I use the UDP interface to integrate WSJT-X (FT8) into my logging software which makes a quick decision whether to call a CQing station based on rules implemented in the logging software. However the inability to set TX audio offset leads to a high risk of causing interference to other stations:
* If ‘Hold TX Frequency’ isn’t checked in WSJT-X, then the CQing station is called on his frequency. If he is already interleaving that frequency with another station then there is a risk of interference. * If ‘Hold TX Frequency’ is checked, to avoid interference it is necessary to check that the transmit offset frequency last used by my station is still clear in the period that I wish to use it – that requires bringing WSJT-X back into focus and a visual inspection, which is time consuming. * There is an additional issue in the UK on 60m, where the unofficial FT8 frequency is 5.356MHz to 5.358MHz. The top end of that particular UK sub-band is 5.358MHz, so care has to be taken not to use a TX audio offset above 2.0 KHz. To avoid possible interference I’d like to suggest the ability to set TX audio offset through the UDP interface. Possibly through an additional UDP message, or use of the ‘Delta Frequency’ parameter in the ‘Reply’ message – unless of course that is used for some other purpose. The logging software could then keep a map (built from previous decodes) of clear frequencies and select a new one if necessary. I don’t think this would compromise the ’useful co-operative service’ concept of the UDP interface. I’d be pleased to learn of any existing ways to achieve the functionality I’m looking for within the current WSJT-X implementation. Many thanks & 73 Mike /G3WPH
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