Until recently it was released a lot of types of consoles-UHF selectors, designed to receive television signals in any of the 21 UHF channels (21 to 41) and convert them into signals meter band (1st and 2nd channel). No unit in the UHF TV previous generations had a lot of people buy consoles UHF.
In Vitebsk was recently included transmitter at the 48th channel. To expand the receiving band to 59th channel offer the simplest revision consoles-selector "Uman" and similar with range 41 21 ...channels. The improvement consists in increasing the voltage settings (UH) varactors to 26 In (instead of 18). To do this you must break the connection between the resistors R2 and R3 of the stabilization unit and submit the pin 3 resistor R2 to R1 (Fig.1).
You can do this by switching a toggle switch (Fig.2) - then there remains a range of 21...41 channel.
Fig.2
After that - to make adjustments to the 48-th channel (or something of that order) as usual. This revision likewise done on other types of consoles-UHF selectors, will handle 41 21...channels. Their almost uniform.
Author: V. Raskov, Vitebsk; Publication: N. Bolshakov, rf.atnn.ru