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Author Topic: check swr on 2m  (Read 2360 times)
KF5FGQ
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Posts: 1




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« on: September 30, 2011, 07:12:21 AM »

Ive installed a icom 208h in my jeep with a jetstream dual band antenna.
my question is how do you check swr
 on 2m fm with no carrier?

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N6AJR
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Posts: 9908




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« Reply #1 on: September 30, 2011, 08:41:37 AM »

2 meter FM will give you 100% power , what ever you have the radio set for.  So if you have a meter and key up in FM mode, what ever it reads is accurate enough with in the tolerance of the meter.  Most of the time a 2m/440 MHz store bought antenna will be set good from the factory.  In ssb there is no carrier so your voice runs the power in the relationship of the peaks of your voice.  Also the meter needs a  bit of time to catch up with the  voice peaks so you will hear folks either whistling or saying helloooooooooooo or audiooooooooo to get an idea of the power in ssb mode.  Sending a string of Dits in cw mode will give you a fairly close  reading but is actually only a bout a 50% signal.  so go to FM and key, the meter reading for FM  or RTTY mode is constant carrier, and will give you a fairly accurate reading.
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N6AJR
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« Reply #2 on: September 30, 2011, 08:44:29 AM »

all into a dummy load, of course.
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N6AJR
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« Reply #3 on: September 30, 2011, 08:42:27 AM »

all into a dummy load, of course.
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M6GOM
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Posts: 899




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« Reply #4 on: September 30, 2011, 01:44:43 PM »

How does transmitting into a dummy load help when checking the SWR of the antenna?
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N6AJR
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Posts: 9908




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« Reply #5 on: October 01, 2011, 10:31:04 AM »

Well, test the meter into a dummy load and test the antenna on the air.   OOps.............."Smiley
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KQ6Q
Member

Posts: 976




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« Reply #6 on: October 04, 2011, 12:11:04 PM »

On 2m and 440, the stock antenna bandwidth is wide enough, and the  cable run is short enough, that you don't worry about SWR.
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