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Deltamodulation is a simple binary pulse transmission method that can be readily adapted to transmit dc signal levels. It is particularly useful where only a few channels are to be sent, and where one per cent accuracy suffices. A signal-channel demonstration system has been built and tested. The high-speed limitation of such a system takes the form of a finite rate-of-rise, well suited to most telemetering. If, on the other hand, sudden large signal changes are expected, then the system may be modified accordingly. The modified system has the interesting property of giving accuracy varying exponentially with the pulse rate (as in PCM), but still without the necessity of framing the pulses.