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Philips FM92E Manual

Philips FM92E Manual

Conversion to 6 meters
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PHILIPS
FM92E
Conversion
To
6 Meters
Ver 3.9 -
21 Apr 2007
Rod McCosker VK2DOT
Philips FM92E Conversion to 6 Meters:
Version 3.9
Page 1

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  • Page 1 PHILIPS FM92E Conversion 6 Meters Ver 3.9 - 21 Apr 2007 Rod McCosker VK2DOT Philips FM92E Conversion to 6 Meters: Version 3.9 Page 1...

  • Page 2: Introduction To Project

    1: Introduction to Project: This paper is a rough guide for the conversion of a Philips FM92E band transceiver to 6 meters. This project is for the Central Coast Amateur Radio Club’s Tuesday Nite Group. The information contained within this document is derived from other Australian 6 meter conversion projects plus our own experimentation.

  • Page 3: Table Of Contents

    35. Making my FM92 sound better: (transmit audio) . 36. Tuning up an FM900: ………………………………………………………………. 37. FM900 Field Personality Programmer (FPP) Guide: . 38. FM92E Test EPROM 68-88 Mhz Channel verses Frequency List: ………….. 39. Repairing FM92 VCOs . 40. 6 Meter Antenna: ……………………………………………………………………...
  • Page 4 Check Sum = F4FF NOTE: You must determine what IF your FM92E is using. This will determine what EPROM to use. The IF frequency is normally located on the side panel of the VCO under RF/BW. It will be either 10.7 or 21.4 MHz.
  • Page 5 OTHER FILES: Fpp.zip = Software for generating channel verses frequencies for Philips FM92E for 6 Meters. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 5...

  • Page 6: Philips Fm92E Background

    Band VHF, 25 watt output ( E band, 66-88 Mhz model) The FM-92 is part of the Philips FM-900 series, there are also FM-91 and FM-93 models. It comes in E, A, T, U, W1 & W2 band versions.

  • Page 7: A Little History

    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-Philips 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.

  • Page 8: Just A Few Notes, Hints, Tips And Tricks Which Don't Fit Anywhere Else

    All models have provisions for add on modules or "options" as Philips calls them. Selcall Type 1 Selcall Type 2 CTCSS Encode CTCSS Decode CTCSS Encode / Decode CTCSS Encode / Decode and Reverse tone burst ( Reverse tone burst )

  • Page 9: Cleaning Up An Fm-900 To Make It Look Good

    • It may be necessary to brush the circuit boards with a clean paint brush. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 9...
  • Page 10 • blow or brush out any dust • spray the PTT contacts with WD-40 or similar, wipe off any excess • Reassemble and wipe with "Mr Sheen" or similar. Finished! Philips FM92E Conversion to 6 Meters: Version 3.9 Page 10...

  • Page 11: Meter Fm92E Fm Frequencies

    9: 6 METER FM92E FM FREQUENCIES Ch Scan Rx 1 1 52.525Mhz 52.525Mhz Voice Main Calling Frequency 52.550Mhz 52.550Mhz Voice Simplex for Repeater # 42 52.575Mhz 52.575Mhz Voice Simplex for Repeater # 43 52.600Mhz 52.600Mhz Voice Simplex for Repeater # 44 52.625Mhz 52.625Mhz Voice Simplex for Repeater # 45...
  • Page 12 52.900Mhz 53.900Mhz Voice Reverse for Repeater # 56 52.925Mhz 53.925Mhz Voice Reverse for Repeater # 57 52.950Mhz 53.950Mhz Voice Reverse for Repeater # 58 52.975Mhz 53.975Mhz Voice Reverse for Repeater # 59 Philips FM92E Conversion to 6 Meters: Version 3.9 Page 12...

  • Page 13: Equipment Supplied

    0.63mm [B&S 22] Enamelled Copper Winding Wire. [Jaycar WW-4018] will cover aprox 20 sets. • 12 Volt 10 Amp Power cable. • 1 of 100K ohm potentiometer. Jaycar # RT-4366 Philips FM92E Conversion to 6 Meters: Version 3.9 Page 13...
  • Page 14 1 of 270 pF R2295 1 of 270 pF RC5329 NOTE: We will cover the “Equipment Required” at the night of the first lecture, so do not purchase anything before attending this lecture. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 14...

  • Page 15: Initial Check

    Go to the nearest Mhz of one of the frequencies [68 – 88 Mhz]. • Go to the channel Number for that Mhz on the chapter 38 “FM92E Test EPROM 68-88 Mhz Channel verses Frequency List:” by the up/down buttons.

  • Page 16: Faults

    Otherwise it's most likely that you've cooked an output transistor if the right dot comes on, since these radios are only made to run with a duty cycle of about 5%. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 16...

  • Page 17: Speaker Socket Change

    14: Speaker Socket Change: This change is only conducted if you are converting a Philips FM92E local control head and do not intend to use the rear 5 pin for the speaker socket. NOTE: The FM900 remote head has a built in speaker, thus this change is not necessary.

  • Page 18: Initial Pull-Apart

    15: Initial Pull-Apart: • Remove top & bottom covers from Philips FM92E transceiver. • Place top & bottom covers into A4 plastic GLAD bag. • Place all screws into small plastic GLAD bag. 16: Board Layouts: RF Board: • All boards are hinged from the front.
  • Page 19 Synthesiser Board: Philips FM92E Conversion to 6 Meters: Version 3.9 Page 19...

  • Page 20: Eprom Change

    Remove cover on Synthesiser board side from the FM92E Transceiver, this is the side closest to the two sockets at the rear of the FM92E transceiver. Then mark the cover with your call-sign, then place it & the cover’s screws into their GLAD bags & mark your Glad bags with your call sign. Should be a minimum of 5 screws.
  • Page 21 • See below for pictures of Synch board [top & bottom] where to place EPROM. Synthesiser Board [Bottom View] Philips FM92E Conversion to 6 Meters: Version 3.9 Page 21...
  • Page 22 Synthesiser Board [Top View with cans on] Synthesiser Board [Top View with cans off] Philips FM92E Conversion to 6 Meters: Version 3.9 Page 22...

  • Page 23: Using The Club's De-Soldering Station

    Do all pins for each module. Then unscrew the two holding screws for each module and gently lever each module off the receiver board. Note: Too much pressure can break a pin or several pins. Philips FM92E Conversion to 6 Meters: Version 3.9...
  • Page 24 Apply to the surface to be de-soldered with a small brush, old toothbrush or icy pole stick. We have found that a wooden tooth pick has been the most successful method of applying the Bugs Juice to the pin requiring de-soldering. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 24...

  • Page 25: Vco Change

    Receiver Board [bottom view] NOTE: You must determine what IF your FM92E is using. This will determine how to wind the VCO Main coil. The IF frequency is normally located on the side panel of the VCO under RF/BW. It will be either 10.7 or 21.4 MHz.
  • Page 26 Receiver Board. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 26...
  • Page 27 As you score the sides, watch your fingers. The scoring causes small slivers of solder to be formed, dispose of these slivers as soon as possible. Philips FM92E Conversion to 6 Meters: Version 3.9...
  • Page 28 Remember – gently twist the screwdriver, you do not want to break the ceramic PCB. You can use the right hand soldering iron of the de-soldering station with success. Too much heat and components on the ceramic board will start to fall off. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 28...
  • Page 29 You should remove the enamel coating on the wire and "pre-tin" the wire with solder before fitting, this will ensure a good electrical connection for the coils. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 29...
  • Page 30 Refit the old offset coil [now 8 turns] into the main’s coil position. • Don’t forget to use a hot glue gun or other method of securing the two coil formers to the ceramic board. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 30...
  • Page 31 VCO module including the VCO PCB with coils are fitted back to the “Receiver Board”. This method is probably the best for mobile operations, however if you intend to use your FM92E converted to 6 meters, then the second method is easier.
  • Page 32 Replace VCO block back onto main PCB. Screw in 2 screws, then solder pins to board. NOTE: In the above operation be very careful of the PCB pins, they bend & break very easily. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 32...
  • Page 33 8: Plug in VCO PCB into the Receiver Board and check that it is upright. Solder the VCO PCB to the board. Check that the soldering is ok. Clean the back of the receiver board with mentholated spirits where you have just soldered. See picture below. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 33...
  • Page 34 Screw VCO module to Receiver board with the two screws. The tuning will have changed when you replace the VCO module can. So continue on with “VCO Tune” on next page. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 34...

  • Page 35: Vco Tune

    [channel 1] and check to make sure the VCO test point voltage is above 4 Volts DC on both RX & TX (we found ours to be around 5.6 - 7 volts). Philips FM92E Conversion to 6 Meters: Version 3.9...
  • Page 36 NOTE: Be care-full, when you press the microphone button, you can transmit 5 watts. As a final test, with channel 20 setup on the FM92E connect your signal generator to 53.000 MHz. You should hear a signal through the FM92E with approximately 100 mVolt of signal.

  • Page 37: Rx Rf Amp/Mixer Change

    21: Rx RF Amp/Mixer Change: Rx/Mixer Coil Side. Rx/Mixer PCB Side. Rx/Mixer PCB Side. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 37...
  • Page 38 When 12 turns completed, hold down wire with glue from hot glue gun. Cut wire at the 12 turn mark. [just added] Or; strip all wire & wind on 54.5 turns. Earth bottom of coil. With tap 2.5 turns from earth. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 38...
  • Page 39 When 11 turns completed, hold down wire with glue from hot glue gun. Cut wire at the 11 turn mark. [just added] Or; strip all wire & wind on 53 turns. Earth bottom of coil. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 39...
  • Page 40 Strip all wire from all coils and, keep the wire previously stripped. • Clean coil tops & bottoms, plus clean module coil inserts from old glue. • File down and clean all earth connections on block. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 40...
  • Page 41 Original Rx Coils Cut out 50% of the two partitions between coil #1 & coil #2; Plus between coil #3 & coil #4. With a pair of tin snips. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 41...
  • Page 42 10mm to be cleaned. ● Solder both ends of 0.8mm wire. ● Bend 8mm of the 0.8mm wire at [10mm tinned end] at right angles. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 42...
  • Page 43 If you are conducting this conversion remote to the club, then check with GDO that the coil resonates at 53.25 Mhz. Adjust the ferrite in the coil to go to that frequency. [look at note below, if this point is applicable] Philips FM92E Conversion to 6 Meters: Version 3.9 Page 43...
  • Page 44 • Solder original wire to RF amplifier output connection on rear PCB side of Rx Module. Use a pair of tweezers to help you. [see solder points on page 28] Philips FM92E Conversion to 6 Meters: Version 3.9 Page 44...
  • Page 45 However if you are using different dimensioned wire or a different sized capacitor, then you should check everything with a GDO. Remember, when you place the coil into the Rx Module, the resonant frequency of the coil changes. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 45...
  • Page 46 Connect a 53.25 MHz signal generator to a 53.25 MHz receiver or Spectrum Analyser and note the measurement out of the signal generator. [ie setup the signal generator to say Micro Volts.] Philips FM92E Conversion to 6 Meters: Version 3.9...
  • Page 47 Disconnect original wire from Coil 4 to the Mixer Input pin on the Mixer PCB. • Connect the removed wire to a 53.25 MHz receiver or Spectrum Analyser. • Check that the RF amplifier is working. See Below: • Philips FM92E Conversion to 6 Meters: Version 3.9 Page 47...

  • Page 48: Rx Rf Amp/Mixer Tune

    Adjust the RF coil for the best signal to noise ratio. Keep the signal generator at the threshold of noise during the adjustment. This adjustment should result in the mute lifting for a signal above 0.5 uVolts. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 48...

  • Page 49: Pa Changes

    7 = Tx PA input from VCO Buffer. Coax [25 mW In @ 50 ohms] 8 = Tx PA output (Top Left Corner) Bare Wire [25 W output @ 50 ohms] Philips FM92E Conversion to 6 Meters: Version 3.9 Page 49...
  • Page 50 FM91E PA Board above view. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 50...
  • Page 51 Above is a spectrum analysis of the signal from the FM92E Synthesiser VCO Buffer Output [pin 18] to the transmitter board input via coax with the Transmitter OFF and the Receiver on. The IF in this case is 10.5 MHz.
  • Page 52 Philips FM92E Conversion to 6 Meters: Version 3.9 Page 52...
  • Page 53 Unsolder RF output wire from PA Board. Unsolder five of wires from chassis feed through pins. Unsolder two of coax lines going to PA board from PA board. Unscrew screws holding PA board to chassis. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 53...
  • Page 54 Philips FM92E Conversion to 6 Meters: Version 3.9 Page 54...
  • Page 55 Philips FM92E Conversion to 6 Meters: Version 3.9 Page 55...
  • Page 56 L110 0.80mm L111 No change L112 No change L113 No change L114 0.80mm L115 0.80mm L116 0.80mm L117 No change L118 0.80mm L119 0.80mm L120 0.80mm L121 0.80mm L122 0.63mm Philips FM92E Conversion to 6 Meters: Version 3.9 Page 56...
  • Page 57 68 pF C144 470 pF 120 pF solder beneath board; lay flat. REMEMBER: Do not remove capacitors C128, C144 and C127; you place the extra capacitors underneath the PA board. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 57...
  • Page 58 Above is PA Board - left section, at bottom of Screen: New Capacitors: Above is PA Board - right section, at bottom of Screen: New Capacitors: Philips FM92E Conversion to 6 Meters: Version 3.9 Page 58...
  • Page 59 . Jaycar # - Remove the 50K ohm potentiometer and replace with a 100K ohm potentiometer. The original FM92E transceiver converted to 6 meters, lacked deviation adjustment and for those who know the circuit, this increases the loop gain of the exciter.
  • Page 60 If you have a deviation meter, connect it and speaking very loudly into the microphone (counting to 10) adjust R367 for a maximum of 5khz. • If you have a channel programmed as low power, the adjustment is R403 Philips FM92E Conversion to 6 Meters: Version 3.9 Page 60...
  • Page 61 24: Removal of the annoying BEEP from the FM92E: One of the first things that will strike you when you operate a Philips FM92E is the annoying beep when you change channels. Remove the covers so the bottom (solder) side of the Synthesizer board can be seen. This is the board under the plastic sheet.

  • Page 62: Fm92R Source Listing

    Precautionary note: We are informed that this mod will disable some functions such as CTCSS, etc. Normally, the FM92E will not go into "scan" mode unless the microphone is in its cradle. A magnet in the cradle latches a reed switch in the microphone housing, to enable the scan feature.

  • Page 63: Fixing "Tinny" Transmit Modulation By Adjustment

    30: Fixing "tinny" transmit modulation by microphone modification: Simply "flip over" the microphone insert. Truly! This places a "baffle" (the back of the insert) between you and the microphone element, which helps to reduce response peaks. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 63...
  • Page 64 No CTSS -------------------------------------------------------------------------------------- 12.5 Local CTSS ENC ZVEI T2 SelCall T2 ENC Only --------------------------------------------------------------------------------------- 12.5 Remote CTSS ENC/DEC EEA T2 SelCall T2 Enc Only --------------------------------------------------------------------------------------- Mobile EIA T2 ENC Only --------------------------------------------------------------------------------------- Philips FM92E Conversion to 6 Meters: Version 3.9 Page 64...

  • Page 65: Fm92E Rear Connectors

    2 Power Ground 3 Mike Ground 4 Speaker 5 Mike Active 6 RX Audio out 7 PTT 8 Not used Pinout are as viewed from rear of plug. 33: 15 Pin Cable: Philips FM92E Conversion to 6 Meters: Version 3.9 Page 65...

  • Page 66: Philips Fm 900 Series Service Notes

    34: Philips FM 900 Series Service notes: [compiled by Andy Beales VK4KCS] Symptom: Radio keys up when P.T.T. is operated but although the "Tx" light stays on, only a brief moment of power out is observed. The loudspeaker makes a faint "squeak" whilst this output power is present.
  • Page 67 Most solvents/cleaners available will take the carbon film from the moving contact if applied, so use the pencil and then brush the residue out with a small artists brush (the adjective refers to the brush not the artist.) Philips FM92E Conversion to 6 Meters: Version 3.9...

  • Page 68: Making My Fm92 Sound Better: (Transmit Audio)

    2. Adjust R365 (microphone sensitivity) on the synthesiser board about 90 degrees, or until it sounds about right anticlockwise with the PCB in place, or clockwise from the component side. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 68...

  • Page 69: Tuning Up An Fm900

    Wind the mute to minimum. If the set is 'ticking' the VCO is out of lock. Undo the screws holding the radio board in and hinge it out. Find test point 201 Connect your volt meter between TP201 and ground. Identify the VCO slugs. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 69...
  • Page 70 L1 (the slug in the centre of the board) through to L6 until the receiver is sensitive enough. See previous picture for location .You can use a SINADDER or by ear. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 70...
  • Page 71 If you have a deviation meter, connect it and speaking very loudly into the microphone (counting to 10) adjust R367 for a maximum of 5khz. If you have a channel programmed as low power, the adjustment is R403 Philips FM92E Conversion to 6 Meters: Version 3.9 Page 71...

  • Page 72: Fm900 Field Personality Programmer (Fpp) Guide

    Hardware Code made up of eight digits: (ie: ABCDEFGH) The hardware code for a FM92E with remote head for 6 Meters = 92240000 A - always 9 for FM900 mobiles B – 1 = High Simplex (FM91) 2 = Medium Simplex (FM92)
  • Page 73 2 = dual front end 3 = ignition noise blanker Software Code made up of 15 Digits: The software code for a FM92E with remote head for 6 Meters = 110404200000000 A – Channel Display 0 = intermittent display 1 = continuous display...
  • Page 74 * Cannot select economiser and voting on same channel * Cannot select economiser and selcall on same channel * Cannot select selcall and scanning on same channel * Must have more than one channel in a vote group Philips FM92E Conversion to 6 Meters: Version 3.9 Page 74...
  • Page 75 “myfreq”, you will find a file called myfreq.bin in the directory x:\fpp\fm900\jobs\myfreq\ Take this file, and copy it to your root directory and then using whatever EPROM burning equipment/software you have, write this file to the EPROM. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 75...
  • Page 76 1FE2, 1FE3 & 1FE4 from the start of the file, and the checksum, see note below. Location 1F64 appears to be a data checksum for the whole data stored on the EPROM. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 76...

  • Page 77: Fm92E Test Eprom 68-88 Mhz Channel Verses Frequency List

    38: FM92E Test EPROM 68-88 Mhz Channel verses Frequency List: 6Mtest1L.bin = Local Head Test EPROM 10.7 MHz IF. 6Mtest2R.bin = Remote Head Test EPROM 10.7 MHz IF. 6Mtest3L.bin = Local Head Test EPROM 21.4 MHz IF. 6Mtest4R.bin = Remote Head Test EPROM 10.4 MHz IF.

  • Page 78: Repairing Fm92 Vcos

    The most sensitive area was around the Rx coil. When I removed the slug an extremely small piece of broken slug fell out. This fixed the problem. There must be a moral here somewhere. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 78...

  • Page 79: Meter Antenna

    40: 6 Meter Antenna: Philips FM92E Conversion to 6 Meters: Version 3.9 Page 79...

  • Page 80: Weekly Procedures

    Remove cover on Synthesiser board side from the FM92E Transceiver, this is the side closest to the two sockets at the rear of the FM92E transceiver. Then mark the cover with your call-sign, then place it & the cover’s screws into their GLAD bags & mark your Glad bags with your call sign. Should be a minimum of 4 screws.
  • Page 81 Tuesday nite. If they were off-frequency [Ken (VK2KJ) will recheck your FM92E transceiver again], we will change your EPROM. Those that were given the short FM92E, we will change them back to the long FM92E that was converted from the batch of FM91E’s.
  • Page 82 July 2007 - Continue with week 12 June 2007. Philips FM92E Conversion to 6 Meters: Version 3.9 Page 82...

  • Page 83: Philips Fm91 Schematic Diagrams

    42: Philips FM91 Schematic Diagrams: Philips FM92E Conversion to 6 Meters: Version 3.9 Page 83...

  • Page 84: Meter Repeaters

    Cooma, SE NSW cancelled Jan 2003 53.825 52.825 VK7RAD Hobart QE37 Jan 2007 53.825 52.825 VK7RNW Lonah, NW Tas moved, now VK7RMD 53.825 52.825 VK7RMD Mt.Duncan,NW Tas Op Dec 2006 ----------------------------------------------------------------------------------------------------------------------------------------------------- Philips FM92E Conversion to 6 Meters: Version 3.9 Page 84...
  • Page 85 53.050 VK2IO BBS Sydney 1200bps 53.100 VK2RPH Sydney Nth 1200bps 53.100 VK3RUG 1200bps 53.100 VK3RMG Seymour/Yea 1200bps 53.100 VK4BOO-1 BBS Sunshine Coast 1200 & 2400bps 53.100 VK4RBP Atherton Tablelands 1200/2400 Philips FM92E Conversion to 6 Meters: Version 3.9 Page 85...

  • Page 86: Version Amendments

    30. VCO test – check with signal generator, page 36. VCO Tune - VCO Tune Check References: added & pin 19 check of VCO, page 37. Renumber of all pages after page 36. Philips FM92E Conversion to 6 Meters: Version 3.9...

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