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Re: SWR Meter on 2m / 70cm


 

Hi the swr meter does not work on VHF/UHF
Dave 2E0DMB


On Tue, 9 Jul 2024, 21:34 VA6GT via , <va6gct=[email protected]> wrote:
I was at another fellow hams residence and since he had the equipment, I thought it would be a good idea to double check my antenna, coax etc.? What is confusing is that he has both an old-school power meter (which was showing significant return power on my antenna run) and antenna analyzer (also showing higher SWR at needed frequencies), neither which coincide with what shows on the ic-7000 radio display SWR meter when I xmit.

Then I read this in the manual....

The IC-7000 has a built-in circuit for measuring antenna SWR—no external equipment or special adjustments are necessary.? The IC-7000 can measure SWR in 2 ways - spot measurement and plot measurement.? The SWR can only be measured on [ANT1] connector, in the HF/50 MHz bands when an antenna is connected. However, when a 144/430 MHz antenna is connected to [ANT2], the SWR cannot be measured.

Does this mean that when transmitting on 2m/70cm, even though the SWR meter "moves", it is not really accurate or reading anything meaningful?? ?I've been assuming I had a good antenna run, but now I am doubtful (though it does seem to be working).? I realize that the "graph" SWR meter does not work on 2m/70cm, but always assumed the spot meter was true...

I've ordered a NanoVNA to do some additional testing.? Any other reasons you can suggest that would cause the discrepancies?? ?I did the standard multimeter tests for continuity etc while bending, twisting, and moving the coax etc...everything "seems" OK at the DC level.??

Grant? VA6GT

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