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MU 904-X/…

colinear 4 dB Mobile Antenna for the 900 MHz Band
Description
  • 4 dB mobile antenna with black-chromed, stainless steel whip.
  • 3 models, type “l”, “m” and “h”, cover band segments suiting the most common 900 MHz CELLULAR networks such as EAMPS, ETACS, NMT-900 and EGSM.
  • Stainless steel X-mount with M6-thread whip-fastening system.
  • Simple mounting exclusively with access from the outside.
  • Models available with X-mount (oblong), CX-mount (circular) and MM-mount (magnetic).
  • Choice between two connection principles:
  • X-mount, MM-mount: FME-connection (supplied without cable).
  • XP4-mount: Permanently attached 4 m low loss cable terminated with FME-connector.
Specification
Electrical
Model MU 904-X/…
Frequency 900 MHz-band covered by three models
Antenna Type Collinear mobile antenna
Max. Input Power 60 W
Polarisation Vertical
Impedance 50 Ω
VSWR ≤ 1.3 @ f. res.
Bandwidth ≥ 50 @ VSWR ≤ 1.5
≥ 100 @ VSWR ≤ 2.0
Gain (EIA RS-329-1) 4 dB
Mechanical
Materials Whip : Stainless steel and brass, black-chromed
Mount : Black-chromed brass
Weather- and shockproof plastics
Stainless steel
Installation Torque 4 ±1 Nm
Colour Black
Historic Brand Amphenol Procom
Antenna Mount Type Hole Mount, Magnetic Mount
Height Approx. 350 mm / 13.78 in.
Weight X-version : Approx. 70 g / 0.15 lb.
XP4-version : Approx. 210 g / 0.46 lb.
MM-version : Approx. 320 g / 0.70 lb.
Mounting 18 mm dia. hole
Ordering Codes
Model Product No. FrequencyAdditional Information

MU 904-X/l

 130001167 824 – 894 MHz (EAMPS) X-mount (oblong) with FME-system

MU 904-X/m

 130001172 872 – 950 MHz (ETACS) n/a

MU 904-X/h

 130001159 880 – 960 MHz (EGSM & NMT-900) n/a

MU 904-CX/l

 130001168 824 – 894 MHz (EAMPS) CX-mount (circular) with FME-system

MU 904-CX/m

 130001173 872 – 950 MHz (ETACS) n/a

MU 904-CX/h

 130001160 880 – 960 MHz (EGSM & NMT-900) n/a

MU 904-XP4/l

 130001170 824 – 894 MHz (EAMPS) XP4-mount (oblong) with 4 m cable + FME-connector

MU 904-XP4/m

 130001175 872 – 950 MHz (ETACS) n/a

MU 904-XP4/h

 130001161 880 – 960 MHz (EGSM & NMT-900) n/a

MU 904-CXP4/l

 130001171 824 – 894 MHz (EAMPS) CXP4-mount (circular) with 4 m cable + FME-connector

MU 904-CXP4/m

 130001176 872 – 950 MHz (ETACS) n/a

MU 904-CXP4/h

 130001162 880 – 960 MHz (EGSM & NMT-900) n/a

MU 904-MM/l

 130001154 824 – 894 MHz (EAMPS) MM-mount (magnetic) with FME-system

MU 904-MM/m

 130001155 872 – 950 MHz (ETACS) n/a

MU 904-MM/h

 130001153 880 – 960 MHz (EGSM & NMT-900) n/a
Additional Information
Installation

This antenna should be mounted on the car roof to ensure best omnidirectional coverage.Mounting can take place exclusively with access from the outside when drilling an 18 mm dia. hole.

Mounting can take place from the inside by drilling a 14 mm dia. hole. When mounting in a 14 mm dia. hole, remove the bottom plastic ring of the packing gasket with a sharp cutter.When cleaning the car in car-washing machines, remove the whip using a spanner, size 9 mm. After wash, refit the whip and tighten it lightly with the spanner.


As the X- and CX-mounts are internally equipped with a bendable section, the antenna can always be adjusted to an upright position independent of the tilt angle of the installation spot (up to 30° tilt).
The MiniMag (abbreviated: MM) is a small, light-weight magnetic mount with a high attaching effect. A silicone layer applied to the contact surface protects the car roof and ensures maximum friction.
Antennas with magnetic mount should be mounted at the centre of the vehicle roof to ensure best omnidirectional coverage.

1. Installation Dimension

X CX MM Mount ø18 ø72 GB

2. Installation Steps

XG Mount inst step samlet GB

Do not use sealer on rubber gasket or other places.

3. Tuning

The antenna is delivered factory-tuned and requires no further tuning.

Please Note

For safety reasons :

  1. When using the MU 904-MM/…, car speed must not exceed 150 km/h.
  2. If operating the MM-mount with other whips, whip length must never exceed 320 mm, and utilizing this maximum length, car speed must not exceed 115 km/h.
The whip is compatible with all below mounts

X XP4 CX CXP4 MM Mount GB

PROCOM A/S reserves the right to amend specifications without prior notice
PROCOM A/S • Smedetoften 12 DK 3600 Frederikssund • Denmark
Generated : 2026-06-27 Version 1