I built one of these with the RS-232 option many decades ago. It a three channel HF receiver (5, 10 & 15 MHz) that receives either the U. S. or Hawaii WWVH time and frequency broadcasts and displays the time to a tenth of a second. It also has a discipline function that tweaks a 3. 6 MHz crystal oscillator. So it could be called an HFDO, which was available decades prior to any
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GPSDO like the Thunderbolt or Stanford Research PRS-10. The PST 1020 is a newer WWV/WWVH clock which is faster to acquire the time. In the photo at the top of the page the clock has just been powered up and is searching for the signal using only the 53" whip antenna. When the speaker is turned on you can hear the signal but the clock is not capturing the data stream. Maybe the signal is too weak, or the receiver needs to be aligned It`s also possible that the "8" digits are an artifact of the camera exposure. Using the HP 8648A signal generator, with the 1E2 modulation option, it`s possible to generate an RF signal at 5, 10, or 20 MHz with either 100 or 1000 Hz modulation (and a choice of sine, square and other 100% AM waveforms). There is an audio file that could be used to AM modulate the signal generator and should cause the clock to display the encoded time. A better way would be to have a PIC micro controller clock that outputs the 100 & 1000 time code data as audio to feed the AM input of the sig gen. Guessing that the problem might be: (1) crystal that`s not too active or (2) a weak Q305 (2N5770) transistor, (3) too close to the bandwidth of the scope or some combination of these. BUT. . after returning them to the original locations testing at 5 MHz showed the yellow data LED will light with 100 Hz modulation and the capture LED with 1 kHz modulation. But after trying 10 Mhz, no luck on either 100 or 1000 Hz...
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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