A simple VFO for the Ural-84 transceiver. Scheme, description

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A simple VFO for the Ural-84 transceiver. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Civil radio communications

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I propose a simple GPA, which has proven itself very well in the Ural-84 and Rosa transceivers. The frequency distribution is given in table. 1, coil data - in table 2.

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Frame diameter - 7,5 mm. Wire - PELSHO-0,44. Tuned cores - SCR. L19 - 20 mm in diameter, 15 turns of wire 0,8. You can use a coil from the GPA R-105.

Table 1
Range Frequency Doubling
28MHz 11.25-12.0 22,5-24,0
24MHz 9,695-9.745 19,39-19,49
21MHz 7.75-7.975 15.5-15.95
18MHz 6.25-6.300 12.5-12.6
14MHz 8.5-8.850 15.5-15.95
10MHz 7.75-7.975 12.5-12.6
7 MHz 6.25-7.975 12,5-12.6
3.5 MHz 8.5-9 no
1.9MHz 7.33-7.43 ' No

Table 2
28MHz L1-4 turns L2-2 turns
24 L3-5 L4-2
21 L5-8 L6-3
18 L7-7 L8-4
14 L9-7 L10-4
10 L11-10 L12-2
7 L13-10 L14-4
3,5 L15-7 L16-4
1,8 L17-8 L18-4

GPA capacitors are selected during setup. In my version, C1-39, C2 - 200, C3 - 390, C4 - 120, C5 - 220, C6 - 820, C7 - 220, C8 - 680.

Author: V. Karasev (UT4EH); Publication: N. Bolshakov, rf.atnn.ru

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