UHD: moving HF apps from gnuradio-examples to gr-uhd/examples. Did the minimum possible work to convert HF Explorer to use UHD.

1 files changed, 48 insertions, 0 deletions

diff --git a/gr-uhd/apps/hf_radio/ssbagc.py b/gr-uhd/apps/hf_radio/ssbagc.py
new file mode 100644
index 000000000..fdf40bc6b
--- /dev/null
+++ b/gr-uhd/apps/hf_radio/ssbagc.py
@@ -0,0 +1,48 @@
+# post detection agc processing
+#
+# Imagine that the usual gnuradio copyright stuff is right here.
+#
+# This agc strategy is copied more or less verbatim from
+# weaver_isb_am1_usrp3.py by cswiger.
+#
+# Thanks.
+#
+# Then modified in a variety of ways.
+#
+# There doesn't appear to be a way to hook multiple blocks to the
+# input port when building a hier block like this. Thus the
+# split below.
+#
+# Basic operation.
+# Power is estimated by squaring the input.
+# Low pass filter using a 1 pole iir.
+# The time constant can be tweaked by changing the taps.
+# Currently there is no implementation to change this while operating
+#   a potentially useful addition.
+# The log block turns this into dB
+# gain adjusts the agc authority.
+#
+# M. Revnell 2006-Jan
+
+from gnuradio import gr, gru
+
+class agc( gr.hier_block ):
+    def __init__( self, fg ):
+        self.split = gr.multiply_const_ff( 1 )
+        self.sqr   = gr.multiply_ff( )
+        self.int0  = gr.iir_filter_ffd( [.004, 0], [0, .999] )
+        self.offs  = gr.add_const_ff( -30 )
+        self.gain  = gr.multiply_const_ff( 70 )
+        self.log   = gr.nlog10_ff( 10, 1 )
+        self.agc   = gr.divide_ff( )
+
+        fg.connect(   self.split,        ( self.agc,   0 ) )
+        fg.connect(   self.split,        ( self.sqr,   0 ) )
+        fg.connect(   self.split,        ( self.sqr,   1 ) )
+        fg.connect(   self.sqr,            self.int0       )
+        fg.connect(   self.int0,           self.log        )
+        fg.connect(   self.log,            self.offs       )
+        fg.connect(   self.offs,           self.gain       )
+        fg.connect(   self.gain,         ( self.agc,   1 ) )
+
+        gr.hier_block.__init__( self, fg, self.split, self.agc )