WØIVJ's Telephone Remote
(Click on pictures to enlarge)
My job requires that I travel, so in order to enjoy my amateur radio hobby,
I constructed a telephone interface which enables me to run my ham station
remotely. Basically the interface allows me to dial my home phone
number and connect my interface with a password after the answering machine
answers. The interface recognizes the password and takes the line
away from the answering machine as if someone had picked up the phone.
I can then send tones to the interface which are converted into ascii commands
which are sent to my TS-450S transceiver over an RS232 interface.
The transceiver responds in ascii over the same interface, and the responses
are converted into short sentences and enunciated back over the phone line.
When the voice enunciator is active the microphone and audio from the transceiver
are disconnected from the phone line. Pictures
F show the construction, and G shows the schematic diagram.
The command structure is listed in the Command
Structure Document, the enunciator vocabulary is listed in the Vocabulary
Document, and the microprocessor code is listed in the Source
Code Document. The source code is for a NetMedia
BasicX BX-24 chip which is a 24 pin chip that holds 8000 lines of Basic
code and has floating point math.
With phone cards being so cheap I can enjoy my hobby for an hour for
a little over $2.00, which is cheaper than a movie and a lot more entertaining.
So far I have operated the station from four states and one foreign country.
I have used both land lines and cell phones. My most unusual contact
was from a cell phone while in a moving vehicle in Kiruna, Sweden which
is above the arctic circle.