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High voltage overhead power lines influence on the LTE signal
Hi Sean

From your experience, do high voltage overhead power lines influence the quality of LTE signal to log antennas.

See attached pic. Antenna mounted on workshop, directed underneath.

Any info appreciated as always
If the power lines are in the line of sight, they can attenuate the signal particularly on the horizontal band. I have run into a similar issue a telephone wire in the line of path, where it attenuates the signal strength (RSRP) by around 10dB directly in the line of sight.

The wire voltage however is unlikely to have any effect. The mains voltage operates at 50Hz, so technically those wires are emitting an extremely low frequency 50Hz electromagnetic field. LTE however operates above 700MHz (mainly 800MHz for band 20 and 1800MHz for band 3), i.e. ultra high frequency frequencies. The only interference you may get is an audible hum on speakers as the 50Hz EMF can produce an audible 50Hz hum on the audio amplification circuitry.

High voltage arcs on the other hand where electricity jumps from one electrode to another can cause wide band interference. For example, a petrol lawn mower, hedgecutter, etc. operating even in a neighbours garden will likely cause a lot more interference from its spark plug than what you will get from those high voltage power lines directly in the path. If you have a gas stove and a TV in the kitchen, you may be able to see an example by putting on a Saorview channel such as RTÉ One and hold the stove's ignitor for a few seconds. The picture will likely brick up as the ignitor is sparking.

To check if those wires are obstructing the signal (assuming the antennas are mounted one above the other on the same pole), try attaching one at a time to the router's port #1 to see how the RSRP compares between the two. If there is a large difference (e.g. 5dB or more), then the wires are likely blocking a portion of the signal to at least one antenna. In this case, you can try raising or lowing the individual antenna heights to get the highest RSRP figure.

Another but less likely possibility is that the wires could be reflecting signals from another mast in a different direction. As above, you can try moving the antennas up and down and turning them left/right a few degrees to try achieving the highest SINR reading. If the SINR reading is already stable above 10dB, then it's unlikely picking up interference from another mast.
thanks for that Sean

I will move the dish in the next few days.  I noticed Band 3 is really good on the MikroTik Dish.  Performs better than the log antenna,  at least it seems that way.

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