Hi All,
I recently purchased a Wenzel 245MHz OCXO from ebay. It appears to work very well and shows good stability after 2 weeks on the bench. I would like to use it as the primary reference for a DDS 1st Lo in my homebrew HF transceiver. I have come to the conclusion the unit requires a very low noise 9 volt supply to ensure the phase noise is kept controlled around the spec. Although I am not able to measure phase noise, ensuring the unit is fed with a clean supply can only be good. I looked at the Wenzel Finesse approach, this article all makes sense and confirms my view the need for an exceptional low noise supply. I have noticed environmental changes/package temp stability is quite sensitive, the block is only 2" square therefore not a lot of mass, even handling the package shows drift +/- 5 to 10 Hz. I am thinking the best option is to box up the OCXO and low noise power supply in a Diecast box, insulated with Styrofoam to ensure external excessive temperature swings do not affect the package, however I am open to any suggestion. This is similar to the double skin 10811. I am not able to measure Phase Noise as per spec, I am looking for assistance from this group on the best method for measuring phase noise and stability using what equipment I do have in my Lab. I have a TDS2022B with FFT, HP 53131 and Tek492BP. My standard's reference is one of Tom's Thunderbolt with John's mods ( 10811 ) and a good quality linear power supply. Regards Gerald VK3GJM Gerald Molenkamp CTO - Director CommTel Network Solutions Pty Ltd 46 Ovata Drive. Tullamarine. Victoria. Australia. 3043 T. +613 9330 4722 / F. +613 9330 4277 / M. 0408 544 657 ServiceDesk. 1800 99 78 76 E. gera...@commtelns.com / W. www.commtelns.com
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