From 402c01743570e343c0add63c2d10edbb398a8ab6 Mon Sep 17 00:00:00 2001 From: Bryan Biedenkapp Date: Thu, 9 Feb 2023 16:13:51 -0500 Subject: [PATCH] update README.md; --- README.md | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/README.md b/README.md index b9b7dd19..c6069085 100644 --- a/README.md +++ b/README.md @@ -89,6 +89,24 @@ M: ... (HOST) Channel Id 2: BaseFrequency = 450000000Hz, TXOffsetMhz = 5.000000M * During Transmit Calibration, it may be necessary to adjust the symbol levels directly. Normally this isn't required as the DVM will just work, but some radios require some fine adjustment of the symbol levels, this is exposed in the calibration mode. * Unusually high BER >10% and other various receive problems may be due to the radio/hotspot being off frequency and requiring some adjustment. Even a slight frequency drift can be catastrophic for proper digital modulation. The recommendation is to ensure the interfaced radio does not have an overall reference frequency drift > +/- 150hz. An unusually high BER can also be explained by DC level offsets in the signal paths, or issues with the FM deviation levels on the interfaced radio being too high or too low. +## Command Line Parameters + +```usage: ./dvmhost [-vh] [-f] [--cal] [--setup] [-c ] [--remote [-a
] [-p ]] + + -f foreground mode + --cal calibration mode + --setup setup mode + + -c specifies the configuration file to use + + --remote remote modem mode + -a remote modem command address + -p remote modem command port + + -v show version information + -h show this screen + -- stop handling options``` + ## Notes Some extra notes for those who are using the Raspberry Pi, default Raspbian OS or Debian OS installations. You will not be able to flash or access the STM32 modem unless you do some things beforehand.