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Need RF oscillator, phase modulation capable

Started by George January 29, 2013
Can someone suggest where I should look for a used tunable RF oscillator around 1 MHz that can be phase modulated from an external input?
On Jan 29, 7:32=A0pm, George <geo...@thefiftysports.com> wrote:
> Can someone suggest where I should look for a used tunable RF oscillator =
around 1 MHz that can be phase modulated from an external input? Depending on what you are doing a Direct Digital Synthesizer might be a good way to do what you are trying to do. Another thought is to use quadrature modulation on a fixed 1MHz source. If you are looking for a 1 MHz VCO with a frequency adjust, it may be tough to translate that to phase modulation. I suppose you could build some kind of PLL. I think we need more info to give better advice.
George <george@thefiftysports.com> wrote:

>Can someone suggest where I should look for a used tunable RF oscillator around 1 MHz that can be phase modulated from an external input?
A Rhode & Schwarz SMDA should do that. I recently sold mine for about $100 -- Failure does not prove something is impossible, failure simply indicates you are not using the right tools... nico@nctdevpuntnl (punt=.) --------------------------------------------------------------
On 01/30/2013 01:32 AM, George wrote:
> Can someone suggest where I should look for a used tunable RF oscillator around 1 MHz that can be phase modulated from an external input? >
Simplest approach -which may or not satisfy your unstated requirements: If you just want some discrete phases (e.g 4, as in QPSK), you could start with on oscillator at 4 times the frequency and digitally generate the 4 phases. Then, choose the one you like and, if required, try to filter out harmonics. Pere
On Jan 29, 7:32=A0pm, George <geo...@thefiftysports.com> wrote:
> Can someone suggest where I should look for a used tunable RF oscillator =
around 1 MHz that can be phase modulated from an external input? If a square wave is OK, you could use the VCO from a 4046 type part. George H.