in my ic 765 i have passband tuning and notchfilter .... great things to have for psk i can not switch in the cw filter in ssb mode :-( .... yet .... :-) but i am thinking of a mod like i did on my ft 757 .... cw filter switched in in ssb receive and passband tuning ... would give variable bandwith down to zero ... good dxing dg9bfc sigi ----- Original Message ----- From: "Charles Brabham" <n5...@uspacket.org> To: <digitalradio@yahoogroups.com> Sent: Friday, May 29, 2009 9:31 AM Subject: Re: [digitalradio] Really beating the AGC issue with PSK ?
> A Phil pointed out, the only real fix is on the TX end - the transmitting > station should be putting out a clean signal. Universal distribution of the > following info will help there. > > Clean PSK signal: > Turn your power control to full power, Mic gain in its normal position for > SSB phone use, and start off with the audio out from your computer turned > way down, so when the PSK program is in TX mode ( transmitting ) no output > power is shown on the rig's power out meter. Now slowly raise the computer's > audio-out until you see the maximun power your rig will put out with no AGC > action observed. That is, crank up the computer's audio out until you see > AGC action on the rig, then back off until you do not. At this point, you > can use the rig's Mic gain to fine-tune the signal further, if necessary on > different bands. What you idealy want is 25-30 watts output power with > absolutely no AGC action. - You then have a clean signal. More power out is > OK, as long as no AGC action is observed. > > BUT - there is a simple trick to use on the RX end of things, if your rig > has a notch filter. > > While watching the waterfall display, turn on the rig's notch filter, which > will produce a narrow "dead" area on the waterfall display. If you do not > see the dead area after a few seconds, move the notch control until you do. > Note that by watching the waterfall display as you tweak the notch control > very slowly, you can literally steer the notch around to cover up any signal > you wish. Steer the notch to cover up the offending signal. You can put it > right up against the signal you wish to receive if necessary, wiping out an > adjacent signal that is crashing your QSO. This may be crude, but it is also > quite effective. On my Kenwood TS-450S, the notch is just the right width to > effectively cover splattery, overdriven PSK signals. > > Hope this information is useful! > > 73 DE Charles, N5PVL > > > > ------------------------------------ > > Announce your digital presence via our Interactive Sked Pages at > http://www.obriensweb.com/sked > > Recommended digital mode software: Winwarbler, FLDIGI, DM780, or Multipsk > Logging Software: DXKeeper or Ham Radio Deluxe. > > > > Yahoo! Groups Links > > > > ------------------------------------ Announce your digital presence via our Interactive Sked Pages at http://www.obriensweb.com/sked Recommended digital mode software: Winwarbler, FLDIGI, DM780, or Multipsk Logging Software: DXKeeper or Ham Radio Deluxe. Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/digitalradio/join (Yahoo! ID required) <*> To change settings via email: mailto:digitalradio-dig...@yahoogroups.com mailto:digitalradio-fullfeatu...@yahoogroups.com <*> To unsubscribe from this group, send an email to: digitalradio-unsubscr...@yahoogroups.com <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
