I have managed to let the stock ATS-3A transceiver transmit nice BPSK31 `cq ok1iak`. The firmware of ATS-3A was modified to allow serial line control, which is performed over the DASH paddle pin in straight key mode. That means paddle will not work if in remote control mode. To enable both remote control and paddle woul
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d need hardware modification of the stock ATS-3A. The only way to shape the BPSK31 envelope on a stock ATS is to key the transmitter on/off. The envelope is far from raised cosine, but the signal is not wider than of CW and the sidelobes will be hopefuly negligible at QRP levels. I tested common windows PSK31 programs how they will cope with that non ideal envelope. MIXW32, MultiPSK, DigiPan and PocketDigi worked well, WinPSK had occasional drop outs. Here is the screenshot of BPSK31 signal received on RadioShack DX-398. On the lower part of the screenshot the receiver may have been overloaded. RTTY or MFSK16 modulation patterns may be generated by ATS perfectly. Olivia uses symbol shaping, but I bet hard keying like in the case of MFSK16 will work good enough. The serial line hardware protocol is 1200Bd asynchronous, 8bit, 1 start, one stop bit. Because I am targeting mainly handheld computers, the serial stream is generated by a sound card in the 202 format and transformed to the 0/3. 3V digital levels by an external FSK decoder. The two tones are 1200Hz mark and 2200Hz space. The tones are converted to 0V for space and 3. 3V for mark. I did not implement ATS support into PocketDigi yet, I only wrote a simple C+ application to generate WAV sound files with various commands. Those WAV files may be played on a PC, Pocket PC or even on a mobile phone or MP3 player. I will be happy to provide modified ATS-3A firmware source...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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