Capacitive Hats: Magic or Snake Oil?
Автор: LB4FH portable radio
Загружено: 2025-12-16
Просмотров: 397
Описание:
Capacitive hats for portable whip based antennas like the MA-12 and JPC-12 are sold pretty much everywhere you can buy radio equipment now. Are they any good though? In this video I test the same antenna using WSPR with and without the capacitive hat on the same bands within a short period of time to see if the numbers can give us any results.
You're welcome to join The European Ham Radio Show (TEHRS) discord at https://hamshow.eu/discord
00:00 Introduction
02:00 Unboxing and first look
04:14 Practicalities
06:40 Initial observations
07:04 More mounting details
08:08 Comparing with NanoVNA
08:59 More observations
10:59 Dutch submarine sails by (not related to test)
11:04 Summary in field
11:40 Looking at the numbers
12:22 Jupyter notebook explanation
13:32 Average SNR
14:46 Number of reports
15:11 Average distance
16:04 SNR difference for stations that heard both with and without hat
17:00 Normal distribution plot
17:28 Maps
18:36 Summary
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