Re: Digest for radiometeors@googlegroups.com - 1 update in 1 topic

[Gary Eldridge]

Rainer,

Do you have a rotatable directional antenna? It may be helpful to find the direction from which the signal is coming. But the first step is to determine whether this signal is coming from inside your own home or somewhere else. The reason I mention this is because many times an interfering signal or noise is generated by something within our own houses and can be easily eliminated once we find it. If it is external to your house then there are other approaches to take.

Gary

KC8UD

 

On Thu, Dec 10, 2020 at 7:14 PM <radiom...@googlegroups.com> wrote:

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• Strong signal interfering ... - 1 Update

Strong signal interfering ...

"rsf...@rsfotografia.com" <rsf...@rsfotografia.com>: Dec 10 12:10PM -0800 Hi,   Since a few days I have intermittently a very strong signal interfering my echo reception. The intersting thing is that it wanders back and forth as an echo in the frequency up to 1350 Hz and then it disappears but since yesterday it is there and it moved from 750 Hz to now 1350 Hz.   Can I how somehow deduct the distance of the transmitter or has this something to do with the Atmosphere ?   Most of my meteor echoes are in the range of 1500 to 1600 Hz and somtimes even hight up to 2000 Hz.   Thanks for your comments in advance   regards Rainer

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[rsf...@rsfotografia.com]

Hi Gary,

I can rotate the antenna manually and that is what I did and it disappeared for a moment but came back. I do not know what could transmit at 174 MHz in my house or nearby.

We have a second RMO station here in my town on a friends roof exactly the same as mine 4 km in distance from mine and he does not detect it. He has a clean signal. OK, my station is 70 meter higher over sea level as his. In order tog et his going I needed to make a Bandpass filter which is working great. Immediately after installing the Bandpass filter he caught echoes. You can look at our results in www.rmob.org under the names of Ehlert and Zapata and you cans ee our stations in the center of Mexico. Our results are nearly always around the number 35 to 45 ... His has a very nice logical meteor echo pattern while mine is since yesterday like a vegetable garden.

Absolutely strange, but my main question is why does that echo wander from ~700 Hz to ~1400 Hz. Does this not mean that a transmitter with 174 MHz is reflected at different distances ?

I do not know if I am right, but if the object moves to the transmitter the frequency gets higher and when it moves away from the transmitter the frequency is lower ? Doppler effect ? or does this not apply here ¿?

I would understand it if the frequency would be stable always at a certain value.

I have seen that we have some big Balloons navigating at a height between 55.000 to 65.000 feet from the " Project Loon " ... Could this be the culprit as they move very slowly ... ?

Also it could be a new station setup in Mexico in my line of detection but in order to find that out in Mexico is impossible ...

I am working with a 4 element DIY Yagi designed for the frequency of 174.31 MHz and scanning the ATSC pilot tune at +310 kHz. My antenna covers at 3dB and angle of around 58°. Both stations are tuned at 174 308 000 Hz USB with 2000 Hz bandwidth.

At the moment while writing this the signal is weak

I will keep observing this.

Thanks and regards Rainer