View Full Version : What contact for the external antenna on A920?

07-06-2004, 11:29 PM
I have an A920 which I use in a basement and therefore would like to add an external antenna, like the ones available for GSM.

Since none is yet available, my first step is to use my old GSM-antenna which with some tests seems like it have some positive effect.

The problem is to find a plug/contact that fits the RF-connection on the back of the A920. Motorola refuses to answer and points to Three - and Three just doesn´t know...

Does anybody know the name of the connection, and maybe even where it is possible to get them? Anyone with experience of external antennas for 1800 & 2100 band?

16-06-2004, 05:39 AM
I have lifted this straight from another forum so can't vouch for it's accuracy. Author plasma_d00d:
The MMCX series is also called MicroMateTM. It is Amphenol's smallest RF connector line and was developed in the 1990's. MMCX is a micro-miniature connector series with a lock-snap mechanism allowing for 360 degrees rotation enabling flexibility in PCB layouts. MMCX connectors conform to the European CECC 22000 specification.

The micromate family of products is a 6 GHz 50 Ω interconnect system. A range of connectors are available including surface mount, edge card, and cable connectors.

Features & Benefits

Broadband performance with low reflection DC to 6 GHz, providing a high-quality solution at a low cost

Quick connect/disconnect snap-on mating reduces installation time

Conforms to European CECC 22000 specifications

Available in straight and right angle plugs and printed circuit board connectors


Antennas Base stations Broadband communications
Cable assemblies Components GPS
Instrumentation PCMCIA cards Radio boards
Satcom Telecom

MMCX Specifications

Electrical CECC 22000 Test Requirement
Impedance 50 Ω
Frequency Range DC - 6 GHz
VSWR 4.4.1
SMT & Edgecard Cabled
DC - 4 GHz: 1.15 max Straight semi-rigid: 1.15 max
4 - 6 GHz: 1.40 max Straight flex: 1.20 max
R/A semi-rigid: 1.20 max
R/A flex: 1.25 max
Dielectric withstanding voltage @ sea level 4.4.5 500 V rms, 50 Hz
Dielectric working voltage @ sea level 4.4.4 = 170 V rms, 50 Hz
Insulation Resistance 4.4.4 = 500 MΩ
Center Contact Resistance 4.4.2 = 10 mΩ
Outer Contact Resistance 4.4.3 = 5 mΩ

Mechanical CECC 22000 Test Requirement
Engagement force 4.5.4 = 3.4 lbs
Disengagement Force 4.5.4 1.4 lbs to 3.4 lbs
Contact Captivation 4.5.2 2.3 lbs
Durability 4.7.1 = 500 cycles

Leads Beryllium copper with gold plating per QQ-C-530
Contact Socket Beryllium copper with gold plating per QQ-C-530
Outer Conductor Beryllium copper with gold plating per QQ-C-530
Housing (SMT) Liquid crystal polymer
Insulator PTFE per ASTM-D1457

Environmental CECC 22000 Test Requirement
Temperature Range -40° C - + 90° C
Temperature Shock 4.6.7 MIL-STD-202, method B
Humidity 4.6.6 MIL-STD-202, method 103, test condition B
Vibration 4.6.3 3 cycles, 3 opposite directions, 10-150 Hz, 10-60 Hz: 0.75 mm/.030 in., 60-150 Hz 10 G's
Mechanical Shock 4.6.4 MIL-STD-202, method 213, test condition B
Note: These characteristics are typical but may not apply to all connectors.

13-08-2004, 11:36 AM
Hi Confucious,
I am sorry to say that the MMCX-contact is much too small to fit the A920. I bought one and tried. And I have still not found out what kind of contact it is.

Thanks anyway,


10-11-2004, 05:35 PM
Have you found out what kind of contact it is? I have a Motorola A1000 that I would like to attach an external antenna due to poor reception@work.

Anyone, please enlighten us!


10-04-2005, 02:31 AM
Have you found out what kind of contact it is? I have a Motorola A1000 that I would like to attach an external antenna due to poor reception@work.

Anyone, please enlighten us!


Anyone had any luck working out the connector. My A1000 also has this conenctor for both the GPS and bluetooth but cant work out what it is and I want to put an antenna onto the phone. Anyone?

10-04-2005, 01:25 PM
has anyone tried using something like this (

18-11-2005, 03:45 PM
Guys from told me the a1000 has a MMCX connector, so I bought a MMCX antenna at around 20$.

It does not fit!
I didn't know this thread, unfortunately. I confirm that a1000 has NOT an MMCX connector, which is quite smaller than the a1000's one!

I wonder how to connect my cable to that connector... any idea?