One transistor TX (50MHz DSB)...1trtxph.gif
I challenged to make very simple transmitter. It is constructed with only one transistor. It makes DSB signal. It can make QSO with normal SSB station. ***
See fig 1! Carbon microphone modulates 50MHz CW signal. It produces a double sideband signal. It pass through the 50MHz band pass filter. It is radiated by the antenna. ***
See fig 2! Modulator is constructed by diode single balanced mixer. ***
See fig 3! This machine is transmitter. Therefore I must use another transceiver in order to receive the report from my QSO friends. ***
See the table! With this machine I made four QSO's with friends living 50Km distance from me.
Table1: result of one night local expedition by this transmitter. All QSO was mwde on 18 Dec 1993.
| time(JST) | QTH of contact station | distance(km) | Report receiv | memo |
| 2121 | Kumagayacity | 67 | 41 | Not good signal.But recognized. |
| 2140 | Kawaguchicity | 57 | 34 | Only call sign was copied. |
| 2205 | kazocity | 47 | 45 | He could hear that I say " Carbon mic is used". |
| 2215 | Kakegawacity | 57 | 45 | Small beet was heard. Carbon mic was heard. |
Created By JF1OZL
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