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Pye pegasus M252 vhf mobile radiotelephone + keypad
working pye pegasus m252which comes with its keypad module as well part of a recent mod clearence.Be sure to add me to your favourites list!Be sure to add me to your favourites list!CRYPTIENSIS 2004 ELECTRONIC SURPLUS
The M252 Pegasus was a simplex or duplex, VHF mobile or transportable radiotelephone designed by Mobile Lab4 in the early 1970s, and based on the M202 FM Olympic electronics modules. It was designed to meet a specification from the British Army Royal Signals for a ruggedised VHF mobile for non-combat applications such as military policing, home defence, etc. operating in the VHF low band frequencies (66 - 88 MHz - Pye 'E' band). It was later (in 1981) developed to operate in the 148-174 MHz and 132-156 MHz PMR radiotelephone bands. It is pictured here mounted in the man-portable battery powered kit.
Where the standard M201/M202/M212 Olympic used a die-cast aluminium frame to house a single motherboard and multiple plug-in daughter boards, the M252 used a cast aluminium platform chassis which allowed for double sided construction and two mother boards. This gave space inside the set for up to 18 channels of TX and RX crystal oscillators, a twin-head receiver option and various selective calling options. See internal view of the main radio section fitted with twin head receiver modules and also a view of the other side of the chassis where the 18 channel oscillator PCBs are located, along with sockets for internal selective calling units etc.
The M252 was designed to be water resistant to 'Driving Rain' standard similar to the later IEC/IP54 specification, and rugged enough for use in a wide range of military vehicles, motorcycles and helicopters. The original design was extensively tested on the MOD Blandford ranges strapped underneath a Chieftain tank, but is not believed to have ever been used in that particular configuration in anger!
The M252 Pegasus was a member of a large family of mobiles, base stations and accessories designed for use by the military, and the mobile unit could be configured in many different ways to suit the individual contract. Pegasus system product leaflet to follow.
The mobile was a 12 Volt dc powered equipment, and for use in 24 volt vehicles the M200 Olympic VR200 voltage dropping unit was available. The Pegasus mobile unit could be vehicle mounted, or slotted into a battery powered transportable fitted with a nickel-cadmium battery pack. (This model was later replaced by the FM914PM version of the FM900 mobile) The chassis casting had provision for two antenna sockets and a version of the set was capable of duplex operation, including talk-through.
When the MOD failed to purchase the expected large quantities of the M252, the extensive development work on the design (which included water proof castings, interconnect cables and control heads) was used to create various commercial versions of the equipment. The commercial waterproof version was called the Beaver (M254 local control version, M256 remote control version), and was finished in a yellow/black colour, similar to that used for heavy earth-moving plant and construction site equipment. The non-waterproof commercial version was called the M258 FM Olympic and was finished in a blue/black color scheme.
A wide range of industry standard selective calling facilities were available for mounting internally in the radio unit, including: 5 tone sequential (in-band audio tones referred to as 5-tone), continuous tone coded squelch system (sub audio band tones referred to as CTCSS). External encoder/decoder units for the Mould system could also be connected via the external facility socket. External 16 bit digital encryption units to full military standard were also used for some applications.
Standard frequency range: 68 - 88 MHz, 148-174 MHz, 132-156 MHz
Transmitter RF output: 5 - 15 Watts FM adjustable
Primary model variants: simplex, duplex, twin head, extended control/second operator control, transportable version, motorcycle version
