Hello Lance, I use the same settings for ALC(also 5 bars in JT65), USB and use the rear LINE IN. As you are using the original 2.7kHz filter this seems not be the problem.; BUT i don't use compression and this can explain that you don't have "my" output power variation; i can imagine that 20dB compression should be able to "compensates" a ~ 3dB HF output variation. In receive, i have no problem. Some time ago, i do a HF output response measurement (with a LP-100) and i remember that the curve was far from flat...As it was before i use JT65, with voice, my correspondents don't hear something "wrong". It's only since i use extensively JT65 and monitor my output power according QRP'ers request, HF band, etc that i've remarked this > 3dB output variation. For ~ 1000 HF JT65 QSO, i worked from 0.5W to (exceptionally) 300W. My "usual" power is between 25W and 50W. I think that compression will correct (if necessary..) "my" problem but the source seems to be from the filter used in TX. Next week-end i should be clear about that.
For the moment, i'm not QRV on 6m Terrestrial, MS or EME. Just SSB when apertures are there. Thank you for your explanations and i will try compression; habitually, i don't like too much to use it, but... 73 QRO, Rudolf HB9ARI Lance Collister, W7GJ wrote: > Hello Rudolf, > > I use JT65A all the time with my K3 for 6m EME, and I have always used > USB mode for it. I have no trouble with the USB setting...I have > never even tried the DATA options. I have the standard 2.7 kHz > filter, and set the audio just like I do for USB voice. I make sure > to have the ALC fill the 5 bars on the meter, and I use 20 dB of > compression to make sure that all the tones come up to the proper > power levels. I use the LINE IN on the rear panel for my incoming > JT65A tones from the computer. > > I find the K3 a great rig for JT65A because I can make a flat > bandwidth 300 Hz to 2200 Hz, and decode callers over that entire > frequency range. I usually run JT65A with the NB on the first setting > (IF NAR 1), DSP OFF and the AGC off. It is an amazing mode because it > has 10 dB sensitivity over CW. Most of the time on 6m EME, signals > are too weak to hear, but they are nicely displayed on the SpecJT > screen and decoded on the JT65A screen. > > Now that we are at the bottom of the sunspot cycle, the ionospheric > propagation is very poor. However, because the geomagnetic field is > usually very quiet these days, this is the VERY BEST time for 6m EME! > That is why there has been so much growth in 6m EME over the last > year, and there have been such successful DX operations by small 6m > stations using JT65A mode with just a single yagi aimed at the horizon. > > GL and VY 73, Lance > > hb9ari wrote: >> Hello, >> >> As i use principally JT65A (snice ~ 2years), >> i've remarked transmit output power variations >> depending where the audio is located in the waterfall, >> as i'm not speaking English, it's difficult to explain correctly; >> if i'm ~ in the middle of the waterfall (~ 1200Hz) >> i get over 3dB in output power variations; for an expected >> 50W output power, between some tones of the JT65A >> modulation, the output level can vary from 20W >> to 60W; if i'm working away from the "middle", >> variations are lower and acceptable but most >> of time, "central" frequencies are used... >> I've always worked with this "problem" as i >> expect some AGC effect by the receiving side... >> I would appreciate to have an explanation >> of this effect. >> >> Many TNX for an answer. >> >> 73 QRO de Rudolf, HB9ARI >> >> PS With the same sound card and software, >> using my "old" FT857 (non D) TX/RX, the >> output power variation is well under 1dB >> until the audio band edges. >> >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> >> > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
