Alison Microwave Ltd.

Designer and manufacturer

of robust-high-performance

GPS antennae and ancillaries

 

 

 

 

Alison Microwave Ltd.

12 Chapel Road

Lingwood

Norfolk

NR13 4NY

United Kingdom

 

 

sales@amlant.co.uk

 

Telephone: +44 (0) 1603 211876

Facsimile:   +44 (0) 1603 211536

Co.Reg. in England & Wales

No.1976804

 

Products

 

1. GPS and DGPS Antennae

2. Splitters

3. In Line Amplifiers

4. Iridium and RBGAN satellite antennae

 

1. GPS and DGPS Antennae

 
   
  • AML active antennae for GPS and DGPS reception incorporate hard anodised milled aluminium bases with 4mm thick GRP radomes, giving strength and superb corrosion resistance. Titanium bases with glass radomes are used for the deep sea submersible antennae, which are produced in partnership with Nautilus Marine Service GmbH.

  • The antennae elements are either dielectric patches or crossed dipoles optimised in conjunction with their radomes. The elements are matched and have right hand circularly polarised (RHCP) radiation patterns that are uniform in azimuth and offer good reception down to 5 degrees in elevation.

  • Standard antennae can be rendered inoperable due to interference close to the GPS and DGPS frequencies, a problem that will arise increasingly as the RF spectrum becomes more crowded. AML manufacture ranges of antennae with integral low-loss comb and interdigital filters, which are significantly better at suppressing near band interference than those with standard ceramic filters.

  • Each antenna has a low noise amplifier with an overall noise figure including filters of less than 3dB and a factory preset gain in the range 20 to 45 dB. Supply voltage is 3.3V to 20Vdc at typically 35mA. Other gains are available on request.

  • An independent evaluation of AMLís L1/L2 range of interdigital filtered antennae obtained decimetre precision using a high precision DGPS spot-beam service, a performance that compares favourably with those of antennae from other manufacturers. (Interdigital filters assist continuity of DGPS reception during high precision measurements).

  • All antennae are EMC approved, compatible with a wide range of GPS/DGPS receivers and tested against an appropriate reference model prior to dispatch.

  • JP614460-01 certification for selected antennae (AD410, AD420, AD490) representative of mechanical, filter and amplifier configurations used across full product range.

  • AML antennae are designed and manufactured in house using state-of-the-art facilities.  Consequently, custom requirements ranging from modification of existing products to the development of new antennae can be met efficiently.

       

          Description 

Filter

Pass-band (MHz)

Model

GPS antennae (for reception at 1575.42 MHz)

     

 

Standard GPS antenna with central stud mounted TNC connector on 90 mm (3.5") diameter base

Ceramic

1575.42 (centre)

AD221

 

Standard GPS antenna with N-type connector on 90 mm (3.5") diameter base

Ceramic

1575.42 (centre)

AD251

 

Filtered GPS antenna with 150mm (6") diameter ground plane

Interdigital

1570-1580

AD430/7080

 

Deep sea submersible antenna

Ceramic

1575.42 (centre)

AD450

 

DGPS antennae (for reception in the frequency range 1530 to 1560 MHz)

 

DGPS antenna with 150mm (6") diameter ground-plane

Comb

1530-1560

AD420/3060

 

DGPS antenna with 150mm (6") diameter ground-plane

Interdigital

1530-1541

AD430/3141

 

Basic DGPS antenna

Comb 1530-1560 AD316/3060

 

Combined GPS and DGPS antennae

(1530 to 1575.42 MHz)

 

GPS/DGPS antenna with 150mm diameter ground-plane

Comb

1530-1580

AD420/3080

 

Dual frequency antenna with 185 mm (7.5") diameter ground-plane

Dual Interdigital

1531-1541

1570-1580

AD440/

31417080

 

Submersible antenna with a comb filter for the frequency range 1530 to 1580 MHz.

Comb

1530-1580

AD480/3080

 

Basic DGPS/GPS antenna

Comb 1530-1580 AD316/3075

 

GPS and GLONASS combined antennae

(1575.42 to 1610 MHz)

 

Combined antenna with 150mm (6") ground-plane

Comb

1570-1610

AD420/7510

 

GPS L1/L2 dual frequency antennae

(1227.6 and 1575.42 MHz)

 

Standard L1/L2 antenna

Ceramic

1227.6, 1575.42 (centres)

AD410

 

Deep sea submersible version of AD410

Ceramic

1227.6, 1575.42 (centres)

AD470

 

GPS L1/L2 and DGPS combined antennae (1227.6 and 1530 to 1575.42 MHz)

 

Antenna with dual frequency interdigital filters

Dual interdigital

1222-1232 

1530-1580

AD490

 

Antenna with triple frequency interdigital filters,

as AD490, but also incorporating L1/L2 GLONASS reception

Triple interdigital

1217-1254 

1530-1541

1558-1611

AD491

GPS/DGPS and UHF combined antennae

Drone antenna with integrated receiver and UHF radio modem. The antenna element acts as both a receiver for GPS and a tuned transmitter for the radio modem at 458 MHz with no compromise to its electrical performance at either frequency.

Dual interdigital

1531-1541

1570-1580

AD400

Antenna for use with external  DGPS/GPS receivers and a UHF radio modem. The L-band and UHF frequencies are multiplexed enabling connection to the antenna with a single coaxial cable. An optional splitter is used  to separate the signals at the receivers.

 Dual interdigital

1531-1541

1570-1580

AD500

Antenna for use with external  DGPS/dual frequency L1/L2 GPS receivers and a UHF radio modem. The L-band and UHF frequencies are multiplexed enabling connection to the antenna with a single coaxial cable. An optional splitter is used to separate the signals at the receivers.

Triple

interdigital

1222-1232

1531-1541

1570-1580

AD540

 

Antenna for use with external GPS receiver, with low frequency (1.6 to 3.2 MHz) DGPS beacon reception  and a UHF radio modem. The L-band, UHF and low frequencies are multiplexed enabling connection to the antenna with a single coaxial cable. An optional splitter is used to separate the signals at the receivers. Build and appearance identical to AD500

 

Ceramic

(Interdigital optional)

1575.42

(centre)

AD530

GPS/DGPS and 2.4GHz combined antennae

 

Specification as AD440, with 2.4 GHz antenna.

Antenna for use with external  DGPS/L1 GPS receivers and a 2.4-2.483 GHz modem. The frequencies are either multiplexed enabling connection to the antenna with a single coaxial cable, or a separate connector can be provided for 2.4GHz . An optional splitter is used to separate the signals at the receivers.

   

 

Specification as AD490, with 2.4 GHz antenna.

Antenna for use with external  DGPS/ L1/L2 GPS receivers and a 2.4-2.483 GHz modem. Options as above.

     

      2. Splitters

  • These units are used to feed an antennaís output to the GPS and/or DGPS inputs of one or more receivers. Active (with typically unitary gain) and passive splitters are available, with a DC pass through or block for each of the ports as required. Isolation between outputs is better than 20dB.

Description

number of outputs (n) Model

Passive splitter

2,4,8, or 10 way AD325/P/n

Active splitter

2,4,8 or 10 way AD325/A/n

 

  • A long cable run between an antenna and receiver leads to significant signal attenuation and as a consequence in line amplification may be necessary. AML manufacture in line amplifiers typically with preset gains of 10 dB and 20 dB, with either a DC supply pass through (AD200/8) or a DC block (AD200/9) as required. It is recommended that the amplifier is placed near the beginning of the cable run.

Description

Gain (dB) Model

In line amplifier with N-type connectors, 5 to 20V dc supply at 15mA maximum

10 AD200/8/10 AD200/9/10
  20 AD200/8/20 AD200/9/20

Disclaimer: This site provides a summary of AML products available from March 4th 2008 and may contain errors. Please contact AML for confirmation and prices. 

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