WEEK 2: VSWR

Question 1

If the antenna transmission line (co-ax) is open circuit what VSWR or SWR would be measured?

Answer 1

1:5

Question 2

How much impedance on a co-ax?

Answer 2

50ohms

Question 3

What are the 3 possible areas for faults?

Answer 3

Bad transmission
Ban Antenna
Bad Co-ax

Question 4

The TDR can only test what?

Answer 4

Transmission line only

Question 5

When testing VSWR, if you put the Wattmeter at the ANT and it passes at the ANT but fails at the Comm, what is faulty?

Answer 5

Transmission Line/ Co-ax is faulty

Question 6

When testing VSWR, if it fails at both the ANT and the Comm, what is faulty?

Answer 6

The Antenna

Question 7

What are the frequencies that you test the VSWR on?

Answer 7

118MHz, 126.5MHz, 136.975Mhz

Question 8

If the antenna transmission line (co-ax) is a perfect circuit what VSWR or SWR would be measured?

Answer 8

1:1

Question 9

What is the maximum exception for a VSWR or SWR measured?

Answer 9

2:1

Question 10

If the antenna transmission line (co-ax) is a good circuit what VSWR or SWR would be measured?

Answer 10

1.2:1 to 2:1

Question 11

How do you set up the Wattmeter to test VSWR?

Answer 11

Connect Comm radio to one side of wattmeter and the Antenna coax to the other side of wattmeter

Question 12

How do you do the test for VSWR on a Wattmeter?

Answer 12

Radio on, wattmeter set to read fwd pwr, then transmit, then reflected pwr then use formula

Question 13

What is swept mode?

Answer 13

Sweeps the entire frequency range and measure VSWR