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ICOM HM-133V

RM 150.00

The HM-133, HM-133S and HM-133V are variations on each other for particular radios. While Icom has updated the internals of the microphones and modified the key labeling to tailor it to a particular radio, from a protocol standpoint they all operate the same. The first of the series seems to have been the HM-133S, which (according to the HM-133S Users Guide), is an evolution of the Icom HM-98.Please see the Icom HM-98/HM-133 Internals page for details on the protocol and such.


The three HM-133 variants are:


  • HM-133 (IC-208H, IC-2820H, IC-2725E, IC-2720H)
  • HM-133S (IC-2100H)
  • HM-133V (IC-2200H, IC-V8000)


Other Details:


  • The HM-133S is electrically identical to the HM-98, but with a different key layout
  • The HM-133V comes in two versions, one that is electrically equivalent to the HM-133S, and one that is electrically identical to the HM-133 (which I call the HM-133V(A))
  • Outwardly there is no way to tell the difference between the two, and functionally they are all identical, differing only in key labeling
  • Curiously, in the HM-133V(A) and in the HM-133, there is a 24L02 256x8 EEPROM
  • This might be used by Icom to give the microphone a 'profile' of some kind
  • One might hope that it's used to program the PF1 and PF2 keys, but those are actually key sequences sent to the radio
  • At this point, I have no idea what the EEPROM is actually used for
  • The older microphones use a μPD7564AG 4-bit microprocessor with a 1KiB masked ROM.
  • The new microphones use a μPD789071, which appears to be a Z80 core with 2KiB of masked ROM
  • Datasheets for each of these parts may be found on the Icom HM-98/HM-133 Internals pag

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