True 500 KHz did it for Marconi 111 years ago.
On 2/22/12 2:25 PM, Robert Kavanagh wrote:
>> 630 meter propagation will be almost entirely groundwave as ionospheric
>> conditions generally do not support skywave (a primary reason for the
>> use of LF and low MF for NDB).
> Not true.
>
> As G5VU has already noted, NDBs are routinely propagated via skywave,
> e.g. IPA in Easter Island has been frequently heard here (8700 km) after
> dark.
>
> Bob
> VE3OSZ
> _______________________________________________
> UR RST IS ... ... ..9 QSB QSB - hw? BK
>
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UR RST IS ... ... ..9 QSB QSB - hw? BK
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