I have 3 Cunningham transmitters and I need to put them on my Frequency which is 990khz AM. They are crystal controlled transmitters, I would like to know where I could obtain those Crystals.
Thank you for your cooperation
What kind of Crystal does it use, as in what model or shape, and is it Fundamental or High Frequency and divided down? Since they are Cunningham models I'm guessing Fundamental, he builds in a direct fashion using simple circuits, from what I've seen.
Cunningham must be some kind of a mad Transmitter Scientist, his Rigs and the way he presents them is something special. It's like there are a number of his Transmitters around the world, and yet he's just a one man company!
Would this company make a 540 kHz crystal? The type I need is a 4 pin crystal oscillator. Also I need another one for 1200, 1440.
Patrick, please explain your situation more fully, we need more information to give a higher quality answer. Plus, I'm interested in what kind of Cunningham transmitters those are.
Radio Silence, it sounds like what you need are programmable DIP oscillators. I find that Digi-Key is a good source, place an order and they program it to frequency. You can easily get mediumwave frequencies down to 1 mhz, and can get blank ones if you have a programmer or can find out how to program one from a PC.
Have a look:
The 5 volt full size ones have been successfully used to directly drive a FET final in a part 15 circuit, as they are 5 volt TTL output squarewave.