Correct filter setup for HL2 and SparkSDR

[Franco Spinelli]

Which is correct filter type to setup in SparkSDR for latest filter from Makerfabs:

n2adr-lpf, n2adr-hpf-lpf or n2adr-no-rx-filter?

Regards

Franco Spinelli

IW2DHW

[Alan Hopper]

Hi Franco,

they are all fine, the difference is how much filtering is used on receive, if you have strong am broadcast stations nearby the n2adr-hpf-lpf might be best as it turns on the hpf when appropriate.  At my location it does not make any difference.

73 Alan M0NNB

[Franco Spinelli]

Il 23/03/23 15:22, 'Alan Hopper' via Hermes-Lite ha scritto:

> Hi Franco,
> they are all fine, the difference is how much filtering is used on
> receive, if you have strong am broadcast stations nearby the
> n2adr-hpf-lpf might be best as it turns on the hpf when appropriate.  At
> my location it does not make any difference.

Thanks.

No AM station in Italy but can be from other states at night.
And which is the best for tuning outside OM bands (i.e. Navtex)?
n2adr-no-rx-filter?

Franco Spinelli
IW2DHW

[Karl Heinz Kremer]

This would only be a problem with a nearby transmitter. I live 2 miles from a 50kW AM transmitter and I do need the filter, otherwise I receive AM talk radio regardless of what frequency I tune to. If you don't have this situation, you will very likely not need the filter. 

Karl Heinz - K5KHK

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[Alan Hopper]

Hi Franco,

these filter settings are smart and won't engage a filter that will affect any receiver on your chosen frequency so  more filters are better if you have local very strong signals, some tests indicated fewer filters may have advantages due to dithering effects under some situations.  So In your case you may not see any difference.

73 Alan M0NNB