Standard radio & telefon, SRT CR91
The SRT CR91 is a Swedish made receiver manufactured between 1982 and 1992, and still (2015) in use in several places.
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Description
Specifications
- Frequency range
- 10 kHz - 30 MHz
- Frequency setting
- By push-buttons or continuously by a single knob in 1 Hz, 10 Hz, or 100 Hz steps over the entire frequency range
- Main tuning knob characteristics
- SLOW: 2.5 kHz/turn,
- MED: 25 kHz/turn,
- FAST: 250 kHz/turn
- Frequency accuracy
- 1x10^-7 over temperature range
- Aging
- Less than 3x10^-9 per day after three month of operation Modes of operation: CW, FSK, AM, USB, LSB, and ISB (with optional card)
- Input impedance
- 50 ohm, SWR < 3 or high impedance, selectable Input protection: 30 V EMF behind 50 ohm continuously for up to 15 minutes
- (no term)
- Sensitivity::
- A3J (bandwidth = 3 kHz) = 0.6 uV EMF for 12 dB SINAD,
- A3 (bandwidth 6.8 kHz, m = 30%) = 3 uV EMF for 12 dB SINAD
- IF selectivity (standard version)
Mode - 3 dB -60 dB Ratio Very narrow +/- 150 Hz +/- 500 Hz 1:3.33 Narrow +/- 300 Hz +/- 850 Hz 1:2.83 Medium +/- 750 Hz +/- 1250 Hz 1:1.67 Wide +/- 3400 Hz +/- 4500 Hz 1:1.32 USB +250 and +3000 Hz -250 and +3500 Hz 1:1.36 LSB -250 and -3000 Hz +250 and -3500 Hz 1:1.36 - Cross modulation
- Wanted signal 300 uV EMF, unwanted signal more than 1 V EMF, m = 30 % to produce an output of 20 dB below the wanted signal output
- Reciprocal mixing
- With a wanted signal of 100 uV EMF in 3 kHz bandwidth, an unwanted signal 20 kHz removed must be more than 75 dB and typically 80 dB above the wanted signal to produce a noise level of 20 dB below the wanted signal output
- Intermodulation (out of band)
- Two 30 mV EMF signals separated and removed 20 kHz from the tuned frequency will produce less than -85 dB and typically -90 dB third order intermodulation
- Intermodulation (in band)
- Two 30 mV EMF signals within the IF bandwidth (SSB mode) giving AF output of 1100 Hz and 1700 Hz will produce less than -45 dB third order intermodulation at the line output (line level = 0 dBm)
- IF attenuation
- More than 100 dB
- Image rejection
- More than 100 dB
- Spurious responses (1.6 - 30 MHz)
- With a wanted signal giving 12 dB SINAD, unwanted signals more than 20 kHz removed from the tuned frequency must be more than 100 dB above the wanted signal to produce an equivalent output
- Internally generated spurious signals
- 1.6 - 30 MHz
- Not exceeding an equivalent aerial input of 0.2 uV EMF and maximum 8 responses not exceeding an equivalent aerial input of 0.9 uV EMF
- 10 kHz - 1.6 MHz
- Not exceeding an equivalent aerial input of 0.5 uV EMF and maximum 2 responses not exceeding an equivalent aerial input of 0.9 uV EMF
- AGC range
- An increase of 120 dB from 2 uV EMF will produce an output level change of less than 3 dB
- AGC time constants
- Attack
- less than 2 ms
- Decay
- 0.1, 1, and 5 seconds, selectable
- BFO
- Synthesized from the master oscillator.
- CW
- tunable in 100 Hz steps, 300 Hz to 1800 Hz rel. fo
- FSK
- tunable in 100 Hz steps, 300 Hz to 2800 Hz rel. fo
- SSB/ISB
- fixed at fo
- Line outputs (600 ohm balanced)
- Adjustable up to +10 dBm, distortion less than 0.5%
- Loudspeaker output (4 - 8 ohm)
- 2 W maximum at less than 5% distortion
- Channel memory
- 100 channels. All parameters are stored. Battery life 5 years min. The channels can be write protected
- Remote control
- All front panel functions can be remotely controlled from the CR91R. With computer control additional functions are available.
- Interface
- serial RS232, 50 to 2400 baud ASCII
- Power supply
- 220 VAC +/- 10%, 45 - 400 Hz
- Power consumption
- 60 VA maximum
- Temperature range
- Operational
- -30 to +55 degC
- Storing
- -40 to +70 degC
- Relative humidity
- Max 95% according to IEC 68-2-30
- Vibration
- 5 - 60 Hz 2g according to IEC 68-2-6
- Bumps
- 4000 bumps 25g in main direction (with recommended shock absorbers) according to IEC 68-2-29
- Dimensions
- Panel width
- 482 mm (19")
- Height
- 133 mm
- Depth
- 320 mm
- Weight
- 12 kg