[time-nuts] Symmetricom CSAC is Cs acting like a Rb unit
ericksonc2 at comcast.net
Wed Jan 19 07:16:19 UTC 2011
Don't overlook the fact that it also puts out a square wave signal. Great
for a digital clock pulse, but for a clean radio reference you also have to
remember the nature of a square wave - it is an infinite number of odd
harmonics. There's a lot of built in jitter. You'd need to filter the heck
out of it to get it down to a 10 MHz sine wave. The level may then need to
be boosted back up to a usable level.
Really neat device though.
>Well, the phase noise is not as good as other Rb sources that can be
>had for around $100 that are not much bigger in size. For example the
>FE-5650A or even the FE5680A Rb's.
>Would it be useful ? That depends upon your operating requirements.
>For wide band FM at 10 GHz it would be ok, but for narrow SSB I would
>think it is lacking. Perhaps John Miles, KE5FX, who has experience
>with that sort of stuff will chime in.
>This CSAC device will shine in those areas where power and size really
>matter. If you read the supporting literature, a lot of
>computerization in the form of algorithms were required to tame the
>beast. All of that will improve over time. So this first to market
>item is interesting but let the big boys pay for it and down the road
>we mere commoners will reap the benefits.
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