(also named ATR221)
You will find çi-after some information which will enable you to modify with less expenses Radio operator Telephone VHF pro TMF 220 of Thomson to pass it Emission/Réception in the Amateur band from 144 to 146 MHz. F5JTZ.Frontage of the apparatus.....
Sight of outside.
Radio operator standard telephone THOMSON TMF220 (or ATR221) is a mobile apparatus functioning in 12 volts and in the band of the 150 MHz. That-çi is of color black. Its case is out of aluminium, and its moulded plastic frontage. Its dimensions are: - Largeur:185 mms. - Hauteur:65 mms. - Profondeur:240 mms. - Power emission: 3, 6, 12, 15 and 25 Watts. (according to modifiable version.....et at will)Orders of frontage...
On left and from top to bottom. The indicators Works... Busy... Emission.....Appel... Then and always of left on the right... If the aircraft were equipped with it, the wheels coders of the selective calling or then of the masks. Below 2 cursors. The first for blocking of Horn, and the second for Squelch. Then the Marche/Arrêt button, and Bf volume. Then the switch of channels (16). And in the last the microphonous catch (with exit HP).Back of the apparatus...
Of left on the right: A catch of exit for various accéssoires. The electric cable. Catch BNC for the antenna.And interior.....
The apparatus side view.....The amplifier...
The unit... multiplying reception... MF...... head VHF... synthetisor.
- TMF with or without selective. - Order postal and telecommunications authorities - order postal and telecommunications authorities. - Pin 21 of the MC145151 - Pin 6 of the MN206 - the synthetizer. - How walk you it?? - In the sharp one of the subject - Diagrams... - Overall picture of the synthé turntable. - Correspondence supports STAKES and 145151. - Dimensioned Emission... - Some values and reference mark. - catches. - Wiring of the micro catch. - Wiring of the back catch. - Wiring frontage towards printed circuit. - Some utilities. - Download some tools for: - the calculation of the step of synthé - To create your complete table of Frequencies - Thank you with... - Conclusions.
TMF with or without selective During the acquisition of your TMF 220, it is possible that you had a version which is provided or not with the selective calling. In the case of the use as an Amateur, it will not be useful to us. We will have to thus remove it, and to carry out the maid connected after the withdrawal of that-çi.
If the apparatus is WITHOUT selective... If you acquired a version of TMF220 WITHOUT selective calling...... the modifications will be relatively reduced. You can see on the photograph of the free connectors.- It is on the left about the connector J04 (8 fils).....il must be free. - Then a small connector with 2 wire, which is J07... it is the connection of the High speaker towards the Micro catch. You can withdraw it, or preserve it if you leave the HP by the micro catch. - You will thus have only the connector J206 which has 5 wire to be extracted. It is that which is on the right beside the supports of GREEN color. It is the order of the 2 integrated circuits STAKES which were used in PRO. It is possible to preserve this connector industry if you use the switch with 16 channels to control the synthetizer by an one-way circuit. For example a PEAK...... (projet in progress)
If the apparatus is WITH selective... First of all you should open the TX.(C' east can be already made) Ensuite made a little location..... The frontage towards you, platinizes it synthetizer is under your eyes...... easy to locate, there is a large integrated circuit towards left.....C' is the MC145151.
Under this turntable you will find that of CALL SELECTIF. - a connector with 5 wire is practically located at the vertical of the MC145151. - a second connector is visible almost opposite the micro catch, always under the turntable of the synthetizer. Thus withdraw platinizes it selective. To extract the connectors J04 (8fils), J07 (2 wire), J206 (5fils). For information: - J04........est the interfacing with the selective system. - J07........est the exit High Speaker towards the micro catch. - J206...... is the ordering of the 2 STAKES for Mc145151.The length of the cable was planned for that. When this operation is made you thus gave in service: - the Emission part - the Bf reception - postal and telecommunications authorities.
Order postal and telecommunications authorities... Pin 21 of circuit MC145151 corresponds to the shift of Emission/Réception..Information postal and telecommunications authorities is dispo on supports MN205 and MN206 in leg 14. It passes to state 0 in reception and state 1 in emission Another place for the postal and telecommunications authorities is on the circuit of the Amplifier. ATTENTION:En X-ray there is 12v on this pin, and it passes to 0V in Emission. It will imperatively be necessary to use a diode in your control circuit to avoid a return. 
The synthetizer... The TMF 220 is controlled by a synthetizer whose circuit is well-known of all the MC45151 from Motorola. It is him the heart of the machine. With the origin the frequencies are given by 2 named integrated circuits STAKE, which were (or are still) on the supports of green color. - How walk you it. The broad outline: - Synthé controlled by a Quartz 3.2 MHz and a series of dividers to arrive on pin 27 of the MC 145151 to 100 Khz. (On the side stability the pros do not joke - the step of synthé. It interests us and of near. A glance around the 145151 enables us to see that pins 5 (RA0), 6 (RA1), and 7 (RA2) are with the mass. What gives us a report/ratio of division of 8 Frequency Dividing Oscillator / = Not Small calculation...... 100 / 8 = 12,5 Khz. (100 Khz is the frequency clock injected into the circuit with pin 27). Perfect, there will not be to modify this part as well as the dividers, nor to change quartz. - the shift Emission / Réception is made by 2 integrated circuits STAKE. This is why pin 21 of the MC145151 which gives the shift of 10,7 MHz between the Emission and the reception is not used in version PRO. It will be given in service in Amateur version - Synthé recovers on its pin n° 1 the frequency of the VCO. That-çi functions in low frequency, and comes then chains multiplying by 5 then by 2 for the Emission. In the current case there is Qrg of 15.53375 MHz on the leg n° 1 of the 145151..... Therefore you will have at the final exit this frequency multiplied by 10 is 155.3375 MHz. (the frequency of entry on leg 1 of the MC145151 is identical to Qrg of the VCO) There is no circuit pre-divider as on some other Tx.
In the sharp one of the Subject... - To extract the 2 integrated circuits STAKE (reference MN205 and MN206) (It east can be already done) - nothing to put at the place of circuit MN205. (It is that which is readiest of the MC145151.) - For a support with 16 pins which it is necessary to put at the place of MN206, it will be necessary to make following wiring: - To join together pins 2, 3 and 5 on mass 8. - pin 6 on the leg 14 of this same support. - pin 21 of the MC145151 on leg 5 of the MN201. - pin 21 of the MC145151 towards leg 3 of J04 or on the chart amplifier through diode 1N4148 or other. Seen on the support which has the straps. This makes it possible to be on Qrg Emission / Réception of 145.087.5 MHz.
- a rapid controls on pin 28 of the 145151 makes it possible to see whether there is always the tension of 8 volts approximately If it is the synthé case is vérouillé and functions correctly. In the contrary case to seek continuation the cause. It is possible that the adjustment of the VCO is to be begun again. It is under the cap armoured near the synthetizer. Pins 2, 3 and 5 correspond to weights 512, 1024 and 4096. Only the pins 20, 22 and 24 of the MC145151 are with the mass. All others with 5 volts. (Or in the air quite simply), and that temporarily. What gives us on the whole. 1 + 2 + 4 + 8 + 16 + 32 + 64 + 128 + 256 + 2048 + 8192 = 10751 Weight * Not = Qrg X-ray 10751 * 0,0125 = 134,3875 therefore 134,3875 + 10,7 = 145.0875 MHz - We will have on the pin n° 1 of the MC145151 the following qrg: 134.3875 / 9 = 14.931944 MHz. - 145.0875 is thus Qrg Simplex Rx/Tx. - Us will be thus on this Qrg to carry out our tests. - the tx that I had in the hands with desired good to function of continuation. Need to improve to the VCO. It is true that we passed from 15 to 14 MHz approximately
Diagrams... Correspondence PALs supports and MC145151.......... Adjustable R55 is the adjustment of entry BF micro R56 is the excursion..... This if you would require to carry out adjustments if you do not have the microphone of origin. The diagram of the Amplifier.
Points of adjustment on the amplifier
Side emission... Some values and reference mark: (Raised in Emission) Entry - In J03 which is the entry of the Amplifier... vous must find with the frequency meter 14.50875 MHz - the tension is in this place of 700 mV. Modulator - a tension active of 0.95v with 1.05v must be present on point TP01. Modulating amplifier - a value of 9.5v must be read at point TP04 and the adjustment is carried out by L03. Multiplier by 5 and Amplifier - After adjustment of the CV 38, 40, 47, 51 and 52 the frequency at point TP06 must be: 72.54375 MHz. Multiplier by 2 - Qrg of 145.0875 MHz must be read on points TP102 or TP103 after adjustments of the CV 54, 102, 104, 110, 112, 115. Driver - Adjustment of C116 and C124. Final amplifier - Adjustment of C126, C135 and C136. Do not forget to place a load 50 ohms of approximately 20w on the BNC of the TX. The adjustments çi-top were carried out with the following material: - a multimeter - a frequency meter - a volmeter HF (described in my pages) - a Wattmeter - a dummy load (described in my pages) - a wavemeter with absorption.
Catches... If you recovered during the acquisition of the tx, all the elements, namely, the micro HP, the cords of food, and cable it back catch, as well as the diagram of the station...... no problême for vous.Vous have all the information and documents to start In the contrary case you will need certain information to know: - the wiring of the micro catch. - That of the back catch. - and the infos of wiring enters the printed circuit and the frontage. Wiring of the micro catch. The wiring of your microphone will be as follows (If that-çi were not delivered with the tx)..Entrée Pin 1... BF. Stitch 2.....Masse Broche 3.....ptt Broche 6.....+8v It is possible to use pin 7 for entry BF... mais you will have to be in posséssion of a préamplifié microphone. Make atention very not make a short-circuit for there is +8v on the pin n°6 microphonous catch. Best is to remove the wire coming in frontage. Pins 4 and 8 are the exit of the High speaker.Sight of the catch in frontage:
Wiring of the back catch.
Diagram taken towards façade.(Inters... voyants)..
Utilities... To download some tools which will help you:tmf220/util-tmf.zip Table of correspondence for MC145151, MN205, MN206 and weight
Thank you with... Thanks with WHO which placed at my disposal the diagrams, of the infos, and the result of their research.
In particular in Claude F1HRF. Herve F1upl Jean F5pcx Jean F6eka Pierre F1alk
Conclusions... - This transceiver is relatively easy to modify by all. - It is advised to help itself of the provided diagrams. - you will need a little method. - Take time...... it is often paying. - the modifications require little material for the adjustments. - a relatively weak investment for the passage of this apparatus to the steps of 12.5 Khz, on tape 144 to 146 MHz. And to finish I wish that information that I could place at your disposal enable you to conclude the modifications concerning Radio operator Telephone TMF220 of Thomson.. You will want to excuse quality well is diagrams, and/or photographs. I hope that you will have had also same satisfaction as me, to modify this material.
A number of visitors since May 9 99:
Page carried out the 7/Avril/1999 by F5JTZ
Last update the 22 / 08 / 2000
F1UMW (Qrp) took part in the development
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