Hi Mike, Please don’t mix AM at all with e.g. Q65 that are using frequency-shift keying and don’t have any amplitude modulation. In most rigs the 25 W versus 100 W is due to keep amplitude modulation in PA linear range. As such it is not due to possible high temperature rise. Your 25 W rule is on safe side for 300 s Q65 as it starts to be same as continuous transmission in most rigs.
73, Reino OH3mA From: Black Michael via wsjt-devel [mailto:wsjt-devel@lists.sourceforge.net] Sent: 3. helmikuuta 2021 23:28 To: wsjt-devel@lists.sourceforge.net Cc: Black Michael <mdblac...@yahoo.com> Subject: Re: [wsjt-devel] 2.4.0 RC1 - Decodes show no callsign I will add that many operators aren't aware that their rig can't do full power on all modes. Many rigs rated at 100W can only do 25W in AM mode (100% duty cycle) -- the manuals do show this. For those rigs I always recommend to the ops to run FT8 at 50W max to avoid pushing the temperature on their rig's finals. So a 300 seconds Q65 would definitely be 100% duty cycle and a max of 25W or whatever your manual says is the AM maximum power level. Mike W9MDB On Wednesday, February 3, 2021, 03:20:48 PM CST, Bill Somerville <g4...@classdesign.com <mailto:g4...@classdesign.com> > wrote: On 03/02/2021 21:02, Edfel Rivera wrote: > Hi: > Please see attachment. Seems to be decoding or the functionality is > correct. Also, what TX power could be used? As TX intervals increase, > Could that cause damage to rig terminals? Thinking of JT65 where TX > power < ~30watts. > > BTW, Thank you very much for INNOVATION. Seems like another fantastic > mode. > > 73' > > Edfel > KP4AJ Hi Edfel, the lines in the Single-Period Decodes window without decodes indicate the best, but not decodable, candidate signal within the current frequency tolerance window. They may provide indication that a station is transmitting. As for Tx power, nothing new there, use whatever is needed to make the QSO and not more. That could be 1500 W or 1 pW depending on the band, path, and conditions. For EME and VHF weak signal modes like ionoscatter a few hundred watts may be necessary. Like JT65 Q65 is 100% duty cycle and the same considerations for PA current and temperature should be observed as would be for any other 100% duty cycle mode like FM. 73 Bill G4WJS. _______________________________________________ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net <mailto:wsjt-devel@lists.sourceforge.net> https://lists.sourceforge.net/lists/listinfo/wsjt-devel
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