I was one of the beta testers on the K3EXREF. I am using a surplus OCXO bought for about $45 on e-bay. Its output was a distorted sinewave (appears to have strong second harmonic). I removed the harmonic by running the 10-MHz thru a DEMI model 10-4 distribution amp that uses 10-MHz bandpass filters on each of the four outputs (which are 10 dBm). The K3EXREF runs very nicely with this.
Refer to:  http://www.kl7uw.com/K3EXREF.htm

73, Ed - KL7UW
http://www.kl7uw.com
    "Kits made by KL7UW"
Dubus Mag business:
    dubus...@gmail.com

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