Using an external clock with the RFX 900

GNU Radio
1

Hi there,

I’ve got a USRP v4 board that I’m planning to run off of a 13Mhz
external clock. I know how to modify the hardware and software
accordingly. (I hope.)

However, I’m intending to use a pair of RFX 900 daughterboards, and
I’m wondering if there are any known mods needed to allow these
daughterboards to operate with a 13Mhz clock?

Thanks,

Harvind

2

Harvind Samra wrote:

Hi there,

I’ve got a USRP v4 board that I’m planning to run off of a 13Mhz
external clock. I know how to modify the hardware and software
accordingly. (I hope.)

However, I’m intending to use a pair of RFX 900 daughterboards, and
I’m wondering if there are any known mods needed to allow these
daughterboards to operate with a 13Mhz clock?

You need to go into the db_flexrf.py and db_flexrf_mimo.py files in the
gr-usrp/src directory. Any references to 64 MHz need to be changed to
13 MHz. You also need to make sure that you tell the usrp object what
its sampling rate is.

Matt