(also named ATR221)
You will find çi-after some information which will enableyou to modify with less expenses Radio operator Telephone VHF pro TMF220 of Thomson to pass it Emission/Réception in the Amateur band from144 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 the150 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 tomodifiable 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 equippedwith it, the wheels coders of the selective calling or then of themasks. Below 2 cursors. The first for blocking of Horn, and thesecond for Squelch. Then the Marche/Arrêt button, and Bf volume.Then the switch of channels (16). And in the last the microphonouscatch (with exit HP).Back of the apparatus...
Of left on the right: A catch of exit for variousaccéssoires. 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 andtelecommunications authorities. - Pin 21 of the MC145151 - Pin 6 ofthe MN206- the synthetizer. - How walk you it?? - In the sharp one of thesubject- 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 ofthe 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 thatyou 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. Wewill have to thus remove it, and to carry out the maid connected afterthe 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 befree. - Then a small connector with 2 wire, which is J07... it is theconnection of the High speaker towards the Micro catch. You canwithdraw 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 beextracted. It is that which is on the right beside the supports ofGREEN color. It is the order of the 2 integrated circuits STAKESwhich were used in PRO.It is possible to preserve this connector industry if you use theswitch with 16 channels to control the synthetizer by an one-waycircuit. 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 theMC145151.
Under this turntable you will find that of CALL SELECTIF.- a connector with 5 wire is practically located at the vertical ofthe MC145151. - a second connector is visible almost opposite themicro 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 selectivesystem. - J07........est the exit High Speaker towards the microcatch. - J206...... is the ordering of the 2 STAKES for Mc145151.The length of the cable was planned for that. When thisoperation is made you thus gave in service: - the Emission part - theBf reception - postal and telecommunications authorities.
Order postal and telecommunications authorities... Pin 21 of circuit MC145151 corresponds to the shift ofEmission/Réception..Information postal and telecommunications authorities isdispo on supports MN205 and MN206 in leg 14. It passes to state 0 inreception and state 1 in emissionAnother place for the postal and telecommunications authorities is onthe circuit of the Amplifier.ATTENTION:En X-ray there is 12v on this pin, and it passes to 0V inEmission. It will imperatively be necessary to use a diode in yourcontrol circuit to avoid a return. The synthetizer... The TMF 220 is controlled by a synthetizer whose circuit is well-knownof all the MC45151 from Motorola. It is him the heart of the machine.With the origin the frequencies are given by 2 named integratedcircuits STAKE, whichwere (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 toarrive on pin 27 of the MC 145151 to 100 Khz. (On the side stabilitythe pros do not joke- the step of synthé. It interests us and of near. A glance aroundthe 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 8Frequency Dividing Oscillator / = NotSmall calculation...... 100 / 8 = 12,5 Khz. (100 Khz is the frequencyclock injected into the circuit with pin 27). Perfect, there will notbe to modify this part as well as the dividers, nor to change quartz.- the shift Emission / Réception is made by 2 integrated circuitsSTAKE. This is why pin 21 of the MC145151 which gives the shift of10,7 MHz between the Emission and the reception is not used in versionPRO. It will be given in service in Amateur version- Synthé recovers on its pin n° 1 the frequency of the VCO. That-çifunctions in low frequency, and comes then chains multiplying by 5then by 2 for the Emission. In the current case there is Qrg of15.53375 MHz on the leg n° 1 of the 145151.....Therefore you will have at the final exit this frequency multiplied by10 is 155.3375 MHz. (the frequency of entry on leg 1 of the MC145151is identical to Qrg of the VCO) There is no circuit pre-divider as onsome other Tx.In the sharp one of the Subject... - To extract the 2 integrated circuits STAKE (reference MN205 andMN206) (It east can be already done) - nothing to put at the place ofcircuit MN205. (It is that which is readiest of the MC145151.)- For a support with 16 pins which it is necessary to put at the placeof MN206, it will be necessary to make following wiring: - To jointogether pins 2, 3 and 5 on mass 8. - pin 6 on the leg 14 of thissame support. - pin 21 of the MC145151 on leg 5 of the MN201. - pin21 of the MC145151 towards leg 3 of J04 or on the chart amplifierthrough diode 1N4148 or other.Seen on the support which has the straps. This makes it possible tobe on Qrg Emission / Réception of 145.087.5 MHz.- a rapid controls on pin 28 of the 145151 makes it possible to seewhether there is always the tension of 8 volts approximately If it isthe synthé case is vérouillé and functions correctly. In thecontrary 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 thepins 20, 22 and 24 of the MC145151 are with the mass. All others with5 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 = 10751Weight * Not = Qrg X-ray10751 * 0,0125 = 134,3875therefore 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 Ihad in the hands with desired good to function of continuation. Needto improve to the VCO. It is true that we passed from 15 to 14 MHzapproximately Diagrams... Correspondence PALs supports and MC145151.......... Adjustable R55 is the adjustment of entry BF micro R56is the excursion..... This if you would require to carry outadjustments if you do not have the microphone of origin. Thediagram of the Amplifier.
Points of adjustment on theamplifier
Side emission... Some values and reference mark: (Raised in Emission) Entry -In J03 which is the entry of the Amplifier... vous must find with thefrequency 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 onpoint TP01.Modulating amplifier - a value of 9.5v must be read at point TP04 andthe 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 orTP103 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 BNCof the TX. The adjustments çi-top were carried out with thefollowing material: - a multimeter - a frequency meter - a volmeterHF (described in my pages) - a Wattmeter - a dummy load (described inmy 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, aswell as the diagram of the station...... no problême for vous.Voushave all the information and documents to start In the contrary caseyou will need certain information to know:- the wiring of the micro catch. - That of the back catch. - and theinfos 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 notdelivered with the tx)..Entrée Pin 1... BF. Stitch 2.....MasseBroche 3.....ptt Broche 6.....+8vIt is possible to use pin 7 for entry BF... mais you will have to bein posséssion of a préamplifié microphone.Make atention very not make a short-circuit for there is +8v on thepin n°6 microphonous catch. Best is to remove the wire coming infrontage.Pins 4 and 8 are the exit of the High speaker.Sight of thecatch in frontage:
Wiring of the back catch.
Diagram taken towardsfaçade.(Inters... voyants)..
Utilities... To download some tools which will help you:tmf220/util-tmf.zipTable of correspondence forMC145151, MN205, MN206 and weightThank you with... Thanks with WHO which placed at my disposal the diagrams, of theinfos, and the result of their research.
In particular inClaude F1HRF. Herve F1upl JeanF5pcx Jean F6eka Pierre F1alkConclusions... - This transceiver is relatively easy to modify by all. - It isadvised to help itself of the provided diagrams. - you will need alittle method. - Take time...... it is often paying. - themodifications require little material for the adjustments. - arelatively weak investment for the passage of this apparatus to thesteps of 12.5 Khz, on tape 144 to 146 MHz.And to finishI wish that information that I could place at your disposal enable youto conclude the modifications concerning Radio operator TelephoneTMF220 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 modifythis material.
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Page carried out the 7/Avril/1999 by F5JTZ
Last update the 22 / 08 / 2000
F1UMW (Qrp) took part in the developmentReturn to the page of presentation
