Unknown 36MHz low VHF band radar with pulse pattern
 | |
|---|---|
| Frequencies | 36 MHz,36.1 MHz,36.7 MHz |
| Frequency Range | 36 MHz - 36.7 MHz |
| Mode | AM |
| Modulation | Pulsed |
| ACF | — |
| Bandwidth | 97 kHz |
| Location | Europe |
| Short Description | Low VHF band radar with pulse pattern, transmits groups of three pulses. |
| I/Q Raw Recording | Download file |
| Audio Sample | |
This is an unidentified low VHFVery High Frequency (30-300 MHz) band radar, recorded in Northern Europe during good propagation conditions, 25th of February, 2024. It was also seen on 11th of November, 2023.
The radar transmits pulses in groups of three. Interval between pulses in a group is approximately 2.6 msmilliseconds (.001 of a second) and interval between groups is approximately 10.5 msmilliseconds (.001 of a second). So group repetition frequency is about 95 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). and pulse repetition frequency within groups is 385 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).. Bandwidth is about 97 kHzKiloHertz (kHz) 10^3 Hz but signal edges are hard to determine due to fading and splattering.
Samples[edit]
A variant with slightly higher pulse frequency was seen on Oct 2, 2024. It exhibited fast variations in strength, possibly due to beam steering, technical issues or even rapidly changing propagation.| Variant, sample 1 | Variant, sample 2, recorded later |
|---|---|
 |
 |
Frequencies[edit]
The radar has been observed on the following approximate frequencies. Exact center frequency is hard to determine due to fading and splattering effects.
36 MHzMegaHertz (MHz) 10^6 Hz
36.7 MHzMegaHertz (MHz) 10^6 Hz
36.1 MHzMegaHertz (MHz) 10^6 Hz (variant)
