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What are the technical specifications for the TELEWAVE 44L1 Broadband RF Wattmeter?
The specifications for the TELEWAVE 44L1 are as follows:
| Parameter | Characteristics |
| Frequency Range | 2 to 200 MHz |
| Accuracy | ± 7 percent of full scale (Specified with N connectors only) |
| Power Ranges | 5, 15, 50, 150 and 500 Watts |
| Primary Line Impedance | 50 Ohms nominal |
| VSWR | 1.1 maximum |
| Insertion Loss | 0.1 dB maximum |
| RF Sample Port (44L1P) | -40 dB +/- 2 dB |
| RF Connectors | QC – “Quick-Change” type |
| Standard | N-Female |
| Optional | UHF, BNC, TNC, 7-16 DIN M/F |
| Dimensions | |
| Height | 6.625 in. (16.83 cm) |
| Width | 4 in. (10.16 cm) |
| Depth | 3.25 in. (8.26 cm) |
| Weight | 3 lb. (1.36 kg) |
What are the key features of the TELEWAVE 44L1 wattmeter?
The TELEWAVE 44L1 wattmeter includes the following features:
• Displays five power ranges
• Measures 1 to 500 watts
• Does not require inserts
• Does not require band switching
• Fully operable in freezing conditions
• Provides 5 watts full scale range
• Interchangeable connectors (QC)
• Lightweight, rugged and easy to carry
• -40 dB RF sampling port (Model 44L1P)
Can you describe the controls and indicators on the TELEWAVE 44L1?
| Key | Item | Description |
| 1 | Carry Strap | For carrying or hanging the instrument. |
| 2 | Identification Label | Contains model and serial number of the instrument. |
| 3 | Meter | Displays measured power. |
| 4 | Sample Port | Connection point for external measurement or signal injection (Model 44L1P). |
| 5 | Input Connector | Connection point for the RF source, such as an RF power amplifier or transmitter. Mates with Type N or UHF connector (typical). |
| 6 | Output Connector | Connection for the RF load, such as an antenna or dummy load. Mates with Type N or UHF connector (typ.) |
| 7 | Mode Switch | (1) OFF – Transit. Provides protection for meter during instrument movement. |
| (2) FWD – Displays forward or incident power. | ||
| (3) REV – Displays the reflected power. | ||
| 8 | Power Range Switch | Selects one of 5 full scale power ranges. |
| 9 | VSWR Chart | Provides a method to calculate VSWR from the measured forward and reflected power. |
What optional accessories are available for the TELEWAVE 44L1?
The following common accessories are available for the TELEWAVE 44L1 Wattmeter:
| Part Number | Description |
| TC44 | Leather carry case with accessory pouch |
| TWL-35 | Coaxial Dry Load – 35 watts |
| TWL-50 | Coaxial Dry Load – 50 watts |
| TWL-60 | Coaxial Dry Load – 60 watts |
| TWL-75 | Coaxial Dry Load – 75 watts |
| TWL-100 | Coaxial Dry Load – 100 watts |
| TWL-150 | Coaxial Dry Bench Load – 150 watts |
| TWL-300 | Coaxial Dry Bench Load – 300 watts |
| QC44B | Quick Change BNC-female connector |
| QC44D | Quick Change 7-16 DIN-female connector |
| QC44N | Quick Change N-female connector |
| QC44S | Quick Change UHF-female connector |
| QC44T | Quick Change TNC-female connector |
| ANTA-02-5 | Jumper – RG-213/U, 5 ft., N-Male |
| ANTD-03-5 | Jumper – RG-142B/U, 5 ft., N-Male |
What should I do when I receive my TELEWAVE 44L1 wattmeter?
After the TELEWAVE 44L1 wattmeter arrives, examine the shipping container for visible loss or damage. Carefully unpack the wattmeter and examine the exterior for damage.
IMPORTANT
Claims for loss or damage sustained in transit should be made upon the carrier, NOT TO Telewave, Inc., as follows:
(1) Visible Loss or Damage – Any evidence must be noted on the freight bill or express delivery sheet. The form required to file such a claim will be supplied by the carrier.
(2) Concealed Loss or Damage – This damage does not become evident until after the wattmeter is unpacked. When the damage is discovered, make a written request for inspection by the carrier’s agent within fifteen (15) days of the delivery date. File a claim with the carrier.
How do I connect the TELEWAVE 44L1 for RF power measurement?
Follow this procedure to prepare for an RF power measurement:
| Step | Procedure |
| 1 | Remove the RF power from the transmission line. |
| 2 | Set the RF Range Switch to the 500 Watt position. |
| 3 | Connect the RF Source to the Model 44L1/L1P FWD input connector, located on the left side of the instrument nearest the mode switch. |
| 4 | Connect the RF Load to the Model 44L1/L1P FWD output connector, located on the right side of the instrument nearest the range switch. |
How do I measure forward (incident) power with the TELEWAVE 44L1?
Follow this procedure to make an incident or forward power measurement:
| Step | Procedure |
| 1 | Set the Mode Switch to the FWD position. |
| 2 | Apply RF power to the transmission line. |
| 3 | Move the RF Range Switch to a lower range if necessary to obtain a reading in the upper third of the scale. |
| 4 | Note the meter reading. |
How do I measure reflected (reverse) power with the TELEWAVE 44L1?
The following procedure will assist in making a reflected or reverse power measurement:
| Step | Procedure |
| 1 | Set the Mode Switch to the REV position. |
| 2 | Apply RF power to the transmission line. |
| 3 | Move the RF Range Switch to a lower range if necessary to obtain a reading in the upper third of the scale, then note the reading. |
How do I calculate VSWR using the TELEWAVE 44L1?
Follow these steps to determine the Voltage Standing Wave Ratio (VSWR):
| Step | Procedure |
| 1 | Perform the procedures for measuring incident and reflected power. Record the true incident and reflected power. |
| 2 | Refer to the VSWR Chart on the rear of the instrument. Apply the readings from Step 1 to the chart. |
| 3 | The VSWR is read from the nearest sloping line. For higher accuracy, calculate the VSWR by the formula:
VSWR = (1 + √(PREV / PFWD)) / (1 – √(PREV / PFWD)) Where PREV is the reflected power in Watts and PFWD is the forward power in Watts. |
How do I calculate the true power at the load using the TELEWAVE 44L1?
Use the following procedure to determine the actual power delivered to the load:
| Step | Procedure |
| 1 | Perform the procedures for measuring forward and reflected power. Record the true incident and reflected power. |
| 2 | Subtract the reflected power from the incident power. This difference is the true power at the load. |
How can I minimize measurement errors when using the TELEWAVE 44L1 with a jumper cable in a high VSWR system?
When the RF load and source are well matched, any error from inserting the wattmeter is negligible. However, using a jumper cable in a system with high VSWR can change the characteristic impedance. To eliminate this error, the jumper cable added to the input or output should be of an appropriate length to equal 1/2 wavelength at the frequency of operation.
The following chart shows the required lengths for a 50-ohm, RG-213 jumper cable (including N connectors, using a velocity factor of 0.66) to act as a 1/2 wave line section at various frequencies. The jumper cable and wattmeter together should equal as close to a 1/2 wavelength equivalent as possible.
| MHZ | INCHES | MHZ | INCHES |
| 25 | 153.23 | 115 | 31.24 |
| 30 | 127.25 | 120 | 29.83 |
| 35 | 108.69 | 125 | 28.53 |
| 40 | 94.78 | 130 | 27.33 |
| 45 | 83.95 | 135 | 26.22 |
| 50 | 75.29 | 140 | 25.19 |
| 55 | 68.21 | 145 | 24.23 |
| 60 | 62.30 | 150 | 23.34 |
| 65 | 57.31 | 155 | 22.50 |
| 70 | 53.03 | 160 | 21.71 |
| 75 | 49.32 | 165 | 20.98 |
| 80 | 46.07 | 170 | 20.28 |
| 85 | 43.20 | 175 | 19.63 |
| 90 | 40.66 | 180 | 19.01 |
| 95 | 38.38 | 185 | 18.42 |
| 100 | 36.33 | 190 | 17.87 |
| 105 | 34.47 | 195 | 17.34 |
| 110 | 32.78 | 200 | 16.84 |
Which potentiometers are used for calibrating the different power ranges on the TELEWAVE 44L1?
The adjustment potentiometers for each power range are identified in the tables below:
| R2 | 5 watt range |
| R6 | 15 watt range |
| R10 | 50 watt range |
| R14 | 150 watt range |
| R18 | 500 watt range |
| R1 | 5 watt range |
| R3 | 15 watt range |
| R7 | 50 watt range |
| R11 | 150 watt range |
| R15 | 500 watt range |
What are the requirements for calibrating the TELEWAVE 44L1?
The following requirements and equipment are necessary for calibration:
a) The ambient temperature during calibration must be 72.4 degrees.
b) The Telewave meter must be calibrated in the intended operating position, either vertical or horizontal. Meters are calibrated by Telewave in the vertical position.
c) The Telewave wattmeter and any interconnections must use only Type N connectors.
d) An RF power source capable of producing at least 325 watts continuous power at 100 Mhz.
e) A low pass filter capable of handling at least the maximum continuous power used during calibration must be installed between the RF source and the Telewave meter.
f) A calibrated digital power meter and remote sensor, with accuracy of +/- 0.5% or better, traceable to NIST. Insertion loss of all test equipment must be characterized.
g) A 50 ohm inline attenuator capable of handling the maximum continuous power that will be used during calibration.
Caution: Do not drive the meter beyond full scale, and do not apply more than 500 watts input power at any time.
What is the procedure for Forward Mode Adjustment of the TELEWAVE 44L1?
To perform the calibration/adjustment, first remove the four bumper screws and the rear panel. Then, follow these steps for Forward Mode Adjustment:
| Step | Procedure |
| 1a | Set the RF source to 100 MHz. |
| 1b | Set the wattmeter Mode Switch to FWD position. |
| 1c | Set the wattmeter RF Range Switch to the 5 watt range. |
| 1d | Set the RF source to 4 watts output. |
| 1e | Adjust R1 until the Telewave wattmeter reads 4 watts. |
| 2a | Set the wattmeter RF Range Switch to the 15 watt scale. |
| 2b | Set the RF source to produce 11 watts output. |
| 2c | Adjust R3 until the Telewave wattmeter reads 11 watts. |
| 3a | Set the wattmeter RF Range Switch to the 50 watt scale. |
| 3b | Set the RF source to produce 35 watts output. |
| 3c | Adjust R7 until the Telewave wattmeter reads 35 watts. |
| 4a | Set the wattmeter RF Range Switch to the 150 watt scale. |
| 4b | Set the RF source to produce 105 watts output. |
| 4c | Adjust R11 until the Telewave wattmeter reads 105 watts. |
| 5a | Set the wattmeter RF Range Switch to the 500 watt scale. |
| 5b | Set the RF source to produce 325 watts output. |
| 5c | Adjust R15 until the Telewave wattmeter reads 325 watts. |
What is the procedure for Reverse Mode Adjustment of the TELEWAVE 44L1?
Follow these steps for Reverse Mode Adjustment:
| Step | Procedure |
| 6a | Disable the RF source output. |
| 6b | Set the wattmeter Mode Switch to REV position. |
| 6c | Reverse the wattmeter RF connections in the RF line. |
| 6d | Repeat Steps 1c through 5c from the Forward Mode Adjustment for the 5, 15, 50, 150 and 500 watt ranges, using adjustment points R2, R6, R10, R14, and R18. |
| 6e | Reinstall the rear panel and bumper screws. |
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