[Elecraft] K3 External Reference Option

[Trevor Smithers]

The recent announcement about development of an external reference option for the K3 is most 
welcome and will allow users to obtain the best calibration possible especially for digi modes like 
WSPR where 1Hz accuracy is required.

For anyone not quite sure about what it is, how to use it, or where to obtain the 10MHz external 
high stability signal here are a few links to get started. The two most popular 10MHz oscillators 
appear to be either GPS based (Trimble Thunderbolt) and Rubidium based (LPRO-101) both 
are easily obtained on Ebay. 

Set up and use the LPRO-101 units

http://kc.flex-radio.com/KnowledgebaseArticle50460.aspx

http://k9zw.wordpress.com/category/k9zw-built/

http://www.mentby.com/brian-lloyd/getting-a-rubidium-rb-reference.html

http://www.ka7oei.com/10meg_rubidium1.html

Setup and use of the Trimble Thunderbolt

http://www.vk4adc.com/gpsdo.php

http://www.prc68.com/I/ThunderBolt.shtml

http://trl.trimble.com/docushare/dsweb/Get/Document-10001/ThunderBoltBook2003.pdf

http://www.leapsecond.com/tbolt-faq.htm

http://www.leapsecond.com/pages/tapr-tbolt/

If you want to distribute the 10MHz signal to a number of instruments at the same time the TAPR 
TADD-1 kit might be of interest.
http://www.tapr.org/kits_tadd-1.html

73 Trevor  G0KTN