Fwd: AIR - RADIORAMA
claudio
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AIR - RADIORAMA |
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Posted: 09 Feb 2021 10:35 AM PST Recently I had the idea to improve the possibility to quick measure the frequency difference of two reference oscillators , in this case two Rubidium Oscillators : a Rhode Schwarz and an M100 that I put into a yellow rack with a power supply , as in the pictures .  A) Multiplying by 100 the frequency of both oscillators ( with the use of simple home made Comb Generators ) B) Comparing the frequency of the two oscillators with the method of the " beats " at 1 GHz , using a selective receiver . In the test I have used a Spectrum Analyzer , but every simple receiver , even an RTL Dongle can be used with the same results . The two Comb Generator needed was made with two EX-OR fast ports ( ACT86) , with one of the two inputs connected directly and the second through a variable resistor that , with the input capacitor of the port ,add a small delay .  Trimming the resistor the component at 1 GHz was at a comfortably level of -50 dBm . The output of the two Comb generator was summed simply with two capacitor and two resistors . You can find here the images of the output of a single Comb Generator , wide band and relatively narrow band .   What can we espect from this setup while
summing the signal of the two Comb Generator at 1
GHz coming from the two Rubidium ?
The composition of the two signals will
change from a maximum of +3 dB when the phase of the
two oscillator is the same and to a minimum ( if the
signals are exactly equal of ) zero .
In this case the spream is around 20 dB , but
doesn't mattere because we have only to count the
cycles .
The maximums will be always very wide , while
the nulls will be always very sharp .
To check this I have tuned the Rubidium M100
as far as was possible , and you can see in the
first part of the following screen with zero span (
this means that the Spectrum Analyzer acts as a
receiver tuned at 1 GHz with vertical logaritmic
scale ) .
Please note that the horizontal time sweep is
1000 s ( 100 second/div) .
At the beginning you can count around 10
oscillations in 100s , that means one cicle each 10
seconsd = 0,1 Hz of difference at 1 GHz .
Being 1 GHz = 10E9 Hz , this means a
frequency maximun difference of 10E-10 .
While time was running , I have changed the
frequency of the Rubidium M100 to approach that one
of the RS Rubidium .
At the end of the screen the difference is
around one cycle each ten second at 1 GHz , that
means 10E-11.
 Continuing the approach of the frequencies ,
I have increased the timebase till 6000 s because
the phase change was very slow .
 At the end , using sequential methof of
approcimation , in the last picture ,it is not easy
if impossible to see a real periodicity in the phase
rotation and so in the frequency difference .
We are in the range of 10E-12 . I am pretty
sure that this limit doesn't depend from the method
of measurement ( being a "physical method ") , but
from the limit of stability ( jitter ) of one ( if
not both ) Rubidium Oscillator , and this was the
scope of the experiment .
If I am right , this simple setup , that
everyone can easily reproduce at low cost , can
measure stability higher than that of Rubidium
Oscillators .
To check this with no dubts , I need two
oscillator with performance 10 times better than the
rubidium oscilllator I have used .
Hope one day I can check this , if I am so
crazy to invest in two Masers , because actually I
am only playing to infringe my limits .....
But I have another couple of Rubidium
Oscillators from Stanford that I can try to check
in the same way ....
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Seminar with small video from Minicircuits Posted: 09 Feb 2021 08:48 AM PST |
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claudio
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AIR - RADIORAMA |
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Posted: 11 Feb 2021 10:06 AM PST  COS'È IL WORLD RADIO DAY? Il World Radio Day è la Giornata Mondiale della Radio proclamata dall'UNESCO per il 13 Febbraio di ogni anno. Anche l'Italia celebra la Giornata Mondiale della Radio con i più grandi protagonisti delle Radio Nazionali, Locali, Web e Universitarie.
via Bruno Pecolatto-AIR 130  |
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WORLD RADIO DAY - X° Giornata Mondiale della Radio - MUMEC Posted: 11 Feb 2021 09:51 AM PST
 A tutti gli amici del MUMEC Museo dei Mezzi di Comunicazione di Arezzo Inviamo con la presente, l’invito per la partecipazione al convegno di celebrazione del
L'evento, indetto da UNESCO, sarà celebrato dal Museo con convegno online assieme ai partner principali: Centri per l’UNESCO di Arezzo e Firenze, RAI TOSCANA ed AIRE Associazione Italiana per la Radio d’Epoca. Maggiori info in locandina allegata alla presente
Per partecipare collegarsi al link zoom alle venerdì 12 febbraio alle 15:45:
Entra nella riunione in Zoom ID
riunione: 973 0523 7877
via Bruno Pecolatto-AIR130  |
claudio
SALVE
per chi fosse interessato
ik8lvl Claudio
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AIR - RADIORAMA |
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Francobollo 90anni della Radio Vaticana Posted: 16 Feb 2021 10:11 AM PST
 Dalle Poste vaticane
un francobollo per il 90°
della Radio del Papa
Un doppio anniversario fissato in un foglietto filatelico: si festeggiano i 90 anni dalla fondazione della Radio vaticana e i 160 dalla nascita de L'Osservatore Romano. L'omaggio, nel blocco in uscita il 22 febbraio 2021 insieme ad una ricca emissione filatelica. Tratto da https://www.vaticannews.va/it/vaticano/news/2021-02/dicastero-radio-vaticana-osservatore-anniversario-poste.html via Bruno Pecolatto-AIR130
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AIRE NAZIONALE E AIRE TOSCANA – INTERVENTI DELLA 10MA GIORNATA MONDIALE DELLA RADIO 2021 – UNESCO Posted: 15 Feb 2021 11:51 PM PST |
claudio
Salve
Per chi fosse interessato
CLAUDIO IK8LVL
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Afghanistan on Mediumwave and Shortwave Posted: 25 Feb 2021 09:50 AM PST
 *British DX Club
Afghanistan on Mediumwave and Shortwave*
featuring:
Radio Afghanistan
Target Broadcasts to Afghanistan.
Afghanistan on Mediumwave.
Afghanistan DX Timeline
February 2021.
Check out and Download:
via Bruno Pecolatto-AIR130
 |
claudio
Salve,
Giro per fosse interessato.
IK8LVL Claudio
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claudio
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HamSCI - La ricerca scientifica collaborativa sulla ionosfera Posted: 14 Mar 2021 03:37 PM PDT
Il
contributo dei radio-appassionati al progresso
tecnico e scientifico visse il suo momento di
gloria nel primo novecento. Oggi molti
partecipano dando un contributo rilevante ad
alcuni progetti di ricerca scientifica. Il
suggestivo SETI@home
è "ibernato" dall'anno
scorso, ma altri sono ben attivi e molto
interessanti.
Lo studio della ionosfera e della sua influenza sul clima è il cuore del gruppo di ricerca HamSCI. La proposta include la realizzazione di una propria "Stazione di rilevamento meteo-spaziale" con SDR Tangerine, GPSDO, monitoraggio con WSPRnet e Reverse Beacon Network. Il congresso "virtuale" organizzato quest'anno da HamSCI offre una serie di conferenze davvero molto ricca e interessante. Con la registrazione gratuita si può entrare al più alto livello della ricerca in questo campo, mantenendo però un punto di vista da radioamatore. Gli argomenti in agenda vanno dallo studio della ionosfera misurando l'effetto doppler con l'aiuto di stazioni campione e GPSDO, alle indicazioni per realizzare la propria stazione con l'hardware e software fornito. Insieme alle discussioni su strato F ed E sporadico e la propagazione QRP in VHF, c'è l'invito a partecipare ad un altro progetto collaborativo: NASA Radio Jove. Non manca neanche una rassegna storica sulle attività dei radioamatori dal '900 ad oggi. Tutto si svolge su Zoom, venerdì e sabato 19 e 20 marzo, dalle 12.30 alle 22.30 UTC. Buona partecipazione!
 Video carino della NASA sulla ionosfera a carattere (molto) divulgativo su YouTube.
 |
claudio
Salve
Per chi fosse interessato
Claudio IK8LVL
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AIR - RADIORAMA |
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Posted: 21 Mar 2021 08:08 AM PDT
 Dear
friends,
solar
activity is finally increasing and provides
improved HF propagation conditions -
see our screenshot from this morning at
600+
(more than six hundred!) Kiwi-SDRs are now
available worldwide at
Enjoy!
Updated
radiofax schedules of Athens Funabashi Guangzhou
Hamburg Kagoshima Misaki et al can be
found on our website - see the 2021/2022
GUIDE TO UTILITY RADIO STATIONS subpage. What's
more, since publication (in December
2020) of the new 2021 editions of our books and
CDs and databases, hundreds of new digital data
decoder screenshots have been uploaded
to our hotfrequencies webpage: so far 1000+
(more than one thousand) since 1 December 2020!
We've
monitored and decoded thousands of fascinating
HFDL messages for decades, and from
locations all over the world. While state-of-the-art
CPDLC messages are widely used elsewhere, good old
Europe is still considerably behind ...
By consequence, from an engineering / technical
point of view, monitoring Agana Auckland Barrow
Hat-Yai Molokai Muan Riverhead
San-Francisco is far more interesting than Reykjavik
Shannon Telde. The new station Muan, in
particular, continues to be
extremely busy! What's more, due to the China
Virus Chaos and its containment - or
the total failure to do so by certain governments
just here -, there is much more air traffic within
(and between) America - Asia -
Pacific than in Africa - Europe.
Professional
digital data decoder systems such as PROCITEC's go2MONITOR
and WAVECOM's W-CODE provide post-processing
software routines for converting ADS-B
and CPDLC HEX messages et al. For example,
ADS-B:
/FUKJJYA.ADS.B-
78380724F41BA73A8908A5A91F172300AB84ECC90888AA0D24BBFBA2F50908810823B3
E3905E8908800E5430E2C0000F5511A1C000E7E8
results
in
DOWNLINK
FROM AIRCRAFT B-7838
ADS
message:
Periodic
Report
Pos.
:51°57.95'N, 164°23.74'E, 37000ft, H+40:10.250,
TCAS available,
Accuracy:
< 0.05NM, redundant
Fixed
Projected Intent Group
Latitude:
49°13.34'N, Longitude: 158°21.94'E, Altitude:
37000ft,
Projected
Time: 00:36:58
Predicted
Route Group
Next
: 51°39.45'N, 163°38.69'E, 37000ft, ETA: 00:04:24
Next+1:
50°12.41'N, 160°22.64'E, 37000ft
Earth
Reference Group
True
Track: (not validated) 237°, Ground Speed: 454kts,
Vert.Rate:
0ft/min
Air
Reference Group
True
Heading: (not validated) 239°, Speed: 0.836mach,
Vert.Rate:
0ft/min
while
CPDLC:
/GDXE1XA.AT1..B-
LXEA11F2D84F2BCC10952AD28925D84A956944934B3065D5A94E5F50CC0443E
results
in
UPLINK
TO AIRCRAFT B-LXE / 07:50:54 / MAINTAIN FL380 /
REPORT PASSING
TURDI
/ AT TURDI CONTACT YAKUTSK CONTROL / VHF 125.600
MHZ
FIR
codes used above, i.e. FUK and GDX, are listed at
and
general ACARS message labels are explained at
A
"manual" CPDLC HEX decoder for less sophisticated
decoding applications (so far it does
not work for ADS-B messages) can be found
e.g. at
Beyond
these features, SQL (Structured Query Language)
filtering of professional decoder
results allows precise selection of certain texts
out of hundreds of decoded messages.
Standard
aeronautical and telecommunication abbreviations
can be found everywhere, as are
four-letter ICAO location indicators and three-letter
IATA location indicators worldwide. You might
have noticed, however, that dozens
of very special abbreviations (such as
ADIRS
AHMS BTMS CIDS DFDAU EPESC FDIMU GPSSU HPTC LMTOGW
MACG PECS SDAC VGMX ...), referring to
the respective message text, are explained
exclusively on our hotfrequencies webpage. The
same goes for automatic data downlinks
such as altitude/lateral/vertical changes
and periodic reports. What's more, specific
Internet tutorials will enable you to easily
interpret standard FPLs, NOTAMs, and so on.
Best wishes - 73, Joerg Klingenfuss
Klingenfuss Publications
Klingenfuss Radio Monitoring
Hagenloher Str. 14
72070 Tuebingen
Germany
Phone +49 7071 62830
Fax +49 7071 600849
 via Bruno Pecolatto-AIR130
 |
claudio
Salve
per chi fosse interessato
Claudio IK8LVL
IR - RADIORAMA |
|
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Posted: 23 Mar 2021 10:43 AM PDT
 radiorama 110Nuovo numero di radiorama disponibile per il download https://www.air-radio.it/index.php/2021/03/23/radiorama-numero-110/
via Bruno Pecolatto-AIR130  |
claudio
Salve,
Per chi fosse interessato
ik8lvl claudio
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AIR - RADIORAMA |
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Radio Rugby: come ti accordo l'antenna Posted: 29 Mar 2021 06:52 AM PDT Nel 1926 il trasmettitore VLF di Rugby a 16kHz era ritenuto il più potente del mondo. Il finale composto da 54 valvole era raffreddato ad acqua con una tensione anodica di 12kV ed una corrente di 750A. Questo trasmettitore alimentava un sistema di antenne composto da 12 tralicci alti 250 metri. Ciascuno pesava 200 tonnellate ed aveva un ascensore all'interno. 43 km di conduttori di rame costituivano gli elementi radianti. La stazione GBR di Rugby era il mezzo per mantenere i contatti fino ai più lontani confini dell'Impero Britannico e funzionò fino al 1986. Fu un presidio strategico fino al termine della Guerra Fredda per i collegamenti con la Royal Navy ed i sottomarini. Ora rimane attiva soltanto per l'emissione dei segnali di tempo MSF a 60kHz. Ecco la bobina che serviva ad accordare l'antenna:
 Il sistema accordatore era composto da un trasformatore ed un variometro come induttanza variabile. La bobina fu smontata nel 2003 e si trova ora esposta al Science Museum di Londra. L'avvolgimento della bobina ha un diametro di 5,20m ed è disposto su 6 telai in legno con un albero centrale per consentirne la regolazione. L'accordatore nella sua condizione operativa originale: 
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Friedrichshafen 2021 cancellata Posted: 27 Mar 2021 03:53 AM PDT  L'organizzazione
sperava di non doversi arrendere come è successo
l'anno scorso,
 L'appuntamento è per il prossimo anno: 24-26 giugno 2022. Photo credits: ARRL
 |
claudio
Salve,
per chi fosse interessato
ik8lvl Claudio
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AIR - RADIORAMA |
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Posted: 06 Apr 2021 05:59 AM PDT In Nuova Zelanda tutto può essere eccezionale e sorprendente. Gary, ZL3SV, ha steso un dipolo di ben 640m tra due pini e lo ha alimentato con una linea bilanciata a 600 Ohm. 
Il balun (12:1), recuperato da un trasmettitore commerciale, è gigantesco: un enorme cilindro a bagno d'olio con una serie di grandi toroidi impilate. Due imponenti isolatori collegano la linea bilanciata e dei robusti scaricatori a punta si occupano delle extratensioni, od anche dei fulmini, quando dovessero capitare. Gary ha misurato accuratamente il balun ed ha rilevato una buona risposta tra 500khz e 40MHz.
Se vi chiedete la ragione della reticella avvolta intorno al cavo coassiale, non si tratta di una tecnica segreta, è solo un espediente per impedire alle sue capre di addentarlo. La
descrizione del maxi balun:
Il dipolo misura 320m per braccio. Il filo radiante che apparteneva ad una linea ad alta tensione, è composto da un nucleo di acciaio inox e uno strato esterno in alluminio per un diametro di 10mm. Ha un carico di rottura di 60 tonnellate.
La descrizione dell'antenna:
Nel confronto
con un dipolo a mezz'onda questa enorme
antenna appare molto più silenziosa ed avrebbe un
guadagno di 16dBd a 14MHz. Tuttavia, risulta
decisamente direttiva lungo l'asse longitudinale.
 Gary non
accende quasi mai il lineare e trasmette con 200W,
non è raggiunto dalla rete elettrica e alimenta la
sua grande casa con il fotovoltaico.
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