Opening and closing Yeasu FT-51. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Opening and closing Yeasu FT-51. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Civil radio communications

Comments on the article

What will it give?

In my case, the station opened for reception and transmission in the range of 60-999 MHz. In reality, there is no such overlap.

Where did it come from

Sourced from USENET. Everyone knows, but not everyone has tried. The reasons for this are different: fear of getting into a $500 machine, lack of knowledge of the English language.

How to make

We save all data from memory using a programmer or piece of paper. We remove the battery, unscrew 6 screws from the L-shaped cover covering the keyboard at the back and one screw from the button holding the battery.

We find jumpers. These are contact pads, filled with solder or not.

To make it easier to reach the jumpers, you can pull the ribbon cable out of the connector. We remove the solder from JP1007, this will open the station to work in the range of 134-174 and 420-470 MHz. We can stop here.

We collect the station.

Press [MHz A] and [MHz B] at the same time, turn on the power. We turn the encoder and enjoy. If you repeat the power-on procedure with the [MHz A] and [MHz B] buttons, the station will switch to the 144-146(148) and 430-440(450) MHz modes. One drawback - this procedure clears the memory and all settings.

If you decide to radically turn around, read on. We remove the solder from JP1004, this will make it possible to edit the program menu. We are assembling the station. While holding both Vol/SQL buttons and the [CALL] button, turn on the power and enter the program menu mode. The functions are selected by the shaft encoder. Adjustment: hold the [F] button until the F icon flashes, use the [MHz A] and [MHz B] buttons to change the value, the [F] button writes the value. Exit the mode - turn off the power.

BAND
1
Range
IF NO
0
Do not know
S-FULL
84
Full S-meter
series
19
Start of S-meter
SQL TH
64
Noise suppressor, upper limit?
SQL TI
4E
Noise suppressor, lower limit?
MOD L
25
Modulation level (compression, low level)
MOD H
27
Modulation level (compression, high level)

Each band (left/right receiver) has different settings, so choose the right one first. hex numbers. All settings are similar to FT-11. Can someone please tell me how to adjust the squelch thresholds!!!!! At my station, one of the thresholds is down (SQL TH) and the station has become defective. Kind people!!! Help!!

After changing the BAND (from 0 to 7), press the [CALL] button, the station will turn off the power. Press [MHz A] and [MHz B] at the same time, turn on the power. The station, depending on the band number and processor firmware, can switch to different modes: European (144-146, 430-440, Tone burst), Japanese (144-148, 430-450, SQL open), open (134-174, 420-470), very open (60-180, 300-512, 700-999) and very open (60-999). In my case, there were: European, Japanese, and solid. Naturally, the sensitivity and output power are not the same everywhere, here are the real limits in my device: 121-179, 319-488, 650-950, + 100 MHz aircraft band (AM, receive only).

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

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