OGN-03-VLNA R4 - Very Low Noise Amplifier designed for OGN Base Stations

OGN-03-VLNA R4 - Very Low Noise Amplifier designed for OGN Base Stations

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EPPT |

EPPT OGN Receiver located in central Poland at the Aeroklub Ziemi Piotrkowskiej

Latitude: +51.3846020
Longitude: +19.6834450
Elevation: 208m AMSL
Nearest BTS stations: 300m, 500m, 750m

Current receiver setup:

Antenna: Kathrein 736350, 8dBi, located at 8 meters AGL
LNA: TMA OGN-03-VLNA
DVBT Dongle: Simple "blue" dongle with RT820T2, no build-in LNA, plastic case, not shielded
SBC: Raspberry Pi 2

Performance (up to 2019.09.06):

Maximum reception distance so far: 298 km
Maximum reception distance for lowest altitude: 129.7km at just 22m AGL via atmospheric duct.

Open Glider Network Range data (2019.09.11). Click image to enlarge.

One minute spectrogram recorded on 2019.04.15 with DVBT dongle only, no external LNA connected. Noise level fluctuactions visible, generated most probably by the IMD from local BTS stations. Click image to enlarge.

One minute spectrogram recorded in the evening on 2019.09.03 with OGN-03-VLNA connected, when we have the highest LTE800 activity from our local BTS stations. Very clean spectrum, no traces of LTE IMD, high activity visible. About +8...+10dB SNR improvement due to the overall system noise figure reduction and LNA high power gain. A lot of weak signals on the left side are now clearly visible. Click image to enlarge.

OTH (over-the-horizon) receiving record for EPPT via atmospheric duct on 12 May 2019. Click image to enlarge.

High overall sensitivity. Often > 30dB@10km (Source: Grafana [EPPT])

(C) 2019, Kołek Szymon. Contact: simon(at)glidersim.com