neazoi
Advanced Member level 6

Hi, I consider the MC1648 as an oscillator in LC mode for HF CW transmitting.
I would like to know to things:
1. What sort of output power and impedance should I expect out of it? (in order to see what will be the drive to the power amplifier)
2. What sort of frequency stability should I expect out of it? Is it enough for CW transmitting on HF amateur bands? I am thinking of a low span, changing coils for each band.
Or maybe I should use a CD4046 instead?
My goal is to make the oscillator as simple as possible.
- - - Updated - - -
Update:
The newer MC12148 has enough frequency stability for ham use, provided that a stable PSU is used. But the MC1648 (I like DIP packages) does not specify frequency stability, although the two chips internal diagrams are identical as far as I can see.
Any guess?
I would like to know to things:
1. What sort of output power and impedance should I expect out of it? (in order to see what will be the drive to the power amplifier)
2. What sort of frequency stability should I expect out of it? Is it enough for CW transmitting on HF amateur bands? I am thinking of a low span, changing coils for each band.
Or maybe I should use a CD4046 instead?
My goal is to make the oscillator as simple as possible.
- - - Updated - - -
Update:
The newer MC12148 has enough frequency stability for ham use, provided that a stable PSU is used. But the MC1648 (I like DIP packages) does not specify frequency stability, although the two chips internal diagrams are identical as far as I can see.
Any guess?