To where should I point my Antenna Channel 7 174.31 MHz

[Rainer Ehlert]

Hi,

Now that I finished my Antenna for 174.31 MHz and found the bug why I had no scatters yesterday I made a search of Channel 7 TV tations in USA and found several ones and from this I picked 7 with good transmission power.

Looking at the attached image from Denver, Colorado to Little Rock, Arkansas I have a 40° angle.

Should I point in the center of this triangle ?

I assume I get from each and every tower the hidden for me ATSC Pilot tone 174 310 KHz as well as all scatter produced by this transmitters due to the angle of my 4 element Yagi.

Or ?

regards Rainer

PD I am getting scatters again :-)

[Dennis Condron]

Since no one else has responded so far Rainer, I believe you are exactly correct in placing the alignment of the antenna heading at the center of the seven DTV 7 stations as indicated on the map. More than likely the stations in Texas will be what you are seeing meteor return signatures from, as they are the ones closest to your receiving location. A 4 element Yagi is not highly directive and should easily present an acceptable forward gain pattern over the coverage area of all 7 of the DTV 7 stations.

Later possibly, you may be able to verify which DTV 7 emitter it is you are receiving meteor returns from by the confirmation of aircraft that are flying a route over or near the transmitter site. I have been using https://planefinder.net/ to do that long ago to verify the DTV 2 stations I have been using as meteor detection signal sources.

In any case it is good to see you have been successful on getting the antenna constructed and in particular have it mounted out in the open now should improve the receiving results.

Denny 

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[Rainer Ehlert]

Hi Denny,

Thanks for your comments.

Yes, that is what I did yesterday in roder to see what happens. Looks good for me.

I did let run ARGO and Spectrum Lab side by side and below two videos. One from the ARGO images and onme from the Spectrum Lab images.

Interesting is that some meteor scatters which are seen in Spectrum Lab do not appear in ARGO as the right bar from Argo just covers about +- 20 Hz from the chosen center frequency and in Spectrum Lab one can adjust this scale. Am I missing somehting with ARGO or is this ¿ loss ? not important ? OK, if they really are meteor scatters.

OK, I need to observe for more time the Spectrum Lab scale as it is the first time that I was able to get the Meteor detection in Spectrum Lab. Every day one learns a new thing with this :-)

ARGO images

https://rainerehlert.com/000_RTLSDR/000_MeteorScatter/20200926-27/20200926-27_ARGO_RMO-NHSA.mp4

Spectrum Lab images

https://rainerehlert.com/000_RTLSDR/000_MeteorScatter/20200926-27/20200926-27_Spec-Lab_RMO-NHSA.mp4

At the moment it is running and looking for Sextantids.

regards Rainer

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