[hpsdr] Level calculation error in Two Tone Test generation routine

[Helmut]

It seems to be a never ending story:  PEP output power means the effective
power at the top of the envelope. If only 1 tone is applied to the amp, PEP
= CW and a proper method to determine the transfer characteristic of an amp.
For correct operation the user should know the important markers like 1dB
compression point or 3 dB saturation (except you’re using PS, hi)
For multi-tone drive is valid: PEP = 1/RL (U1eff + U2eff +
.+Uneff)*2
This means for IM check: 2 tone : each carrier 6dB down; 3 tone each carrier
9,5 dB down. BTW you can measure the correct adjustment on your panadapter
comparing ‘tune signal’ and 2 tone signal at the same drive position. The
two test carriers are 6 dB down and fully complying with the A2204B or even
EIA standard for IM determination.

73, Helmut, DC6NY

-----Ursprüngliche Nachricht-----
Von: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Simon
Brown
Gesendet: Mittwoch, 23. November 2016 07:30
An: hpsdr at lists.openhpsdr.org
Betreff: Re: [hpsdr] Level calculation error in Two Tone Test generation
routine

***** High Performance Software Defined Radio Discussion List *****

Warren,

You are indeed spot-on.

Simon Brown, GK4ELI
http://sdr-radio.com

-----Original Message-----
From: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of Warren
C. Pratt
Sent: 23 November 2016 04:52
To: hpsdr at lists.openhpsdr.org
Subject: Re: [hpsdr] Level calculation error in Two Tone Test generation
routine

***** High Performance Software Defined Radio Discussion List *****


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