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Oct 16, 2006: The table below shows data comparing the AIM4160 with several antenna analyzers that are used by amateurs. (Note: The AIM4160 is the predecessor to the AIM4170 and it has the same performance up to 160MHz.)
ARRL members can access the original QST articles here: The ARRL was not involved with this series of tests on the AIM4160.

All data except for the AIM4160 are from the May, '05 and Nov, '06 issues of QST.
 
Load (Ohms)  Freq (MHz)  AIM4160  Autek VA1  Kuranishi BR210  MFJ269  Palstar ZM30  AEA Via Analyzer 
Timewave TZ900 

50  3.5 14 28 50 144 432 
50 + j0 49 + j0 50 + j0 49 + j0 49  j0  
52  j1 51  j1 58  j3    
51 51 50 50 50  
48 ± j0 48 ± j0 48 ± j0 48 ± j0 48 ± j1 1.1:1 swr 
53 + j0 52 + j0 53 + j0    
50 + j0 50 + j0 50 + j0 50 + j0 
48 + j0 48 + j0 48 + j0 48 + j0 
5.0  3.5 14 28 50 
5 + j0 5 + j0 5 + j0 5 + j0 
5  j1 6 + j0 5  j2  
<12.5 <12.5 <12.5 <12.5 
4 ± j2 5 ± j0 4 ± j3 4 ± j5 
3 + j2 3 + j2 3  j4  
3.2  j0 4.1  j0 5.5 + j2.1 5.6 + j7.9 
2.4 + j0 2.5 + j0 2.3 + j2.6 2.6 + j3.0 
25  3.5 14 28 50 
25 + j0 25 + j0 25 + j0 25 + j1 
25  j1 25  j0 23 + j0  
26 27 27 27 
23 ± j5 24 ± j2 23 ± j5 24 ± j6 
24 + j0 24 + j0 25 + j0  
25 + j0 25 + j0 25 + j0 25  j6.7 
23 + j0 24 + j0 24 + j0 24 + j0 
100  3.5 14 28 50 
100 + j0 100 + j0 100 + j1 100  j0 
100  j0 97 + j5 84 + j0  
100 100 100 100 
99 ± j17 97 ± j10 95 ± j23 87 ± j32 
108 + j0 106 + j0 102 + j0  
102 +j0 101 + j0 99 + j0 94  j11 
100 + j0 101 + j0 99 + j0 97 + j0 
Load (Ohms)  Freq (MHz)  AIM4160  Autek VA1  Kuranishi BR210  MFJ269  Palstar ZM30  AEA Via Analyzer 
Timewave TZ900 
200  3.5 14 28 50 
200 + j0 200 + j0 200 + j0 200  j0 
195  j16 170  j1 147  j3  
200 200 190 190 
185 ± j68 183 ± j0 156 ± j86 115 ± j98 
210 + j0 205 + j0 173 + j56  
199  j0 193  j0 176  j44 141  j69 
200 + j0 193  j26 175  j63 130  j144 
1000  3.5 14 28 50 
989  j12 990  j28 998  j61 
900  j46 590  j380 420  j11  
>400 >400 >400 >400 
661 ± j743 555 ± j368 130 ± j409 56 ± j258 
>600 >600 104  j449  
940 + j0 419  j510 259  j429 131  j238 
979 + j0 813  j506 607  j534 171  j633 
50  j50 Zmag=70.7  3.5 14 28 
50  j50 49  j51 50  j48 
50  j47 39  j41 55  j27 
80 85 80 
46 ± j47 63 ± j53 43 ± j45 
49  j47 44  j50 43  j43 
51  j44 47  j47 50  j63 
60  j46 71  j48 55  j44 
50 + j50 Zmag=70.7  3.5 14 28 
51 + j50 51 + j48 50 + j49 
54 + j55 53 + j54 52 + j34 
80 80 80 
50 ± j51 60 ± j42 54 ± j50 
55 + j50 60  j51 * 67 + j53 
55 + j50 61 + j50 58 + j55 
65 + j51 59 + j54 70 + j51 
Manufacturer's suggested list price ($US) 
495  200  430  360  350  690  1300  
* The 14MHz data in the original QST review is: 60  j51. The sign is shown correctly for 3.5 and 28MHz. 
Load Component Values
 

The tests designed by the ARRL use three types of loads:
The AIM4160 was calibrated using the normal cal procedure: a short circuit, an open circuit and a 49.9 ohm chip resistor. The same calibration data was used for all the tests. The test loads connected to the AIM4160 were made using standard components from Mouser and Digikey. The components were used directly from the package. The loads were not adjusted using laboratory equipment.  
The following table shows the construction details of the loads used for this series of tests.
The ideal value of each load is shown in the first column of the table below. The expected value of impedance based on the component values specified in the catalog is shown in italics below the ideal value. All the resistor are surface mount size 0805 1% metal film.
 
Load  Part Number  Comments 
5 ohm  Digikey RHM10.0CCT 1% metal film  two 10 ohm resistors in parallel 
25 ohm  Digikey RHM49.9CCT  two 49.9 ohm resistors in parallel 
50 ohm  Digikey RHM49.9CCT  
100 ohm  Digikey RHM100CCT  
200 ohm  Digikey RHM200CCT  
1K ohm  Digikey RHM1.00KCCT  
50  j50 @ 3.5MHz (ideal=49.9  j49.4)  49.9 ohms 1% Digikey RHM49.9CCT +  Capacitors are 100V COG with leads. Two caps in parallel = 920pF. 
50  j50 @ 14MHz (ideal=49.9  j51.7)  49.9 ohms 1% Digikey RHM49.9CCT +  Capacitors are 100V COG with leads. Two caps in parallel = 220pF. 
50  j50 @ 28MHz (ideal=49.9  j49.4)  49.9 ohms 1% Digikey RHM49.9CCT +  Capacitors are 100V COG with leads. Two caps in parallel = 115pF. 
For the 50 + j50 loads, the resistive component is the sum of a fixed resistance and the specified coil resistance. For all three loads shown below, the fixed resistance is 48.7 ohms. The specified resistance of the coil is added to this to get the ideal value.  
50 + j50 @ 3.5MHz (ideal=50.9 + j49.4) 

Coil series resistance = 2.2 ohms. Total resistance = 50.9 ohms Total inductance = 2.25uH 
50 + j50 @ 14MHz (ideal=50.0 + j50.6) 

Coil series resistance = 1.3 ohms. Total resistance = 50.0 ohms Total inductance = 575nH 
50 + j50 @ 28MHz (ideal=49.6 + j50.1) 

Coil series resistance = 0.9 ohms. Total resistance = 49.6 ohms Total inductance = 285nH 

Updated: June 22, 2006