Aliexpress 40m Band Pass Filter

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Testing the 200W 7MHz band pass filter from Aliexpress and having a peak inside.

As usual you're on your own when ordering on Aliexpress. Things can get tricky there. I've ordered the 20MHz version and the tracking number given was going to a total different place in the country. It took quite a while to get the refund. Tip, open a dispute, ask for a refund, ignore what the seller says or offers and continue asking for a refund. Eventually and with lot of patience the refund will probably be given.
  1. adventurelaus
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Комментарии
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The bandpass looks good on the SA. I would like to see the maximum RF that this device is rated for pass through it and into a dummy load while observing the ferrites with an IR camera for heating. Thank you. 73

WECB
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Filters of this kind should use iron powder core!

y_x
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Sorry but your presentation did not show how exacly looks frequency response of that filter. What is attenuation at 3, 7MHz and 14, 2MHz (f/2 and f x 2). I see that SA you using has very small dynamic response as scalar network analyzer. Maybe it is due to wide RBW. OK it looks that filter has more than -45dB at 3, 7MHz and close to -50dB on 14, 2MHz but there are a lot of noise, not a trace. Price depends on the seller but anyway filters are quite cheap. Question is how good capacitors are used - 1000V or more, we do not know. I would be very carefuly to use that filter at higher power - let say 100-200W. Reactive power that capacitors handle is far over 1kW (check 5B4AGN filters manual) so voltage and dissipated power raitings are important. There is no information from sellers about capacitors used, just how heavy filter is. Some of them publicate screens from vna that looks interesting. Anyway - thanks for video.

sqdqx