Hi Wayne, Thanks for your comment. I have the stock 2700Hz for SSB and five pole 500Hz for CW which works for me.
Encouraged by some recent comments I've been playing with width and shift and find that 1800Hz BW centred on 1200Hz on SSB works very well and have loaded it into profile II. One nasty winters day I might just drag out the mod kit again. How do you know which end is which on the SMD LED? Regards, Mike VP8NO ----- Original Message ----- From: "wayne burdick" <n...@elecraft.com> To: "Mike Harris" <mike.har...@horizon.co.fk> Cc: "Elecraft Discussion List" <elecraft@mailman.qth.net>; "Geoffrey Mackenzie-Kennedy" <gm4...@btinternet.com> Sent: Tuesday, May 05, 2009 5:02 PM Subject: Re: K3 on-channel strong signal overload? | Mike, | | The AGC mod is definitely preferred. The old AGC circuit allows in-band | signals as low as S9 to activate hardware AGC. This would cause desense | if you were using a wide crystal filter but a narrow DSP filter. The | new AGC circuit has an in-band desense threshold of more like S9+20 to | +30. | | Of course we also recommend that you have at least one narrow crystal | filter (e.g., 400 or 500 Hz) if you're using CW or narrow data modes. | This changes the definition of "in-band" to such a small value that | desense due to adjacent signals becomes very rare. | | Those really pushing the envelope should consider our 200 Hz filter. | Ask a few 160 m contest operators about this :) | | 73, | Wayne | N6KR | | On May 5, 2009, at 1:29 PM, Mike Harris wrote: | | > Hi Geoffrey, | > | > I guess there are no simple answers to this apart from proper operator | > intervention. I guess that is why the buttons are there. I've no | > intention of adding any diode clipping, I don't have a problem even | > with | > my S-9+60++ neighbour. One thing to note is that #1400 doesn't have | > the | > hardware AGC mod installed so it is cutting in approx 20dB before the | > latest versions. I was on the verge of doing it before this thread | > started but I've put it away again.... ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
