Re: HF Beacon Frequencies « Reply #2 on: August 16, 2021, 1557 UTC » I'm thinking "Clear frequencies" would be my first choice and after that, most likely, "there are other beacons near this freq, I'll put one up close by" or something like that.? Quote from: Heathkit o...
In one of his latest videos Matt from the Tech Minds YouTube channel tests out the RX888 MK2 software defined radio at HF frequencies. Matt notes that while the bandwidth of this SDR is limited to 10 MHz at VHF/UHF, you can actually use it in direct sampling mode to achieve a massive...
See the Citizens Band page for frequencies and channels REACT Short Wave Broadcast SWL Broadcast Pirates and Clandestines Utility Monitoring Utility Monitoring Utility Topics ALE COTHEN Federal Aviation Administration HF Aeronautical Communications HF Digital Decoding HF Maritime Communications HF Military Commun...
ALE or Automatic Link Establishment is a digital RF protocol that enables users to initiate a reliable call over HF frequencies, by automatically choosing the best frequency based on propagation conditions, allowing for telephone like calling operation, and enabling short text messages. GMDSS or Global...
Usually this is done in response to abusive users, who will sit on a particular frequency for hours on end, tying up the receiver and preventing others from using it.I've had to do it on a few frequencies, myself. Logged Chris SmolinskiWestminster, MDeQSLs appreciated! csmolinski@...
The second operation that the Whisper feature extractor performs is converting the padded audio arrays to log-Mel spectrograms. These spectrograms are a visual representation of the frequencies of a signal, rather like a Fourier transform. An example spectrogram is shown in Figure 2...
These spectrograms are a visual representation of the frequencies of a signal, rather like a Fourier transform. An example spectrogram is shown in Figure 2. Along the \(y\)-axis are the Mel channels, which correspond to particular frequency bins. Along the \(x\)-axis is ti...
This chapter describes how ALE systems select the best frequency by making use of recently measured radio channel characteristics stored in a memory matrix and by constantly scanning through assigned frequencies to listen for calls. System limitations are also discussed. Chapter III discusses common ...
However, we are likely to be sailing or off the boat at this time of day. The two useable frequencies in the Mediterranean for Programme 2 are 11039 and 14467.3 and both are low power (1 kW). For obvious domestic reasons, I like to receive the broadcasts at 0415 or 0535 UTC but,...
The µBITX has a sparklingly clear receiver. A roofing filter at 45 MHz and an 11.059 MHz QER SSB filter with a whopping 8 crystals. Powered by the Si5351, it gives you rock stable performance at all frequencies. Work that PSK31 or FT8 pile up or just ragchew the local gang. ...