![]() 17 of these gpio lines can be used for things like push-to-talk. It has a array of General Purpose Input Output, gpio, lines of a 40 pin in-line header. The Pi series of miniature computers offer a large array of possibilities for controlling devices. This will cause the RED PTT led to flash and the transceiver PTT to toggle on and off. Pressing the TEST button will cause the PTT line to rapidly toggle for a period of 2 seconds. You must test the selected interface as it is not possible to know which is the correct one for the DRA interface. If multiple C-Media devices are discovered they will enumerate as C-Media-A, C-Media-B, etc. The PTT type, the device and the GPIO line must be selected. ![]() The circuitry was designed to operate correctly no matter if the Heartbeat has stuck in the on or off state. This will occur if fldigi and similar modem program is not reading/writing audio data. This function will kill the PTT line the audio stream is interrupted. The PTT line on any DRA Series radio adapter is interrupted with the failure of this health status. The Blue LED indicates the health status of the system, and illuminates when everything is okay. If the HB LED stops flashing because the radio adapter or the computer/appliance has failed, or the software has stopped reading or writing audio data, the Blue COMM OK LED goes out. If everything is okay, (HB LED is flashing) a Blue LED called "COMM OK" illuminates. When the Cmedia device is reading or writing audio data, the HeartBeat status LED (HB) flashing. All DRA Series radio adapters include a Heartbeat Monitor. GPIO-3 is used to drive a fully buffered and deadman protected PTT circuit. The Cmedia device supports 4 unbuffered input/output lines, GPIO-1. The DRA-Series digital radio adapter is used for Packet Radio or other digital programs and applications like VARA-FM, VARA-HF, SoundModem or fldigi.Īll RA Series radio adapters include GPIO support. The DRA is a radio optimized sound card used to connect a two-way radio to a computer for digital communications. It is also used in the series of sound card adapters. Cmedia audio codec chips are used in a number of inexpensive USB audio thumbnail devices. FEC of previous mode too heavy for some CPUs Requires Signalink made-after 2018 connected to the 9600-jack 2/3 rate K=13 FEC with 3.2sec interleaver 1/2 rate K=13 FEC with 3.2sec interleaver 1/2 rate K=15 FEC with 4sec interleaver * fix for pi3/4 gpio h/w UDRC-II operation * modify edit code to maintain cursor position * correction to xmlrpc procedure to get smeter and power out meter from flrig This seems to result in slightly better message decoding in marginal Make the bit flip guessing a little smarter by correcting towards theģ/4 framing, but only if this character is only one off from a valid The space value, even when both are the exact same signal level! The mark value consistently getting a lower envelope estimation than SITOR-B, where every character has 3 marks and 4 spaces, resulting in However, in the face of selective fading and QRM, the assumption of With the smallest absolute value is likely to get us what might have been Likely to get things wrong in each direction, and that flipping the bit The flip_smallest_bit code was written with the assumption that theĭiscriminator has equal weights for mark and space, that we are equally * make single bit flip correction guess a little smarter * adjust tracking filter constants to improve power detection * Fix cosmetic issues reported by Bob, VK2YQA * Update release to both fldigi and flarq Download the latest version of Fldigi here. As with all of the FL suite, Flrig supports PowerPC, Intel (i386) and Apple Silicon (M1) processors with individual downloads available for each architecture. It can help calibrate a sound card to a time signal and do frequency measurement tests. The development team led by W1HKJ have announced the release of Fldigi v4.1.20.įldigi is a modem program for most of the digital modes used by radio amateurs today: CW, PSK, MFSK, RTTY, Hell, DominoEX, Olivia, and Throb are all supported.
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