From 2b76d142ba5b4830d8cb090eedbb89c7a6a09659 Mon Sep 17 00:00:00 2001
From: Eric Kooistra <kooistra@astron.nl>
Date: Mon, 21 Nov 2022 17:04:09 +0100
Subject: [PATCH] Clarified spectral inversion.

---
 libraries/dsp/si/src/python/si.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libraries/dsp/si/src/python/si.py b/libraries/dsp/si/src/python/si.py
index 27f77be077..3ba02f4000 100755
--- a/libraries/dsp/si/src/python/si.py
+++ b/libraries/dsp/si/src/python/si.py
@@ -36,6 +36,8 @@
 #     1st Nyquist zone: f =   0 - 100 MHz
 #     2nd Nyquist zone: f = 100 - 200 MHz
 #     3rd Nyquist zone: f = 200 - 300 MHz
+#   Spectral inversion flips the frequency bands (Nyquist zones), it does not
+#   shift frequencies.
 
 import argparse
 import textwrap
-- 
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