In PowerSDR release 3.2.25 Warren has introduced a sophisticated new “Automatic Tx
Attenuation” adjustment.
This was previously done manually by the operator using Setup ---> General ---> Ant/Filt and
adjusting the thumb wheel value of ATT on TX [as shown below) while watching for a GREEN
Feedback Level in the Linearization window indicating that you have sufficient feedback RF signal for
PureSignal to measure, evaluate, and correct with Adaptive Distortion techniques in the DAC Tx signal.
With the new automatic adjustment feature, Warren has dramatically improved PureSignal so that it is
now even easier to use on a routine basis.
Using a DUMMY LOAD and your Panadapter set for DUP, you can activate the TWO TONE button in the
PureSignal Window. You should immediately see your transmitted signal displayed with the primary and odd
harmonic peaks. PureSignal will adjust your ATT on Tx for an optimal value and then in just a few seconds it will
lower your 3
rd
,5
th
,7
th
harmonic peaks to a surprisingly lower level. PureSignal can optimally adjust unwanted
IMD by as much as -45dbc. PureSignal will continue to optimize your signal as you speak in a normal voice.
Users who have a Linear Amplifiers properly equipped with an RF Signal Sampler will see a similar improvement
in the quality of their transmitted two tone signal to the extent that PowerSDR can make mathematical
adjustments for distortion introduced by the Linear Amplifier.
For more information about suitable couplers from the KC9XG Yahoo Group Files section:
https://xa.yimg.com/df/KC9XG-SDR/PSSamplersCouplers.pdf
Various directional coupler models are available
ac2iqdave@gmail.com
http://www.elecraft.com
http://www.wavenode.com
http://www.cleanrf.com
Copyright Apache Labs © ANAN-200D 43 June 22, 2015
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