[hpsdr] TX IMD

Helmut, DC6NY dc6ny at gmx.de
Fri Jan 18 23:59:16 PST 2013

Hi Frank,


completely agreed.  What you mention is not only a Mil Method, it's  a
commercial standard in IMD evaluation e.g. for base stations in mobile
networks where linearity is even more important than in our ssb application.
The 6 dB PEP bonus is not more than an advertising trap.


73, Helmut


Von: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von FRANCIS CARCIA
Gesendet: Samstag, 19. Januar 2013 00:10
An: hpsdr at lists.openhpsdr.org
Betreff: [hpsdr] TX IMD


When you look at a signal on Hermes and Mercury and see IMD distortion it is
X dB down. What you see is the real number. 

I don't agree with the commercial method claiming another 6dB for PEP. The
distortion should also get another 6dB in my view so you end up with the
same number. The Mil Method checks IMD at 6dB below max power (3dB on an
average power meter) Then  the IMD is the difference between IMD and carrier
peak on the display. 

Funky specs are for rice boxes.....Frank WA1GFZ

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