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Last modified 2022-01-18

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Magnum 257HP

A picture of Magnum 257HP

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 @ 0-40°C (32-104°F), after 15 minutes warmup
Clarifier or Delta tune:±1.5 KHz (RX/TX)
Power supply:12-14 VDC
Current drain / power consumption:RX: ? mA
TX: Max ? 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 lb)
Other features:5 memories. ANL & NB. Talkback.




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: Max 80 W (PEP)
FM: Max 15 W
SSB: Max 80 W (PEP)
Modulation system:
FM deviation (Factory set):±2 KHz
Spurious emissions:Better than -50 dB
Microphone impedance / connector:600-1000 ohm / 6-pin (Metal locking ring connector)
Microphone input level:? mV




MISCELLANEOUS
Manufactured:2011-2014 (Discontinued)
Main PCB:
Sub PCBs:
Additional info:
Related documents:User manual (324 KB)
Sams Photofact #:None
Modifications and fixes:Frequency expansion (29 KB)
Reviews:
Options / Accessories:
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