched Audio: 160mV±1dB RMS (600 ohms) R871=1k,
R82=1k, C857=NF: Flat Squelched Audio: 88mV±2dB RMS (600 ohms) at Rated
Speaker Audio.
Handset Audio (S1-6)
230mV±2dB RMS (600 ohms) at Rated Speaker Audio.