> 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
