Tom, I believe that the government, military, et al have mandated USB for "everything."
73, George W5YR Fairview, TX [EMAIL PROTECTED] http://www.w5yr.com ----- Original Message ----- From: "Tom Hammond" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]>; "Ron Ricketts" <[EMAIL PROTECTED]>; <[email protected]> Sent: Friday, September 03, 2004 9:48 AM Subject: Re: [Elecraft] K1 Filter Board Questions > Hi Daniel: > > Well, he MIGHT be able to come up with a filter to cover 80/60, but I'm not > certain about the signal inversion on that band... might not permit USB > reception... can't believe the FCC mandated USB in a (larger) band segment > which typically ALWAYS defaults to LSB, due to mixing 'standards'. > > 73, > > Tom > > At 08:14 AM 9/3/04, Daniel Reynolds wrote: > >But - if you consider that he also wants to receive on 60m (although I don't > >know enough about tuning bandwidth considerations for the K1, and whether or > >not the SSB would be normal or inverted), maybe the filter could be > >constructed > >so that he has 80/60 and 40/30? > > > >- Daniel / AA0NI > > > >--- Tom Hammond <[EMAIL PROTECTED]> wrote: > > > > > Hi Ron: > > > > > > At 10:34 PM 9/2/04, you wrote: > > > >I have obtained a K1 and have a couple of questions regarding the KFL1-4 > > > >board. Is there any reason it can't be constructed with 80 - 40 - 30 - 20 > > > >meters? If you purchase a new one it comes with 40 - 30 - 20 - 17/15 > > meters. > > > > > > > >Considering the state of the solar cycle I'd prefer a board with lower > > > >frequency capability. So is it possible to build a board with 80 - 40 > > - 30 > > > >- 20? > > > > > > > >Second question has to do with 60 Meters. Is it technically feasible to > > > >have 60 meter receive cavility on a K1, assuming the toroids and other > > > >components aer appropriate to the frequency? > > > > > > > >The K1 is a super little rig and I'ce already become very fond of it. It > > > >would be perfect if I could get my preferred band selection on one filter > > > >board. > > > > > > The K1 4-band board CAN be constructed for 80M, BUT then you'll have to > > > give up 40M!!! Here's why... > > > > > > The two 2-band filters in the KFL1-4 are designed so that the upper > > > frequency cutoff of each filter is above the higher of the two > > frequencies, > > > BUT LOWER THAN the 2nd harmonic of the lower frequency. > > > > > > In other words, the 40M/30M filter cuts off above 10MHz, and BELOW 14MHz. > > > If you were to build the first filter for 80/40 meters, then the filter > > > would have to be able to pass both 3.5 and 7.0 MHz energy, thus allowing > > > any potential 80M 2nd harmonic energy through to the antenna... this comes > > > under the heading of "Bad things will happen". So, in order for the KFL1-4 > > > to be built to accommodate 80M, it's have to cut off at a frequency lower > > > than 40M, which means that you'd have 80M, but not 40M. > > > > > > Sorry pal. Good try though... > > > > > > 73, > > > > > > Tom Hammond N0SS > > > > > > > > > _______________________________________________ > > > Elecraft mailing list > > > Post to: [email protected] > > > 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: [email protected] > 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: [email protected] 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
