Notes and various about this indian military radio.
All schematics are a "View From Top", like seeing in X-ray from the top. That was easier to reverse the PCBs.
Coil trimmers value is not known, markings on them are like "108 205", "108 201", etc.
Known values of caps might not be right, some have color code (top to bot: orange red red) or only military part number without a lookup table.
Unless determined by schematics, Test Points doesn't have indications on what they are.
- Some specs: http://www.greenradio.de/htm2/e_lhp219.htm
- Full teardown: https://www.youtube.com/watch?v=M3-ErxbTwJw
TP
J3: LSB Filter In
J4: GND
J5: CW Filter In
J6: RF in from pin3 (pin 3 of H14 connector, coax white/blue)
J7:
TP
J3: LSB Filter Out
J4: GND
J5: CW Filter Out
J6:
J7:
TP
J3: Audio Out (to front connectors)
J4: Audio In (from RX circuit through 108k gain pot)
TP
J3: Emitter of Q3
J4:
TP
J3:
J4:
J5:
TP
J3: Q1 in from IC2
J4: Q3 in from IC1
TP
J3:
J4:
Pins
1: +18V (TP J2)
4: +14V (TP J3)
7: In
10: GND
24V.
A -
B +
C N/C
Untested.
+
goes to battery +
, minus..., ?
are unknown.
+ -
? ?
? -
H189 or H250 might works, connector is a U-183/U
, corresponding headset connector is U-182B/U, U-229/U
.
Name | "Schematized" | Reference 1 | Reference 2 |
---|---|---|---|
Tuned Amplifier | Yes | N 43586 | H5 |
Coil Block | No | N 43553 | H15 |
Voltage Controlled Oscillator | Not Yet | N 43929 | H16A |
5 Bit D/A Converter And Summing & Buffer Amplifier | Not Yet | N 43847 | H18 |
Programmable Divider | No | 1000 043 538 40 | H20 |
Phase Comparator | Yes | N 43537 | H21 |
Frequency Detector And Standard Divider | Not Yet | N 43848 | H22 |
BULOVA TXCO-1 FREQ 3.5MHz | N/a | A410181 | H24 |
Voltage Regulator +18V +14V | Yes | 1140 001 980 78 | H25A |
Switching Regulator 5V | No | N 43531 | H26 |
Name | "Schematized" | Reference 1 | Reference 2 |
---|---|---|---|
Power Supply | No | N 43680 | H1 |
Driver | No | N 43685 | H2 |
Aerial Filter, ALC & Metering Unit | No | N 43655 | H3 |
Name | "Schematized" | Reference 1 | Reference 2 |
---|---|---|---|
Filter In | Yes | N 43706 | H6 |
Filter Out | Yes | N 43707 | H7 |
A.G.C | Yes | N 43708 | H8 |
Detector And Receive Audio | Yes | 1140 006 871 52 | H9A |
1750/1751KHz Generator | Yes | N 43710 | H10 |
Summing Amplifier And 10V Regulator | Yes | N 43711 | H11 |
Transmitter IF | Yes | N 43712 | H12 |
Transmit Audio And Tone Generator | Yes | N 43713 | H13 |
Crystal Filter CW Freq 1.75MHz | N/a | ||
Crystal Filter LSB Freq 1.75MHz | N/a |
Name | "Schematized" | Reference 1 | Reference 2 |
---|---|---|---|
Power Amp | No | N 43668 | H4 |
Audio path (WIP):
H16A p19 -> (brown) -> [gain pot, 108k] -> (green) -> H9 J2 p4 -> [magic] -> H9 J2 p3 -> (blue) -> front connector