[Elecraft] Decoding KX2, KX3 ATU.DATA Lde.Cfg.nh

[Mike Morrow]

Operating manuals for the KX2 and KX3 provide no process for determining ATU L, C, and network configuration from ATU.DATA or ATU MD functions.
 
The ATU.DATA section in the KX2 and KX3 manuals should be revised to provide quick determination of ATU L, C, and configuration.
 
Mike / KK5F

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(Suggested)
KX2 MANUAL REVISION for
ATU.DATA and ATU MD

In ATU.DATA or ATU MD, tapping ATU displays Lde.Cfg.nh.  The following table translates de to L uH and fg to C pF.  h shows the L-network arrangement.

defg
HEX   Ld       Le            Cf       Cg
0    -     0         0              0         0
1    -     1      .05         164       10
2    -     2      .11         330       18
3    -     3      .16         494       28
4    -     4      .23         680       39
5    -     5      .28         844       49
6    -     6      .34       1010       57
7    -     7      .39       1174       67
8    -     *      .50            *          82
9    -     *      .55            *          92
A   -      *      .61            *       100
B   -      *      .66            *       110
C   -      *      .73            *       121
D   -      *      .78            *       131
E   -      *      .83            *       139
F   -      *      .88            *       149  
        * Not valid for KXAT2

DECODING Lde.Cfg.nh

1a.  Enter d on the HEX column and find the value of Ld from the Ld column.
1b.  Enter e on the HEX column and find the value of Le from the Le column.
1c.  Add the values of Ld and Le to find KXAT2 L in uH.

2a.  Enter f on the HEX column and find the value of Cf from the Cf column.
2b.  Enter g on the HEX column and find the value of Cg from the Cg column.
2c.  Add the values of Cf and Cg to find KXAT2 C in pF.

3a.  If h is t, then C connects from common to transmitter side of L.
3b.  If h is A, then C connects from common to antenna side of L.
 
The KXAT2 produces 32764 unique ATU network configurations.

Examples:

L4F.C2B.nA means
L=4.88 uH, C=440 pF, C on antenna side

L51.C67.nt means
L=5.05 uH, C=1077 pF, C on transmitter side

********************
(Suggested)
KX3 MANUAL REVISION for
ATU.DATA and ATU MD

In ATU.DATA or ATU MD, tapping ATU displays Lde.Cfg.nh.  The table following translates de to L uH and fg to C pF.  h shows the L-network arrangement.

defg
HEX   Ld       Le            Cf       Cg
0    -     0         0              0         0
1    -     1      .06         164       10
2    -     2      .12         330       18
3    -     3      .18         494       28
4    -     4      .25         680       39
5    -     5      .31         844       49
6    -     6      .37       1010       57
7    -     7      .43       1174       67
8    -     8      .50       1360       82
9    -     9      .56       1524       92
A    -   10      .62      1690     100
B    -   11      .68      1854     110
C    -   12      .75      2040     121
D    -   13      .81      2200     131
E    -   14      .87      2370     139
F    -   15      .93      2534     149

DECODING Lde.Cfg.nh

1a.  Enter d on the HEX column and find the value of Ld from the Ld column.
1b.  Enter e on the HEX column and find the value of Le from the Le column.
1c.  Add the values of Ld and Le to find KXAT3 L in uH.

2a.  Enter f on the HEX column and find the value of Cf from the Cf column.
2b.  Enter g on the HEX column and find the value of Cg from the Cg column.
2c.  Add the values of Cf and Cg to find KXAT3 C in pF.

3a.  If h is t, then C connects from common to transmitter side of L.
3b.  If h is A, then C connects from common to antenna side of L.
 
The KXAT3 produces 131068 unique ATU network configurations.

Examples:

L4F.C2B.nA means
L=4.93 uH, C=440 pF, C on antenna side

L51.C67.nt means
L=5.06 uH, C=1077 pF, C on transmitter side

LDA.CE9.nA means
L=13.62 uH, C=2462 pF, C on antenna side

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