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lower chassis |
upper chassis |
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lower chassis |
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middle chassis |
lower chassis |
PRC-25 X2 | ||
PRC-25 X3 | ||
PRC-25 X4 |
Module# | Module function | SMD# | REV"A" | SMD# | PRC25? | PRC77? |
A1 | DC/DC Converter | 447269 | .. | . | yes | not needed |
A2 | PA Tank | 447620 | . | . | yes | repl/w A32 |
A3 | 1st Rx RF Amp | 447555 | . | . | yes | repl/w A33 |
A4 | 2nd Rx RF Amp | 337556 | . | . | yes | repl/w A34 |
A5 | Rx Mixer | 447462 | . | . | yes | repl/w A35 |
A6 | Tx IPA | 447557 | . | . | yes | repl/w A37 |
A7 | Tx 2nd RF Amp | 447558 | . | . | yes | no |
A8 | Tx 1st RF Amp | 447559 | . | . | yes | no |
A9 | VFO | 447554 | . | . | yes | repl/w A39 |
A10 | Interval Oscillator | 447407 | . | . | yes | repl/w A40 |
A11 | Discriminator | 447446 | yes | ? | yes | yes |
A12 | 2nd Mixer | 447447 | yes | ? | yes | yes |
A13 | 53 MHz Filter | 447448 | . | . | yes | repl/w A43 |
A14 | 1st Mixer | 447449 | . | . | yes | repl/w A44 |
A15 | 1 MHz Spectrum Gen | 447450 | . | . | yes | repl/w A45 |
A16 | Voltage Regulator | 447451 | yes | ? | yes | yes |
A17 | Phase Comparitor | 447452 | yes | ? | yes | yes |
A18 | 5.6 MHz IF | 447453 | yes | ? | yes | yes |
A19 | 1/4 Wave Network | 447454 | . | . | yes | no |
A20 | Sidestep Oscillator | 447455 | . | . | yes | no |
A21 | RX If limiter | 447177 | yes | 875724 | yes | yes |
A22 | Speech Amp | 447314 | . | . | yes | yes |
A23 | Tone Generator | 447316 | . | . | yes | yes |
A24 | Tone Squelch | 447318 | . | . | yes | repl/w A54 |
A25 | Rx Audio | 447113 | . | . | yes | repl/w A55 |
A26 | . | . | . | . | . | . |
A27 | . | . | . | . | . | . |
A28 | Antenna Loading | ? | . | . | yes | yes |
A29 | Tx PA | ? | . | . | yes | no |
A30 | Filter | ? | . | . | yes | no |
A31 | Tx Frequency Control | ? | . | . | no | yes |
A32 | RX Input | ? | . | . | no | yes |
A33 | Rx 1st RF Amp | ? | . | . | no | yes |
A34 | Rx 2nd RF Amp | ? | yes | ? | no | yes |
A35 | Rx Mixer | 448751 | yes | ? | no | yes |
A36 | Tx PA | ? | . | . | no | yes |
A37 | Tx IPA | 448745 | . | . | no | yes |
A38 | Tx VFO | ? | . | . | no | yes |
A39 | Synthesizer VFO | ? | yes | ? | no | yes |
A40 | Interval Oscillator | ? | yes | ? | no | yes |
A41 | . | . | . | . | no | no |
A42 | . | . | . | . | no | no |
A43 | 53 MHz Filter | 448739 | . | . | no | yes |
A44 | 1st Mixer | ? | yes | 621272 | no | yes |
A45 | 1 MHz Spectrum Gen | 448750 | yes | ? | no | yes |
A46 | . | . | . | . | no | no |
A47 | . | . | . | . | no | no |
A48 | . | . | . | . | no | no |
A49 | . | . | . | . | no | no |
A50 | Tx Mixer | 448753 | . | . | no | yes |
A51 | . | . | . | . | no | no |
A52 | . | . | . | . | no | no |
A53 | . | . | . | . | no | no |
A54 | Tone Squelch | ? | yes | 875637 | no | yes |
A55 | Rx Audio | 448752 | . | . | no | yes |
A56 | . | . | . | . | no | no |
A57 | . | . | . | . | no | no |
A58 | . | . | . | . | no | no |
A59 | . | . | . | . | no | no |
A60 | Wide Band Attenuator | ? | . | . | no | yes |