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Author Topic: I have low swr but antenna won't load  (Read 1692 times)
KD8LZT
Member

Posts: 1




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« on: June 17, 2011, 07:19:31 AM »

I have a 148T20 cross polarization beam from a silent key.  Just replaced the "redi-matches" and still have the same problem.  The MFJ analyzer says I have a swr of 1:1.5 at 147 but when I transmit with 100 watts only show 50 watts going to the antenna but at the same time no reflected power.

Same meter and transmitter into a vertical shows full 100 watts out about 5 watts reflected.

Can anyone help me with some suggestions?

Thanks in advance,

Bob KD8LZT
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KB1GMX
Member

Posts: 780




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« Reply #1 on: June 17, 2011, 12:04:39 PM »

sounds like either your MFJ is out of calibration or you have a bad piece of cable in the bunch.

Keep in mind for the 50W case you give the SWR is perfect, that is none reflected.  While good that
sounds inconsistent with the MFJ telling you 1.5:1! 

Whats different?

Cables used including jumpers?


Allison
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KI4SDY
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Posts: 1452




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« Reply #2 on: June 17, 2011, 08:01:57 PM »

Put a 50 Ohm dummy load on the end of the antenna. If it reads more than 1/1, you have a coax and or connector problem. Did you install the connectors? If so, they are suspect and a good place to start!  Wink 
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G8YMW
Member

Posts: 237




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« Reply #3 on: June 22, 2011, 05:23:43 PM »

Are you using the same cable on the 2 aerials? If not, try it . My thoughts is corrosion on the coax making the coax lossy thus giving a false "low SWR " reading.
Try running the coax into a dummy load and (using the same meter) compare readings at either end of the coax.
Hardly any difference says coax OK, big difference says coax knackered
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73 details Tony
Sent by WW2 Royal Navy signal lamp
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