RF-10 (Takt 1) The Czechoslovak army manpack VHF radio review - part 10 - Battery pack voltmeter (EN)

Battery pack service voltmeter for RF-10. This device is used to verify the charge level of the battery and the individual cells inside. The voltmeter is simply connected via the connector to the battery terminals. 

Immediately after connection, the voltage of the battery pack is measured at no load. After pressing the right load button, the load (bulb) is connected. For new, freshly charged cells, the voltage should not fall below 6.5V when tested with a load. On the left side of the device there are two sockets (+ red and –black) and a load button. These sockets are used to test individual cells inside the battery pack (again, we can measure with or without load). During testing, we connect the supply cables to the individual cells (!). 

Max. the input voltage of the voltmeter in this case is 2V. For a new, freshly charged cell, the voltage with the load should not fall below 1.25V and should not differ significantly from the voltage of the other cells.

73 - Petr, OK1RP

RF-10 (Takt 1) The Czechoslovak army manpack VHF radio review - part 9 - Battery pack discharger (EN)

Battery box discharger (3QK 051 87) for RF-10. There are two variants of RF-10 battery packs discharging boxes. Older and newer versions are quite different. 

The older variant contains electronics and is able to end the discharge of the power supply box when the voltage reaches around 5V. 

The new version contains only power resistors and a light bulb. The discharge therefore takes place until the source box is completely discharged which is dangerous for the cells of course! The discharge current is approximately 800mA. The schematics of the newer version of the discharger is below.

The schematics of the newer discharger version 

Older version of the discharger with smart end-stop circuitry

Older version of the discharger inside box

(Foto rights reserved to http://rf-10.nazory.cz)

73 - Petr, OK1RP

RF-10 (Takt 1) The Czechoslovak army manpack VHF radio review - part 8 - accessory, cables and wirings (EN)

QK 643 98 - Main power cable (RF-10 to Box A)

RF-10 battery pack to banana female charging adapter 

QA 114 64 - handset plastic holder

RF-10 power cable (battery charging cable)

3QK 643 67 - Cigarette lighter power cable (Box A)

3QK 643 97 - 19 pins link cable

3QK 643 96 - 19 pins link cable

3QF 644 40 - power jumper

3QF 644 73 - speaker jumper

3QF 644 08 - powering jumper cable

3QK 643 82 - power jumper 

3QK 644 41 - charging power cable

3QF 644 40 - current power cable

QK 643 78 - RF-10 to Box A link cable

73 - Petr, OK1RP

RF-10 (Takt 1) The Czechoslovak army manpack VHF radio review - part 7 - accessory Box F (EN)

Box F is a pass-through filter accessory that reduces the effect of interfering voltages from the vehicle's on-board electronics. 

It is placed between the on-board network terminals and Box C or Box A. It is part of car installation setup and effective part removing interferences and line noises.

Box F is going to be very rare now.

73 - Petr, OK1RP

RF-10 (Takt 1) The Czechoslovak army manpack VHF radio review - part 6 - accessory Box E (EN)

Box E is (as it was described in the preview Box D article) the additional part of charging combo used together with accessory Box D for charging multiple battery packs.

Box E is the non-stabilized 24V / 3A and 12V / 3A power supply designed to power co-operating charging and distribution accessory Box D. It is most often used as a power supply for Box D.

73 - Petr, OK1RP

RF-10 (Takt 1) The Czechoslovak army manpack VHF radio review - part 5 - accessory Box D (EN)

Box D is used in combination with another additional accessory Box E for charging with standard current (450-480mA) up to six RF-10 batteries at once. 

The indicated standard charging time according to the manufacturer is 10-12 hours. Each battery pack connection output has a green light indicating the proper battery connection. When the batteries are being charged, heat is released and it is therefore important to ensure sufficient cooling of the cabinet! 

The picture over here shows the connection of the Box D and Box E (where Box E is installed on the bottom of the stack).

73 - Petr, OK1RP

RF-10 (Takt 1) The Czechoslovak army manpack VHF radio review - part 4 - accessory Box C (EN)

Box C (QP 895 05) is used to supply Box A from the vehicle's on-board 24V line network. 

The Box A allows you to turn on the power signal lamp of both Box A and Box B when voltage is applied to Box C at reduced brightness. Box C can be switched remotely from Box A or Box B. 

The output voltage from Box C is in the range of 10V to 15V and the consumption of the Box C itself is 200 mA. 

The meaning of the symbols on the rear panel is as follows: 

- 12 V output for the signal lamp on boxes A and B 

- 12 V output 

- control voltage input from Box A 

- 20-30V output 

- 20-30V input

73 - Petr, OK1RP