SW-33PLUS | SURECOM | VHF/UHF | 100W POWER & S.W.R. METER | POWER METER ...

SW-33PLUS
SURECOM SW-33PLUS VHF/UHF 100W POWER & S.W.R. METER
https://www.surecom.com.hk/product-page/sw-33plus-vhf-uhf-100w-power-s-w-r-meter


 
Features: 
1 V.S.W.R. Forward  power direct digital readout, without any calibration. 
2 V.S.W.R. REW  power direct digital readout, without any calibration. 
3. Maximum measurable power range up to 100W. 
4. 3 seconds check your antenna SWR , also check your radio RF power watt.
5.Easy to install handheld Radio 
Specifications: 
Measurable power range: 0.1-100W 
Maximum power: 100W 
Accuracy: mean + / - 5% 
* Not for the DMR digital radio. 
Specifications:
MAX. Power in    100 WATT
V.S.W.R    1.00:1~19.99:1
Frequency Range    125MHz~525MHz
Insertion Loss    < 0.15dB(VHF) , < 0.25dB(UHF)
Temperature    0℃~70℃
Battery Build -in     3.7V Li-ion Battery  
Size(WHIT OUT SMA    25*25*60 (mm)
Power  in     5V (micro usb)
Interface (in and out )    SMA female
Impedance:     50Ω    
Weight    160g　
Features function 
Push red button and hold 2 sec. to" Power on " and "ALL "mode " LCD display show sw33_swrmode
Push red button -" 90° "mode , LCD display show   sw33_swrmode
Push red button -" 180° "mode, LCD display show sw33_swrmode 
Push red button -" V.S.W.R. "mode ,LCD display show sw33_swrmode
Push red button -" FW POWER "mode ,LCD display show sw33_swrmode
Push red button and HOLD  -" POWER OFF
1.1How to use Power meter (forward)
Push red button -switch on
Push red button  at four times to mode "POWER meter "  ,LCD display show  sw33_swrmode
Connect the SMA (mark TX)  to Radio output .
Connect the SMA to DUMMUY Load 
Caution : Please use correct dummy load , High power will damage the dummy load.
1.2 How to measure SWR?
All forms of SWR meters measure SWR, standing wave ratio on a transmitter feeder. Using SWR meter is relatively easy, but one should be able to interpret the results when using it. In general, VSWR and SWR are the same.
When using VSWR meters to measure the the performance of a new antenna, always one should prefer to use  up to 3W  power and a clear channel. The following procedure can be used to use the meter.
Push red button  at two times to mode "V.S.W.R. meter "  ,LCD display show sw33_swrmode
Connect the SMA (mark TX) to Radio output .
Connect the SMA (mark Ant) to ANTENNA 
When the the LCD  show 1.00 to 1.50   , 1.0~ 1.5:1 mean the antenna is suit the frequency. 
When the the LCD  show 1.50 to 3.00 ​ , 1.5~ 3.0:1 mean the antenna is not good  suit the frequency.
When the the LCD  show 5.00 to 19.99​  ,5.0~19.99:1 mean the antenna is not  suit the frequency.
 
The VSWR meter is connected in the feeder from the transmitter to antenna. For the feeder convenience, SWR meter is located at the transmitter end of the feeder. This helps to monitor the actual VSWR values.
One should know, where exactly SWR can be measured. There is always some degree of feeder loss, which has a major effect on the VSWR readings.
Feeder loss absorbs power in both directions. When the reflected signal is reduced, there is a high level of feeder loss. The reflected signal gets reduced as a forward signal to the antenna, later it’s reflected back to the transmitter.
Since the signal is reduced on its way to the transmitter, an antenna with poor match and high VSWR will be fine at the transmitter. Hence, when a feeder that induces a high loss is used, VSWR is good at the transmitter, but at the antenna, it may be poor.
SWR Formulas and Calculations
VSWR can be calculated from various parameters. By definition, VSWR is given as ratio of maximum voltage on the line to the minimum voltage.

https://www.surecom.com.hk/product-page/sw-33plus-vhf-uhf-100w-power-s-w-r-meter