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A.H. Systems Model Active Monopole Antennas 

 

 

 

 

©

 A.H. Systems inc

 

REV E 

8

 

 

CALIBRATION 

 

Equivalent Capacitance

 

 
With changes to our Active monopole antenna (converting  the input connection from a  BNC to  a 
more  rugged  ¼-20  input)  our  element  diameter  changed  to  6.17mm  (Average).  It  is  our 
recommendation to use a 12 pF for the ECSM fixture for an element height of 41” (1.04 meter) as 
per ANSI C63.5:2017 and CISPR 16-1-6:2017.  
 
The formula for calculating the capacitance is (per ANSI C63.5:2017 and CISPR 16-1-6:2017): 

 

 

C

a

 = (55.6 

h

) / (ln(

/ a) – 1) * (tan(2 π 

/

λ

)) / (2 π 

/

λ

)

 

Eq 1 

where: 

= actual length of the monopole element (adjusted to 1.04m), m 

= average radius of the antenna element (6.17mm), m 

λ

 = wavelength in meters 

C

a

 = capacitance of the dummy load 

 
NOTE - Other fixtures with different capacitance are available as an option. 
 
 

Effective Height Calculation 

 
The correction factor for the calibration is dependent on the height of the monopole. The effective 
height is calculation is: 

 

 

h

e = 

(

λ

/ 2π)

 * tan(2 

π 

/

λ

)

 

Eq. 2 

where: 

 

λ

 

= wavelength in meters 

 

h

 = Telescoping element height in meters 

 
Examples: 
 

 

For a 41” (1.04 Meter) length, the effective height would be 0.52 meters (up to approximately 
2 MHz) and the correction factor should be 20*Log(

0.52

) = -5.68 dB. 

 

 

For a 1 Meter length, the effective height would be 0.5 meters (up to approximately 2 MHz) 
and the correction factor should be 20*Log(

0.5

) = -6.02 dB. 

 
 
 

 

 

Содержание SAS-550-1B

Страница 1: ...A H Systems Model Active Monopole Antennas A H Systems inc REV E 1 Active Monopole Antennas User Manual...

Страница 2: ...Monopole Antennas A H Systems inc REV E 2 TABLE of CONTENTS Introduction 3 Safety Instructions 4 Specifications 5 Operating instructions 6 Calibration 8 Accessories 10 Maintenance 11 Troubleshooting 1...

Страница 3: ...r Description SAS 550 1B 9 kHz 60 MHz 2380 Active Monopole Antenna Battery Powered SAS 550 2B 100 Hz 60 MHz 2381 Active Monopole Antenna Battery Powered Included parts Antenna Base with ground plane T...

Страница 4: ...cordance with all applicable laws and regulations 4 To protect against electric shock do not immerse the power cord power plug or Antenna in water or in any other liquid 5 Do not operate the product w...

Страница 5: ...compatible with the receiver impedance ANTENNA SPECIFICATIONS SAS 550 1B Active Monopole Antenna specifications Frequency Range 9 kHz 60 MHz Antenna Factor 0 dB m Flatness 0 5 dB from 20 kHz 30 MHz 5...

Страница 6: ...will not damage the battery Using the battery charger to operate the amplifier directly is not recommended Longest life and best performance can be obtained if the battery is charged when the air tem...

Страница 7: ...des good reception with a minimal need for space Its flat 0 dB antenna factor makes it a convenient choice when calculating the field intensity The signal field strength is the receiver voltage in dB...

Страница 8: ...the monopole element adjusted to 1 04m m a average radius of the antenna element 6 17mm m wavelength in meters Ca capacitance of the dummy load NOTE Other fixtures with different capacitance are avail...

Страница 9: ...nal voltage VD in dB V at the T connector A Also referred to as a Dummy Antenna Figure 2 2 Leaving the RF output of the signal generator unchanged transfer the 50 termination to the T connector A and...

Страница 10: ...able assembly providing repeatable reliable performance for use in a variety of commercial and industrial applications SAC 461F Cable kit for MIL STD 461 An optional cable kit is available to comply w...

Страница 11: ...ll soft brush REPLACING THE BATTERY ASSEMBLY Turn off and unplug the unit before changing the battery pack assembly 1 Remove the four 6 32 flat head screws from the bottom of the ground plane 2 Discon...

Страница 12: ...you still carry this part A Yes the telescoping rod with a BNC connector P N 2337 1 is for our older active monopole antennas All new active monopole antennas have been re designed to accept a telesco...

Страница 13: ...tery pack will not charge Bad battery pack Replace battery pack assembly Charger has no output Re connect charger Charger not plugged in Replace battery pack assembly Low response No gain Front end da...

Страница 14: ...the warranty period commencing with the delivery of the product by A H Systems The remedy set forth herein shall be the only remedy available to the buyer and in no event shall A H Systems be liable...

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