Not always getting alerts

[Tramline]

Can anyone offer any clues as to why B742's do not alert despite being correctly added in the A/c type box.

Very frustrating and just noticed B743's also do not alert - PZ-TCM for example often overflies but rarely alerts as a B743?

[tarbat]

Tramline, I just added B742 to my alerts, and straight away got 2 alerts.



What exactly are you entering on the Alerts page?  Can you post a screenshot maybe.

[DaveReid]

Is it perhaps relevant that N703CK has ADS-B and PZ-TCM doesn't ?

[Fenris]

a pity i cannot click on the alert popup and go to the plane on the screen directly to see where it is.

Yes, I thought that would be a great feature too.

Is it on the wish list?

[Fenris]

Is it perhaps relevant that N703CK has ADS-B and PZ-TCM doesn't ?

How does an aircraft type alert work exactly? Is the AT broadcast in the Mode S frames or does it rely on a lookup in the database? If it is that multi-stage process it might not work if the intermediate results don't get found properly.

[DaveReid]

Is the AT broadcast in the Mode S frames

No

or does it rely on a lookup in the database?

Yes

[radarspotter10]

can someone give me  the most used  squawk code, i'll try that one
ciao
frank

good site for codes.
http://www.nats-uk.ead-it.com/aip/current/enr/EG_ENR_1_6_en.pdf
from pat

[DaveReid]

7700 codes are relatively rare, so they are not the best test of the alert system.

They are indeed - I've had only two 7700s in the last 7 days (out of a total of around 29,000 flights/squawks recorded).

Top 10 squawks recorded over the last week:

CODE #
7000 558
0430  40
7710  40
7701  39
7706  39
0043  38
2252  38
7703  38
2226  37
2273  37

No contest, really, if you're looking for a the best squawk to use for testing purposes.

[tarbat]

Or even use 1* 2* 3* 4* 5* 6* 7*  (press enter between each code).

Will guarantee you get loads of squawk alerts!!

[sterigia]

ok i will use wildcards for testing purposes
thanks for the idea
ciao
frank