Forum: GNU Radio Maximum TX frequency limit

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635b8cf1ca106f565815ca16ccc438ae?d=identicon&s=25 Matteo Campanella (Guest)
on 2006-04-15 14:02
(Received via mailing list)
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
745d8202ef5a58c1058d0e5395a78f9c?d=identicon&s=25 Eric Blossom (Guest)
on 2006-04-15 22:09
(Received via mailing list)
On Sat, Apr 15, 2006 at 02:00:00PM +0200, Matteo Campanella 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 ;)

Eric
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