Conversion of Emergency Service Radios
256 channel 12.5KHz spacing AM only.
256 channel 12.5KHz spacing AM / FM.
10 channel 25 KHz spacing UHF FM repeater set.
VHF-UHF control box.
BE536 256 channel AM only 143 Ė
156 MHz and 71 MHz. Some 2000 sets
BE540/A4 VHF-UHF repeater mobiles. Some
3250 bought Circa 1985
BE544 256 channel AM / FM
143 Ė 156 MHz and 71 MHz.
Probably the nicest sets to mod for 2metres.
BE536 AM only. But
easily modified to FM by adding 10 components to the existing unused FM
discriminator chip and noise limiter IC. Makes
the receiver AM / FM switchable or FM only.
Transmitter easily can be converted to FM by feeding attenuated AM audio
into the synthesized oscillator and hence wobbling it up and down.
As per the standard conversion of a Burndept-DYMAR M2080 synthesized set
256 channel capability with easy to push up and down flip switches.
AM / FM version 256 channel ***GOLD
Identical set to the BE536MU but dual mode AM / FM.
No conversion required. Change
the two EPROMís and straight on 2
metres. Both sets can be used with
the BE540 VHF-UHF talk-through control box, to give a crossband 2 metre / 70 cms
repeater facility. If used with a
Pye w15ut talk-through Westminster UHF or a BE540
20 watt 10 channel crystal controlled Westminster replacement set.
Ideal for RAYNET purposes......
If you have no EPROMís available to put the set on a 2 metre frequency, you
can fit in the EPROM sockets two 8 way bit switches and switch the address lines
up and down to get the synthesizer on to 2 metres, to test the set and control
box out OK. A toggle switch can be
fitted to switch AM / FM per channel or why not have 128 channels AM and 128
channels FM in pre programmed EPROMís.