FUG10 tranceiver, German WWII, WW2

First test with AM.
Has connected a microphone amplifier connected to the transmitter
with a transformer to the Schirmgitter on the output stage.
First QSO was with LA2OLD's AM network.

The E10L and S10L can be used on the new 472 – 479 kHz band.
The E10K and S10K can be used at 3500 – 3800 kHz and the new 60 meter band.
This is my New Fug10 setup. Here is a RX/TX for 472 kHz ham band.

I have installed FUG10 here in Setesdalen in Norway.
I communicate on CW.

Here is the connection to the antenna, Morse code key, and audio output.

Have designed a mounting system.

Connectors for Rx and Tx. The electronics are mounted directly behind the contacts.

fig. 1

Here is the wiring diagram for my hookup of Fug10 transmitter and receiver.
Receiver to the left and to the right transmitter.

Transmitter connector pins:

E ....... 0 Volt / GND
Ant ..... Antenna connector.
+ AS .... 750 Volt DC anode voltage
+ SG .... 100 volts DC, screen grid voltage
-BB ..... GND, heater voltage
+ BB .... 12 Volt heater
G1 ...... Oscillator grid voltage. -220 Volts DC
G2 ...... PA grid voltage -220 volts DC

Receiver connector pins:

E ....... 0 Volt / GND
Ant ..... Antenna connector.
+ ES .... 210 Volt DC anode voltage
EPF ..... RF gain connector
-BB ..... +12 Volt heater
+ BB .... +12 Volt heater
MBB ..... GND, heater voltage
FH1 ..... Audio output
FH2 ..... Audio output, connected to GND

E10K and E10L can be operated at 12Volt directly.
Connect MBB to GND (0 Volt)
Connect +BB and –BB to +12 Volt.
Epf connector is cathode for tube Rø1 and Rø4.
This can be used for RF gain setting.
When Fug10 is in receive mode the pot. R4 in my drawing is connected to Epf.
RF gain can be set at this pot.
When Fug10 is in transmit mode the pot. R5 in my drawing is connected to Epf.
Side tone gain can then be set on this pot.
Audio output is taken from FH1 and FH2.
This is a transformer balanced output.
This is a good way to take out the audio signal,
but here I use an unbalanced amplifier.
The FH2 is therefore connected to GND.
Two zener diodes is used to make a simple limiter for reducing audio
when the key is pressed and before RX/TX relay is activated.
This is some mS when you start transmitting.

+AS is here +750 Volt, but voltages between 500 and 800 Volt are OK.
+SG is +100 Volt. This can be increased for higher output power.
-BB is negative heater terminal, connected to GND.
+BB is positive heater terminal, connected to +12V
All my Fug10 transmitters are converted to 12 Volt.
G1 is the oscillator grid. This has a negative voltage of -220 Volts via a 56k resistor.
The morse key ground this to 0 Volt. The oscillator will then start up.
G2 is the PA grid, and are also connected to the key.
The PA current can be adjusted with the pot. R3 in fig.1
IRF530 mosfet is used for RX/TX relay operation.
Time constant is set by 180K resistor, 10K resistor and 22uF capacitor.

Converting S10K and S10L to 12 Volt.

The heating voltage on these transmitters is 24 Volt.
It is much easier to operate all radios on 12 Volt.

1 – Make a strap over resistors W7 and W12.
2 – Disconnect resistor W11.
3 – Connect tube Rø2 (W11 terminal) to –BB
4 - Connect tube Rø3 (W11 terminal) to +BB

This is a power specifically designed for the German transmitters and receivers in Fug10.
Transmitter S10K/S10L and receiver E10K/E10L.
Input voltage is 12VDC.
Output voltages are 12VDC, -210VDC, 210VDC and 800VDC.

I use a cheap box from IKEA in this design.
Has a front plate made of copper for optimal cooling.

Here are some of the components to be on the front plate.

This is the receiver power section.

Here is the 800 Volt section. Eight capacitors are connected in serial.

The front plate is made of copper for better cooling.

Here is the Power finished.