A simple PTT for a bourgeois station. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Civil radio communications
Comments on the article
I made an external power source for the slut and faced the fact that when the battery is unhooked, it is inconvenient to hold the station in hand. Yes, and a thick antenna cable also interfered. The conclusion is to make an external tangent. Bourgeois stations switch to transmission if a resistance of less than 2 kOhm is detected at the external microphone input. After some thought, it was decided to experiment.
Version 1
A high-impedance speaker (Chinese 0,2 W, 32 Ohm) is connected to the output of the ULF station through a normally closed contact of the button. When you press the button, the speaker connects to the microphone input and puts the station into transmission mode.
Ris.1
Pros: simplicity. Disadvantages: quiet modulation.
Version 2
Any small speaker is constantly connected to the ULF output. A small-sized bourgeois-made microphone is connected to the microphone input via a button. When the button is pressed, the current drawn by the microphone will put the station into transmission. If this does not happen, you need to choose a resistor connected in parallel with the microphone. Approximately its resistance is 10 - 20 kOhm. The button is included in the ground wire break, because. sometimes hand pickup is audible on transmission if contacts are included in the signal wire. The speaker can not be placed in the tangent and then its size is limited by the size of the microphone and button.
Ris.2
Pros: simplicity, small size. Cons: no volume, squelch, frequency controls.
Connector pinout
Actually, at Alinco stations, you can supply +3 Volts to the microphone, there are three wired connections, but two are also enough. But still, in this case, it is better to use a two-pin connector. On all Ft-scales, the connection is two-wire.
Ris.3
Author: Sergey Gimaev; Publication: N. Bolshakov, rf.atnn.ru
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