User manual
IMPACT MK3 Hand Held UHF Paging Transmitter 
HHTXMK3  Issue 1 
  2 
PREFACE 
Important Installation Information 
It is the purchasers’ responsibility to determine the suitability of this equipment and its derivatives for any 
given application, Scope cannot give specific advice in this manual, as each use will require independent 
evaluation. 
Scope has, wherever possible, employed extra safeguards to monitor the system’s performance. Certain 
system installations, operational requirements or budgets may, however, limit the effectiveness of these 
safeguards. Again, the suitability of the system for any given application must therefore be decided by the 
installer and their customer, relative to the application and risk. 
Good working practice dictates that a suitable system installation log must be generated, together with a 
record of the dates when the system has been manually checked, (with the aid of signal strength meters 
etc.) enabling the system performance to be compared with the original installation data. 
For UK equipment, Scope has no control of the use and application of the frequencies issued by 
OFCOM. Some equipment that is licensed may have greater protection than other equipment which is 
operated on a WT Act License Exempt basis. 
The supply of this equipment is governed by our standard terms and conditions of sale, which can be 
found on the reverse of all order acknowledgements*, proforma invoices*, delivery notes, price lists and 
invoices. Alternatively, these can be provided on request. 
* Faxed proforma invoices and quotations refer to “conditions available upon request”. 
Important Safety Information 
Scope products are designed to operate safely when installed and used according to general safety 
practices. The following requirements should be observed at all times. 
Do NOT subject this equipment to: 
Mechanical shock 
Excessive humidity or moisture 
Extremes of temperature 
Corrosive liquids 
This equipment is designed for indoor use, unless expressly stated otherwise, and must not be used in 
classified Hazardous Areas, including areas containing explosive or flammable vapours, unless express 
authorisation has been given in writing by the manufacturer. If in doubt, consult your local product dealer 
for further information. 
Do not obstruct any slots or openings in the product. These are provided for ventilation to ensure reliable 
operation of the product and to protect it from overheating. 
Only use a damp cloth for cleaning (not liquid or aerosol based cleaners), and ensure that any power is 
removed from the unit prior to beginning the cleaning operation. 
Removal of covers from the equipment must only be undertaken by authorised service personnel, who 
must ensure that power is isolated prior to removal. 
Battery Charging 
The Nickel Metal Hydride batteries fitted in Scope portable transmitters are optimised for safety and 
performance and are NOT accessible or replaceable by the user. Where it is suspected that the batteries 
are faulty or if they refuse to maintain a charge, the equipment must be returned to Scope for servicing 
and battery replacement. The transmitter unit must only be re-charged using the charger receptacle and 
AC adaptor provided by Scope. Use of other adaptors or chargers will invalidate all warranties and may 
result in damage to the equipment and/or injury to the user. In all such cases, Scope expressly excludes 
liability for any damage or injury, howsoever caused. 










