Unlock 40 AM Channels on CB-Radio DNT START 1 AM/FM: Modulation & Reception Issues

Hello, I would like to unblock the broadcast on 40 AM channels of the above mentioned radio.
The description given in this post https://www.elektroda.pl/rtvforum/topic862981.html#4422387 unfortunately does not work, yes, the radio broadcasts on 40 channels, but modulation and reception after unplugging the purple wire are illegible, the radio is already tuned in to zero .

I am asking for suggestions, greetings

Caps loock in the title. / Olek II /


According to the will of the moderator, I am correcting the subject

Before the surgery a healthy patient?

Nadawało / odbierało after "German" 4W FM -40CH, 1W AM 4-15CH (broadcasting) 40CH (pickup) mod. loud, clear, listening around ok.

Did you think what the cut cable was doing?

There is the synthesis of c5121, so there must be a separate plate connected between the display, am / fm sw and some place on the radio, in which it blocks the transmitter. There are no schemes on it, write what you have done, or upload a photo of the channel guard

There is a plate inserted next to the synthesis, in addition to the whole album, and the SQ knob which has an AM / FM switch, there is a transistor and resistor on it. < br />

albrecht wrote:

the plate I place photo

This blockade is known in CB Link is is to minimize the n-argument boolean function with one input conjunction using 2k-bit memory prom data out 4 bit. You download her datasheet and you know what to measure and disconnect.
There are two ways to turn it off: simple, and the other one even simpler

Added after 14 [minutes]: < br />

1. As you get lost, the 13th leg is the -CE input, which turns data on / off and I suspect that AM B + is connected there
2. You of a given leg 9 ... 12 and what is the value of hex on the unlocked cell in the cell. It reads from the oldest bin O4 to O1 when -CE = 0. I suspect that it is clean there (it means 0x00). The outputs are of the open collector type and probably locked k. Has the value 0x01 or 0xFF and it is enough to make the jumper 12 of the leg to GND. But it depends on what is encoded in memory and you have to measure it

I sought out the layout and did not find it, probably not much I would pass. I will check the patent with 12 naked for mass and write about the results.

See if R88 leads from Vcc to one of the outputs that disables Tx. Here's a memory note of philips Link

I have stuck 13 and 11 leg by stretches, and by looking from the top of the system, ie "from the notch" to the left, 4 and 6 counting from the top. The radio works on 40 CH in AM. Thank you for your help. Is it possible to gently raise the power in AM on this radio? In some of the exams without a hit mod. idzie wycisnąć coś ok 2W /

If it is only about increasing the power for the power itself, then in the real range such a mouse will not change much, and it may be worse.

Regarding the blockade, it's a pity that you do not catch the hints and now you have turned the subject a bit, because you have closed the entrance with the exit and it is not too cool Consider the option of cutting the pull-up resistor at the output, cut the path, replace -CE with constant voltage ... I do not know, brother, I do not have a radio here, I will not tell you. Measure and think that it would be done well.

The radio is already so 24h without a break and nothing bad happens, I prefer to leave it and not tempt fate.