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LH 108/136

Diplexer for Car Radio and Mobile Telephone

Description

Diplexer for simultaneous operation of mobile telephone and car radio on a common mobile telephone antenna.
Diplexer for Car Radio 0 – 108 MHz and Mobile Telephone bands with 3 options:
LH 108/136-1G covers 136 – 1000 MHz
LH 108/136-2G covers 136 – 2300 MHz
LH 108/136-2G-3FME covers 136 – 2300 MHz
Extremely small dimensions.
Quick installation using dual-adhesive pad provided.
FME-connections on antenna and transceiver terminals
75 Ω (M10 x 0.75) or 50 Ω FME connector on the car radio terminal.
1 m or 5 m Procom 75 Ohm car radio cable available as an option.

Specification

Electrical
Model	LH 108/136-1GLH 108/136-2G
Frequency	Mobile telephone : 136 MHz – 1000 MHz Car radio : 0 – 108 MHzMobile telephone : 136 MHz – 2300 MHz Car radio : 0 – 108 MHz
Max. Input Power	136 – 500 MHz : < 35 W 500 – 1000 MHz : < 15 W136 – 500 MHz : < 35 W 500 – 1500 MHz : < 15 W 1500 – 2300 MHz : < 10W
Insertion Loss	0 – 108 MHz : ≤ 2.0 dB 136 – 144 MHz : ≤ 0.8 dB 144 – 1000 MHz : ≤ 0.7 dB0 – 108 MHz : ≤ 2.0 dB 136 – 144 MHz : ≤ 0.8 dB 144 – 2300 MHz : ≤ 0.7 dB
Impedance	COM : 50 Ω, VSWR < 1.5:1 Radio : 75 Ω CRC or 50 Ω FME, VSWR < 1.5:1
Isolation	≥ 40 dB typ. ≥ 45 dB RADIO to COM: > 38 dB at 108 and 136 MHz

Environmental
Operating temperature range	-30 °C to +70 °C

Mechanical
Connection(s)	COM : FME Radio : CRC-Connector (M10 x 0.75) or FME Antenna : FME
Historic Brand	Amphenol Procom
Dimensions	50 x 21 x 60 mm / 1.97 x 0.83 x 2.36 in.
Weight	Approx. 0.068 kg / 0.15 lb.
Accessories	Car radio cable Type 1 m CRC (length 1 m) Type 5 m CRC (length 5 m)

Ordering Codes

Additional Information

The 50 Ω cable between antenna and diplexer should be kept as short as possible (preferably not over 1 m).
Some communication antennas have insufficient height to ensure satisfactory broadcast reception. Only antenna whips with a height of at least 25 cm are acceptable.
Tuning: The antenna is tuned for best VSWR at the operating frequency as usual. The filter is factory-tuned and ready for installation.
The car radio is tuned for optimum reception on the MW-band by means of the antenna tuning screw (if present).

LH 108 136 Diag GB

PROCOM A/S reserves the right to amend specifications without prior notice

PROCOM A/S • Smedetoften 12 DK 3600 Frederikssund • Denmark

Generated : 2026-06-26 Version 1