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Re: (meteorobs) Radio Observation of Meteors
At 12:04 AM 8/21/99 , you wrote:
> I hadn't had any luck with meteor scatter on HF, possibly because of
>signals and noise from other modes of propagation, and the lack of a
>high gain directive antenna. On 28 MHz I used a vertical (Butternut
>HF6V), on 50 MHz I had a close spaced 5 element beam, but on 144 MHz I
>used a wide spaced 10 element beam tuned to the bottom of the band - and
>it worked great.
So, you add gain as you go up in frequency.
Freq Ant Gain Echo Strength Sky Noise
28 0 dB 1.0 1
50 10 dB 0.5 1/10
144 15 dB 0.2 1/250
It sound like you're getting the best SNR at 144 with your set-up!
The reason I wanted to try WWV at 20 MHz is you get a 10 kW signal coming
your way . . .
> On the subject of radio observations, I was wondering if amateurs had
>tried radar detection of meteors themselves. Perhaps using a beacon
>with a directional antenna pointing upward, and a receiver with an
>upward facing antenna a few kilometres distant but out of the ground
>wave of the transmitter?
Unfortunately, beacons are limited to 100 W. I'm not certain if that's peak
or average power, though! if it's average, I'd love to run 10 kW peak at a
1% duty cycle . . .
Regards,
John
KO6X
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