2016-09-10

Thessaloniki NDB

Most radio hobbyists ignore that a Non-Directional Beacon (NDB) operates near former Alatini works in Thessaloniki. Its Morse code id is THS and it transmits continuously on 345 kHz.

Last week I visited the site of the beacon and shot a few photos.

TSL-NDBTSL-NDB
Panoramic view from the NorthNo tresspassing sign
TSL-NDB20160908-TSL-NDB
The eastern mastTransmitter shed
TSL-NDBTSL-NDB
Detail of insulators and pulleysView from the East

This nice NDB has been in operation for decades. Although it is located on the approach to RWY 16 of Makedonia Airport (LGTS), nowdays is not used much by aviators. 

It is easily accessible from public spaces and roads, just south of Thessaloniki Music Hall, at 40.593600 N - 22.948100 E, so if you are in the area you may visit the site. 




2016-09-04

CNSP30 balloon over Greece


CNSP30 balloon
Plot of CNSP30 balloon from HABhub
Today we had a daytime pass of CNSP30 balloon over Greece. Most previous passes took place during nightime so we missed the change to plot it. In the morning it appeared that the balloon would follow a southest course and pass over Attica, unfortunately it turned East and was better received in Larissa and Thessaloniki. The balloon transmits APRS packets using callsign K6RPT-11, which are gated to the APRS.IS network and then plotted at the HABhub tracker site. 

During the pass I run an APRS receive only setup and I enabled my connection to the APRS internet servers network with a filter to pass only K6RPT packets. Some of the packets uploaded were from my station, either received directly or over an APRS digipeater.


2016-08-21

Puff the fractal dragon

An ancient hackers' song, discovered on an old floppy disk:


No plain fanfold paper could hold that fractal Puff --
He grew so fast no plotting pack could shrink him far enough.
Compiles and simulations grew so quickly tame
And swapped out all their data space when Puff pushed his stack frame.

CHORUS:
        Puff the fractal dragon was written in C,
        And frolicked while processes switched in mainframe memory.
        Puff the fractal dragon was written in C,
        And frolicked while processes switched in mainframe memory.

Puff, he grew so quickly, while others moved like snails
And mini-Puffs would perch themselves on his gigantic tail.
All the student hackers loved that fractal Puff
But DCS did not like Puff, and finally said, "Enough!"

CHORUS:
        Puff the fractal dragon was written in C,
        And frolicked while processes switched in mainframe memory.
        Puff the fractal dragon was written in C,
        And frolicked while processes switched in mainframe memory.

Puff used more resources than DCS could spare.
The operator killed Puff's job -- he didn't seem to care.
A gloom fell on the hackers; it seemed to be the end,
But Puff trapped the exception, and grew from naught again!

CHORUS:
        Puff the fractal dragon was written in C,
        And frolicked while processes switched in mainframe memory.
        Puff the fractal dragon was written in C,
        And frolicked while processes switched in mainframe memory.


   

2016-08-20

NASA releases research papers to the public



NASA published the following announcement, effectivley giving free public access to NASA research papers: 

NASA PubSpace

NASA is using PMC to permanently preserve and provide easy public access to the peer-reviewed papers resulting from NASA-funded research. Beginning with research funded in 2016, all NASA-funded authors and co-authors (both civil servant and non-civil servant) will be required to deposit copies of their peer-reviewed scientific publications and associated data into NASA’s publication repository called NASA PubSpace. This exlcudes patents, publications that contain material governed by personal privacy, export control, proprietary restrictions, or national security law or regulations. NASA PubSpace is part of PubMed Central (PMC) which is managed by the NIH.

You can now search NASA related articles archived in PMC at NASA PubSpace. PubSpace will be fully functional Fall of 2016.

Already over 800 recent research articles, published within 2016, have been uploaded in PDF format to the site, which uses the infrastructure of the US National Library of Medicine, National Institutes of Health.