VT2 may have voltage 80- 150-V. Any low power double triode may
be used at receiver (VT5). Any low power RF- pentode may be used
Coil L4 may be moved along L5. It is need to get optimal regime for the
regenerative receiver. Figure 2 shows the design of the receiverís coil.
Relay K1- any suitable relay. R18 limited current through the
Tuning† of the Radio Station
The tuning is simple and takes one evening if the radio station is made
from right parts that are installed in correct way.
At first do tuning of the receiver. Receiver should receive something
with antenna at least 3 meters long. Tune L3C12S3 for the best
receiving. With help C19 set the receiver to the middle of the
160-meters band. Be sure, that C18 covers all 160-meters band.
R6 should provide a smooth regeneration control. If not, change
the distance along L4 and L5. If it is no regeneration, switch
visa versa terminal of L4 or decrease distance between L4 and
L5. Set the receiver in the middle of the 160s and tune L6C20
and then L7C23 on to maximal sensitivity.
The second, do set up of the transmitter. Begin
from the VFO. Using MW receiver set the VFO to 900- kHz (300-meters).
Load the transmitter to a 50-Ohm/10-Wtts resistor or bulb having
resistance in range 50- 300- Ohms. Adjust doubler
L2C5 on to maximum output power of the PA. Audio amplifier/modulator
works straight away at right parts. Audio transformer T1 was used
from an old tube receiver.