[time-nuts] Reference source 1E10^8 only ...Ideas

Steve Rooke sar10538 at gmail.com
Sat Jul 24 09:07:41 EDT 2010


Don,

A GPSDO would suit you fine, perhaps a Thunderbolt as that seems to be
well know and respected here, and is a relatively inexpensive way to
get a GPS disciplined oscillator. There is plenty of coverage of sats
in NZ, I'm in Christchurch and daily track up to 12 on a Z3805A at any
one time.

You could always buy your own used Rb oscillator, like an LPRO, as
these are easily available on fleeBay from sellers like Bob Mokia
(fluke.l) but you would need something to calibrate it with in the
first place (possibly someone else's standard). These are used Rb
units and have had their planned life already but the telecom's
providers that have used them have generally bargained on a reasonable
safety margin so you are likely to get a few more years out of them
depending on the duty cycle you are using them.

Steve

On 25/07/2010, Don Collie jnr <nccollie at vodafone.co.nz> wrote:
> I need a frequency reference for my frequency counters, it needs to be
> accurate to at least +or- 1 part in 10,000,000.
> !0MHz would be OK, but also 5, or 1. Due to technical "improvements", the
> 4.43361875 MHz colour subcarrier which is available on the analogue TV
> system here in New Zealand, is no longer referenced to a Rubidium standard,
> and can be about +,- 1Hz in error. I have a communications receiver, and
> have been thinking of using this with Lyssajous
> figures on an oscilloscope, with the receiver tuned to WWVH in Hawaii, but a
> GPS might be a possability, if there is satellite coverage here in
> Invercargill, southern NZ. Bearing in mind I don`t need extreme accuracy,
> what is my best option,
> please?.................................................Don.
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-- 
Steve Rooke - ZL3TUV & G8KVD
The only reason for time is so that everything doesn't happen at once.
- Einstein




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