2017-10-27, 08:24
This thread mixes several problems, I will try to seperate them:
My comments are:
For 1.): assuming the station doesn't have internal noise (suitable power supply, shielded/ unshielded cables, well placed antennas) only external noise counts. If you cannot identify and eliminate noise sources, there are only two options: if the frequency of the noise sources is higher than say 15 kHz use the LP filters and set the cutoff frequency accordingly; if not, lower the amplification and/ or raise the threshold.
For 2.) Egons suggestions are good, but what about a quality measure for the signal used in calculations? For stations within the network (but ONLY for them), this appears to be a good indicator:
https://www.meteomelin.be/staticfiles/bl...egion=1&id=
In the case of the few stations contributing to more than one region the regions should be combined in the efficieny measure, but if the regions are going to disappear anyway, this may not be required.
For 3.) Stations within the network (surrounded on all sides by other stations within a reasonable distance) need to be treated differently from stations at the fringe of the network like coastal stations or even completely isolated stations (on islands, isolated towns...) Maybe one could calculate a measure that indicates the integration or isolation of a station?
From the experiency of the other network that operates globaly (http://wwlln.net/) I would suggest to install the LN filters directly on the board since soldering the tiny ICs afterwards is really difficult. Wwlln uses a cutoff of 22 kHz since most of the sferic signal strength is below this frequency. If bought in quantity the cost of the LP filters is acceptable and the added flexibility in handling noise and improving S/N ratio is well worth it.
- how to I optimize the S/N ration of a station?
- how do I measure the efficiency of a station?
- How do we handle stations "inside" the network and isolated stations?
My comments are:
For 1.): assuming the station doesn't have internal noise (suitable power supply, shielded/ unshielded cables, well placed antennas) only external noise counts. If you cannot identify and eliminate noise sources, there are only two options: if the frequency of the noise sources is higher than say 15 kHz use the LP filters and set the cutoff frequency accordingly; if not, lower the amplification and/ or raise the threshold.
For 2.) Egons suggestions are good, but what about a quality measure for the signal used in calculations? For stations within the network (but ONLY for them), this appears to be a good indicator:
https://www.meteomelin.be/staticfiles/bl...egion=1&id=
In the case of the few stations contributing to more than one region the regions should be combined in the efficieny measure, but if the regions are going to disappear anyway, this may not be required.
For 3.) Stations within the network (surrounded on all sides by other stations within a reasonable distance) need to be treated differently from stations at the fringe of the network like coastal stations or even completely isolated stations (on islands, isolated towns...) Maybe one could calculate a measure that indicates the integration or isolation of a station?
From the experiency of the other network that operates globaly (http://wwlln.net/) I would suggest to install the LN filters directly on the board since soldering the tiny ICs afterwards is really difficult. Wwlln uses a cutoff of 22 kHz since most of the sferic signal strength is below this frequency. If bought in quantity the cost of the LP filters is acceptable and the added flexibility in handling noise and improving S/N ratio is well worth it.
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