Deutsche Version - German Version German Version

DC9DZ: Project Katana 12K – Power Amplifier (PA) using two GU78b

Data of DRESSLER Katana-12K RF Linear Amplifier

Frequency bands all HF amateur bands 1.8 MHz to 29.7 MHz
Power supply 2 power supply transformers 7000 VA & 1.5 VA
Plate voltage 3450 V at full output power
Screen voltage 330 V stabilized
Grid voltage - 70 V +/- 12 V regulated
Filament 27 V / 7.4 A
Input SWR 160
15
m – 17 m
m – 10 m
< 1.35 : 1
< 1.50 : 1
Gain (1.8 – 29.7 MHz) 20.0 dB
Amplification Input power Output power  
Measured with a Bird Power Meter, Model 43, PEP, on a single 230 V line with 16 A fuse. 10 W
20 W
30 W
40 W
50 W
60 W
70 W
80 W
90 W
100 W
110 W
120 W
  1000 W
2000 W
3000 W
4000 W
5000 W
6000 W
7000 W
8000 W
9000 W
10000 W
11000 W
12000 W
 
Input SSB Signal 10% of full 1.5 KHz Modulation
on / off Ratio 1:9, Interruptions: 30 Hz
Output limited by Software RTTY / CW / SSB:   2800 W / 6000 W / 13000 W
Harmonic Output 50 dB below rated output
IMD - 43 dB @ 25% power output
- 37 dB @ 50% power output
- 33 dB @ 100% power output
Tube Two Svetlana GU-78b
Input network 50 Ohm, 200 W HF Resistor,
5 pol. Chebychev Low Pass Filter, switched
Output network Inductor: 15 uH, Caps: 250 pF var. + 400 pF fixed / 1000 pF var. + 330 nF fixed
Computer control Plate current (every 5 msec), SWR, all switching functions,
no relais switching under power conditions, soft start inrush, 240 sec delay time for full power, 2 speed turbine blower

Well regulated screen and grid supply for +ve and -ve currents as well as current limiting to protect the tube and minimize the IMD. It is impossible to override the screen and grid dissipation at any working conditions.
Metering Output, SWR, Plate current, Plate voltage,
Screen & Grid current / voltage
Housing High quality black eloxial aluminia
Dimension 548w x 159.5h x 512d mm³
Weight 54 kg
Price 230 V line with CEE 1-32 (32 A): 9480 €
optional SSB Tuning Aid 120 €
Click image to enlarge
Click image to enlarge
Click image to enlarge
Click image to enlarge
Click image to enlarge
Click image to enlarge
Click image to enlarge
Click image to enlarge
Click image to enlarge
Click image to enlarge
Click image to enlarge