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Last modified 2020-03-23

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Magnum 257

A picture of Magnum 257

SPECIFICATIONS

GENERAL
Type:Citizen band / "Freeband" / Export transceiver
Frequency range
depending on setting:
26.965-27.405 MHz (CB)
25.165-29.699 MHz (Export)
28.000-29.699 MHz (10 m)
Channels/tuning steps:40 or 454 channels, or 1 / 10 / 100 KHz steps
Mode:AM/FM/SSB
Frequency control:PLL
Frequency stability:10 ppm @ 0-40C (32-104F), after 15 minutes warmup
Power supply:12-14 VDC
Current drain/power consumption:RX: ? mA
TX: Max 6 A
Antenna impedance/connector:50 ohm / SO-239
Dimensions (W*H*D):152*51*241 mm (6*2*9.5")
Weight:1.32 Kg (2.9 lbs)
Other features:5 memories. ANL & NB.




RECEIVER SECTION
Receiver system:Double conversion superheterodyne
1st IF: 10.695 MHz
2nd IF: 455 KHz
Sensitivity: AM: 1 uV (10 dB S+N/N)
FM: 0.3 uV (12 dB SINAD)
SSB: 0.25 uV (10 dB S+N/N)
Selectivity: AM/FM: 6 KHz (-6 dB), 18 KHz (-60 dB)
SSB: 4.2 KHz (-6 dB), 8.5 KHz (-60 dB)
Image rejection:
AF output power/speaker:2 W at 10% distortion / 8 ohm
External speaker connector:3.5 mm, 8 ohm




TRANSMITTER SECTION
RF output power: AM: 9 W (Average), Max 30 W (PEP)
FM/SSB: Max 30 W
Modulation system:
FM deviation:2 KHz
Spurious emissions:Less than -50 dB
Microphone impedance/connector:600-1000 ohm / 6-pin (Metal screw ring connector)




MISCELLANEOUS
Manufactured:1999-2010 (Discontinued)
Additional info:
Related documents:User manual (324 KB)
Modifications:Frequency expansion (116 KB)
Reviews:
Options/Accessories:
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