On 21/01/2010 at 13:25 Roger Lapthorn wrote:

>BTW, Dom Baines M1KTA quoted something interesting to me today: "Terman's
>Radio Engineering Handbook (1948)
>stated the maximum working distance for 1 kW 500kHz over salt water was
>1,500 miles!". So, I need to up my power then!

Nearly 50 years ago, a former RO told me of the day he called an Alaskan coast 
station on 500 to say he was entering harbour.  He was answered by Wellington 
Harbour Radio.

John Rabson 
F5VLF
58800 Cervon
France
JN17vg