Beeping morse-like signal found on 599p99 MHz

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Beeping morse-like signal found on 299p995MHz
55.PNG
Frequencies 299.995 MHz
Frequency Range 299.995 MHz - 299.995 MHz
Mode LSB
Modulation
ACF
Bandwidth 350 Hz
Location Portugal, Lisbon
Short Description Beeping morse-like signal at 299,995MHz found in Lisbon, Portugal. Using stock antenna from RTL820T2 RTL dongle and SDR#.
I/Q Raw Recording Download file
Audio Sample

Beeping morse-like signal at 299,995MHz found in Lisbon, Portugal. Using stock antenna from RTL820T2 RTL dongle and SDR#. The frequency of the signal oscillates slowly as if moving. Permanent signal 24/7. Tried Cwget, TrueTTY, SeaTTY in various modes but I could get no meaningful result. I'd say military, any thoughts?

P.S.: title says 599MHz, that was before I found it to be a 2nd harmonic.