Why the difference in scatter position ?

[Rainer Ehlert]

Hi,

Now after a few days looking into the images which have been downloaded by Spectrum Lab of each meteor hit I have seen that they are falling in my case mostly between 1250 and 1300 Hz and now and then between 1300 and 1400 Hz as well as below 1250 Hz.

My tuned frequency is 174 308 400.

Can something be deducted out of this frequency differences ? Distance from and to transmitter and receiver or height above Earth ? or something else ?

We have now here in my town two receivers with the same frequency with antennas pointing parallel to ~10° and the lines are separated by 3.7 km. Can we use this for something intelligent :-)

Thanks for your comments in advance.

regards Rainer

[Dennis Condron]

Hola Rainer

It is not that unusual to observe meteor returns on several nearby frequencies on your receiver. There are times where unusual or enhanced propagation exists, due to the lower atmospheric changes or especially when sporadic E layering is present, will extend the range of a station's DTV pilot carrier at a far greater distance than normal, making them also visible on your receiver.

Although tropospheric signal enhancement is more prone to appear during the summer months of the year, it can occur at any time. Sporadic E is located much higher than a lower atmosphere extended range event, and can produce outstanding, often very high signal levels from much greater distances from your location.

Either one of these propagation conditions can produce the results you are seeing and are likely transmitters other than what you normally use for meteor returns as evidenced by the differing frequency that is received from them. 

I am including an example of a sporadic E propagation enhancement recorded earlier this year, where multiple (6) DTV pilot carriers are present - all on slightly differing frequencies.

Denny

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[Rainer Ehlert]

Hi Denny,

Thank you very much for the explanation.

This gives me now something on which I will work and see the frequency difference.

I am at 174 308 400 Hz and more or less pointing into the center of USA (  Oklahoma CIty, Oklahoma with 67.5 kW power and 1526 km (~ 948 miles) away from my site.

Interesting stuff

Thanks and regards Rainer