From 478d2cba70e2f07c46ee4d200b32e5a434ed7de4 Mon Sep 17 00:00:00 2001
From: Max <ikj1234i@yahoo.com>
Date: Sun, 2 Aug 2020 15:49:05 -0400
Subject: fakecc updates

---
 op25/gr-op25_repeater/apps/tx/README-fakecc.txt | 31 +++++++++++++++++++++++++
 op25/gr-op25_repeater/apps/tx/generate-tsbks.py |  6 ++++-
 op25/gr-op25_repeater/apps/tx/p25craft.py       | 12 +++++-----
 3 files changed, 42 insertions(+), 7 deletions(-)
 create mode 100644 op25/gr-op25_repeater/apps/tx/README-fakecc.txt

diff --git a/op25/gr-op25_repeater/apps/tx/README-fakecc.txt b/op25/gr-op25_repeater/apps/tx/README-fakecc.txt
new file mode 100644
index 0000000..4d629ce
--- /dev/null
+++ b/op25/gr-op25_repeater/apps/tx/README-fakecc.txt
@@ -0,0 +1,31 @@
+
+Generating and transmitting a fake trunking control channel
+===========================================================
+
+1. After editing, run generate-tsbks.py which should generate
+a file named "p25.out".
+
+2. The tool generates the file packed form; it must be unpacked
+       ./unpack.py -i p25.out -o sym-cc925.dat
+
+3. The unpacked file must be referenced in the json cfg file:
+              .
+              .
+              .
+      "source": "symbols:sym-cc925.dat",
+              .
+              .
+              .
+
+NOTE: in generate_tsbks.py, keys starting with "iden_up"
+are used to define a channel band plan with bandwidth(bw),
+channel spacing, and starting frequency in Hz; TX offset is in 
+MHz.
+
+NOTE: with rx.py and multi_tx.py in tandem using the udp option,
+the center frequency must be set in the rx.py trunking TSV
+file equal to the device frequency in the multi_tx config.
+
+As always, the control channel and voice channel frequencies
+must fall inside the band defined by the center freqency and 
+sampling rate.
diff --git a/op25/gr-op25_repeater/apps/tx/generate-tsbks.py b/op25/gr-op25_repeater/apps/tx/generate-tsbks.py
index f3c80ed..f4b06d9 100755
--- a/op25/gr-op25_repeater/apps/tx/generate-tsbks.py
+++ b/op25/gr-op25_repeater/apps/tx/generate-tsbks.py
@@ -12,5 +12,9 @@ if __name__ == '__main__':
 		'vc_freq': 924900000,
 		'nac': 0x293,
 		'subsystem_id': 1,
-		'site_id': 1}
+		'site_id': 1,
+		'iden_up_bw' : 12500,
+		'iden_up_tx_offset' : 25,	# MHz
+		'iden_up_spacing' : 12500,
+		'iden_up_frequency' : 902012500}
 	make_fakecc_tsdu(params)
diff --git a/op25/gr-op25_repeater/apps/tx/p25craft.py b/op25/gr-op25_repeater/apps/tx/p25craft.py
index dd0f0c9..7fae739 100755
--- a/op25/gr-op25_repeater/apps/tx/p25craft.py
+++ b/op25/gr-op25_repeater/apps/tx/p25craft.py
@@ -1694,17 +1694,17 @@ def make_fakecc_tsdu(params):
 	opcodes = []
 	args = []
 	op, arg = format_iden_up(0,
-		int(12.5 / 0.125),
-		(25 * 4),
-		int(12.5 / 0.125),
-		902012500/5)
+		params['iden_up_bw'] // 125,
+		params['iden_up_tx_offset'] * 4,
+		params['iden_up_spacing'] // 125,
+		params['iden_up_frequency'] // 5)
 	opcodes.append(op)
 	args.append(arg)
 	op, arg = format_network_status_broadcast(
 		0,
 		params['wacn'],
 		params['system_id'],
-		(params['cc_freq'] - 902012500) / 12500,
+		(params['cc_freq'] - params['iden_up_frequency']) // params['iden_up_spacing'],
 		0x70)
 	opcodes.append(op)
 	args.append(arg)
@@ -1713,7 +1713,7 @@ def make_fakecc_tsdu(params):
 		params['system_id'],
 		params['subsystem_id'],
 		params['site_id'],
-		(params['cc_freq'] - 902012500) / 12500,
+		(params['cc_freq'] - params['iden_up_frequency']) // params['iden_up_spacing'],
 		0x70)
 	opcodes.append(op)
 	args.append(arg)
-- 
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