[Elecraft] 160M K1 band option

[Don Wilhelm]

----- Original Message ----- 

> Hi All,
>             I would like to see an "Elecraft" 160m & 80M 2 band board for
my
> K1
-----------------------------------------

Rod,

Not quite a full "Elecraft" 160m & 80m board, but you can do it this way -
order a 2 band board for 80m and any other band, PLUS, order the following
components (Elecraft has them all except the crystal) - here are the
instructions for how I did it: --
maybe you can make a deal with someone at Elecraft to ship a ''1 band board
and the other needed parts"

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 - E530058    12 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.

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).

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.

73,
Don W3FPR