Electronic Service and Manufacture better known as Elsema is an industry leader in manufacturing the latest and greatest in communications components, remote controls, gate and door automation technologies and more. Founded back in 1973, Elsema is a privately owned Australian brand that has grown steadily throughout its 50-year history.
Although there are only 40 employees, the efficiency and work ethic of the company have stood the test of time and made this Aussie brand to visit when you need wireless solutions. No matter if it’s for communications or automation Elsema has it all with their receivers being one of their most popular products.
Common Elsema Receivers
GLR43301
Elsema’s range of Gigalink receivers starts with the GLR43301 in this case which is a 433 MHz, single-channel device that has a built-in test switch. With this 8 amp Elsema receiver, you get a current consumption of 16 mA on standby and a supply voltage between 11 V and 28 V AC/ DC. The GLR43301 has a sensitivity better than 1µV for its relay output switch on. The device measures 96 x 70 x 20 mm and it’s able to store an unlimited number of transmitters.
GLR43302
Next in line is the GLR43302 which comes with two channels and a 32-bit encryption of digital code which makes it quite a safe and capable device. With it you get the same 8 amps for the relay outputs as you do on the rest of the Gigalink receivers on here as well as the 433 MHz receiving frequency. The GLR43302 has the same dimensions as the GLR43301 and it can be used with Elsema’s GLT433 series transmitters. You can also select between momentary, latching and security latching modes on the GLR43302.
GLR43303
With the GLR43303 you get the same amp rating, current consumption and supply voltage as the above two receivers but you also get 3 channels which are crystal controlled for better reliability. The storage options are available too as well as the same modes and the highly sensitive receiver input stage which surpasses 1µV. What’s different about the GLR43303 is its dimensions which come in at 130 x 70 x 20 mm. The same Elsema transmitter series can be used with this receiver as it has the same ANT 433 MHz antenna.
GLR43304
The GLR43304 has two relay outputs that case switch currents of up to 8 amps each and it has the ability to sort through 4 billion code combinations. The supply voltage of the GLR43304 can be both in AC or DC power while it houses the same antenna and offers the same output modes as the above-mentioned receivers. You can find programming instructions for this and the rest of these receivers on their website and you can use the GLR43304 with the same Elsema transmitter series too.
GLR43304240
Just like the GLR43304 the GLR43304240 has the same number of channels which is 4. But the GLR43304240 is rated for a supply voltage of 240 V and it comes with a current consumption of 2.2 mA on standby. The receiving frequency and relay output are the same though but the dimensions and application of this receiver aren’t. It comes in at 160 x 70 x 30 mm and it’s made for use in winches, industrial automation, crane control and wireless cement truck operation.
GLR43302240
Using the GLR43302240 means you can connect it to the mains supply as it supports 240 V and it also comes with the same 32-bit encryption for its data storage as the rest of the receivers. There is also an E version of the GLR43302240 available which comes with a weatherproof case which makes it that much more versatile than its 4-channel counterparts. But since this is a 2-channel Elsema receiver it means you get a smaller device which is 130 x 70 x 37 mm big.
Types of Receivers
Superheterodyne
A superheterodyne receiver is one that is able to mix the frequency of the signal it receives with that of the signal that’s generated by a local oscillator. Thus the output of this receiver is a lower fixed frequency which is called an intermediate frequency.
Direct Conversion
Also called a homodyne receiver, a direct conversion receiver that is able to demodulate the radio signal that’s being received. This is done with the help of synchronous detection which is operated by a local oscillator with a frequency either close or identical to the carrier frequency of the signal that’s to be used.
AM & FM
AM and FM receivers are able to process incoming signals in a way that it comes out in the form of audio. Hence why both AM and FM receivers are used in radios in your car and home. They are unique to this use as they only convert the frequency to an audio signal as they have an audio amplifier alongside a demodulator and an IF filter.
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