


The TCTNHV transformer is assembled in an aluminum enclosure with a 3.38" diameter clearance hole for the antenna conductor. This large clearance enables operation with conductor voltages as high as 28 kV peak (20 kV_{RMS}). A 0.75 to 1.0" diameter tubular conductor centered in the clearance hole provides maximum voltage capability. Corona rings which increase the TCTNHV voltage rating by approximately 5% are available as a factory installed option.
The TCTNXHV transformer is assembled in a rectangular aluminum enclosure with a 6.0" diameter clearance hole for the antenna conductor. This large clearance enables operation with conductor voltages as high as 60 kV peak (42.4 kV_{RMS}). A 2.0 to 2.25" diameter tubular conductor centered in the clearance hole provides maximum voltage capability.
Several versions of the TCT transformer are available for different RF current sampling requirements. The TCT1, TCT1HV and TCT1XHV transformers provide 0.5 V_{RMS} across a 50 ohm external load for each Ampere of current flowing in the antenna conductor. These models are rated for currents up to 40 A_{RMS}. The TCT2, TCT2HV and TCT2XHV transformers provide a 0.25 V_{RMS}/Ampere sample across a 50 ohm external load and are rated for currents up to 80 A_{RMS}. The TCT3 and TCT3HV transformers provide a 1.0 V_{RMS}/Ampere sample across a 50 ohm external load and are rated for currents up to 20 A_{RMS}. The TCT4, TCT4HV and TCT4XHV transformers and the TCT5, TCT5HV and TCT5XHV transformers are high output, unterminated units which are used only with the 5, 10, 5/10, 5/20, 10/20 and 10/40 Ampere TCA RF Ammeters and with the 10 and 20 Ampere DTCA Digital RF Ammeters. The TCT7HV and TCT6XHV transformers provide a 0.125 V_{RMS}/Ampere sample across a 50 ohm external load and are rated for currents up to 160 A_{RMS}.
The TCT1 and TCT2 may be used in the same directional antenna system since they have identical phase and magnitude tracking characteristics. The TCT3 transformer has different characteristics and should not be mixed with the other two models. The TCT1HV and TCT2HV may be used in the same directional antenna system since they have identical phase and magnitude tracking characteristics. The TCT3HV transformer and the TCT7HV transformer have different characteristics and should not be mixed with the other models. All TCTNXHV transformers may be used in the same directional antenna system since they have identical phase and magnitude tracking characteristics. The TCTN series of transformers should not be mixed with the TCTNHV or TCTNXHV transformers due to the differences in the toroid inductors used in each design. Similarly, the TCTNHV series of transformers and the TCTNXHV series of transformers should not be mixed with the other series of transformers due to the difference in the toroid inductors used in each design.
Model:  TCTN  TCTNHV  TCTNXHV 

Frequency Range:  0.5 to 2 MHz  0.5 to 2 MHz  0.5 to 2 MHz 
Sensitivity*: (Volts/Ampere) 
TCT1: 0.5 TCT2: 0.25 TCT3: 1.0 TCT4: 1.0 TCT5: 2.0 
TCT1HV: 0.5 TCT2HV: 0.25 TCT3HV: 1.0 TCT4HV: 1.0 TCT5HV: 2.0 TCT7HV: 0.125 
TCT1XHV: 0.5 TCT2XHV: 0.25 TCT4XHV: 1.0 TCT5XHV: 2.0 TCT6XHV: 0.125 
Source Impedance:  50 Ohms  50 Ohms  50 Ohms 
Current Range: (Amps) 
TCT1: 0  40 TCT2: 0  80 TCT3: 0  20 TCT4: 0  20 TCT5: 0  10 
TCT1HV: 0  40 TCT2HV: 0  80 TCT3HV: 0  20 TCT4HV: 0  20 TCT5HV: 0  10 TCT7HV: 0  160 
TCT1XHV: 0  40 TCT2XHV: 0  80 TCT4XHV: 0  20 TCT5XHV: 0  10 TCT6XHV: 0  160 
Absolute Magnitude Accuracy:  ±2%  ±2%  ±2% 
Absolute Phase Accuracy†:  TCT1 & TCT2: ±2º TCT3: ±3º 
TCT1, 2 & 7HV: ±2º TCT3HV: ±3º 
TCT1, 2 & 6XHV: ±2º 
Magnitude Tracking Accuracy:  ±1%  ±1%  ±1% 
Phase Tracking Accuracy†:  TCT1 & TCT2: ±0.5º TCT3: ±1º 
TCT1 & 2HV:
±0.5º TCT3 & 7HV: ±1º 
TCT1, 2 & 6XHV: ±1º 
Insulation:  14 kV peak (10 kV_{RMS}) Optional TCALS8 or TCALS11 line section increases voltage rating to 21 kV peak (15 kV_{RMS}) 
28 kV peak (20 kV_{RMS}) Optional corona rings (standard on TCT7HV) increase voltage rating 5% 
60 kV peak (42.4 kV_{RMS}) 
Electric Field Rejection:  >100 dB  >100 dB  >100 dB 
Dimensions: (W x H x D) Inches cm 
5.25 x 5.75 x 2.25 13.3 x 14.6 x 5.7 
6.25 x 7.25 x 2.25 15.9 x 18.4 x 4.7 
12.75 x 12.00 x 3.00 32.4 x 30.5 x 7.6 
Weight: Pounds kg 
3.5 1.6 
5.5 2.5 
17 7.7 
Order Numbers:  923000100N where N = 1,2,3,4 or 5 
923000300N where N = 1,2,3,4, 5 or 7 
923000400N where N = 1,2,4,5 or 6 
* When terminated in external 50 ohm load. Other sensitivities and corresponding RF Ammeter current ranges available on special order.  
† The
Model TCT4, TCT5, TCT4HV, TCT5HV,
TCT4XHV and TCT5XHV toroidal current transformers are supplied only
with the Model TCA5, 10, 5/10, 5/20, 10/20, and 10/40 RF Ammeters
and with the Model DTCA10 and 20 Digital RF Ammeters and are not
characterized for absolute phase accuracy and
for phase tracking accuracy. 
Delta Electronics, Inc. 5730 General Washington Drive P. O. Box 11268 Alexandria, VA 22312 
Phone: (703) 3543350 U.S. Toll Free: 18008DELTA8 (18008335828) Fax: (703) 3540216 www.deltaelectronics.com Email: sales@deltaelectronics.com 
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