Hi Matt, I enjoy to contact you in JT65 before Winter "break"! My shack is in a camping site and accessible only during not too cold days (805m over sea level) At home QTH, i work with my old coil loaded mobile Hustler antenna fixed at balcony at 3rd floor with ~30° tilt from vertical position... If i remember, i've never contacted the West coast with this configuration; may be for this Winter???
73 QRO de Rudi (instead of Rudolf for JT65...), HB9ARI Matt Zilmer wrote: > Ken & Rudi, > > I monitored you two working on 20m JT65A a few days ago, when I was > getting this computer set up and the levels right (again - new > laptop). Any idea how many other K3'ers are into JT65A? > > 73, > matt W6NIA > K3 #24 > > On Wed, 11 Nov 2009 13:10:25 -0800 (PST), you wrote: > > >> Rudolf, >> >> We have worked many times on JT65A , I also use a K3. >> I operator in the Data mode , ( setup data mode for USB ) >> and have had no problem for about a year. >> I think this is the best way to run data modes. >> I set the shift at 1250 hz and the BW at 1200 HZ. >> The JT65 software only looks at 1200 hz bandwidth. >> This works for me. >> GL 73 Ken K5DNL >> >> ------------------------------------------------------------------ >> >> >> --- On Wed, 11/11/09, hb9ari <[email protected]> wrote: >> >> >>> From: hb9ari <[email protected]> >>> Subject: Re: [Elecraft] JT65A output power variations. >>> To: "Elecraft-forum" <[email protected]> >>> Date: Wednesday, November 11, 2009, 9:59 AM >>> Hello Matt, >>> >>> Yes, TX EQ is flat. I've tried to compensates >>> with TX EQ, but i've all "reseted" to "flat". >>> >>> Thank you for this indication. >>> >>> 73 QRO de Rudolf >>> HB9ARI >>> >>> Matt Zilmer wrote: >>> >>>> Since you're using USB, you might want to be sure you >>>> >>> have the TX EQ >>> >>>> "flat". Or use DATA A, where the EQ doesn't >>>> >>> apply. >>> >>>> 73, >>>> matt W6NIA >>>> >>>> On Wed, 11 Nov 2009 11:28:36 +0100, you wrote: >>>> >>>> >>>> >>>>> Hi Julian, >>>>> >>>>> Thank you for your fast answer! >>>>> A 1st point, as with the FT857, i'm using >>>>> USB mode for JT65A. For the filter used, >>>>> i ordered a 8 poles 2.8k with my K3, >>>>> but i'm not sure if the 5 poles 2.7k "original" >>>>> and always installed as FIL2 is not >>>>> selected during TX???; next week-end, when >>>>> active at my "external" shack, i will look how >>>>> to remove the 2.7k filter, as i've also problem >>>>> with center filter when i adjust the HI LO >>>>> filter controls; when the 2.7k filter is >>>>> >>> (automatically) >>> >>>>> selected, i've a big discontinuity with >>>>> >>> filter setting. >>> >>>>> As you say, i will look if the 2.7k is not >>>>> >>> selected >>> >>>>> during TX. I read also the "problems" when in >>>>> DATA A mode, but as said, i'm working in USB >>>>> (as recommended for JT65A for all RF bands) >>>>> and VOX work at perfection too. >>>>> >>>>> My best 73, Rudolf >>>>> HB9ARI >>>>> >>>>> PS As i expect to get 50W output when i set >>>>> the control to 50W, i've adjusted the audio input >>>>> level for max bars on ALC. For PSK31, i work >>>>> with ~ 10 to15W max for 100W selectes with >>>>> the control and "local" receiving give me an >>>>> >>> "acceptable" >>> >>>>> -24 to -28dB IMD. >>>>> >>>>> >>>>> Julian, G4ILO wrote: >>>>> >>>>> >>>>>> 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. >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>> This topic has been brought up before in the >>>>>> >>> context of RTTY. The reason is >>> >>>>>> that there is no automatic level control in >>>>>> >>> DATA A mode (or rather, there >>> >>>>>> is, but it is very slow acting to avoid >>>>>> >>> causing IMD on PSK31 signals) so >>> >>>>>> there is no compensation for ripples in the >>>>>> >>> roofing filter passband. It has >>> >>>>>> been suggested that the problem is less when >>>>>> >>> using the 8-pole SSB roofing >>> >>>>>> filter as it has less ripple than the standard >>>>>> >>> 5-pole filter. >>> >>>>>> The output should not vary as much as you >>>>>> >>> suggest while working within the >>> >>>>>> normal passband for JT65A operation so I'm >>>>>> >>> wondering if you have correctly >>> >>>>>> adjusted the audio input level in DATA A to >>>>>> >>> get 5 bars on the ALC scale. >>> >>>>>> This will not prevent the power varying for >>>>>> >>> different tones during a >>> >>>>>> transmission but it should help maintain a >>>>>> >>> constant average level when >>> >>>>>> working at different places within the >>>>>> >>> passband. >>> >>>>>> ----- >>>>>> Julian, G4ILO. K2 #392 K3 #222. >>>>>> * G4ILO's Shack - http://www.g4ilo.com >>>>>> * KComm - http://www.g4ilo.com/kcomm.html >>>>>> * KTune - http://www.g4ilo.com/ktune.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 >>>>> >>>>> >>>> >>>> >>> ______________________________________________________________ >>> 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 >> > > ______________________________________________________________ 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
