I agree. The cost of the K3 filters is now so high in the UK, that I want to get away with the minimum number necessary.
73 Stewart G3RXQ On Thu, 9 Jul 2009 10:00:42 -0400, Joe Subich, W4TV wrote: > >> I wonder if there is any possibility of allowing AM TX and/or >> ESSB via the FM filter... > > It is theoretically possible to transmit AM and ESSB through > the FM filter but the K3 is currently configured to prohibit > AM and ESSB transmit unless the 6 KHz filter is used. I have > transmitted using the FM filter by setting the K3 as if the > FM filter was an AM filter but then I can not transmit FM > without resetting the filter set-up. > > Elecraft will argue that the 6 KHz filter is necessary to > prevent transmitted images (the DSP IF is 15 KHz, the image > is 30 KHz away from the transmit frequency). However, I > can not measure any image - to -120 dB from the CW level - > when looking at the transmitter output with a directional > coupler using the SDR-IQ as a spectrum analyzer. This > is as expected since the FM filter should be at least -60 > dB at +/-23 (2:1 shape factor) with an ultimate attenuation > of at least -100 dB. > > It would certainly be nice if the "6 KHz" restriction was > removed. > > 73, > > ... Joe, W4TV > > >> -----Original Message----- >> From: elecraft-boun...@mailman.qth.net >> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brett Howard >> Sent: Thursday, July 09, 2009 2:21 AM >> To: Bob Cunnings >> Cc: elecraft@mailman.qth.net >> Subject: Re: [Elecraft] K3 Filter Question >> >> >> I forgot to go back to that... I was thrown off by the >> comment on the order page that said you only need one of each >> filter for transmit. I know that doesn't fully say what I >> was hoping for though.... >> >> I wonder if there is any possibility of allowing AM TX and/or >> ESSB via the FM filter... As I'd like to have maximum >> flexibility but only have one slot left because of the way I >> have setup the radio for what I spend most of my time doing. >> >> Thanks for the assistance gentlemen. >> >> ~Brett >> >> On Thu, 2009-07-09 at 00:13 -0600, Bob Cunnings wrote: >> > Manual, pg 74: >> > >> > "Rule #1: If you plan to use a particular filter for both >> transmitting >> > and receiving (main receiver), you'll need to install it on the RF >> > board. You can optionally install a filter of the same or similar >> > bandwidth on the sub receiver for receive-only use. (This is >> > recommended since it will keep the receivers identical.)" >> > >> > Bob NW8L >> > >> > On Wed, Jul 8, 2009 at 11:31 PM, Brett >> Howard<br...@livecomputers.com> >> > wrote: >> > > Ok so I'm curious if I'll be able to do what I'd like. >> I'd like to >> > > setup my K3 for maximum flexibility. At the moment I have these >> > > filters. >> > > >> > > 2.8Khz >> > > 1.8Khz >> > > 1Khz >> > > 250Hz >> > > >> > > These 4 filters are duplicated in the lower 4 slots of both >> > > receivers. I'd like to have the ability to do AM and FM >> both TX and >> > > RX in this radio. Can I add the AM filter and KBPF into >> the main RX >> > > and then put the FM filter into the KRX3? >> > > >> > > I'm hoping that I can then use the MainRX for broad frequency >> > > coverage and AM broadcast receive. Then if I ever want to do FM >> > > work I simply have to use the sub receiver to do so. Will TX >> > > through the FM filter work with it in the sub RX... To >> the best of >> > > my knowledge it appears that I can set the rig up in this fashion >> > > but that doesn't always mean it will work how I expect it to. >> > > >> > > Am I all wet here? >> > > >> > > Thanks >> > > >> > > ~Brett >> > > >> > > ______________________________________________________________ >> > > 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 >> > > >> > ______________________________________________________________ >> > 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 >> >> ______________________________________________________________ >> 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 >> > > ______________________________________________________________ > 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 ______________________________________________________________ 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
