Re: QRPGuys DSB Digital Transceiver
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That's an interesting take on the issue, but I'm not sure I agree.
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As far as I know there's no FCC (for USA hams, anyway) rule against transmitting digimodes in DSB (or AM, FM, or ISB). It's not common, but I doubt it's "illegal." Short of its collective lobbying and WARC activities, the IARU has only an advisory role in anything it does (when it comes to the regulations of individual countries), so until and unless the IARU encourages individual countries to adopt specific emission rules, it doesn't seem to be an issue. Until I discovered specific prohibitions, I'd transmit digimodes in DSB without worrying -- as long as I wasn't aiming for intentional interference, and as long as I was using QRPish power levels. I think unattended digimode (FTx) bots and unattended WSPR operation are much more problematic, as are unattended PACTOR/Winlink stations in general. Just my opinion. Regards, --Kirk, NT0Z? Rochester, MN My book, "Stealth Amateur Radio," is now available from www.stealthamateur.com and on the Amazon Kindle (soon) On Saturday, October 26, 2019, 7:03:06 PM CDT, Christos SV1EIA via Groups.Io <sv1eia@...> wrote:
Using DSB modulation to Tx a FT8 signal means that you will end up transmitting a second FT8 signal a few KHz away from your intended one. From what I understand, this will have legal issues also with FCC, it will not be characterized as a 'spurious' but it will certainly be characterized as a 'Out of Band' (OoB) whereas a different method of what is legal or not applies than in the case of spurious, but will definitively be IMHO falling into the non-legal. Of course based on IARU's determination of what signals should be used in the digital segments, it is obvious that this is not allowed as all digimodes are mainly narrowband. 73, Christos SV1EIA |
Kirk, NT0Z