Last updated 27/10/1999

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After much searching on the 'net I have found a few places with FM900 info on them, however they take a lot of jumping from one site to another to find everything you are looking for. So with many apologies to all concerned (I will list as many of the sites as I can at the bottom of the page) here is a compilation of all the best parts, images, eprom binaries etc... that i have collected. I personaly have a W1 band FM92R and a W1 Band FM91, so most of the information I have collected is biased towards these models. Also I am being sent the FULL service manual for the FM91, each page is scanned and saved in .TIFF format and I will make this available here as it arrives. All files will be less than 1 Meg in size, both for download speed and the fact that is the maximum file size on this server!!

BTW....Don't think we here in Australia are alone with these wonderful beasts, I received e-mail from
Jan Buiting PE1CSI from Sibbe in The Netherlands about an FM913 on 2M and an FM906.

The Info....

For those considering purchasing an Phillips FM900 series radio, and are confused by the band codes used, the band plan is as follows:

E Band radios are Lo Band VHF covering 68-88 MHZ: This is the one to convert to 6M
B Band radios are Hi Band VHF covering 132-153 MHZ: These are fine for 2M amateur
A Band radios are Hi Band VHF covering 148-174 MHZ
T Band radios are UHF covering 403-420 Mhz
U Band radios are UHF covering 440-470 Mhz
W1 Band radios are UHF covering 470-500 Mhz: These are the ones for UHF CB use
W2 Band radios are UHF covering 500-520 Mhz

The 8 Pin microphone socket pin-out is as follows:

For those who wish to scan (or use tone mute) and do not have a magnetic microphone clip, a simple modification is as follows. Open your standard fist mic, locate the steel strenghtening plate at the rear which supports the mic hanger clip, and clean the coating from a small portion of it, (I scraped mine with a screwdriver 'till it was shiny). Then solder a short length of wire to this point, and solder the other end to the pin where the blue wire joins the pc-board. Then all you have to do is to run a ground wire from your radio, or the power supply running the radio, to your standard mic clip. All the reed switch/magnet combo do is to short the blue (cradle) wire to ground, so this is just another way of doing the same job.

This one came through the FM900 Mailing list, a word document describing one way to have 4 banks of frequencies stored in the the one eprom and how to switch between them Click here!
Another offering from the FM900 Mailing list is a couple of schematics, the
microphone preamp and associated wiring, and also the 8pin and 5pin sockets on the base unit.

Why not
subscribe to the FM900 Mailing list, a source of heaps of usefull information and others interested in these fine radios.

A little history....

In the early eighties, Philips Australia started producing a commercial radio for the Australian and international markets. The radios came in various configurations and frequency bands. They where constructed from a one piece die-cast enclosure, with ether a local control face plate or remote control head. The circuitry is contained on 3 main boards (RF, CPU and  PA), PCB's are double sided FRG4 fibreglass. All of the components are through hole except the SMT parts mounted on ceramic hybrid SIP's. The whole construction is extremely ruggedised and very solid. The FM900 series came in 3 basic models (FM91, FM92 and FM93). It also came in some special/custom variants and also a waterproof model FM97.

The FM91 is intended as the high end 120 channel model and only came in a remote head version. It has a numeric keypad, function, scan, site, send keys, digital mute and volume, it also has an eight digit seven segment red LED display, most options are programmable from the head.

The FM92 was the standard 40 channel radio (up to 99 CH's), it came in 2 variants, local head and remote head. It has channel up/down, aux and send buttons, analog mute and volume. The display consists of two seven segment red LED display. The radio can be programmed with almost the same options as the FM91 but it's not changeable from the front panel. The remote head also has a built in speaker. This is the most common FM900 series radio.

The FM93 is the low end 10 channel baby. It has channel up, aux and send buttons, analog mute and volume. The display is a single seven segment green LED display. It only came in a local head version and differs considerably from the other FM900 series radios, in that it's a servery striped down version, utilising cheaper receiver section and different PLL. It also lacks an A-D chip, therefore it can't facilitate some functions, mainly voting. Sometimes these units actually have FM92 PCB's installed, but they can only display channels 0-9.

The FM97 is basically a waterproof FM92 with an FM91 CPU board. It only came in a remote version, the head was made from a white die-cast jiffy box, it uses Mil-spec bayonet connectors and high quality push button switches with waterproof boots. It has volume up/down, channel up/down, mute, a, b, c function buttons. The display consists of 4, 7 segment red LED displays. According to information from an ex-phillips employee they were designed for police motor bikes!!

The only real deference between the FM91 / FM97 and FM92 is that the FM92 has a standard volume control pot, but the FM91 / FM97 has a 4 bit digital audio attenuator hybrid instead.

All models are based on the Motorola MC146805 CMOS micro controller, and normally have an 8k (2764) EPROM. The EPROM contains the program code and channel data.

All models have provisions for add on modules or "options" as Philips calls them.

The Files....

The much asked for E band to 6M amateur conversion is
HERE!!! This is scanned images from the AR magazine articles and also the 6 Meter Eprom image files for both local and remote radios.

Here is an image of the receiver board, showing the resistor to cut to attenuate (by about 95%) the channel change beep and off cradle scan alarm tone.
Click here

Here is the 5 pin speaker socket pinout (also works for the socket on the rear of the remote head)
Click here

This is a picture of the UW FM90 Duplex Board Module

Here is the image of the synthesiser board
Click here

This is the pinout for the "umbilical" cable that connects the remote head to the main body
Click here

Here is a variable gain (hi/lo) receive preamp for both the VHF and UHF radios
Click here This is really SMALL!!!, it is built on a piece of vero-board 12 holes by 5 holes!!!

Here is the Field Personality Programmer for download (FPP.EXE is a self extracting zip)
Click here This file also includes the updated FM93 Master file for those having trouble programming these radios. NOTE: This creates the binary images for any eprom programmer to work with, the one used in the software is an add-on card available only from Phillips/Simico, the files created work fine with the eprom programmer listed below.

This is a copy of Pascal's S-Meter for FM900 Page I have built one and it is great!!!

This is a great "do it yourself" parallel port
eprom programmer to "burn" your own eproms from FPP image files.

For those who want just the image files for UHF CB, here they are for:
FM92 Remote Head
FM92 Local
The Channel Allocations for the above files

Here is a link to David Griffiths'
AFI900 Software Site , a very nice extended re-programming of the eprom, adds HEAPS of cool features, I love the scanning options.

FM 91 Service Manual

The circuit diagrams are BIG (1.85Meg), I have used arj.exe (version 2.41)to split them into "sub 1Meg" blocks, to comply with this servers limits, use the command arj x -v "filename".arj to re-create it as one picture.
This is the first of the pics, Fig 7.13
Here is Fig 7.2
Here is another one,
Fig 7.1 (It has 3 in it, a,b,c)

List of blank pages not included in files (so you don't panic when printing it all out!!)
Part 1 of the FM91 Service Manual
Part 2 of the FM91 Service Manual
Part 3 of the FM91 Service Manual
Part 4 of the FM91 Service Manual
Part 5 of the FM91 Service Manual
Part 6 of the FM91 Service Manual
Part 7 of the FM91 Service Manual
Part 8 is the diagrams mentioned above!!
Part 9 of the FM91 Service Manual
Part 10 of the FM91 Service Manual
Part 11 of the FM91 Service Manual
Part 12 of the FM91 Service Manual
Part 13 of the FM91 Service Manual
Part 14 of the FM91 Service Manual

The Credits

S-Meter Circuit courtesy of
Pascal, VK2IHL
Gifs and mic wiring courtesy of
Michael, VK2XMD
E Band to 6m conversion courtesy of
Northern Corridor Radio Group (WA)
Eprom Programmer courtesy of
Andrew McCubbin
FM91 Service Manual courtesy of
Kevin Forbes, Capt Nimrod
The really nice pic at the top of the page is courtesy of
David Griffith
The Information about the FM900 Series was taken from
The pre-amp came from the same source,
The Duplex Board piccy came from
Andrew Dennis

Other Links.... mostly dead

Comments/Corrections to Chris Hogan