FM92 VFO Upgrade

Unlock the potential of your FM92

The Philips FM92 VHF commercial radio has found its way into the hands of many amateurs. It makes an excellent 2 metre rig.

Until now, the FM92 has displayed a 'channel number', which has made amateur operation painful, as there are several versions of the channel number to frequency table currently in use, resulting in confusion between operators and the need to carry a 'cheat sheet' of channels.

This situation has now changed, with the UDM900 VFO chip for the FM92. This firmware displays the frequency and repeater offset, as well as providing a host of new features making the FM92 even more useful in the amateur bands.

The VFO chip is a drop-in replacement for the EPROM in the FM92 local and remote head variants. No I/O expansion chip or hardware changes to the radio are required.

The UDM900 firmware has the following features:

• 25kHz channel spacing over whole 2m band.
• Step frequency up and down by 25kHz, 100kHz and 1MHz steps.
• WIA band plan for repeater offsets.
• Displays frequency rather than channel number.
• Four predefined scan groups of eight channels each.
• One scan group of three programmable channels.
• Scan up / Scan down capability between two limits.
• Key selectable repeater positive, negative, reverse or simplex modes.
• Temporary channel barring in a scan group.
• Ability to step on in a scan group using the keyboard.
• Selectable wait or continue on a busy scan channel.
• Signal strength (S meter) display.
• Display blanking - for night time use.
• Low transmit power mode (if hardware power control option fitted).

You don't need the NSC810 I/O expander option.