Apostolos

[E @postcardsbyelif]

postcards from paris

[Apostolos @0xCoto]

@MuzafferKal_ That's the wrapped phase angle of the return loss. In terms of the complex S-Parameters, for a one-port network this can be derived using trigonometry: arctan(Im{S11}/Re{S11})

Not particularly important for such measurements though; |Sij| is usually a more meaningful quantity.

[Apostolos @0xCoto]

Good day at the lab today. 😁

[Apostolos @0xCoto]

@F4DAV @F4DAV @tvoje___mama @LEO_GSaaS A few debugging hours later.. looks like the CAD model was problematic. The ridge was abnormally thin; due to geometry discretization (meshing) issues, it was misbehaving like a diffracting grid. Solver is openEMS, but I'm building a massive "API".

[Apostolos @0xCoto]

📡 EC-FDTD solver working well!

⚡️ E-Field distribution for an X-band horn antenna:

[Apostolos @0xCoto]

@hmbark And here's the pattern as a bonus

[Apostolos @0xCoto]

⚡ 🧲 E-field distribution of my dipole-fed corner reflector antenna at 2.4 GHz. Always neat to observe wave diffraction!

[Apostolos @0xCoto]

@hmbark

[Apostolos @0xCoto]

@wavedrom @pepijndevos Reaching 64 GHz takes a bit more cost and way more massive VNA size. :)

[Apostolos @0xCoto]

@hmbark Correct, it was detected by STARE2 and CHIME.

[Apostolos @0xCoto]

📡 New preprint! Already at 𝟭𝟬 citations before publication :)

🔭 FRBSTATS: A web-based platform for visualization of fast radio burst properties

https://t.co/98kGn4a4po

[Apostolos @0xCoto]

@OJ_Astro Is there a particular .tex template you'd recommend using? Apparently the AASTeX template (https://t.co/x9wwu8vMQk) is not compatible with your .cls (though I might be doing something wrong)?

[Apostolos @0xCoto]

@OJ_Astro @telescoper @Clarivate @danielskatz @kyleniemeyer @arfon Are there similar plans/efforts to assign an impact factor to @JOSS_TheOJ or is this something that's not on the roadmap?

[Apostolos @0xCoto]

@telescoper 2 years later, is @OJ_Astro expected to have an 'official' impact factor anytime soon? Yes, JIF is a very poor metric, but is still commonly looked at by funding programmes etc. to evaluate work. Is the journal trying to set an example by discouraging the use of JIF as a metric?

[Apostolos @0xCoto]

@derekkozel @eumweek Not sure yet, but it's been on my radar.

[Apostolos @0xCoto]

Excited to announce a new Journal publication in the Monthly Notices of the Royal Astronomical Society! 📡 🌟

'Adaboost-DSNN: An Adaptive Boosting Algorithm Based on Deep Self Normalized Neural Network for Pulsar Identification': https://t.co/6vRJWdyaVe

[Apostolos @0xCoto]

@luigifcruz @adamlikesai Thank you Luigi, uhubctl (https://t.co/i062ApNumu) did the trick. Apparently I also had to `ifconfig wlan0 down` before powering the USB off to fully prevent the adapter from transmitting, but seems to work well. 😁

[Apostolos @0xCoto]

@luigifcruz @adamlikesai Any ideas if the Jetson Nano supports (temporarily) powering off a USB port? My Wi-Fi adapter is noisy and I have to physically disconnect it every time I make a radio observation. `nmcli radio wifi off` doesn't seem to suppress RFI, only the Wi-Fi :)

[Apostolos @0xCoto]

@co7wt @hamradio2dot0 @rtlsdrblog @K0LWC @AMSAT @AmsatUK Very nice, I'll definitely try this out soon to replace my manual solution for RFI localization!