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Page Updated 18 Jan 2005

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Stornophone 4000

The Storno CQP4000 was introduced in 1982 as a 2 channel, 2 Watt handheld radio with optional tone signalling. The model was soon further developed to provide more channels and later variants allowed for trunked system operation.

Design features

The CQP4000 was designed to minimise the number of separate parts. The radio chassis formed a screened enclosure housing the RF and control logic boards connected by printed flex to the metalised plastic keypad and display panel which fitted over the front. This chassis sat in a plastic housing that held the battery and also retained the PTT switch actuator - the one moving part of the radio.

Technical Developments

The CQP4000 models were all synthesised, microprocessor controlled units using surface mount components and featuring a backlit liquid crystal display. All channels, tones and personality features were programmed into a PROM or EPROM. The trunked MPT1327 version was the first MPT portable on the market.


System capabilities

The standard CQP4000s had a range of tone signalling options and 2 digits of the encode telegram could be changed from the keypad. The automatic versions were available for more advanced systems such as the CAF2004, PhoneNet and StarNet trunked systems and special versions included custom units for the British Rail National Radio Network.

CQP4000 2 Channel

The first Stornophone 4000 models only supported two channels and these versions could easily be distinguished by their rather colourful keypads.

CQP4000 10 Channel

Later models, as identified by their less colourful keypads were available with up to 10 channels. They also had the option to be operated using a remote speaker/mic.


CQP4000 Automatic

Introduced in 1985, the automatic and later trunked system radios had an 8 digit LCD display, battery backed RAM and greater programming flexibility using an EPROM for the main program. Unit ID and other personality information could be programmed via the keypad using a service mode.


Introduced in 1987, the mark 2 had the same radio chassis as the mark 1 but the plastic case had a squarer, more rugged feel. The main differences were around the bottom of the case which eliminated the risk of the battery being pushed out and made the unit less likely to fall over when standing upright.


The ten channel CQP4000 also became manufactured in the Mk2 ruggedised format and in 1988 was also available rebranded as the Motorola HT300 model.
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