The hand dynamo ZD 31-1 was used as a source for the rdst transmitter RM-31-P and RM-31 A. It was possible to recharge the batteries from the set of this rdst.
Due to its power, the dynamo is designed for two-crank drive - 85 rated revolutions per minute. The direction of rotation is to the right.
During operation of the transmitter supplied dynamo:
- anode voltage and voltage for the shielding grid of the tube E 7 and the anode voltage for the tube E 5 by 400 V,
- negative preload of the control grids for tubes E 5, E 7 and E 16 and negative voltage of the braking grid of tube E 7 from the side - 125 V,
- heating voltage for tube E 7 and supply current for winding relays Re 2 and RE 1 from side 4.8 V.
When recharging the batteries from the rdst set, the dynamo supplies a charging current of 5.6 to 6.7 V.
The dynamo is attached with a folding tripod chair. The dynamo operator sits on the seat of the unfolded chair during operation and spins the dynamo cranks. For carrying, the chair is folded, the boys are flipped over and the whole is pushed into the carrying frame, adapted to be carried on the back together with the bag.
If necessary, the dynamo can be used on the fly. The folded dynamo is protected against rain and dust with a canvas bag.
Hand dynano consists of:
- from a chair with a dynamo cover,
- from dynamo ZG 50,
- from attachment to dynamo ZG 50.
Weight kg: 11 (with carrying frame, canvas bag and connecting cord 21.5 kg)
Source: Mat spojIII-34 Manual dynamo ZD 31-1 Description with instructions for operation and maintenance - ČSLA regulation, Prague 1976
Due to its power, the dynamo is designed for two-crank drive - 85 rated revolutions per minute. The direction of rotation is to the right.
During operation of the transmitter supplied dynamo:
- anode voltage and voltage for the shielding grid of the tube E 7 and the anode voltage for the tube E 5 by 400 V,
- negative preload of the control grids for tubes E 5, E 7 and E 16 and negative voltage of the braking grid of tube E 7 from the side - 125 V,
- heating voltage for tube E 7 and supply current for winding relays Re 2 and RE 1 from side 4.8 V.
When recharging the batteries from the rdst set, the dynamo supplies a charging current of 5.6 to 6.7 V.
The dynamo is attached with a folding tripod chair. The dynamo operator sits on the seat of the unfolded chair during operation and spins the dynamo cranks. For carrying, the chair is folded, the boys are flipped over and the whole is pushed into the carrying frame, adapted to be carried on the back together with the bag.
If necessary, the dynamo can be used on the fly. The folded dynamo is protected against rain and dust with a canvas bag.
Hand dynano consists of:
- from a chair with a dynamo cover,
- from dynamo ZG 50,
- from attachment to dynamo ZG 50.
Weight kg: 11 (with carrying frame, canvas bag and connecting cord 21.5 kg)
Source: Mat spojIII-34 Manual dynamo ZD 31-1 Description with instructions for operation and maintenance - ČSLA regulation, Prague 1976