![]() "High tone" standard are used almost exclusively in the American continents (and many other areas). In the world of amateur radio digimodes use is made of the terms high tones and low tones. The decoder CF must equal the standard selected or provided. The receiver will produce tones based on recognised "standards". RTTY-Tune the receiver to the wanted frequency.The setting in the R75 is called CW Pitch in SET mode. CW-Tune the receiver to the wanted frequency.USB-Tune the receiver to the wanted frequency LESS the decoder CF.The CF is that frequency, in simple terms, below which incoming tones areĬonsidered as being MARK, and above which are considered SPACE (as per ITU Normal). ![]() The decoder may have a fixed or variable centre frequency (CF). To recap, the digi-monitor can employ three different modes in a receiver to produce audio tones to drive the decoder. Problem with this receiver in respect of the RTTY mode. Recent emails and some experiments with/by Patrice Privat have clarified and revealed what is considered a design Select RTTY shift between 170, 200 and 425 Hz. "RTTY mark frequency" can be selectedĪpparently this is also the center frequency. I admit that I don't understand the settings. Is it fixed at the usual (hi-tones) 2210Hz? If two options what is the BFO/CIO offset options for CW. Last year, in response to some correspondence on the ICOM R-75, Klaus Betke sent the following:ġ.
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