Is an external filter with a FA blue dongle needed?
Short answer is: In some circumstances, yes.
Example:
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At @foxhunter’s location, Filter did not bring any improvement as his location has low RF noise environment.
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At my location if I remove the filter, the reception drops to 10%, as my location has very high RF noise environment.
Please see following scans (with & without interna/external Filters) which I conducted about 6 months ago at my very RF noisy environment. I carried out scan as per following guide.
Spektrum - How-to Speedily Scan RF Noise in band 24MHz ~ 1800MHz
The results of scans are below:
The scan 1 shows RF noise picked by antenna and processed without any filter , The scans 2 & 3 were done with filters, and show how filters remove this noise.
Scan 1 of 3 - FA Antenna + Generic DVB-T (no internal or external filter)
CLICK ON IMAGE TO SEE LARGER SIZE
Scan 2 of 3 - FA Antenna + ProStick Plus (Only Internal filter of ProStick Plus. No External filter)
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Scan 3 of 3 - FA Antenna + ProStick Plus (with internal filter) + External Filter (FA Light Blue)
CLICK ON IMAGE TO SEE LARGER SIZE
