Radio fax transmissions are also broadcasted by NOAA from multiple sites in the country at regular daily schedules. Radio fax data is available from the web on sites such as the ones hosted by the National Oceanic and Atmospheric Administration (NOAA). Since the amount of information transmitted per unit time is directly proportional to the bandwidth available, then the speed at which a weather chart can be transmitted will vary depending on the quality of the media used for the transmission. Radio fax relies on facsimile technology where printed information is scanned line by line and encoded into an electrical signal which can then be transmitted via physical line or radio waves to remote locations. Radio transmission of weather charts provides an enormous amount of flexibility to marine and aviation users for they now have the latest weather information and forecasts at their fingertips to use in the planning of voyages. Prior to the advent of the commercial telephone line “fax” machine, it was known, more traditionally, by the term “radio facsimile”.įacsimile machines were used in the 1950s to transmit weather charts across the United States via land-lines first and then internationally via HF radio. It was the predecessor to slow-scan television (SSTV). WEFAX is an analog mode for transmitting monochrome images. Expect typographical mistakes, inaccuracies, or omissions. This is only a collection of information that I have found scatter throughout the internet and re-compiled into a document, this document. This document is not a definitive guide to the WEFAX protocol, the process of decoding WEFAX images or reading a synoptic weather chart. (some text taken and edited from various website) The pair will internally link Black Cat Weather Fax decoder to SDRuno’s using UnoUDP as the transport protocol. A virtual com port emulator allows you to create a virtual com port.
Either one of these applications will work. This is done over a virtual com port pair using a virtual com port emulator.
UnoUDP allows you control SDRuno’s VFO frequency from within Black Cat HF Weather Fax scheduler. Transfers audio, digitally from one application (SDRuno) to another (Black Cat HF weather Fax) with zero loss.īlack Cat HF Weather Fax (paid for use) beta 19ĭecodes and produces images from the WEFAX transmissions from the output of SDRuno using a virtual audio cable.
SDRuno is an advanced Software Defined Radio application platform which is optimized for use with SDRplay’s range of Radio Spectrum Processing receivers. It’s all about the SNR, not your S-meter reading. Any good antenna placed outdoors should be fine. In an Inverted delta loop configuration pointed N/E-S/W. Any model RSP’s can tune WEFAX transmissions. RSPduo from SDRplay using the Hi-Z input. Many thanks to SWLing Post contributor, Mike Ladd with SDRplay, who shares the following guest post:īasics to decoding WEFAX using an RSP and SDRuno
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