Wayne Will the variable bandwidth filters have better ultimate rejection/less blowby than the variable bandwidth filter in the K2? 73, Bob N6WG
----- Original Message ----- From: "wayne burdick" <[EMAIL PROTECTED]> To: "Toby Deinhardt" <[EMAIL PROTECTED]> Cc: <elecraft@mailman.qth.net> Sent: Sunday, April 29, 2007 4:30 PM Subject: [Elecraft] Re: roofing filter loss and method of compensation > Wow, Toby, that *is* a complicated question, partly because we haven't > nailed down the specs for our variable-passband roofing filters yet. > I'd leave room for at least one of those (CW or SSB bandwidths). > > Here's a set that covers all modes including AM and FM: > > FL1 = FM bandwidth (something like 13 kHz) > FL2 = 6 kHz (AM; wide SSB) > FL3 = 2.8 kHz (workhorse SSB filter) > FL4 = 500 Hz (nominal CW) > FL5 = 200 Hz (narrow CW) > > If you were doing primarily SSB, you might want to go with 1.8 or 2.1 > kHz at FL4. At present these filters are only offered by INRAD. We plan > to offer a variable-passband 5-pole filter that covers something like > 1.8 to 2.5 kHz that would fill this bill in the future. > > Having used something different at FL4, you'd then need to reevaluate > FL5. It could be 400 Hz (INRAD fixed), 500 Hz (Elecraft fixed), or even > an Elecraft variable CW/DATA bandwidth filter -- TBD, but probably > something like 300-600 or 300-800 Hz. > > Of course this assumes that you want AM and FM-bandwidth filters. If > you don't operate in these modes, you'll have more SSB/CW/DATA filter > flexibility. You could also put narrower filters on the sub-receiver. > > 73, > Wayne > N6KR > > On Apr 29, 2007, at 1:13 PM, Toby Deinhardt wrote: > > > Hi Wayne, > > > > I know that this is a really loaded question, and I am sure that if > > you put three hams in a room you would get 7 opinions... > > > > What combination of filters (fixed and/or variable) would you feel are > > appropriate for... > > > > > --- > > http://www.elecraft.com > > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
