I tested, as far as I could use my ears, but it is difficult to be sure ( especially being in Londodn, UK, and having S5-S9 noise on all usable bands), I was hoping someone has tried a similar thing, or someone at Elecraft can explain what is happening in such a situation in the radio.
E.g. what kind of difference should I look for ? Is it the signal itself altered (and how), or just the passband i.e. some frequencies missing at the end of the passband. In this case, if I set the offset on .88 in and specify the filters as having 2.6 khz width (instead of 2.7), would then the radio behave as that was true, i.e. no different from the configuration I specified, although it is not the true configuration? Or would it be better to leave it at 2.7 ? In any case, thank you everyone for the answers you sent so far, Adi 2E0TTX On 14/04/2011 02:14, pcbyrne wrote: > test > > > > _____ > > From: Barry N1EU [via Elecraft] > [mailto:ml-node+6271081-1705900565-157...@n2.nabble.com] > Sent: Wednesday, April 13, 2011 7:19 PM > To: pcbyrne > Subject: Re: K3 filter question > > > > aandrei wrote: > > I have the 5 pole 2.7 filters for main and sub RX. > One filter offset is -.94, the other is -.81 > In order to do diversity receive, I have to set them both to about -.88 > > My question is: what happens when you set a filter offset differently than > the one specified (as in my case) ? > How is this supposed to influence operation (normal as well as diversity > mode) ? > How can things be improved, short of buying new filters? > > By offsetting the 2.7Khz filter center freq, you may incur some slight > asymmetry in the passband response at the lower and/or upper knee of the > response curve, but the vast majority of the passband will be unaffected. > If noticeable, it will be relatively minor. The other options would be to > use closer matched 5-pole filters or use 8-pole filters. > > 73, Barry N1EU > > > > _____ > > If you reply to this email, your message will be added to the discussion > below: > > http://elecraft.365791.n2.nabble.com/Re-k3-receive-audio-tp6259940p6271081.h > tml > > To start a new topic under Elecraft, email > ml-node+365791-145773984-157...@n2.nabble.com > To unsubscribe from Elecraft, click > <http://elecraft.365791.n2.nabble.com/template/NamlServlet.jtp?macro=unsubsc > ribe_by_code&node=365791&code=dzdubWRAdHdpbmxha2VzLWFyLnVzfDM2NTc5MXwxMDQyOT > EzOTY1> here. > > > > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/Re-k3-receive-audio-tp6259940p6271190.html > Sent from the Elecraft mailing list archive at Nabble.com. > ______________________________________________________________ > 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
