On Fri, Feb 16, 2024 at 08:15 PM, Hans Summers wrote:
Hello Bojan
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With the LPF sweep I suspect that the chosen output power is too much for the LPF test as it is obvious that half of the sweep goes into the filtered zone.
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Please could you explain? I didn't understand what you're getting at?
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Hi Hans,
well, perhaps I did not explain my observations well.
When doing the SWR scans we transmit a preset portion of RF power into a load/antenna. In my case it is 45%. And the scan stops before the LPF begins to attenuate. Here, on the other hand, when doing the LPF scan we transmit over 1W of RF power thru the LPF into a load but up to the frequencies which are well beyond the cut-off of the LPF. So, most of the scan time we get great VSWR. I get quite a current increase (up to the current limit) when that happens. I feel the 1/4 of full RF power is too much for such a measurement.
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73 Bojan S53DZ
