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Last modified 2021-04-25

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Maycom EM-27

A picture of Maycom EM-27


Type:Citizen band / "Freeband" / Export transceiver
Frequency range
depending on config:
26.965-27.405 / 27.60125-27-99125 MHz (Standard)
26.065-28.305 MHz (Export mode)
25.165-29.655 MHz (Export mode)
23.815-30.555 MHz (Export mode)
Channels/tuning steps: 40 CEPT + 40 UK (Standard)
200, 400 or 600 channels, or 5 / 10 KHz steps (Export mode)
NB! The VCO will most likely not lock over the full 600 ch range.
You will have to align it to your prefered segment.
Frequency control:PLL/CPU (LC72338)
Frequency stability:? ppm
Power supply:13.2 VDC (3-pin connector)
Current drain/power consumption:RX: ? mA @ 13.2 VDC
TX: Max ? A @ 13.2 VDC (Standard)
TX: Max ? A @ 13.2 VDC (Export mode)
Antenna impedance/connector:50 ohm / SO-239
Dimensions (W*H*D):150*45*170 mm (5.91*1.77*6.69")
Weight:780 g (1.72 lb), without mounting bracket
Other features: 7 memories. Scanning. Dual watch. LCR. Dimmer. Voltmeter.
Repeater split (Export mode).

Receiver system:? conversion superheterodyne
1st IF: ? MHz
2nd IF: 455 KHz - Ceramic filter: 33-455HT
Sensitivity: AM: ? uV (10 dB S/N)
FM: 0.18 uV (12 dB SINAD)
Selectivity:FM: 12 KHz (-6 dB)
Image rejection:
AF output power/speaker:? W at ?% distortion / 8 ohm
External speaker connector:3.5 mm

RF output power: 4 W (Standard)
8 W (Export mode)
Modulation system:
FM deviation:2 KHz
Spurious emissions:Less than -? dB
Microphone impedance/connector:? ohm / 6-pin (Metal locking ring connector)
Microphone input sensitivity:? mV

Manufactured:Korea, 1998-200x (Discontinued)
Main PCB: Early version: M40E034E by Maycom Co. Ltd.
Improved version (Late 2003): M40E233A by Maycom Co. Ltd.
Sub PCBs:
Additional info: Early version has orange backlight while later version is green.
I know of at least two revisions of the PCB; the early one had a
backup battery that was prone to leakage. This was later improved
on by a change to supercap backup.
See also Cherokee CM-10, President Harrison, Stabo XM7082 DTMF and Zodiac M-3000
Related documents: User manual (2.6 MB, page 24 missing)
Schematic (96 KB) - Early version
PLL/CPU: LC72338
RF driver (Early): KTC1006
RF driver (Later): 2SC2314
RF final (Early): KTC2078
RF final (Later): 2SC2078
Sams Photofact #:None
Modifications and fixes:
Reviews:Radio Today: August 1999
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An inside picture of Maycom EM-27
A rear picture of Maycom EM-27