Just over 30 years ago, a customer wanted a roger beep that nobody else had. Started with a "Roger K" board and hacked it to become the infamous "Bump-Bump". The CAD system we used back then under DOS was called Supercad, sold by a company called Mental Automation. They have been gone for a while and so has the last computer here that hosted it.
But this hard copy turned up. It's from 1999 or so, and not totally informative. But it's the essence of what we altered to remove the "dot" from the morse-code letter K. Turned dah-dit-dah into dah-pause-dah. Parts we altered were indicated with an arrow (--->>). The empty square to the right of pin 1 of the 4017 chip is where the diode gets removed to eliminate the "dot" in the morse letter K.
The Taiwan-made Roger K board has been out of stock for 15 or more years now. Got them from a company called Wholesale Parts in Oklahoma. They changed their name to Browning-Tram, selling antenna stuff and coax.
Anyway, here's the schemo for better or worse.
The pot that gets installed in place of a fixed 15k resistor is the variable-pitch control. Later versions changed the .04uf cap below it to a 0.47. This allows the use of a 50k control rather than the 500k shown. Black radios with a 50k squelch control would get hijacked to put the pitch control on the front panel. But only if you didn't care about using the squelch. A surprsing number of our clients never use it. The orange wire shuts down the beep when it's grounded. The PA switch on a Saturn squelch knob has a side that's closed when you click the control at the left extreme of the knob. Can't say I ever encountered a Saturn owner who used the PA feature.
73
But this hard copy turned up. It's from 1999 or so, and not totally informative. But it's the essence of what we altered to remove the "dot" from the morse-code letter K. Turned dah-dit-dah into dah-pause-dah. Parts we altered were indicated with an arrow (--->>). The empty square to the right of pin 1 of the 4017 chip is where the diode gets removed to eliminate the "dot" in the morse letter K.
The Taiwan-made Roger K board has been out of stock for 15 or more years now. Got them from a company called Wholesale Parts in Oklahoma. They changed their name to Browning-Tram, selling antenna stuff and coax.
Anyway, here's the schemo for better or worse.
The pot that gets installed in place of a fixed 15k resistor is the variable-pitch control. Later versions changed the .04uf cap below it to a 0.47. This allows the use of a 50k control rather than the 500k shown. Black radios with a 50k squelch control would get hijacked to put the pitch control on the front panel. But only if you didn't care about using the squelch. A surprsing number of our clients never use it. The orange wire shuts down the beep when it's grounded. The PA switch on a Saturn squelch knob has a side that's closed when you click the control at the left extreme of the knob. Can't say I ever encountered a Saturn owner who used the PA feature.
73
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