Here you will find a selection of Japanese 903 to 905Mhz sets. The 934MHz allocations in the UK and Switzerland both had some sets modified from this allocation. So this is a glimpse of what we could have had. These “Personal Radio” sets are still used in Japan (although the band is now withdrawn) and are know as Orange tops as all antennas had to have an orange top. This tradition was evident in the UK also, as the antennas imported from Japan and sold by the likes of Nevada the importers of the Delta 1 set had orange tops.
Radios must be equipped with a control ROM for Auto-Callsign and Digital ID by 1200bps/4800bps MSK. The Rom had to be applied for and registered when purchasing the set.
However illegal expansion Roms were available which bypassed the registration and also expanded the channels to many hundreds. (see the manual mod section of this site)
Personal radio
| Test Item | Technical regulation,etc | |
| Class of emission | F2D F3E | |
| Assigned frequency or designated frequency | 903.0125(C-ch) 903.0375-904.9875MHz | |
| Number of channel or spacing | 158 12.5kHz interleave | |
| Frequency error (x10-6) | 3kHz (2) | |
| Occupied bandwidth tolerance | 16kHz (13) | |
| Spurious emission intensity tolerance | Over 1W | -60dB |
| 1W or less | 25µW | |
| Antenna power | Specified value | 5W or less |
| Error | +20% -50% | |
| Maximum frequency deviation, shift | ±5kHz (3.5) | |
| Adjacent channel power tolerance | — | |
| Leak power with carrier turned OFF | — | |
| Signal transmission rate | — | |
| Overall operating characteristics | Total flow | |
| Other equipment than transmitter/receiver | Calling and storage device | |
| Note or other test items | Value in the parentheses represents PRPC standards. Control signal frequency deviation:2.55 Antenna Gain:7.14dBi or less Horizontal plane non- directive | |
