Re: [Discuss-gnuradio] changing the vctcxo

[Roshan Baliga]

Hans Glitsch wrote:
> I want to change the clock on the usrp.  Anyone know of a mail order 
> place that would have the right kind of vctcxo at 38.4MHz ?  I tried 
> Digikey and Mouser. no luck.

Based on the common frequency table here:

http://www.cardinalxtal.com/common-frequencies.htm

it doesn't look like it's going to be easy to find a 38.4 MHz vctcxo.

I just spent a decent amount of time looking for more stable clocks to 
replace the onboard TCXO. I found that unless you're willing to order a 
custom TCXO/OCXO (which is expensive and takes a long time), your best 
bet is to choose a frequency which is common, and then use one of those 
TCXOs. That way, you get the quantity advantage. For example, a 13 MHz 
GPS TCXO that's 0.5 ppm can cost well under $10. (Also, don't forget you 
can multiply the clock up, either using a discrete IC, or some transistors.)

-Roshan