From f4d8c8a06e49f7ce303da70ac57dbcb2b2c1dc12 Mon Sep 17 00:00:00 2001 From: Roman Zeyde Date: Wed, 3 Dec 2014 09:58:47 +0200 Subject: [PATCH] README: add note regarding bitrate selection. --- README.md | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/README.md b/README.md index 05d09c5..7a76409 100644 --- a/README.md +++ b/README.md @@ -67,6 +67,7 @@ For graphs and visualization (optional), install: Run: + $ export BITRATE=48 # explicitly select highest MODEM bit rate (assuming good SNR). $ amodem-cli -h usage: amodem-cli [-h] [-v | -q] {send,recv} ... @@ -90,14 +91,18 @@ following scripts: - On the sender's side: ``` +~/sender $ export BITRATE=48 # explicitly select highest MODEM bit rate (assuming good SNR). ~/sender $ amodem-cli send --calibrate ``` - On the receiver's side: ``` +~/receiver $ export BITRATE=48 # explicitly select highest MODEM bit rate (assuming good SNR). ~/receiver $ amodem-cli recv --calibrate ``` +If BITRATE is not set, the MODEM will use 1 kbps settings (single frequency with BPSK modulation). + Change the sender computer's output audio level, until all frequencies are received well: ```