From a7a3532e1b893594ab8d6cc3aaf0e5b367ee7506 Mon Sep 17 00:00:00 2001
From: theshaun <shaun@theshaun.com>
Date: Sun, 1 Feb 2026 13:51:50 +1000
Subject: [PATCH] Slight refactor as bw_khz isnt really reused.

This resolves airtime issue if SF is 11 or higher
---
 repeater/airtime.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/repeater/airtime.py b/repeater/airtime.py
index 8977489..b1f0040 100644
--- a/repeater/airtime.py
+++ b/repeater/airtime.py
@@ -54,7 +54,6 @@ class AirtimeManager:
         """
         sf = spreading_factor or self.spreading_factor
         bw_hz = (bandwidth_hz or self.bandwidth)
-        bw_khz = bw_hz / 1000
         cr = coding_rate or self.coding_rate
         preamble_len = preamble_len or self.preamble_length
         crc = 1 if crc_enabled else 0
@@ -64,7 +63,7 @@ class AirtimeManager:
         de = 1 if (sf >= 11 and bw_hz <= 125000) else 0
         
         # Symbol time in milliseconds: T_sym = 2^SF / BW_kHz
-        t_sym = (2 ** sf) / bw_khz
+        t_sym = (2 ** sf) / (bw_hz / 1000)
         
         # Preamble time: T_preamble = (n_preamble + 4.25) * T_sym
         t_preamble = (preamble_len + 4.25) * t_sym