G’day
I am sure I am not the only one who has noticed that the new KPA 1500 has a connector on its rear panel labelled ‘TX Sample’. Reading the Elecraft FAQ on the KPA 1500, it says that this “provides a low level KPA 1500 TX RF signal for sampling use by transceivers that support closed-loop pre-distortion techniques, e.g. Pure Signal. This low-level signal is taken directly from the amplifier’s directional coupler.”
For those on this reflector who are not familiar with ‘Pure Signal’, it is the name given to “the theory and implementation of the clean transmission logic developed by the OpenHPSDR team and implemented in PowerSDR [softwar as used with the ANAN radios” (see SDR-Radio.com -
http://sdr-radio.com/Version-3/Transmit/Pure-Signal).
Using pre-distortion, Pure Signal means that transmit IM3 can be improved significantly – up to 20dB from memory.
Now Pure Signal is an SDR technique and many amateurs have been wondering when Elecraft is going to finally take a leap beyond the KX3 into digital down conversion/up conversion SDR or even the latest Direct Fourier Conversion SDR?
Looks to me perhaps that the leap is not far off – unless Elecraft are seeing a big market for ANAN SDR owners buying the KPA 1500 (which, incidentally looks fabulous)? ;-)
What say you, Wayne N6KR?
Vy 73
Steve, VK6VZ
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