[Elecraft] K1 on 160M

[Steven Connors]

I managed to put my K1 (#1152) on 160 meters using a 2 band filter board
shared with components from Elecraft for 80.  From what I can tell it seems
to be working well.  Power out is around 7 watts max.  I don't have a
spectrum analyzer (wish I did) but  using my Icom the harmonic suppression
seems to be about the same as the other bands.  I only found a couple of
other very weak spurious signals which didn't move the S meter at all.  I
had looked through the archives for postings from others who had already
tried to do this but couldn't come up with anything so I figured I'd post
what I did for others who may be interested.

I set up the 160 M components as band 1 on the 2 band filter board.  For X1
I picked up a 6.8 MHz crystal from International Crystal Manufacturing.  L1
and L2, the variable inductors, are the same 1 micro henry inductors that
Elecraft supplies for the other bands.  The following are the other
components I used for the bandpass and the low pass filters.  All caps are
NPO.  The 12 pf is a disc ceramic.  The others are all monolithic ceramic.

Premix Bandpass
C1 & C5:  680 pf
C2 & C4:  2700 pf
C3:  12 pf

RF Bandpass
C11 & C15:  18,000 pf
C12 & C14:  12,200 pf (10,000 and 2200 paralleled)
C13:  330 pf

Low Pass Filter:
C21 & C23:  2200 pf
C22:  4700 pf
L9 & L10:  3.84 micro henries (31 turns on a T37-2 red core)

Now for some thought about trying to set up a more adequate antenna for 160.

If anyone would like any more info about this, let me know.

72,
Steve, K1HJ