SEM-25: Schematics

The diagrams on this page were scanned at 150 pixels per inch, and you will probably need to use an external graphics-editing program to print them (simply clicking your browser's "Print" button probably won't work well).

The diagrams were all scanned from photocopied manuals, and the originals are just as blurry as the scans, so don't bother asking for photocopies of the schematics! :-)


Block Diagrams

Description File Size
Transceiver blk01.gif 1100x1338, 33k
Frequency selection blk02.gif 1100x1540, 44k
Receiver blk03.gif 1172x946, 20k
Transmitter blk04.gif 1082x888, 12k
Antenna tuner (external) blk05.gif 948x1240, 15k


Schematic Diagrams

The "Ref." column shows the corresponding reference letters from the module identification pictures (where applicable), to help you figure out which part of the radio is described by each schematic.

Description Ref. File Size
Wiring (main chassis) -- sch01.gif 1744x1232, 90k
Transmitter RF T sch02.gif 1744x1232, 70k
Receiver RF U sch03.gif 1744x1232, 70k
Modulator amplifier module V sch04.gif 1744x1232, 62k
Audio amplifier module W sch05.gif 1744x1232, 55k
Receiver power supply module X sch06.gif 1744x1232, 66k
Frequency synthesizer module Y sch07.gif 2381x1231, 117k
IF module Z sch08.gif 2539x1232, 84k
10-freq. crystal oscillator BB sch09.gif 1193x768, 17k
Receiver servo CC sch10.gif 1196x778, 38k
Transmitter servo DD sch11.gif 1172x809, 19k
Control box -- sch12.gif 3042x1226, 104k
Wiring (mounting) -- sch13.gif 1744x1232, 94k
Transmitter power supply EE sch14.gif 778x1159, 36k
Motor drive power supply FF sch15.gif 1187x772, 26k
Interconnect relays GG sch16.gif 1197x794, 36k
Transient protector (external) -- sch17.gif 1201x790, 34k
Antenna tuner (external) -- sch18.gif 1744x1232, 68k

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