Icom 271 471 751 Memoria a rischio – Salviamo le nostre radio

Cari amici vi riportiamo degli interessanti articoli su come salvare e riprogrammare  le vecchie radio ICOM come ad esempio il 271 ed il 751 e comunque tutti quegli apparati che montano come memoria la EX-314.

Questi apparati purtroppo presentano un problema non da poco, ovvero dopo un po di anni la loro batteria tampone interna si scarica ed improvvisamente troviamo la nostra radio senza software e non più utilizzabile.

Per ovviare a questo problema ci sono diverse soluzione, la prima è quella di sostituire regolarmente la batteria tampone.

Di seguito troverete l’articolo completo che usci sul sito ufficiale della ICOM, ed ora non più disponibile (scusate per la traduzione ma è in automatico da google) e altre soluzioni più o meno difficili:

CLICCANDO QUI TROVERETE ANCHE IL PDF CON NUMEROSE MODIFICHE PER I NOSTRI APPARATI ICOM

icom-modification

Nei primi anni 1980 Icom l’America commercializzato un gruppo di ricetrasmettitori e radio che utilizzavano l’ultima tecnologia state-of-the-art computer per migliorare il funzionamento delle radio. Questo miglioramento tecnologia ha permesso prosciutti a permettersi un transceiver ad alte prestazioni a prezzi ragionevoli, che fino ad allora era disponibile solo su unità che costano molto di più. Caratteristiche ora disponibile per i prosciutti inclusi: maggiore stabilità di frequenza, una migliore risoluzione in frequenza, visualizzazione della frequenza digitale richiamo quasi istantanea delle frequenze salvate (canali di memoria), l’elaborazione del segnale in modalità rapida e costruiti in toni e compensazioni per il funzionamento del ripetitore emergente.

L’attuazione di tutte queste caratteristiche richiede una CPU con circuiteria logica associata. Nei primi anni ’80, il modo più efficace per implementare l’elaborazione dei dati e funzioni di memoria era attraverso una DRAM (Dynamic Random Access Memory) per il controllo della CPU. Questa DRAM era un ricordo circuito integrato volatile, che ha richiesto una batteria al litio per conservare il suo set di istruzioni. I seguenti ricevitori e ricetrasmettitori avevano tali unità RAM:

IC-271; IC-471; IC-1271; IC-745; IC-751 / A; IC-R71A

Le batterie al litio in queste unità di solito è durato circa 5 a 7 anni prima era necessaria la sostituzione. Questo è stato specificamente osservato in ciascuno dei manuali Proprietari per i prodotti.

La batteria al litio può essere sostituita dal proprietario radio, se si utilizza cura. La seguente è una procedura consigliata per ottenere questo risultato:

Procedura

1. Scollegare il cavo di alimentazione dalla radio, e togliere il coperchio.
2. Scollegare la scheda RAM e rimuoverlo dalla radio.
3. Temporaneamente saldare una fonte di batteria di CC da 3 Volt attraverso i terminali della batteria esistenti (vedi punti di connessione suggeriti sulle immagini del circuito).
4. Dissaldare la vecchia batteria al litio e sostituirla con una nuova. (BR2325 1HC, numero 945 03112 ICOM magazzino)
5. Dissaldare la tua temporanea 3 fonte Volt DC.
6. Reinstallare la scheda RAM nel radio.

Avvertenze

1. Non utilizzare un alimentazione AC 3 Volt DC fonte, la punta del saldatore a massa potrebbe andare in corto la batteria del terminale (+). Utilizzare una batteria da 3 Volt CC fonte solo (2 pile alcaline, per esempio).
2. Non saldare i fili DC esterni direttamente ai pad scheda batteria al litio. In tal caso, non sarà possibile dissaldare la batteria senza avere i fili drop off.
3. Se per caso si perde l’alimentazione all’unità RAM deve essere inviata a Icom in America per la riprogrammazione.
4. Fare attenzione a non danneggiare o piegare i pin del connettore sul lato della radio durante la rimozione o la reinstallazione della scheda RAM.

Immagini

Ci sono due versioni di schede ICOM RAM. Entrambi sono identici in funzione, e sono intercambiabili. Le differenze sono solo nelle layout del circuito. Si noti che i fili nero e rosso visibili su queste immagini sono il modo suggerito di collegare la tensione di CC del sostegno esterno mentre la batteria è stata sostituita. I fili non sono una parte della scheda RAM, e devono essere rimossi quando la procedura di sostituzione delle batterie. Fare riferimento alla procedura di sostituzione sopra descritta.

RAM immagini versione della scheda A:RAM immagini versione della scheda B:|——————————————————————–| 

Altra soluzione al problema, nel caso in cui sia troppo tardi e la nostra radio non funzioni più è contattare Roberto Nardo IK2RND  che ha realizzato una nuova scheda inserendo il software su una eprom e non su una ram.

http://www2.pv.infn.it/~nardo/main6.html

 

Ultima spiaggia, ma solo per i più volenterosi c’è questa soluzione, ovvero riprogrammare da zero e da soli la propria radio seguendo le istruzioni degli amici di QRZ.ru, questa volta dovrete fare uno sforzo in più considerando che la traduzione è in automatico dal russo all’inglese ma con un po di pazienza è comuqne comprensibile, di seguito trovare i file di memoria in .bin da scaricare e i link diretti al sito. Buon lavoro

 

File di memoria  icom-pgm

Fonte

http://www.qrz.ru/schemes/contribute/technology/ic751.phtml

http://www.qrz.ru/schemes/contribute/technology/icom751/english.shtml

Modification ICOM Ic-751 Sergey satyr’ RW3XA, e-mail: ss@typhoon.mecom.ru Sergey Matveyev UA1OSM, e-mail: ua1osm@mail.sts.ru See also: commentary UA1OSM commentary RV3BB as to a little podrakonit’ controlling programmku of transceiver with the aid of this programmer. To skachat’ article in size Word (10 KB) Part is is 1 preface Ten years ago, in 1991, I obtained my first all-transistor transceiver Icom-751 from one my very good familiar of Germany. Up to this moment I worked as the engineer- electronics specialist and the repairman of the radio systems of more than 15 years and it already had some experience of rotation with transceivers Ic-735 and Ts-440s during my trips to Sweden and Germany. First of all I included transceiver and it delighted in by its work during several it was hour. Everything, it seemed, functioned normally. To me was pleased both half-duplex and work from the pedal in the telegraphic regime, when operator has the capability transferring, to listen to in the pauses of his transfer and here to pass into the usual regime, having simply harvested to the pedal at the necessary moment. Earlier I used the same approach with the construction of the home-made transverter, which worked with R -250M2. Then I was switched to another range. To me was not immediately pleased used by designer sufficiently foolish ergonomics of double action, i.e., pushing of knob, and then the turning of the tuning knob of apparatus for changing the range. However, I properly was worried, when, being located to 14025.0 and changing range, I saw on the scale incomprehensible 21049.4 kHz! Already having an experience with the transceivers, mentioned above, including the apparatuses of approximately the same class – 735 and 745, I was convinced that I must prove to be after the change of range to 21025, 28025 and so on. But mysterious 049.4 as before remained on the scale! I turned off transceiver, waited three minutes, then was again included it. Strange defect was present. Those of the readers, who although once read Murphy’s laws, must know that no one immediately reads instruction, encountering problems. Yes even Murphy’s itself recommends the reading them only when it ceases to work absolutely all. So I honestly continued further completely in accordance with old Murphy’s laws. Observing the strange transition point with the band selection, which by no means could not be explained from the position of the common sense (I he forgot about one – programmers in firm ICOM generally we could ever not be wireless enthusiasts), I solved, that some one of KMOP IS, which are been located inside, it was defective. Before the fact in me was sufficiently “pleasant” long-term practice with Ukrainian KMOP IS of the production of Vinnitsa plant (well this trash, 4 to you I will report!), those with especially subjected to the effect of the fastening, when in IS occurs the local breakdown of KMOP- structures, it begins to consume high current, strongly it nagrevayetsya and it does not function, in full or in part, as it is assumed to it. I opened schematic diagrams, very rapidly revealed small OZU on the pay of processor even it defined, that IS OZU was executed exactly on the KMOP- technology (analog of our KSHCHE”ruyya, which can be here used). Since OZU was energy-dependent, on the shawl was present small 3 v lithium small battery with size coin, preserving contained IS during turning offs of nourishment. 4 he already knew that turning off of nourishment with defective KMOP IS must end the begun effect of fastening and at the same time clean contained IS. Certainly, I was confident, that in OZU must remain only the frequencies of the channels of memory and other current information of processor (stack, register records) – exactly as in those transceivers, with which 4 already dealt. Therefore 4 completely it did not fear, what these data propadut – you will think, will introduce the channels of memory again… I boldly it took out to shawl OZU it unsoldered small battery by several minutes, sufficient, in order to unblock IS, which fell into the nonstandard regime. As unpleasantly I was struck, after seeing disorderly rubbish from the numbers on the scale, when I again included transceiver! Time arrived to read contrary operating instructions. O, what fool I was! What idiots these yaposhki!!! What feature they pushed the control codes of processor in OZU!!! – I was scolded as medical student in M. tven’s short story. Entered wife it was any, UA1OSA, and I shared with it with last news, that 4 recently zaporol our expensive transceiver. It is any it presented to me the unforgettable view and, neither speaking nor word, it left. I set aside the unhappy ICOM to the side and erected in its place old, accurate, and, that the most valuable, absolutely bezOZUshnyy YAESU FTdx505 in order to rather call friends to the aid. Rapidly it answered my desperate khemskiy call Rune, SM0COP. It acquired new to shawl for 50 dollars and simply presented it to me. As reciprocal gift, I sent away to it very first normal Soviet kollbuk – the large heavy book weighing of kilogram or near that. After the years, many our wireless enthusiasts burn into the same Japanese trap, as 4. And they all were forced to spend from 70 to 100 dollars in order to purchase and to obtain to shawl OZU from ICOM directly to their addresses.

Purpose is realized it went time, and 4 began to think about the deadline of service my new by that presented Rune shawls and small batteries. Firm guaranteed only five years, but the periods of refusals can be and less… by that time 4 it already mastered rather well PiSishnye computers and was user during more than decades. Previously we all in THE USSR made computers themselves, as the reader, probably remembers, and my son, and 4 itself they were not exception. In the number of other we repeated famous RK -wku on VM80 processor as early as 1987 and she was about capable with the ease of programming both KMOP OZU and PPZU with THE UV erasure. The computational power of any IBM PC in comparison with 86- RK made it possible to make this with tiny IS OZU of the transceiver simply of igrayuchi. Unfortunately, 4 not he was programmer and did not know neither assembler nor high-level languages of programmings, for example – Si++ or Pascal, which could be used here. After I shared in ether with its considerations with the “king of soldering iron” RU3XS, by Sergey, according to his recommendation I was turned to other to Sergey, RW3XA, who proved to be not only excellent DX operator, but also outstanding programmer and most experienced electronics specialist- experimenter. And to my enthusiasm, it had the electronic addresses of the mail both of the house and on the work. Thus, it became the co-author of this article. The use of the scanner and Internet made it possible to complete the rapid exchange of diagrams and of the ideas between UA1OSM and RW3XA. And here, three months later from that moment, as task it was set, Sergey sent communication to me, that the programmer already functions, and program is written also. Sergey up to that moment not had either transceiver ICOM, or the very shawls OZU, but it had a listing of sewn in OZU manager of program, and also a schematic of the firm programmer YEKH-YA28 of firm ICOM, the very shawls OZU and pays of the processor of transceiver – everything that 4 I could obtain from the different associates ether each in these years. Sergey prepared the mock-up of the programmer, which successfully worked with his 486- m, and, similarly, could work with any IBMko1 – although 1980 of release. After obtaining of glad news and diagram with the program from Sergey, I prepared the suitable to the operation working version of programmer for the already present shawls OZU. However, it also worked well after its first switching on.

Obstacles on the way several words here must be said about firm ICOM, from the point of view of responsibility for their production and its relations with the user. This firm is the best producer of amateurish and many other technology for the long years. And is simultaneously enemy the number of 1 wireless enthusiasts with piarovskikh respect to the type “firm- client”. The policy of firm, approved by its headquarters, is very unfriendly, aggressive- self-reliantly on -samurai pumped, it denies any contacts, opinions, councils and other attempts at the feedback from the client to the firm. It sometimes seems that the firm is not simply interested in an improvement in its production, which refers to wireless enthusiasts. Complete opposition to this policy is the firm policy YAESU and Ten- tech usa. These firms always of druzhestvenny are opened to wireless enthusiast. So that if equipment ICOM would be only worse, 4 never it began not only it to acquire, but also to generally have any relation with this “supplier”. It is understandable that any of the wireless enthusiasts, it goes without saying, never would obtain from the firm the codes of processor, vnutrennoyeye ON, and so on for this domestic experimentation – NIR and OKR, such as we ventured with Sergey, for any of their articles – even it “19 centuries” and with the centenary beard! The European and American branches of firm, however, proved to be friendlier and they granted a certain information. This ob”yasnimo – Europeans almost everywhere there work and Americans – normal people, without the strange conceit of headquarters ICOM, equivalent to conceit Napoleon Bonaparte. Thus, it was possible to obtain the codes OZU for the usual and improved version ON 751 apparatuses. The reader, possibly, will say here that completely superfluously to be turned into the firm, when it is possible simply to rewrite the codes from the yet not devastated pay OZU, and this will be correctly – now, when there is a finished programmer! But since the task of the copying of the codes from one side, and the creation of programmer by pillar – with another, are approximately equivalent on labor expenses, everything becomes in its places – we created article, having as the model almost anything, except our large desire. Several words about the firm programmer YEKH-YA28 of firm herself. This article was created IccOMom for the reprogramming of pays OZU under the conditions of the branches of support 0 0N throughout the world. These are the expensive instrument, prepared on the base of processor 8085, IS PZU, by analogous RF ppzu SHCH”erf2, its own ON, find in this IS, and socket for one additional RF2, from which the program for the copying was taken. I.e., programs are stored in RF ppzu, specific IS for the specific model it is necessary to put into the panel, then to put to shawl OZU in the place for its programming, which is two rows of contact needles, then to include programmer and to produce readout from PPZU in the memory of processor, and then – record in OZU. The indication of the fulfillment of the operations of reading and writing occurs on ZHKI or light-emitting diode signal panel, vmontirovannom into instrument itself. I evaluate the cost of YEKH-YA28 itself, approximately equal cost of the transceiver, with which the discussion deals, so that does not have sense whatever to acquire this device the firm, even if it will agree it to sell. – I is confident moreover, that also would here follow the refusal, in view hostile- oriented policy IccOM’a with respect to the wireless enthusiasts.

Description of mechanics and the purchase articles What does represent programmer outside? This is the small plastic box of two halves, fastened along the angles by four small screws – samorezami. Inside is located the printed-circuit board, prepared on Vol. n. “assembly mole-rat” – to the network of openings with a step of 2.5 mm. of course it is possible to eliminate pay of very. On the pay find two IS and landing needles for shawls OZU. The pay of programmer is pressed between the plastic halves of box. In the upper part of the box is cut out the window for the insert shawls OZU. Two IS of 555 series are used, for the inexperienced amateurs it is possible to recommend with the repetition to use sockets for IS, although this is not compulsory. Besides two TTLSH IS and sockets are necessary two rows of the contact needles, which can be taken from any old and unfit computer map RS, two light-emitting diodes also of resistor, one capacitor even two miniature toggle switches. The scarcest component is the piece of computer cable for printer IBM RS, the so-called cable of parallel port with the joint of the type Of tsentroniks; moreover the presence of last joint is not compulsory. If the reader has available the entire intact cable or it will decide him to purchase, then it is better to purchase the mating part of the joint Of tsentroniks for the installation on the box in order to preserve cable for the daily work with the computer and the printer. If the joint Of tsentroniks is absent, or it is damaged – it it is necessary to iz”yat’ entirely, and then to embroider cable inside the box. Setting the mating part of the joint Of tsentroniks will somewhat increase the dimensions of your box. But it is also necessary to prepare the power unit, which would issue the stabilized voltage of +5 volts (not more than 5.5 and not less than 4.5!!!) with the current not less than 50 mA. The author used the existing power unit of the portable external computer accumulator of Bernoulli – 100 mb. ZIP-dra1va firm IOMEGA, which widespread in RF. Block issues plus of 5 volts with the current to 1 A, which is ideal for this device, those more you not will exploit its each day. For the connection of nourishment is necessary the corresponding joint (as on the transistor radio receiver) or the pair of clamps. Present version works under Windows in window DOS. Programmer is necessary for the following transceivers of firm ICOM, designed with the application OF OZU: Models 740, 745, 751, “shchyA, 2″yA, 2″yN, ya”yA, ya”yN, 1271, 761, receiver R-71. of the diagram of pays OZU have two interchangeable versions. Contained OZU (codes) they befit only for the concrete model of apparatus and they are not interchanged. Part I prepared for the publication on the site S. Matveyev, ua1osm@arh.ru

Part 2 preface it is immediately necessary to note that 4 I am not worshipper ICOM. So already it was formed, that that technology ICOM and KENWOOD, with which for me it was necessary to encounter, did not leave proper impression. As a result this affected also selection HF and VHF transceivers for itself in favor YAESU. On the small nuance with the replacement of small battery in transceiver ICOM 4 already somehow it heard, but perceived this simply as the concrete result of careless handling with “thin” Japanese electronics. There was how my surprise, when to me turned himself Sergey UA1OSM and he described about its problem with Ic-751. On that which occurs, such occurs not too and it is rare, and it is far from in one model of transceivers ICOM. And, that most important, possibly entirely not through the fault of user, but through the fault of developers ICOM. I.e. through several years of operation small battery is discharged and data in RAM disappear, but without these data transceiver will not earn even with the new small battery… Certainly, you can object, which when these transceivers were developed, yet not there were such concepts as FLASH, EEPROM and the like. but, since as a result of the discharge of lithium battery (even through several years) transceiver becomes absolutely inefficient, then producer was obligated to think about his clients and to provide something in order to exclude this situation. Simplest to place the second holder for the battery and in the operating instructions the need for the installation of new battery (and only after this removal of old), for example, every 4 years… At least so would be honest and, most importantly, it is more reliable. On the whole – puncture. But possibly, this was the simply long-term concern about its service centers. Yes, technologies are improved also in the contemporary transceivers of this problem no longer there exists, but on how much already years old Japanese transceivers work, and still they will be able! If by them a little soak. That do not say, but nevertheless fine people the Japanese, they know how to make electronics and transceivers in particular. Thus, in the process of considering the problem with UA1OSM we came to the conclusion that it is good to make a programmer for Ram-unit module. Good by this time Sergey already somehow procured the selection of piercings RAM for several models of transceivers ICOM. I.e. it was that write and it was necessary still than, i.e., it was necessary to make an electronic part of the programmer and to write controlling program for it. Here I astonished second time, occurs UA1OSM it has already sufficiently long ago discussed this problem in ether and in this time to it not who it fell (or at least it did not respond) from those, who could solve it. Apparently, to Sergey simply it did not transport, or it there did not search for. 4, for example, amateur CW and DX, and almost always in ether (if it is free from the work, the children and the wife), although me and not frequently audibly: -) . On the whole, the idea with the programmer me interested, and, first of all in the fact that as a result must come out a device sufficient simple in the repetition, with the aid of which it is possible “to revive” or to prolong life some IccOM- OV. On the whole, it was necessary to be decided and to find several days that to tightly study the embodiment of idea into the life. In principle, this programmer (Ex-428) has long ago existed, but, as it is described above, price makes with its inaccessible. Especially as programmer is necessary one time in several years. By the way, this article is written precisely for those, to whom it is interesting not only “to drive” on the transceiver, but still also “to propolaskat’ the brains” this transceiver. Otherwise, ~y00$ for the new RAM module plus several months of expectation there are no problems…

Diagram For programming of the module it is necessary of 4 bidirectional and 12 output signals; therefore the most rational solution was the use of a parallel (LPT) port of computer. Moreover with the development was considered the possibility of the works on any computer, including XT and 286, in which were used unidirectional LPT ports. Programmer is executed on two microcircuits, the first (KYSHCHEEIRИ or 7ВLS374) is used for the catch of address, the second (KYSHCHEEAPYA or 7ВLS241) for multiplexing of the direction of data bus with zapisi/chtenii. For the nourishment of microcircuits is necessary any power unit with the output stabilized voltage of +shchV and the current 50-100 mA. For example two batteries on ya.shchV (for the hour of work it will be sufficient, but more and not must) + stabilizer 78L05 or power unit from the modem + 78L05.

Schematic diagram

Switch “Lock-Pgm” is intended for the apparatus blocking of module from the random record with its installation or extraction from the programmer and respectively for the start of module to the period of work with the program. By other words to transfer switch into the position “PGM” is necessary only after the starting of program and with the already established module. But before the output from the program or before the extraction of module switch must be set to the position “LOCK”. The fact is that the necessary state of the lines of port LPT is established only on the period of the work of program, all the remaining time by these lines govern BASIC INPUT-OUTPUT SYSTEM, the system or other programs, which a concept do not have about the programmer for RAM modules. But to what this can lead you and themselves you surmise… Program Program for programming RAM of modules (icom_.pgm.exe) is written for DOS, i.e., for the programming will approach even XT, but, nevertheless, it excellently works under Windows and is used direct access to registers LPT of port, passing system drivers. After starting reveals the prompt, that it is possible to unblock module (regime “PGM”), if it is already established. In the program are realized only two functions – reading (Read RAM) and records with the checking (Write/Verify RAM). With the pressure of key “R” (reading) inquires the name of the file, in which there will be preserved current contents of the memory of module. After the introduction of the name of file reading and retention of data into the file begins. If the name of file is not assigned, then contents of memory only will reflect on the screen. On the key “W” inquires the name of the initial file, the contained which it will be recorded into the memory of module. To program icom_.pgm.exe are applied the files with the data for the modules of several types of transceivers. If you do not have anything better, then try them. But if you want to reprogram the module of working transceiver by new piercing, then it is better to first read contents of module and to preserve him into the file, then you always be able to return module into the initial state! Try to store such files in the special catalog in order to exclude the loss of file with reading with the retention into the file. In the regime of record checks for itself reading for each byte. If the recorded byte does not coincide with schitannym, then reveals communication about the error with the indication of the address of the written and schitannogo byte. On leaving from the program reveals the communication, that it is necessary to block module, for this it is necessary switch to transfer into the position “LOCK”. To take out module from the programmer is possible only in the position “LOCK”, also, after turning off of the nourishment of programmer. Conclusion With the development of the apparatus and program part of the programmer i not had real Ram-unit module. For the fixing it was necessary to make its analog on KRSHCHE”ruy0 (KRSHCHE”ruyya it did not be located), since with respect to characteristics they practically identical and are characterized by only organization. UA1OSM repeated diagram, tested with the present module and… (here I it astonished third time)… everything immediately earned, including transceiver Ic-751! I hope, in you also everything will come out. The archive of all is file for the programmer – icom-pgm.zip (52kb) Sergey satyr’, RW3XA.

The commentaries of Sergey UA1OSM recommendations regarding the alteration are such: Move away to shawl OZU from the turned-off apparatus. Find custom-made BIS ISYYA (M50780SP) on the pay of processor. Find conclusions 17 and 18. Conclusion 17 must be carefully bitten off or to unsolder from the printed-circuit board (do not forget to be grounded!) and certain before this to open completely apparatus from the network, after grounding housing. After cutting in parallel to the made by you break to solder diode 1N914 or similar small diode, type KDSHCH22, for example, by the anode to IS, by cathode to the remaining diagram. Conclusion 18 ISYYA is not connected anywhere. It must be analogous with conclusion 17 connected by diode with the same point. Namely – the anode of the second diode KDSHCH22 you solder to the conclusion 18 IS, and cathode diode- to the cathode of the first diode, i.e., connect them together. Then you put to shawl OZU in the place and you check apparatus. If it works unimportantly, then it is necessary to tune FAPCH. It is necessary to tune Sy0″via the connection of the high-resistance open entrance of oscillograph to resistor R46 on the pay FAPCH. To establish the frequency of 29999 kHz and to tune Sy0″before obtaining of the value of 6,5 volts. To verify at the frequency of 22 MHz must be approximately 1 volt, at the frequency of 35 MHz – about 7 volts. Problem in the fact that the frequency-dependent chains can be not designed for the work to 50 MHz! In my Ic-271h FAPCH generally is reconstructed from 100 to 200 MHz, but RCH of the outline… of.uvy! About the scale and the excess discharge. Judging according to diagram 751, it has to planned identify two discharges after comma, but then narrow-eyed this of sochli by inadvisable. In the repair book Ic-751 on page 4-16 in the diagram is drawn scale 751, where after comma is identified not one, but two discharges. For the dynamic indication of frequency it answers ISY uPD549C, for the dynamic indication of data of detuning -IS2 of the same type. Both are there and there soldered all sign-places of indicator, including – and not utilized. To the entrances 2-5 ISY will be given the programming code TSPE, which controls through its internal trigger- catch with introduction and accumulation into the internal storage of the data about the frequency, which enter entrance 15 ctl. Simultaneously the entrance 25 IS reset pulses enter. By grounding entrance 1 constantly solved the record of the manager of the program code into the the internal trigger- catch. The illumination of segments is removed from conclusions 16-22, the illumination of sign-places – from the conclusions 6-12 IS. Clock frequency is determined by the capacity S2 or S’, switch oned between conclusions 27 and 28. Upward

Commentaries RV3BB in me ic-751 were the same problems with RAM as in you. 4 when that it attempted to reach piercing for RAM, even it were turned to firm ICOM through the sevisnyy center SEYKOM, which is located in our Moscow, but they even to center did not give. It was necessary to send away RAM in USA. Managed to me this into the kopeck. But recently it came across to your page in the Internet. The thanks to you RW3XA – the good matter made. It prepared programmer- works excellently. In me was second defective RAM -4 it replaced mPD444C by SHCHE”ruye it played a little itself with RAM. So here. When I sewed RAM by your piercing, then my ICOM began to work with nebol’shchimi Glucks (with VKL of detuning RIT/XIT) and even in regime GENE it began to work do32mgs- in all regimes both on the method and on the transfer and after e2mgs to shch0mgs in AM and Fm- but without the the input konturov(poetomu there was the silence higher than e2mgs). When I sewed ram752.bin- the same. After being convinced of the outstanding work of programmer I it were decided to count piercing with its WORKER RAM which to me they sent from USA. When I rewrote its EXPERIMENTAL RAM of new prowivko1(.ram751- 1) – everything arose in its places – and not more to e0mgs, and not Glucks’s what. My ICOM IC751 with factory serial number 01293. All this 4 to the fact that in them are many piercings. And not in vain they before sewing my RAM inquired by factory serial number. Therefore I send proshchivku by the name (ram751-1) it is possible to place of it on site- can to whom it will prove useful. I here heard that into Ic-751 was established transverter on yyayamgs. in this case the scale it showed this 144.000,0 discharge is to the left in me free and it living. When barakhlila RAM it not only shone, but also money-changers its value when I turned this valkoder.Khotya 1 not necessary to change if we work on 144. Upward

As to a little podrakonit’ controlling programmku of transceiver with the aid of this programmer. Thus, if we place the piercing, made for 271 VHF apparatus, in 751 KV apparatus, in the first place, nothing poor it will occur. In contrast to Ft-920, where by the usual programming it is possible to produce many unpleasant matters and to ruin transceiver for a long time. Transceiver begins to be tuned to the transfer, as I understood, in the range 100-200 MHz, and to the method it works on 28 MHz. I do not know, so whether this, or it is simple illusion on the signal panel, since given BY FAPCH it is obvious others! It still can work on 28, this is understandable, well and in the relation 100-200 MHz I assume that this is simply phantom conclusion to the indication… If synthesizer in reality issues 200 MHz- this healthily, then we solder shawls OZU one to another and we switch by their way of selection necessary IS OZU. Now, accordingly telex from headquarters ICOM, sent 27 April of 1984 by export manager T. okhmoto to all distrib’yutoram of this firm, programming frequency range FAPCH is achieved as follows:

Lower limit in the frequency:

002D – 10 Hz
002E-100 Hz
002F-1 kHz
0030-10 kHz
0031-100 kHz
0032-1 MHz
0033-10 MHz
0034-100 MHz
0035-1000 MHz

The upper limit in the frequency

Consequently, addresses 002d-0035 determine the minimum frequency of reconstruction, and addresses to 00e’-.00Ee – its maximum frequency. For example, if you should program reconstruction from 140 to 150 MHz on this apparatus 271, it is necessary to introduce the values

0034-F1
0033-F4

further with the remained addresses F0 This we introduced 140000 kHz.

003D-F1
003C-F5

further with the remained addresses F0 this we introduced 150000 kHz F it is introduced for adding the half-byte of data to the complete byte. ——————————————————————————– Accordingly, it is possible to try that? In KV the apparatus:

003D F0
003C F5
003B F0

and further zero this is upper boundary of -50 MHz.

002D-F1

with 10 Hz and further F0. this lower boundary -10 Hz. now after sewing the synthesizer KV of apparatus must work from 10 Hz to 50 MHz, the remaining matter of the GTP- main circuit of method. But the highest discharge will remain nonworking. Now let us displace physically the conclusions of the illumination of discharges to one so that that information, that it were given to the next-to-last discharge, would begin to be given to the last (high-order) digit of indicator. I.e. – elementarily let us resolder them. The least significant digit will be freed – it we will lead for indication ten hertz. Actually we must wire from the conclusion of и-.”G of indicator transfer to 2″-.’G, after all of their sequential resoldering will be freed conclusion 12G. Then wire, that previously sealed from 27 elder conclusions we transfer to the lowest-order conclusion 5, which corresponds to discharge 12G. from elder conclusion 6 (T0) IMS of counter we also unsolder the same wire and is transferred it to the lowest-order conclusion 13 (T7) IMS. I advise from the last procedure and to begin, i.e. – to, first of all, free the lowest-order conclusion and to resolder to it and to the free conclusion T”OF IMS both ends of the elder itself. If with the engaging of the apparatus on this sign-place begin madly to change ten hertz during the rotation knob- means, experiment succeeded… and it is possible to resolder remaining conclusions! Upward

Description of the very diagram and software will be done below by Serge Satyr, RW3XA.

Piercings for the microcircuits:

icom761.bin

ram271.bin

ram272.bin

ram751.bin

ram751-1.bin (piercing RV3BB for IC750)

ram752.bin