Topband: grey-zone

[Thomas Adam]

Hi,

I'm looking for a formula or algorithm to calculate the width of the 
dx-effective grey-zone/line. Any ideas or suggestions?

Thomas (adam@sbs.de)

P.S.  Greyline software from an early ON4UN book did this.  Width varies
with latitude.  Try John at  john.devoldere@village.uunet.be    (de W4ZV)



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