ANTENTOP- 01- 2010, # 012

A Multi Band Tube 10 w QSK Transceiver

Tuning and Adjustment

Transceiver made from right parts should work straight away. You need only to tune (by GDO or RF- Voltmeter) the plug-in inductors for the needed frequencies. At self-exciting of the RF-Amplifier at the any band vary the value of the R4 that is installed at plug- in inductor. C24 can adjust amplification of the audio amplifier. The audio amplifier works well only with high- ohmic headphones.

The transceiver has no special circuit for frequency shift at RX/TX mode. The shift occurs automatically because of a difference in parameters "cold" and "hot" V5.

In my case the shift was near 300- Hz at 160 and 80- meters and more the 1000 Hz at 10- meters. You may install the shift by playing with C7, C14 and C16.

*Note from I.G.: At the old times, when the transceiver was made (80- 90s) I had a box with headphones. There were old headphones (from 1941- to 1980) from receivers and phone systems. The headphones were made in different countries- Russia, German, Britain and Poland and may be in some others. I tested the phones at first with a simple crystal (diode) receivers then with DC- receivers and choose most sensitivity ones. With such phones I could receive very weak stations that at less sensitivity headphones were not unheard. If you have box with high- ohmic head phones (or several samples anyway) try to find mostly sensitivity ones from them.

Table 2 Data for Inductors

Note 1. Inductors made on Russian resistors MLT-2 (value more the 100- kOhm), winding on all the length.

Figure 2 shows the resistor.

Note 2. Inductors made on Russian resistors WS- 2 (value more the 100- kOhm), winding on all the length.

Figure 3 shows the resistor.

* First column- numbers of turns, second- length in mm

** Diameter L8- 34- mm

L1 (numbers of coil near 30% from L2) is wound above L2. L4 (numbers of coil near 30% from L5) is wound above L5.

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