[time-nuts] fast switching quiet synthesizer

Garry Thorp GThorp at pascall.co.uk
Wed Oct 8 04:33:24 EDT 2014

It might be worth looking at Holzworth. They make a range of single and multi channel synthesisers covering different levels of phase noise and switching speed.


Date: Tue, 07 Oct 2014 10:02:55 -0700

From: Jim Lux <jimlux at earthlink.net>

To: Discussion of precise time and frequency measurement

<time-nuts at febo.com>

Subject: [time-nuts] fast switching quiet synthesizer

Message-ID: <54341CBF.9080903 at earthlink.net>

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At work, I'm putting together a multichannel stepped frequency CW radar breadboard, and I'm looking for something to serve as a source that I can step quickly.

I'm looking at stepping every millisecond or so. Right now, I use a Ardunino type microcontroller driving a serial DAC driving a VCO, but that's a bit wonky and noisy, although it's easy to get the step timing right on. The spectral purity is, shall we say, downright ugly.

Since I'm going to be doing precision ranging with this, the spectral purity has to be reasonably good (not 1E-15 at 1000 seconds good, fortunately)..

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