Inbuilt swr meter on 2970n series

[Limeybastard]

Just quick one if I may.
I have two swr meters, one gives me higher values for example ch1 2.5 and ch40 3.5 whereas the other swr meter gives me lower figures, ch1 1.5 ch40 2.0

I don't know which one to believe in, however would i be correct in thinking if I press the swr button on the radio and check on AM via the Ranger display not showing any 'bars' im good to assume that the swr meter giving me the lowest figures is the one working correctly?

I've learned that inbuilt swr meters dont work, but if the swr is high surely it would and should give me a reading on the radios display?

 

[Road Squawker]

Old Chinese proverb...............

Man who has 2 SWR meters never knows correct SWR

 

[fourstringburn]

Get a tuner with a SWR meter. If you don't like what you see, tune it !

 

[midnight special]

that is why i own a mfj 259,,,,

 

[undertaker]

me to!!!!

 

[nomadradio]

I tell customers not to use a radio's built-in SWR meter to tune an antenna. It's just not built for accuracy. None of them are that I have seen.

But I tell the truck drivers to check the SWR before heading out for the day. Whatever reading you got last time should be the reading you get this time. You don't need accuracy to check for a damaged antenna/feedline/connector.

Just a consistent error from day to day. If the reading changes, don't transmit more than you need to until a real meter gets put in line, and the problem fixed.

73

 

[Limeybastard]

I wasnt using the inbuilt swr meter to tune it, was merely wanting to know if swr was in res zone would the inbuilt swr meter show me shit? Not sure if I'm expecting much, but thought at least the inbuilt one would show me a bar or two or three if swr was high?

 

[nomadradio]

Only way I know to tell is with a "SWR Load". A 100-ohm (2-to-1 SWR) or 150-ohm (3-to-1) 5-Watt carbon-film resistor inside a PL259. Never hurts to check one of these with a proper antenna analyzer first, but if the radio's internal meter doesn't say something near 3-to-1 with a 150-ohm resistor for its load, that's a hint.

This is what we use to set the SWR warning light in a radio that has that feature.

73

 

[Limeybastard]

Well anyways another spanner in the works, both swr meters show my magmount that is on my truck as almost flat , weird. So, I guess one SWR meter being faulty is out of the equation LOL.

 

[9C1Driver]

This should solve the problem. With this you don't even have a radio in-line when testing/tuning the antenna. Once your done it's good to go as long as you don't move the antenna on the vehicle. https://www.gigaparts.com/mfj-259c.html?gclid=CPL50-LE9dQCFdq3wAoduCMNgQ

 

[Limeybastard]

This should solve the problem. With this you don't even have a radio in-line when testing/tuning the antenna. Once your done it's good to go as long as you don't move the antenna on the vehicle. https://www.gigaparts.com/mfj-259c.html?gclid=CPL50-LE9dQCFdq3wAoduCMNgQ

Cheers, there goes my wifes boob job.

 

[TM86]

Cheers, there goes my wifes boob job.

A boob job that cheap? Must have one heck of a coupon.