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Modification of Alinco DJ-191. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Civil radio communications

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I purchased Alinco DJ-191T, I wanted to register it. But it operates in the range from 130 MHz to 174 MHz, both for reception and transmission. Gossvyaznadzor will misunderstand this. It is required to drive the station into the range of 144-146 MHz. How to do it? In general, this device (like almost all bourgeois ones) operates in two modes: closed and open. For most stations, this is done by poking a jumper, removing a wire or piece (usually a diode). My Alinco does this with a programmer. I assembled the ERW-4 cable, launched the program, set the parameters and wired up the station. The scheme and the program can be taken on the “site of the Kuban radio amateurs”. The closed station began to work from 144 MHz, but up to 148 MHz. Won't go. Wrong letter at the end. For use by radio amateurs in Russia, only stations of this type with the letter “E” at the end are suitable. What to do?

In general, for decent devices, the model changes with the presence / absence of a jumper, diode, resistor. After all, the bourgeois will not develop a different processor, a printed circuit board for each model. Alinco DJ-191 is no exception. We look at the diagram, in its corner there is a small plate:

  R79 R84 R1008 J1
T - - - jumper
TA - - - -
E 1k 1k 0 -

So, to translate “T” into “E”, you need to solder 3 resistors and remove the wire.

Let's look at the diagram.

 Alinco DJ-191 modification
(click to enlarge)

We found these resistors. We disconnect the battery, antenna, turn out 4 bolts from the back cover. I hope you know what you're doing, it could void your warranty on the station and put it out of action by your inept actions. The most zapadlo that the details on the board are not signed. We look where the track from the 14th output of the processor goes. It goes into a cluster of resistors located under IC1 (EEPROM), one of them is not soldered and one mounting pad is called to ground. This is R84. Tracing 9 of the processor output does not give anything, the track goes under the processor. We are looking for J1, it is signed and located between the processor and the F-PTT-TB-Moni buttons. To the left below it is a group of resistors and there are two empty spaces. These are R79 (one platform is called to ground) and R1008 (it is called in parallel with J1). Resistors can be found in another way. We are looking for empty mounting sites (there are 6 of them), we select those in which one site calls to the ground, these are R79 and R84 (there is also R77). Then we call the second platform on the processor output: 14 for R84 and 9 for R79. We are also looking for R1008, put an ohmmeter on the 9th output of the processor and look for an empty area, the second area should call to ground through R60 at 47 kilo-ohms.

We solder two resistors of 1 kiloohm, they say “102”. R1008 is a jumper (resistance 0 ohm, inscription “0”) and is connected in parallel with J1, so we will not solder it. It is a very laborious operation to solder resistors for surface mounting. You put it on the pads, previously lubricated with rosin flux, it sticks. But the resistor must be held (best with a long nail on the index finger of the left hand), otherwise it will move during soldering. I solder with an ordinary 25-watt soldering iron, the very tip of the tip.

Everything, we assemble the station and turn on the power. There is no need to do a general reset of the station. You can go to Gossvyaznadzor.

Transparent hint: the processor still has conclusions signed by BP. And then there is Alinco DJ-491, which operates in the 430 MHz band, and, as I think, they have the same processor boards. But it’s not worth experimenting, the synthesizer will not be able to overtake the VCO and there will be no PLL synchronization, and if you press PTT, then the consequences are not predictable.

Author: Sergey Gimaev, RW9UAO; Publication: N. Bolshakov, rf.atnn.ru

See other articles Section Civil radio communications.

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