I've found a schematic and photos of what seem to be a construction manual for this thing on a bulgarian HAM radio webside, but UA-cam doesn't keep my comments if I post any links. 😡 It seems to generate it's carrier with a colpitts 1MHz quartz oscillator that's feeding into one of the integrated circuits (the Tesla integrated circuits are flip flops and logic gates). That's alos where the switches for the frequency selection go to, so it's safe to assume they IC's generate, or have something to do with, the carrier frequency. By the looks of it there are some bulgarian made silicon transistors, I've noticed BT6551 (2T6551) on two places. Couldn't read many of the smaller metal can ones, but I know for sure Bulgaria used to make a whole series of different transistors from those TO-92 and similar, including the grey ones.
I really liked your review of a rare radio station. Bulgarian production. Some details from the Soviet past, the rest I recognize as Bulgaria. It was very interesting. Thank you!
Removing the from panel will allow for more access to repair the board in the jack. Interesting way that was designed with so few interconnections between the modules.
Impressive all the hard work electronic engineers had to do to overcome the limited technologies of the time. These days that radio would probably all fit on a postage stamp sized pcb with a tiny bga chip and a pcb inductor coil. Modern tech is really boring.
0:09 офигенная у бУлгар МТТ-УК-1, 17:25 там еще нет MAX4062EUB.... Автор - хочу обзор на нее, у украинцев много таких в трофее "(сикрет мульти(5)лэйерсПутынСбоардс)" =- так и чую такие слова в рассказе:3
can anyone advise what the red thread marker/lock is on the screws i see on military electronics such as this, you can see it around 41:13 on the flat head screws... It always seems to be the same colour and quality.
Traditionally it would be "Sealing Wax". Basically beeswax with colouring material. More recently, various propriety materials are used to lock the screw against vibration, but still allow it to be removed. Do a search on "thread locking compound".
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I've found a schematic and photos of what seem to be a construction manual for this thing on a bulgarian HAM radio webside, but UA-cam doesn't keep my comments if I post any links. 😡
It seems to generate it's carrier with a colpitts 1MHz quartz oscillator that's feeding into one of the integrated circuits (the Tesla integrated circuits are flip flops and logic gates). That's alos where the switches for the frequency selection go to, so it's safe to assume they IC's generate, or have something to do with, the carrier frequency. By the looks of it there are some bulgarian made silicon transistors, I've noticed BT6551 (2T6551) on two places. Couldn't read many of the smaller metal can ones, but I know for sure Bulgaria used to make a whole series of different transistors from those TO-92 and similar, including the grey ones.
اعشق الاجهزة الألكترونية القديمة . بالتوفيق
I really liked your review of a rare radio station. Bulgarian production. Some details from the Soviet past, the rest I recognize as Bulgaria. It was very interesting. Thank you!
Removing the from panel will allow for more access to repair the board in the jack. Interesting way that was designed with so few interconnections between the modules.
Impressive all the hard work electronic engineers had to do to overcome the limited technologies of the time. These days that radio would probably all fit on a postage stamp sized pcb with a tiny bga chip and a pcb inductor coil. Modern tech is really boring.
Nicley made, wery good housing and mechanical concept.
ICs haw a dual purpose i presume, carier generatio and perhaps some kind of basic encription.
Excellent video. It is probably best if you avoid any walkie-talkie radios from the Middle Eastern countries for a few years......
Nice!
Microphone is most probably ДЭМШ-1а. Very common in soviet designs for noisy environment.
наверно тульская "Октава" досихпор их делает (или ТДМ-3-Э)..:3
Как же долго ты ковыряешься,терпения уже нет.
0:09 офигенная у бУлгар МТТ-УК-1, 17:25 там еще нет MAX4062EUB.... Автор - хочу обзор на нее, у украинцев много таких в трофее "(сикрет мульти(5)лэйерсПутынСбоардс)" =- так и чую такие слова в рассказе:3
5:45 wouldn`t a lens opener - which you probably have as a photographer and tinkerer - be able to open this?
can anyone advise what the red thread marker/lock is on the screws i see on military electronics such as this, you can see it around 41:13 on the flat head screws... It always seems to be the same colour and quality.
It appears to be similar to a product called "torque seal"
Traditionally it would be "Sealing Wax". Basically beeswax with colouring material.
More recently, various propriety materials are used to lock the screw against vibration, but still allow it to be removed.
Do a search on "thread locking compound".