I don't believe anyone has answered your filter question yet. If you plan on listening to shortwave or FM on the sub receiver you will need appropriate filters for those modes installed on the sub receiver. If you wish to listen to shortwave on the sub receiver you should also have the general coverage filter installed there. If you are trying to listen to an AM station with the sub receiver but without an AM filter on that receiver it will use the 2.7 or 2.8 roofing filter and that will severely restrict the frequency response.
Bruce-W8FU -----Original Message----- From: elecraft-mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Iain MacDonnell - N6ML Sent: Tuesday, February 10, 2009 2:12 PM To: d...@w3fpr.com Cc: James Sarte; elecraft@mailman.qth.net Subject: Re: [Elecraft] K3 sub-receiver usefulness? Don Wilhelm wrote: > James, > > You might want to reconsider whether you are listening to the SW > broadcast on the main or on the sub. The low pass filter will be on the > main antenna band selection, and if the subreceiver is attempting to > receive a signal above the main receiver frequency, you will see a > message flashed in the VFO B saying USE SUB RX. That is an indication > that the main RX LPF is attenuating the sub-rx signal. Actually the message is "USE AUX", which is the solution too. Connect a separate receiving antenna to the "AUX RF" input - or perhaps split your main antenna and send it to both inputs - and set the sub-RX to to use AUX. ~Iain / N6ML > If the main RX is at a higher frequency than the sub-rx, I do not > believe that is any problem, but when the situation is reversed, the LPF > will cut the response on the sub-rx. > > 73, > Don W3FPR > > James Sarte wrote: >> Hello group, >> >> Someone mentioned in one of the reflector emails that the new firmware >> under development will allow independent band switching/monitoring >> between VFO's without a sub receiver. Am I correct in my understanding >> then that without a sub receiver, this firmware will allow tuning and >> monitoring of separate bands? If that is indeed the case, can someone >> please clarify for me how that can accomplished with a single receiver? >> >> On a separate note, apart from diversity receive, I'm curious to know >> how other people are utilizing their sub receiver? The reason I ask is >> I'm finalizing my purchase of a K3, and am trying to determine whether >> it's necessary to fully load up both receivers now. At this point, I'm >> ready to purchase 2 general coverage modules plus 2 each of the >> following filters: 250KHz, 400KHz, 2.8Khz, 6KHz, 13KHz. I'd like to >> have the ability to monitor PSK31, FM or SW broadcast on the sub, >> while monitoring phone or engaging in a phone QSO on the main; both >> receivers being on separate bands. That's just one example. Another >> could be to monitor SW broadcast on the main while listening to 10m FM >> on the sub. Do I need to install the AM or FM filters in the sub to >> monitor SW or FM or can the sub's DSP take care of it? >> >> 73, >> >> James KC2UEE >> >> > ______________________________________________________________ > 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
