Letter Re: Expedient Field Telephones and Lightweight HF Transceivers
Mr. Rawles, I have been reading your blog for a few weeks now and I noticed that many references are made using the surplus TA-1 telephone. A household telephone can be used for a point-to point two-way communications by using 4 wire cable, a 9 volt battery (better 12 volts) a 300 ohm resistor, two momentary switches and two signal devices such as a piezzo device or buzzer. A 9 volt battery will furnish telephone comm. for several miles but have never used one over two miles. I am also a Amateur Radio Operator, (57 years) and if you must …