Modernization of ALAN radio stations. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Civil radio communications
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I want to offer a simple prefix for radio stations such as ALAN 48 plus, 78 plus, ALAN 28 and some others. These stations have memory but no "DW" or "memory scan" mode. These modes are "hardwired" in some processors, but such information is not always available. Below is a diagram of the prefix for scanning.
Optocouplers are connected to the memory buttons. Diodes VD1...VD6 improve noise immunity. C3, R3 determine the waiting time after carrier failure.
C1 or R1 determine the frequency of the generator (a few hertz) for stable operation of the system. Resistor R3 can be excluded, then the capacitance C3 is about 6800 pF. C1, C3 should be taken with the smallest possible TKE. The polarity of connecting optocouplers depends on the type of processor. It's easy to pick her up. Optocouplers are connected to the legs of the processor or to the memory buttons. In "48 plus" it is not recommended to use buttons M1, M3, because they are already loaded with transistor switches. The circuit has been tested with ALAN 48 plus and has been working steadily for several months.
Author: O.Kosov, Rostov-on-Don; Publication: N. Bolshakov, rf.atnn.ru
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