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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <1548945782023.57164@kuleuven.be> Content-Language: en-US X-Provags-ID: V03:K1:VdJUbrM62w1uwdpu4d8+26wdwKQfi+JzY53bAyVAXpiTAK7yE2x cUahCmRD/j5b1YB9jgQRdXz/YLo41gAZr4R4R0Oe8oj2VaIsl7mpf2noC6zUqcW4hys0zJq B8Wsk3zbBRuiql6rIl+hevazqvFUTQkKgRDnJbO3mZnngksK7H6c5T0bYW0/L9oUmnzWRBM Yal0ptRjIzGa3oQ+q46aA== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:/pJx4d66e4Y=:onyiZbdf/mhDFLrJOoJyEz G/ajMKRzA3iQlIBCAVLoAc8X3V3Gmn76wqtoWWzW/UnOa0+2ySIXoz0d0SE1k4oatWVD4cCtA /q3hKgHzfh7dDxZO+jV13u6tSmk/w/AhS6gKBRA9z00uD71XEUAKaGmzdM/SSUgRMbfmqxPYt bo7TMhp1WyJu9GIpc9LQARGNcxCXGobwWQNALvyTvknoRcUtXNRj8ETd8yt4QvWUTH3ksJAVY QFt6v/zQOdvhiqOr3tlzOgjqsWAzjtJ6k0dYucBciQp9DzpKo8iCOuIUEzBr63OvDwd10PidB UARyPhJ8xWtXieN/210/d1xAJeAjcSwmWOVbenMbUyCNKg4scZ+pfMrqijytW2f5tCtXumsQ+ Sa8v2acYSKYo/nc966nMjhI/h3cAeTRPdWoE+SCYrOeIaMrn94tEO25NAWanmeSBqY/tyIRGC mg8X3KqdteyUG2QVu4yoFPPNxzYgl2IO/8O2cTQx1xlH7C5sFujAhiEJZbOjXflqh0y0caSpe bFuRRLxj7uUhwBBCrH+osup553HFtvu+0fESm0DJfR69YF1nvRPAW7V4I9EYefOlN8aLuRk31 75MFaOQ/wkyXTdmHvuvCkU4KGo9XH3mWVfvS+pf12dHguvg7+tjQv6m8cBzd5k9dp5q2YkeM3 67xvEsMLDqHTD03HqOUKMQl2hwFR3qgn+aOZ/4+zWImjJY3h9oFGxe+VCA94zc23l8g6jt3lb ARf62Eoa9WMBzYdMa8ChHgMLsbQ+3r7hfzM5frdg0hnY84ztK/1vG69ivgc= X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hello Rik, all, Two comments, see below. > Interestingly Rik's SlowJT9 which was running in parallel, > managed to decode a couple of more transmissions than WSJT-X." Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [74.208.4.194 listed in list.dnswl.org] 0.0 RCVD_IN_MSPIKE_H3 RBL: Good reputation (+3) [74.208.4.194 listed in wl.mailspike.net] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record 0.0 RCVD_IN_MSPIKE_WL Mailspike good senders X-Scan-Signature: fc152e7304849b9a177649b85aea9f41 Subject: LF: Re: [rsgb-lf-group] SlowJT9 update (v0.9.15.0) Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false Hello Rik, all, Two comments, see below. > Interestingly Rik's SlowJT9 which was running in parallel, > managed to decode a couple of more transmissions than WSJT-X." I have seen this work both ways. Sometimes SlowJT9 will decode something WSJT-X does not. Other times WSJT-X will decode something SlowJT9 does not. Usually they are equal. > 2. Add optional internal frequency conversion to allow reception > at higher frequencies I have done some preliminary tests (based > on the code snippet Wolf, DL4YHF, sent me) and it seems to work > fine. But I am not sure that it will be very useful as frequency > conversion will not increase the usable frequeny range, but just > shit it. Eg: now JT9-10 can be received from 100 Hz to 415 Hz > audio. After USB downconversion with a 1 kHz carrier the range > will be 1100 Hz to 1415 Hz. The only reason I can think of to > want frequency conversion is if you use a fixed frequency (ofen > 800Hz) CW filter, so you can fit the JT9-5 or JT9-10 frequency > range into the filter passband. But this downconversion requires > a Hilbert transform (90 degrees all pass filter) that never can > be perfect and this will cause some distortion (in particular at > the lower and of the passband). So before I start the effort to > implement this in SlowJT9 I would like to know if there is an > audience for it. I think there is justification for it on 2200m if it comes without too high cost in lost sensitivity. Some people cannot easily tune antennas down to 136.4 or so. But if we operate at 137.x then listening stations must adjust their receiver because the usual 136.000 'dial' frequency will not allow receiving JT9-5 or JT9-10. This is not the usual setting for most who also want to monitor WSPR or other modes. For pre-arranged QSOs this will not matter, but for calling CQ it is good to operate where we can be heard without special receiver settings. However, if this feature comes with significant loss of decoding sensitivity, then I would vote to stay as we are. 73, Paul N1BUG