Magnum 257
AT6
A very compact 10m multimode radio, making it ideal for use mobile.
Despite it's size it packs loads of features and plenty of output.
Standard frequency range is 28 - 29.7MHz, but it can be expanded to cover 25.165 - 29.7MHz (not legal in the UK).
Click on the picture for full details (note picture shows the Albrecht version of this radio).
Latest model now with BLUE display. ! Microprocessor Controlled Transceiver
· 28.000 to 29.699 MHz Frequency Range
· 30 Watts RF Output Power
· Variable Power - In All Modes
· FM / USB / LSB / AM
· 1 kHz / 10 kHz / 100 kHz Steps
· 5 Digit Frequency Display
· ECM Microphone with Up and Down Frequency Controls
· 5 Memory Channels - Saves Both Frequency and Mode
· Back Lit LCD Display and Front Panel Controls
· Digital S/RF Meter on LCD
· RF Gain and Microphone Gain Controls
· +/- 1 kHz Clarifier
· Noise Blanker and Automatic Noise Limiter
· Frequency Scan
· Last Channel Recall - Returns to Last Operated Frequency and Mode
· Split Frequency Offset for Repeater Use
· Receive Audio Tone Control
· MARS / CAP Compatible
GENERAL SPECIFICATIONS
Frequency Coverage: 28.000 to 29.699 MHz
Antenna Impedance: 50 ohm, unbalanced
Frequency Control: Digital Phase-Lock Loop (PLL) Synthesizer
Frequency Accuracy: Better than +10 ppm from 0 - 40 °C after 15 min. warm up
Power Requirement: 12 -13.8 V DC, negative ground
Current Consumption: 6 amps maximum
Dimensions: 6 x 2 x 9.5 in (W x H x D)
Weight: 2.9 Ibs TRANSMITTER SPECIFICATIONS
Power Output: SSB/ FM...30 Watts, AM...9 Watts Average / 30 Watts PEP
Tuning Steps: 1 kHz /10 kHz /100 kHz
Final Transistors: 2SC1969 (x2)
Spurious Emissions: More than 50 dB below peak output power
Carrier Suppression: More than 40 dB below peak output power
Unwanted Sideband: More than 50 dB below peak output (1 kHz tone)
FM Deviation: +/- 2 kHz maximum
Audio Response: More than 30dB below peak output
Frequency Response: 400 to 2800 Hz
Microphone Impedance: ECM, 600 to 1 K ohms RECEIVER SPECIFICATIONS
Circuit Type: Dual-Conversion Superheterodyne
Intermediate Frequencies:
1st IF/SSB IF...10.695 MHz
2nd IF...455 kHz
Sensitivity:
SSB...0.25 V at 10 dB S + N/N
AM...1.0 Vat10dBS+N/N
FM...0.3 Vat12dBSINAD
Selectivity:
SSB...4.2 kHz (-6 dB) / 8.5 kHz (-60 dB)
AM / FM...6.0 kHz (-6 dB) /18 kHz (-60 dB)
Clarifier Range: +/-1.5 kHz
Adjacent Channel Rejection: Better than 70 dB
I F Rejection: Better than 80 dB for all frequencies
Frequency Response: 250 to 3000 Hz
Audio Output Power: 2 watts minimum at 10% THD with an 8 ohm load
Audio Output Impedance: 8 ohms !
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