RE: [amsat-bb] Re: new 5.8ghz cordless phones

["Edward R. Cole" <al7eb@xxxxxxxxxxxxx>]

Uhuh!

And lets not forget that 5760 MHz is the amateur cw/eme frequency!  I guess
another mw ham-band bites the dust!  Strange how our ham microwave
allocations have been chosen for occupancy by all these "unlicensed"
commercial users!  Soon the only freq. left for ham use will be "above"
200-meters...see what our reward is for extending the frontiers of radio!?

Ed - AL7EB
CQ-60Hz = "Hum-de-Hum-de,  Hum-Hum-de-Hum"

At 11:59 AM 12/9/02 -0500, Tom Clark, W3IWI wrote:
>The comment was made ....
>
>>Looks like if everyone went to 5.8GHz our AO-40 reception would be free ...
>
>True, in the short term, but perhaps bad news for the future.
>
>Regarding C-Band, I note that in the ITU frequency allocation tables,
> - the band 5650-5670 MHz is marked "Amateur Satellite Service, Secondary,
>Worldwide, Earth-to-Space" and
> - the band 5830-5850 MHz is marked "Amateur Satellite Service, Secondary,
>Worldwide, Space-to-Earth".
>
>This 2x20 MHz pairing could be one of our most valuable resources in future
>satellites. I can envision an in-band transponder with a single 5750 MHz
>Local Oscillator. This would swap the sidebands and be an inverting
>transponder, which would cancel out the bulk of Doppler shift. Both
>satellite and ground user could employ a single dish antenna for both uplink
>and downlink (using opposite polarizations). A standard "BUD" (big ugly
>dish) TVRO antenna would provide enough gain so that very little TX power
>would be needed, even to achieve up/downlink bandwidths of several MHz.
>
>But if the 5.8 GHz telephone and 802.11a QRM gets too bad, ideas like this
>could become unfeasible.
>
>73 de Tom, W3IWI
>
>
>
>
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