Rrc_filter in generic_mod_demod

GNU Radio
1

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4

Dan, Any chance you can attach those pictures in a different way and
resend, I couldn’t find a way to view them and I’m curious to see them.
-Ian

5

Sure. Sorry.

Very Respectfully,

Dan CaJacob

6

I think you mean from the curve that for tx-amplitude as 0.2 and then
increasing gain gives you the most linear output compared to all other
amplitudes . Am I right?

7

On 06/12/2013 12:42 PM, Dan CaJacob wrote:

Very Respectfully,

Dan CaJacob

HiDan,

Did you perform any measurements of amplitude and/or gain across the
freq range of the board? I’d expect it to vary somewhat since it’s such
a wideband board, but it’d be interesting to learn the relationship.

Thanks,
Sean

8

I think the range across which you have acceptable linearity may be
somewhat related to the type of signal you are using. The general
recommendation in the past has been to stick below 0.2 The graphs show
that you only lose about 7 dBm of total possible power by backing off
the
digital amplitude to 0.2 max and you get a linear 1 dBm power output
increase for every 1 dB gain increase across the entire gain range of
the
WBX.

By they, it is a bit unrelated, but I also measured -119 dBm for 12 dB
SINAD on the RX side with an 8920A specan.

Very Respectfully,

Dan CaJacob