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If i tune my newly installed CB antenna passively w/ a nanoVNA (let's say to minimize SWR for channel 19), do i still need to verify SWR with an in-line meter while transmitting? Wondering if that's a 'must do'
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antenna install....passive vs. active SWR?
- Thread starter IQ_imbalance
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mmckenna
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It's the same thing, no need to do it twice.
However, just to cover all the bases and someone who will want to go into detail, testing it under actual transmitter output power may show some faults that would not show up with the low power output of the NanoVNA. But, it's unlikely a 4 watt CB is going to show anything that the NanoVNA will not.
The NanoVNA is going to give you a lot more usable information than a simple SWR meter will.
However, just to cover all the bases and someone who will want to go into detail, testing it under actual transmitter output power may show some faults that would not show up with the low power output of the NanoVNA. But, it's unlikely a 4 watt CB is going to show anything that the NanoVNA will not.
The NanoVNA is going to give you a lot more usable information than a simple SWR meter will.
G7RUX
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Both methods should give the same results, up to general accuracy.
However, as mentioned the performance of an antenna system can change at different power levels, with heating and flashover becoming more possible as the power levels increase.
Should you do both? There’s no reason why you shouldn’t really and measuring by two methods is quite a wise general approach.
As a small observation, the use of a network analyser and a Tx with VSWR meter are largely the same with neither being “passive” per se.
However, as mentioned the performance of an antenna system can change at different power levels, with heating and flashover becoming more possible as the power levels increase.
Should you do both? There’s no reason why you shouldn’t really and measuring by two methods is quite a wise general approach.
As a small observation, the use of a network analyser and a Tx with VSWR meter are largely the same with neither being “passive” per se.
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