Model 3301 Calibration with a 3301CAL Fixture
2
Model 3301 Calibration with a 3301CAL Fixture © Copyright 2007–2009 by ETS-Lindgren L.P. All Rights Reserved. No part of this document may be copied by any means without written permission from ETS-Lindgren L.P. The logo is a trademark of ETS-Lindgren L.P. ETS-Lindgren www.ets-lindgren.com www.ets-lindgren.com 399806, Rev C The incorporates a resistive network and a 10-picofarad capacitor to perform the Equivalent Capacitive Substitution Method (ECSM) of calibration for rod antennas. The allows for accurate reading of the input to the 3301CAL, and the capacitor feeds the amplifier through the same impedance as the rod. ETS-Lindgren 3301CAL Calibration Fixture T T Example: The input read from the 3301CAL receiver port is 50 dBμV. 1. The output read from the Model 3301 output port is 59 dBμV. 2. The antenna factor is the input plus the combined fixture loss and effective height correction factor, minus the output. Assuming a reading is taken with a 1-MHz signal input to the 3301CAL and a combined correction factor of 11 dB: 3. 50 dBμV + 11 dB (1/m) - 59 dBμV = 2 dB (1/m) Connect the 3301CAL to the Model 3301 antenna by inserting the mounting stud on the fixture into the rod element mounting hole on the antenna; rotate to tighten. 1. Connect the 3301CAL ground to one of the counterpoise mounting screws on the Model 3301. 2. Place a signal source on the signal generator port of the 3301CAL and a receiver on the receiver port. 3. Terminate the output of the Model 3301 with 50 , and record the input signal strength. Ω 4. Compensate for test fixture and effective height of antenna: The receiver port on the 3301CAL has a 5 dB loss in signal strength from the mounting stud due to the resistor network in the fixture. In addition, the effective height of the 1.04-meter monopole is 0.5 meters; this adds a 6 dB correction factor, making the combined correction factor 11 dB. 5. Move the receiver cable to the output port on the Model 3301, and then place a 50 load on the receiver port of the 3301CAL. Ω 6. Read the output signal. The antenna factor is the input signal (read from the receiver port on the 3301CAL) plus the combined correction factor of 11 dB, minus the output signal (read from the output port on the Model 3301). Both readings are assumed to be logarithmic. 7. USA Headquarters 1301 Arrow Point Drive Cedar Park, TX 78613 Phone: (512) 531-6400 [email protected] Please see f www.ets-lindgren.com or a list of all ETS-Lindgren offices. Warranty Information For complete warranty information, see the and/or the Model 3301 user manual Product Information Bulletin . Safety Information Before connecting components, read on the back page of this document. Safety Information Revision/Date: B, Rebrand – June, 2008 A, Initial Release – October, 2007 C, Update step 5; photos – May, 2009 ONLY QUALIFIED PERSONNEL should install, operate, or service this equipment. CONTACT ETS-LINDGREN PRIOR TO SERVICING. Servicing (or modifying) the unit by yourself may void your warranty. If you attempt to service the unit by yourself, disconnect all electrical power before starting. There are voltages at many points in the instrument that could, if contacted, cause personal injury. Only trained service personnel should perform adjustments and/or service procedures upon this instrument. Capacitors inside this instrument may still be CHARGED even when instrument is disconnected from its power source. WARRANTY For complete safety information, see the and/or the Model 3301 user manual. Product Information Bulletin Insert mounting stud into rod element mounting hole and rotate to tighten Connect ground to counterpoise mounting screw Receiver port Signal generator port
Transcript of Model 3301 Calibration with a 3301CAL Fixture
Model 3301 Calibration with a 3301CAL Fixture
© Copyright 2007–2009 by ETS-Lindgren L.P. All Rights Reserved. No part of this document may be copiedby any means without written permission from ETS-Lindgren L.P.
The logo is a trademark of ETS-Lindgren L.P.ETS-Lindgren
www.ets-lindgren.com www.ets-lindgren.com399806, Rev C
The incorporates a resistive network and a
10-picofarad capacitor to perform the Equivalent Capacitive Substitution Method (ECSM)
of calibration for rod antennas. The allows for accurate reading of the input to the
3301CAL, and the capacitor feeds the amplifier through the same impedance as the rod.
ETS-Lindgren 3301CAL Calibration Fixture T
T
Example: The input read from the 3301CAL receiver port is 50 dBμV.1.
The output read from the Model 3301 output port is 59 dBμV.2.
The antenna factor is the input plus the combined fixture loss and effective height
correction factor, minus the output. Assuming a reading is taken with a 1-MHz
signal input to the 3301CAL and a combined correction factor of 11 dB:
3.
50 dBµV + 11 dB (1/m) - 59 dBµV = 2 dB (1/m)
Connect the 3301CAL to the Model 3301 antenna by inserting the mounting stud on the
fixture into the rod element mounting hole on the antenna; rotate to tighten.
1.
Connect the 3301CAL ground to one of the counterpoise mounting screws on the Model 3301.2.
Place a signal source on the signal generator port of the 3301CAL and a receiver on the
receiver port.
3.
Terminate the output of the Model 3301 with 50 , and record the input signal strength.Ω4.
Compensate for test fixture and effective height of antenna: The receiver port
on the 3301CAL has a 5 dB loss in signal strength from the mounting stud due to the
resistor network in the fixture. In addition, the effective height of the 1.04-meter monopole
is 0.5 meters; this adds a 6 dB correction factor, making the combined correction factor 11 dB.
5.
Move the receiver cable to the output port on the Model 3301, and then place a
50 load on the receiver port of the 3301CAL.Ω
6.
Read the output signal. The antenna factor is the input signal (read from the receiver port
on the 3301CAL) plus the combined correction factor of 11 dB, minus the output signal
(read from the output port on the Model 3301). Both readings are assumed to be logarithmic.
7.
USA Headquarters1301 Arrow Point DriveCedar Park, TX 78613Phone: (512) [email protected]
Please see
f
www.ets-lindgren.com
or a list of all ETS-Lindgren offices.
Warranty Information
For complete warranty information, see the and/or the Model 3301 user manualProduct Information Bulletin .
Safety Information
Before connecting components, read on the back page of
this document.
Safety Information
Revision/Date:
B, Rebrand – June, 2008
A, Initial Release – October, 2007
C, Update step 5; photos – May, 2009
ONLY QUALIFIED PERSONNEL should install, operate, or service this equipment.
CONTACT ETS-LINDGREN PRIOR TO SERVICING. Servicing (or modifying) the unit by yourselfmay void your warranty. If you attempt to service the unit by yourself, disconnect all electrical powerbefore starting. There are voltages at many points in the instrument that could, if contacted, causepersonal injury. Only trained service personnel should perform adjustments and/or service proceduresupon this instrument. Capacitors inside this instrument may still be CHARGED even when instrument isdisconnected from its power source.
WARRANTY
For complete safety information, see the and/or the Model 3301 user manual.Product Information Bulletin
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