[Elecraft] Thinking out loud again...

Mon Nov 25 20:30:00 2002

As Ron said, since when?  Also that would be news to NASA who has already
approved an HF rig for the ISS and the HF antennas are already installed.
 The rig I believe is a modified Yaesu FT100D permantly set to 5W.  They
want the low power so as to avoid RFI into sensitive station electronics.

For more info, check the ISS section on the AMSAT web site.

Mike WA3KYY

On Sat, 23 Nov 2002 10:28:30 -0800 "Ron D'Eau Claire"
<[email protected]> writes:
>    With someone on the moon? Or should the K2 be accompanied by a
> vhf/uhf transverter? Hf just won't get down through the ionosphere.
> 
>    73, Eddi ._._.
> -----------------------------------------
> 
> Since when? 
> 
> Spunik was on HF, among others. Sputnik, especially, put a 
> wonderfully
> loud signal onto the surface even with its tiny little transmitter.
> 
> If HF wouldn't pass through the ionosphere we wouldn't have to 
> concern
> ourselves about a "Maximum Useable Frequency" (MUF) above which the
> ionosphere  no longer refracts HF signals enough to be returned to 
> the
> earth. 
> 
> Going in the other direction - space to earth - the refraction has 
> quite
> a different effect and signals well below the MUF are quite audible 
> on
> the surface all the way down to those frequencies where atmospheric
> absorption  becomes a factor. That's typically below 7 MHz in the
> daytime and it's the reason we don't do much "skip" communications 
> on
> 80, 160 (or hear DX on the AM Broadcast Band) in daylight hours. 
> 
> Ron AC7AC
> K2 # 1289
> 
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