[Elecraft] Antenna?

[Doug Forman]

Okay, this is a follow-up to my KX1 antenna question posted last night.  
I came home tonight and did a bunch more measurements.

====================

First, grouped by antenna:

Cushcraft MA5V "Mini Vertical"
40m:  7055 - (tuner in - 2.1 Watts out, SWR 1.1 ) - (tuner out - 1.4 
Watts out, SWR 5.7) - MFJ-259B: SWR 7.6
30m:  10107 - (tuner in - 4.3 Watts out, SWR 5.6) - (tuner out - 6.3 
Watts out, SWR 9.9) - MFJ-259B: SWR 6.5
20m:  14065 - (tuner in - 2.1 Watts out, SWR 1.0 ) - (tuner out - 2.5 
Watts out, SWR 1.0) - MFJ-259B: SWR 1.1

Slinky Dipole "CliffDweller II"
40m:  7055 - (tuner in - 2.1 Watts out, SWR 1.0) - (tuner out - 2.0 
Watts out, SWR 1.3) - MFJ-259B: SWR 1.6
30m:  10107 - (tuner in - 1.8 Watts out, SWR 5.2) - (tuner out - 1.8 
Watts out, SWR 7.0) - MFJ-259B: SWR 8.4
20m:  14065 - (tuner in - 3.0 Watts out, SWR 1.2) - (tuner out - 1.4 
Watts out, SWR 8.0) - MFJ-259B: SWR 8.8

Dummy Load (Oil-filled "Can-tenna")
40m:  7055 - (tuner in - 2.9 Watts out, SWR 1.0) - (tuner out - 2.2 
Watts out, SWR 1.0)
30m:  10107 - (tuner in - 2.3 Watts out, SWR 1.0) - (tuner out - 2.5 
Watts out, SWR 1.0)
20m:  14065 - (tuner in - 2.3 Watts out, SWR 1.0) - (tuner out - 2.0 
Watts out, SWR 1.0)

====================

Second, grouped by band:

40 meters (7055)
MA5V Vertical - (tuner in - 2.1 Watts out, SWR 1.1 ) - (tuner out - 1.4 
Watts out, SWR 5.7) - MFJ-259B: SWR 7.6
Slinky Dipole - (tuner in - 2.1 Watts out, SWR 1.0) - (tuner out - 2.0 
Watts out, SWR 1.3) - MFJ-259B: SWR 1.6
Dummy Load - (tuner in - 2.9 Watts out, SWR 1.0) - (tuner out - 2.2 
Watts out, SWR 1.0)

30 meters (10107)
MA5V Vertical - (tuner in - 4.3 Watts out, SWR 5.6) - (tuner out - 6.3 
Watts out, SWR 9.9) - MFJ-259B: SWR 6.5
Slinky Dipole - (tuner in - 1.8 Watts out, SWR 5.2) - (tuner out - 1.8 
Watts out, SWR 7.0) - MFJ-259B: SWR 8.4
Dummy Load - (tuner in - 2.3 Watts out, SWR 1.0) - (tuner out - 2.5 
Watts out, SWR 1.0)

20 meters (14065)
MA5V Vertical - (tuner in - 2.1 Watts out, SWR 1.0 ) - (tuner out - 2.5 
Watts out, SWR 1.0) - MFJ-259B: SWR 1.1
Slinky Dipole - (tuner in - 3.0 Watts out, SWR 1.2) - (tuner out - 1.4 
Watts out, SWR 8.0) - MFJ-259B: SWR 8.8
Dummy Load - (tuner in - 2.3 Watts out, SWR 1.0) - (tuner out - 2.0 
Watts out, SWR 1.0)

====================

Notes:

1.  KX1 #731 with 30m and Antenna Tuner installed, running from 
batteries only, Lithium, 8.9v indicated.  All power out and SWR 
indications from the KX1 except as noted from the MFJ-259B.

2.  SWR Analyzer is MFJ-259B

3.  MA5V Vertical is tuned for digital modes, so SWR measurements of 1.0 
and 1.1 are expected.

Observations:

1.  KX1's antenna tuner does a fantastic job matching either antenna on 
40 meters.

2.  KX1's antenna tuner does a dismal job matching either antenna on 30 
meters.

3.  KX1's antenna tuner does a fantastic job matching the slinky dipole 
on 20 meters.
    (vertical is already resonant on 20m)

I guess it's just interesting to me that the internal tuner does such a 
GREAT job matching the 135' slinky dipole on both 20 and 40 meters, but 
falls apart on 30meters.  It's also interesting to me that the internal 
tuner NICELY matches the MA5V on 40 meters (it's only a 10-20m vertical 
with a SWR of 7.6 on the antenna analyzer at 7055khz).

I appreciate the suggestions I have received so far and will check them 
out - first by adjusting the coax length by adding some to see if the 30 
meter situation improves (without negatively affecting 20/40 meters).  
Any other observations or suggestions are welcome!

72's,

Doug  N7BNT