Hi Zim,

I'm interested in your statement that radar is not allowed under a ham
license. Perhaps you are right, but I don't understand why, in the U.S. at
least. FCC regulations for ham licenses in the U.S. do not specifically
state for what purpose you may transmit, they only state for what purpose
you may not transmit (for example, it does say that you cannot broadcast,
under most circumstances) As for emission types, there are many types, and
in addition, you are allowed to transmit the "test" emission type which can
be almost anything (except that it does say it cannot be a pulse type
transmission unless it is in a band where that is specifically allowed, and
there are several where it is allowed, but 10GHz is not one of them).

I read somewhere that the reason why there is the pulse restriction is
primarily to prevent interference with real radars.

So, as far as I can see, radar should be legal provided the emission type
is allowed and that it doesn't conflict with the broadcast restriction (and
since beacons are allowed, I don't think it would conflict).

I have no specific attachment to 10Ghz, its just that I found a source for
some nice high-power (100mW) gunnplexors at good prices and they are only
at 10Ghz. Getting that power level by other means above  2 or 3 GHz
frequency seems to me as if it will be difficult.

My idea behind the FM emission type is to send chirps followed by running
the gunn source at a CW frequency about 50 or 70 MHz lower, creating a 50
to 70MHz IF output of the received signal.

Sean


At 08:34 PM 9/7/01 +1000, you wrote:
>Additionally, a ham license is quite specific about what forms of
>transmission is authorised.
>Radar isn't one of them (depends on the country of course).
>
>I would think that genuine Radar experimentation would be routinely covered
>by applying for a special class license.
>After all, engineers often develop new radar systems, and they do have to
>test them !!!
>
>............... Zim
>
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