Friday, 19 September 2014

Choosing a covert wireless earpiece


ICM40

The ICM40 is the standard induction loop earpiece suitable for most applications. For every 100 induction loop earpieces purchased the ICM 40 account for 95 pieces.


The technical specs for the ICM40 are available on our website listing.

The earpiece is available in Beige, mid brown and dark brown shades.



ICM100
The ICM100 is the same earpieces as the ICM40 with the addition of a noise gate or Squelch system.
The squelch prevents any  magnetic signal below a certain pre set level from being reproduced as audible sound.


If however the induction noise is such a level that it would break through the squelch it will be still be heard as audible noise.
In this scenario a Digital earpiece, the DCM40,  should provide the solution.

DCM40



The DCM40 Digital earpiece has a tailored 300Hz to 3kHz audio response that will eliminate most mains noise (50Hz) and Hi End Car Data management (10kHz+)  interference.
Noise encountered inside the speech range will still be heard.
The DCM40 also has a limited audio level output of 96dB.

Induction Loop Earpieces - How they work.


Theory
The output audio signal from a Walkie Talkie, Tetra radio or Presenter's earpiece Box is passed through a conductor typically a personal neck loop or Shoulder Pad.  When the signal is passed through the neck loop it produces a magnetic field.

The magnetic field produced by the neck loop varies in strength according to the audio wave form being passed through it.
This variation in the magnetic field causes a small current to be induced in a tiny coil housed in the wireless earpiece.  This is then amplified (hence the need for a small pill battery to power the amplifier) and passed into a transducer which converts the signal from the coil to an audible sound. The sound is then passed down the molded delivery tube out of a little apeture hole and into the ear.

 A blue wax guard may be present at the sound outlet hole in the earpiece. This helps prevent wax blocking the sound outlet. Under very hot conditions any wax present can liquify and via the process of capillary action run up the sound passage into the transducer, coil and amplifier to solidify. The earpiece quickly becomes an expensive write off and the warranty does not cover this damage. Not even the wax guard can prevent this so this is an important reason to maintain good ear hygiene before inserting a wireless earpiece into your ear.

Key points of Induction Loop Earpieces
The  process involves no radio frequencies.
The sound level heard by the listener of the earpiece is dependant
  • The output level of the radio (volume control on radio)
  • The match between the radio output (or other device) and the neck loop or shoulder pad.
  • The amplifier gain setting in the earpiece.
Showcomms' neck loops and ICM 40 earpieces have been tailored by our manufacturer to provide consistently good results in most conditions on most radios.  The neck loops use high efficiency coils and the amp is optimised for a higher output.


Interference.
This is generally encountered as low level buzz or hum and can increase the closer the proximity to the source of interference.  Induction loop earpieces are susceptible by their very nature to unwanted magnetic signals that can be produced by other electronic devices. Sources of possible magnetic include High Volltage, Electronic, switching equipment, electric motors, fluorescent light fittings dimmers and computers.

Monday, 15 September 2014

London Chamber of Commerce and London City Airport Visit

Proud to be members of London Chamber of CommerceWe are pleased to announce our Membership of the London Chamber of Commerce this September.

Our first activity with the London Chamber of Commerce was a behind the scenes visit to London City Airport with other members of the chamber.

London City Airport offer an impressive delivery service standard of just 7 minutes from Check in to security and only 15 minutes from check in to gate.  The terminal manager showed us the 2nd generation Check in Machines through which passengers can scan their barcode from their mobile and check in.  The airport control room is able to monitor the flow of passengers and respond to peaks to ensure their service delivery target times are maintained.    For me London City Airport is now the only true London Airport. It has to be time saving option for the City and Canary Wharf.



 

Thursday, 11 September 2014

Welcome to Belgium Police Zone Ath

Police Zone Ath 
Local Police Zone Ath are our latest Local Belgium Police Zone to order headsets for their officers.
Each August a festival Les VĂ©pres de Gouyasse is held in Ath (Aat).The Festival portrays the marriage of the Giant Goliath.  


The 20 foot giant Goliath and his lady are paraded through the streets. After they lumber through the streets to the Church of St. Julien, Goliath and his lady are married.

Showcomms supplied 38 BG-THR Kevlar 1 wire acoustic tube headsets with microphone for Nokia THR880i radios to Ath Police just in time for the 2014 celebrations.


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