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A Multi Band Tube 10 w QSK Transceiver

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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

 

Band, MHz

1,8

3,5

7

10

14

18

21

24

28

Note

L3

*

-

-

28

18

15

15

15

14

11

1

120/30

70/20

-

-

-

-

-

-

-

2

C3

1000

800

600

600

500

400

300

300

200

pF

L2

L5

L6

L7

*

-

-

25

19

15

14

11

10

10

1

120/20

60/20

-

-

-

-

-

-

-

2

C4, C7

C9, C16

200

200

180

150

120

100

100

91

62

pF

L8 *

53/45

27/45

14/40

10/45

8/45

7/45

7/45

6/45

6/45

**

C31

150

150

120

120

100

100

80

50

30

pF

C32

2000

2000

1500

1200

1000

600

600

500

300

pF

C26

1500

1000

1000

1000

470

470

390

300

300

pF

 

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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Last Updated:

August 2, 2016 18:19

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