[Elecraft] Cheap ref osc to lock K3

[Matt Maguire]

I bought a module like that. If you set the output frequency to something that divides evenly into 48MHz, then the output is quite stable. Otherwise, if you set it to something else like 10MHz, the jitter is quite obvious on the scope. It is fine for jobs like calibrating a frequency counter or zero-beating a transceiver. You'd probably want to smooth out the jitter though if you want to use it for a K3 reference oscillator.
73, Matt VK2RQ

Envoyé à partir d'Outlook




On Sat, Oct 3, 2015 at 8:19 AM -0700, "brian" <alsopb at nc.rr.com> wrote:










LA3ZA used a UBLOX NEO-7 GPS unit to lock his K3.
This $20 unit including complete development board can be obtained here.
http://www.ebay.co.uk/itm/301199083821

It's tiny, has a patch antenna (although a $10 active antenna works 
better) and consumes under 60ma.
It can be powered from +5v or a USB port.  It fits in a 2"x3" box. Once 
set up it is stand alone not requiring a computer connection.

There was some question as to whether the jitter of the unit would 
disqualify it as a decent ref osc.

A posting on the SpectrumLab group indicated that it seems quite 
adequate for K3 disciplining.
SpectrumLabUsers at yahoogroups.com

Accuracy within 0.02 to 0.03 Hz of a Rb standard.
Output spectrum seems to indicate that jitter is not a problem for this 
purpose.

73 de Brian/K3KO

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