Maximum TX frequency limit


#1

Hello, I found out that the max tx freq is limited in usrp_standard.cc
to 44MHz (since USE_FPGA_TX_CORDIC is undef’d). Now, since a 128MSps
should safely ensure 64MHz, what is actually imposing that limitation?

I was trying to go to 6mtrs ham band…

MC


#2

On Sat, Apr 15, 2006 at 02:00:00PM +0200, Matteo C. wrote:

Hello, I found out that the max tx freq is limited in usrp_standard.cc
to 44MHz (since USE_FPGA_TX_CORDIC is undef’d). Now, since a 128MSps
should safely ensure 64MHz, what is actually imposing that limitation?

It’s set by the passband of the interpolator in the AD9862. See the
datasheet for details.

I was trying to go to 6mtrs ham band…

Use a harmonic. You are going to want some filtering :wink:

Eric