Re: Compound Spot Filter

Dave AA6YQ

+ AA6YQ comments below

I must be thick.

What I was looking for and finally settled on is this:

Band='6M' AND Mode='MSK144' AND ((NAE='Y') or (NAM='Y') or (NAW='Y'))

I wanted to see only spots from 6 meters and mode MSK144, and I only wanted to see them if they were heard (and subsequently spotted) in North America.

I have no interest in someone in the UK telling me they are seeing active stations in Germany on 6 meters.

If a station is not being heard anywhere in the USA, I'm not going to hear them, so why do I want them cluttering up my screen?

Am I somehow misinterpreting what the above filter does?

+ No, but don't be surprised if some of the stations in that appear in your Spot Database Display are being spotted by stations in Europe and Asia.

After a little more playing, I came up with the following Filter that eliminates mode, but collapses two bands which tend to show similar Es openings.

((Band='10M') or (Band='6M')) AND ((NAE='Y') or (NAM='Y') or (NAW='Y'))

Again, I'm interpreting this to say,

On either band, if someone from North America has heard any station, any mode, show it to me. If you are not from North America, leave me alone.

This appears to answer the question: Is 6 meters open from anywhere in the world to North America? .

Is the filter, as I have defined it doing what I asked it to do, or do I have a syntax error of some sort?

+ That expression will function as you expect.


With respect to your other point:

+ For Es propagation on 6 meters, specifying a maximum distance between your QTH and the closest spotting station works best. I've never experienced an F2 opening on 6 meter.

This doesn't reflect what band conditions are actually like on 6 meters nearly every summer, at least in Missouri, Iowa, Texas, Colorado, etc:

Multi-Hop Es to Japan via FT8 is very common on 6 meters in the summer. Two years in a row, I have worked more than 30 JA stations on 6 meter multi-hop Es in a single day. (2018 and 2019)

I also worked EU and Africa both years on FT8, 6 meters.,..and it was clearly multi-hop sporadic E. The keys are mode, power and antennas. (in other words, EIRP)

All were on FT8, all involved a minimum of 500w out and all were using antennas with no less than 10 dBd gain.

Many USA operators experienced the same openings and while they were highly focused, they included Missouri to Japan and Texas to Japan as well.

And...all were spotted on PSKRreporter by stations from Ohio to Arizona. There was no F2 at the time, but there were E clouds all over the place.

+ I am familiar with multihop Es; my recommendation to use "maximum distance between your QTH and the closest spotting station" stands. The fact that you are working Japan via Es from Iowa is unlikely to be relevant to me, but if an op within 500 miles of my station is working Japan via Es, I want to know about it. Using "distance to spotting station" is a much more precise filtering mechanism than coarse-grained areas like NA-E or US states .

It looks to me like SC can do the same thing with the filter example I used above:

((Band='10M') or (Band='6M')) AND ((NAE='Y') or (NAM='Y') or (NAW='Y'))

If those JAs show up this summer, this filter will spot them, unless I'm completely confused. When I ran this filter this morning it showed:

All the 6m MSK144 spots from my local WSJT-X

All the 6m MSK144 spots from N6WS
All the 6m FT8 Spots from N6WS
and a single 10m FT8 from N6WS

All those spots originated from North America.

+ For 6m, I would use this SQL filter:

(Band='6m') and (ODX<500)

+ It's not necessary to use this SQL expression, as SpotCollector's Band filter window lets you specify an ODX constraint for each band.

+ For 10m, I don't filter by "location of spotting station", though doing so is probably reasonable during the sunspot minimum.

+ Try doing the following:

1. on SpotCollector's Main window, click the Prop button just beneath the "Spot source status" panel at the top

2. In the Propagation window that appears,

2a. select "Bands vs Time" in the upper-left corner

2b. in the "DX active during past 24 hours" panel in the upper-right corner, set the "Max distance" to 500, and click the "Filter & Analyze" button.

2c. Note that double-clicking any of the vertical bars will filter the Spot Database Display to show the active stations

+ When I do this, I see activity on 6m at 11Z, 12Z, and 13Z, with 8 active stations at 13Z - almost all in MSK144.

+ A full description of this window's capabilities is here:



Dave, AA6YQ

Join to automatically receive all group messages.