04-01-2017, 04:56 PM
(This post was last modified: 04-01-2017, 04:56 PM by Murphyv310.)
Hi.
Personally I wouldn't build a Micro TX without a tank coil circuit. It's advantages are that it will filter out harmonics and due to that will produce a sine wave at it's output.
One for Terry, I can assure you that you can get sub harmonics from "fundamental" crystal frequencies, they are very low amplitude and usually disregarded, I know of no application that they have been utilised in. I do agree that perhaps Mike is getting confused with overtone crystals which in the main are used for VHF applications where the third harmonic is used, it's easier to make a 3rd overtone crystal for 144 MHz say than a "straight" 144 MHz Crystal.
Personally I wouldn't build a Micro TX without a tank coil circuit. It's advantages are that it will filter out harmonics and due to that will produce a sine wave at it's output.
One for Terry, I can assure you that you can get sub harmonics from "fundamental" crystal frequencies, they are very low amplitude and usually disregarded, I know of no application that they have been utilised in. I do agree that perhaps Mike is getting confused with overtone crystals which in the main are used for VHF applications where the third harmonic is used, it's easier to make a 3rd overtone crystal for 144 MHz say than a "straight" 144 MHz Crystal.
