OK Lonnie, the following is a copy of my post a long time ago that described
how to put a K1 2 band board on 160 meters. Unfortunately, Elecraft has not
included this as a band kit, so you will have to look elsewhere for the
crystal (Elecraft has all the other parts).
73,
Don W3FPR
--
Hi Folks,
I have been successful in putting a K1 on 160 meters with full 7 watts
output - well I peaked things at the low end of the band and got 7.4 watts,
but it sagged to 6.8 watts at the high end - not really shabby - I conclude
that the bandwidth is quite adequate.
I borrowed the bandpass and low-pass filter values from the K2 and used the
pre-mixer values that Steve K1HJ had used successfully, so I can claim no
original design.
This is not my K1, but one I had built for Curt W3HQ about 2 years ago. He
sent me the K1 with a 2 band board - originally for 80 and 15 meters - but I
did not even open the package with the 15 meter components.
I ordered the following from Elecraft:
Capacitors:
2 - E530002 1500 pf capacitor
3 - E530003 2700 pf capacitor
2 - E530005 1200 pf capacitor
2 - E530035 1800 pf capacitor
2 - E530052 560 pf capacitor
2 - E530053 680 pf capacitor
1 - E53005812 pf capacitor
Inductors:
1 - E690007 33 uh inductor
2 - E690001 4.7 uh variable inductor (wide tuning slot)
Toroid cores:
2 - E680001 T44-1 or T50-1 toroid cores (blue color)
I also ordered a 9.800 mHz crystal (HC-49 case 20 pf load capacitance) from
International Crystal Manufacturing www.icmfg.com.
Also, I pulled a 820 ohm 1/4 watt resistor from my junkbox.
If you are planning to use the K1 ATU with this board, you should also order
the P1 (3 pin) and P2 (10 pin - 5 x 2) headers from Elecraft.
The parts from Elecraft (without the headers) were less than $15 and the
crystal was priced at $17.95 - not an unreasonable price IMHO.
I assembled the 2 band board with the 80 meter components in the band 2
locations as indicated in the instructions - except for L5 and L6 were left
empty at this time.
Next, the low- pass toroids were wound with 21 turns (20 inches of wire) on
the T50-1 (blue) cores, and soldered into the L9 and L10 positions.
The 4.7 uH variable inductors were soldered in the positions for L5 and L6.
On the bottom of the board, 1200 pf capacitors were soldered across L5 and
L6 (the outer pins on the side of the can with 3 pins). in addition, the
820 ohm resistor was soldered across L6.
The 33 uH inductor goes into the position marked for C13. Form the leads
under the inductor body so that the leads fit into the holes - my inductor
is parallel with the board and tucked between the bandpass filter cans.
Mount the 9.8 mHz crystal at the X1 position and solder the grounding wire
to the side of the can (or top if you prefer).
The remaining capacitors are fitted into the following positions:
C1 C5 - 680 pf
C2 C4 - 2700 pf
C3 - 12 pf
C11 C15 - 1800 pf
C12 C14 - 560 pf
C21 C23 - 1500 pf
C22- 2700 pf
You should now have all the holes filled, and can proceed to align the 2
band board following the instructions in the K1 manual. Mine came up with
no trouble at all.
Perhaps Wayne and Eric would consider putting together a package of parts as
an option for the 2 band board is there are enough requests for it. All the
parts are stock items for Elecraft except for the crystal.
Have fun with it, and let me know your results if you duplicate my efforts.
In the next few weeks (well, maybe after Christmas) I will put together an
article with a couple of photos for my webpage - I'll let you know when I
have it complete.
73,
Don W3FPR
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