From 76d20580757b6242dd4d015e83892752f9b70e89 Mon Sep 17 00:00:00 2001
From: Jonathan Naylor <naylorjs@yahoo.com>
Date: Tue, 26 Jun 2018 18:16:13 +0100
Subject: [PATCH] Recalculate the TX delay for POCSAG.

---
 POCSAGTX.cpp | 10 +++++-----
 POCSAGTX.h   |  2 +-
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/POCSAGTX.cpp b/POCSAGTX.cpp
index 6a15e59..8306410 100644
--- a/POCSAGTX.cpp
+++ b/POCSAGTX.cpp
@@ -20,10 +20,10 @@
 #include "Globals.h"
 #include "POCSAGTX.h"
 
-const uint16_t POCSAG_PREAMBLE_LENGTH_BYTES = 576U / 8U;
-
 const uint16_t POCSAG_FRAME_LENGTH_BYTES = 17U * sizeof(uint32_t);
 
+const uint16_t POCSAG_PREAMBLE_LENGTH_BYTES = 18U * sizeof(uint32_t);
+
 const uint16_t POCSAG_RADIO_SYMBOL_LENGTH = 20U;
 
 const q15_t POCSAG_LEVEL1[] = { 1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700,  1700};
@@ -128,10 +128,10 @@ void CPOCSAGTX::writeByte(uint8_t c)
 
 void CPOCSAGTX::setTXDelay(uint8_t delay)
 {
-  m_txDelay = POCSAG_PREAMBLE_LENGTH_BYTES + uint16_t(delay);
+  m_txDelay = POCSAG_PREAMBLE_LENGTH_BYTES + (delay * 3U) / 2U;
 
-  if (m_txDelay > 1200U)
-    m_txDelay = 1200U;
+  if (m_txDelay > 150U)
+    m_txDelay = 150U;
 }
 
 uint8_t CPOCSAGTX::getSpace() const
diff --git a/POCSAGTX.h b/POCSAGTX.h
index e0b2d3a..ea41b7f 100644
--- a/POCSAGTX.h
+++ b/POCSAGTX.h
@@ -39,7 +39,7 @@ private:
   CSerialRB            m_buffer;
   arm_fir_instance_q15 m_modFilter;
   q15_t                m_modState[170U];     // NoTaps + BlockSize - 1, 6 + 160 - 1 plus some spare
-  uint8_t              m_poBuffer[1200U];
+  uint8_t              m_poBuffer[200U];
   uint16_t             m_poLen;
   uint16_t             m_poPtr;
   uint16_t             m_txDelay;