[Elecraft] K1 Filter Board Questions

[George, W5YR]

Tom, I believe that the government, military, et al have mandated USB for
"everything."

73, George W5YR
Fairview, TX
w5yr at att.net
http://www.w5yr.com


----- Original Message ----- 
From: "Tom Hammond" <n0ss at earthlink.net>
To: <dmrey73 at sbcglobal.net>; "Ron Ricketts" <ron at wa5vfa.com>;
<elecraft at mailman.qth.net>
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 <n0ss at earthlink.net> 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
> > >
> > >
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