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Poruke - 9A4OE

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1
UKV tehnika / Odg: Novi VNA na Ebay-u
«  : 10. Listopad. 2019, 14:21:17 »
Marker na displayu koji pokazuje 52.5 ohma -j 44.2 je totalno na krivom mjestu.
Nacrtaj si tu poziciju na smith diagramu pa ćeš vidjeti da nešto ne štima na prikazu u tom mini VNA.

Može jedino značiti da je krivo kalibriran!

2
UKV tehnika / Odg: Novi VNA na Ebay-u
«  : 10. Listopad. 2019, 08:44:59 »
Dolazi i novi NanoVNA 2.0 koji će ići do 3.5ghz
Jedino što neće pokriti kratkovalno područje.

Molio bi profesionalce (instrumenti reda 10K $ i više) za razliku od nas amatera (instrumenti reda 100 $ i manje) kojima je ovo ipak hobi a susreću se sa novim mogućnostima primjene instrumenata  da pojasne
Impedance Matching with Parallel L and C u svrhu tumačenja priloga 9a5ay.

3
UKV tehnika / Odg: Novi VNA na Ebay-u
«  : 09. Listopad. 2019, 13:52:36 »
Drugi dipol je slabije optimiziran a to je vidljivo iz podatka 44,2nF, to bi ma MFJ-tu pokazalo X= -44,2
Kako protumačiti te podatke?
Minus nam govori da je reaktanca kapacitativna, ako bi htjeli antenu dovesti u rezonanciju na konkretnoj frekvenciji 3.714 MHz trebali bi dodati kapacitet (paralelno kondenzator) što se izračuna iz formule
1/(2*pi*frekvencijaHz*kapacitativna komponenta)

1/(2 π×3714000×44.2)2=0.000000000969518=970pF
u konkretnom slučaju 970 pF
ili možda griješim?
Da je prisutna induktivna komponenta induktivitet bi se dodao serijski

To je tema za raspravu a ne kojekakve ... ima tu podosta stručnjaka koji su u stanju da jednostavno objasne amaterima - početnicima, a ne da prosipaju "mudrosti sa visoka".

4
UKV tehnika / Odg: Novi VNA na Ebay-u
«  : 22. Kolovoz. 2019, 17:47:25 »
Na ebay-u ima više verzija ovog uređaja, pa je prilikom kupovine potrebno pripaziti koju verziju se kupuje. Naime, loši klonovi ovog uređaja uopće nemaju RF oklop oko ključnih komponenti.

To se posebno odnosi na klonove u bijelom kućištu.
Dobro je popratiti EEVblog i RadioMačku

5
Test / Odg: Meteo sateliti
«  : 21. Kolovoz. 2019, 09:36:57 »
Vidio sam i neke između 1.4 i 1.6 ghz.... Idu i ti iz EU ili?
Najlakše je primati
Sve što leti (Polar orbiting satellites) je moguće primati, stvar je u opremi i dekoderima za razliku od onih što pokrivaju samo određeni dio (Geostationary satellite) zemaljske kugle, pa ako nisi u zoni pokrivenosti badava ti sve.
Naglasak je na najlakše, za ove što lete na GHz prava osoba je Adam.
Dok je mene to interesiralo do HRPT dekodera nisam mogao bili su samo APT i oprema (prijemnik) nije bila baš dostupna. Pojavom RTL-SDR-a stvari su se malo promijenile.
NOAA-19 HRPT 1698MHz with HackRF + LNA4ALL + Pot antenna

6
Sateliti / Odg: Meteo sateliti
«  : 20. Kolovoz. 2019, 07:41:18 »
Najlakše je primati one što rade od 137 MHz do 138 MHZ iz porodice NOAA, tu je još i ruski Meteor M2 na 137.900 MHz.

7
Obavijesti / Odg: 2 m band u opasnosti
«  : 13. Srpanj. 2019, 17:53:57 »
O dva metra zasad ni riječi.

 CPG PTA 7
Prague, 17th - 21st June 2019

Date issued:    4th June 2019
Source:    IARU Region 1
Subject:    RNSS Proposal WRC-19 AI 10
Group membership required to read? (Y/N)



Summary:

CPG meeting # 8 considered a WRC-23 agenda item proposal in document CPG(19)088 (RNSS and Amateur service in 1240-1300 MHz) and tasked PTA to consider the matter further. The proposal invites a review and ITU-R studies "…leading to technical, regulatory and operational recommendations to the Conference, enabling that Conference to decide on effective measures to ensure the protection without undue constraints of RNSS (space-to-Earth) receivers by the amateur and amateur-satellite services".
At its last meeting PT44 in WG-FM also considered reports and preliminary studies (previously presented in PTA) on the susceptibility of RNSS receivers in the band 1240-1300 MHz to interference from the amateur service in the same range. Since the CPG meeting the IARU has continued to express support for a proposal made to WG-FM meeting #94 (FM(19)081-A6) following which WG-FM asked PT44 to continue to work on the topic in conjunction with WG-SE. IARU believes that the preliminary studies presented to CEPT (WG-FM, PTA and FM PT44) already offer good potential for developing opportunities for effective protection of the RNSS receivers.
At this time the IARU believes that WRC action would be premature and requests that it is not supported as a proposal for the WRC-23 agenda.


Proposal:
For now, the IARU believes that WRC action on this topic is premature. The documentation provided to date reports only one interference issue with a specific amateur application experienced at a Galileo control centre rather than in user devices. There is little knowledge about the characteristics of realistic deployment scenarios for user devices, how susceptible they might be to transmissions from other services in the field and how likely they are to experience interference from the Amateur service in the field. Proper account needs to be taken of the operational characteristics of the Amateur service in order to develop sensible and proportionate measures that will facilitate the continued utility of the band for amateur experimentation whilst respecting the primary status of the RNSS service.

The IARU respectfully requests that administrations do not support a WRC AI proposal at this time to allow:
a) Technical and regulatory studies in ECC WG-FM and SE to be finalised that can take into account a more complete understanding of the real likelihood for interference to user RNSS receivers in the field considering the propagation environments and operational characteristics of both services.
b) Time for gaining operational experience in the effectiveness of any regulatory measures that may be developed. 

Background:
The International Amateur Radio Union (IARU) represents the interests of amateur radio experimenters and operators worldwide. Amateur radio provides the possibility for people of all ages, gender and nationalities to gain practical hands on experience through the nationally regulated use of radio spectrum for the study and understanding of terrestrial and space wireless communications.  Indeed many radio amateurs who experienced amateur radio communications in their youth have used the skills gained for their technical and/or scientific careers in later life. (See: https://www.iaru-r1.org/index.php/web-links-sp-999616743).
The international amateur radio community has followed with great interest the successful implementation of European GNSS systems, in particular GALILEO.  The IARU understands and recognises the great opportunities that the system offers to Europe and the World at large. According to recent information one of  Galileo’s next major steps is the active utilisation of the GALILEO E6B/C signal offering dual-frequency accuracies (E1/E6) and a commercial service in the frequency range  1 260-1 300 MHz. This range sits within the global 1 240 – 1 300 MHz Amateur Service allocation in the international Radio Regulations (as well as other services).
This frequency range has been used for many years for technical investigations and experimental use by amateur stations for a range of applications. It is an important band for the Amateur Service as it sits at the boundary between lower frequency UHF and VHF bands for which there is a good supply of commercial equipment and the higher frequency microwave bands that require a greater degree of self-provision and experimentation. It is the technical challenge of this latter requirement that drives the interest and self-training in the use of these frequencies.
As a consequence of the importance of the band for the Amateur Service and the opportunities for coexistence suggested by the technical measurement campaigns reported by the German administration and the European Commission JRC, the IARU has spoken against the WRC-23 agenda item proposals made in the European WRC preparatory process (taking place in CPG PTA).  IARU believes that a WRC agenda item is not the most efficient means to develop the solutions and guidance to solve any coexistence issue between the GNSS and the Amateur Service. In modern times the limited radio spectrum resource has become more apparent as new applications and technologies make use of ever higher frequencies and there has been a growing emphasis on increased spectrum sharing to facilitate opportunities for all spectrum users where possible. The European Commission itself supports this approach in several cases through measures adopted under the Radio Spectrum Decision (Decision No 676/2002/EC of the European Parliament and of the Council of 7 March 2002 on a regulatory framework for radio spectrum policy in the European Community).
IARU is ready and willing to participate and contribute towards the development of appropriate and proportionate measures within the CEPT working groups that can facilitate successful coexistence that build upon the good work reported in the studies mentioned above.


8
Obavijesti / Odg: 2 m band u opasnosti
«  : 13. Srpanj. 2019, 17:49:22 »
European Common Proposals
PROPOSALS FOR THE WORK OF THE CONFERENCE


ADD   EUR/9AXX/4

DRAFT NEW RESOLUTION [EUR-B10-2] (WRC-19)
Studies on frequency-related matters, including possible additional allocations, for the possible introduction of new non-safety aeronautical mobile applications.
The World Radiocommunication Conference (Sharm el-Sheik Egypt, 2019),

   considering
a)   that the number of manned and unmanned aircraft equipped with sensors has grown significantly in the past 20 years;
b)   that the need for bidirectional low to high data rate communications between aeronautical stations and aircraft stations, or between aircraft stations is consequently increasing;
c)   that the considered communication data links implement channel bandwidths from some kHz up to some hundreds of MHz requiring to study frequencies in the VHF range up to 23 GHz.
d)   that these new aeronautical communications are not related to safety of flights;
e)   that there is no clear identification of those bands in which these new aeronautical communication systems may be developed with a sufficient level of confidence for long term investment by industry;
f)   that the decisions of previous conferences have introduced some restrictions to the use and have imposed constraints on the development of these communication systems within several existing mobile allocations traditionally used by the aeronautical mobile applications;
g)   that the existing mobile allocations which can be used by these communication systems have some limitations due to coexistence with other services in the band;
h)   that in Region 1, there are allocations to the mobile except aeronautical mobile service in some frequency bands which are allocated to the mobile service in Regions 2 and 3;
i)   that harmonized worldwide allocation would facilitate the implementation of these new aeronautical communication systems ;
j)   the only frequency ranges beyond 400 MHz, worldwide identified for aeronautical mobile applications other than those with the mobile allocation, those en route (R) or for telemetry are beyond 55 GHz as per N° 5.558;
k)   that an adaptation of the regulatory framework for further visibility, protection and development of non-safety aeronautical mobile applications may be required;

   recognizing
d)   that new allocations for the aeronautical mobile service in the range 144-174 MHz would extend the existing usage in the band 138-144 MHz and would ensure the possibility to  develop systems operating on a wider tuning range providing that the protection of the incumbent services is ensured;

   noting
a)   that the band 144-146 MHz is allocated to the amateur and amateur-satellite on a primary basis in all Regions;

        resolves to invite ITU-R
1   to study spectrum needs for new non-safety aeronautical mobile applications for air to air, ground to air and air to ground communications of manned and unmanned aircraft systems;
2   to study the bands 162,0375-174 MHz, 862-874 MHz and 22-22.21 GHz already allocated on a primary basis to the mobile except aeronautical mobile service, in order to evaluate the possible revision or deletion of the “except aeronautical mobile” restriction;
3   to study possible new allocations to the aeronautical mobile service in the bands 144-146 MHz, 5000-5010 MHz and 15.4-15.7 GHz, while ensuring the continued operation and the protection of existing services in the considered bands and, as appropriate, adjacent bands, and not constraining future development of these services;
4   to review studies in resolve 1 to 3 and elaborate regulatory measures for the possible introduction of new non-safety aeronautical mobile applications;
5   to complete studies in time for WRC 23,
   further resolves to invite WRC-23
to review the results of these studies and take appropriate actions,
   invites administrations
to participate actively in the studies by submitting contributions to ITU-R.



9
Microwave / Odg: Novi Meteo radar u Medulinu
«  : 12. Srpanj. 2019, 10:10:43 »
Vide se čak i brovodi u prolazu HI!

Nisu to brodovi!
A jel si siguran da nisu ?evo primjer prije par minuta:
Situacija sa sličnom siluetom.
Kad se objekti sa zaslona radara dovedu u realne okvire (mjere) brod dužine 4 km koji pređe put od 19 km u 10 minuta i na kraju nestane sa zaslona?

10
Microwave / Odg: Novi Meteo radar u Medulinu
«  : 05. Srpanj. 2019, 14:01:41 »
Vide se čak i brovodi u prolazu HI!

Nisu to brodovi!

11
Obavijesti / Odg: 2 m band u opasnosti
«  : 01. Srpanj. 2019, 14:08:19 »
Proposals on an Agenda item for WRC-23
Subject:
Studies on frequency-related matters, including possible additional allocations, for the possible introduction of new non-safety aeronautical mobile applications.
Origin: France
Proposal:
In accordance with Resolution [EUR-B10-2] (WRC-19), to review studies on spectrum needs, coexistence with radiocommunication services and regulatory measures for the possible introduction of new non-safety aeronautical mobile applications:
-   Spectrum needs for new non-safety aeronautical mobile applications for air to air, ground to air and air to ground communications of manned and unmanned aircraft systems.
-   Studies within the bands already allocated on a primary basis to the mobile except aeronautical mobile service above 146 MHz and up to 23 GHz in order to evaluate the possible revision or deletion of the “except aeronautical mobile” restriction. The following bands are proposed to be studied : 162,0375-174,000 MHz, 862-874 MHz and 22-22.21 GHz.
-   Study possible new allocations to the aeronautical mobile service in the bands 144-146 MHz, 5000-5010 MHz and 15.4-15.7 GHz, while ensuring the continued operations and the protection of existing services in those bands and, as appropriate, adjacent bands, and not constraining future development of these services.

Background/reason:
The number of manned and unmanned aircraft equipped with sensors has grown significantly in the past 20 years together with the need of bidirectional low to high data rate communications.
One can mention the following applications: fire surveillance, border surveillance, air quality and environment monitoring, traffic monitoring, disaster monitoring, terrain modelling, imagery (visible, infrared, radar, meteo), video monitoring… Such applications require communications identification, sensor control or synchronization and for access to ground databases.
Consequently the need of non-safety data communications between various types of aeronautical platforms exponentially increases.
At the same time, there is no clear identification of those bands in which non-safety aeronautical mobile applications may be developed with a sufficient level of confidence for long term use by the industry. In addition, the existing mobile allocations which can be used for non-safety aeronautical mobile applications have some limitations due to coexistence with other services in the band. Furthermore the decisions of previous conferences have introduced some restrictions to the use and have imposed constraints on the development of  wideband aeronautical mobile applications within some existing mobile allocations traditionally used by the aeronautical mobile applications.
In consequence an adaptation of the regulatory framework for further visibility, protection and development of wideband non-safety aeronautical mobile applications is required. Use of innovative sharing methods may be considered to ensure the protection of existing services while offering the possibility to have access to new frequency bands. The sharing methods could consider, for example, to take into account the separation linked to the altitude of the aircrafts or power control. In addition, the access may be supported by effective tuning ranges and may be authorized depending on national circumstances and spectrum policies.
Several frequency bands are proposed for investigation within different ranges  in order to meet the various operational requirements for new non-safety aeronautical mobile applications. Implementation of separation distances for such aeronautical systems or pfd limits or others regulatory measures may be envisaged.

Radiocommunication services concerned: MS and AMS

Indication of possible difficulties:
Protection of existing services within the bands and adjacent bands allocated to the mobile except aeronautical mobile service.
Protection of existing services within the bands and adjacent bands proposed for a new allocation to the aeronautical mobile service.

Previous/ongoing studies on the issue: no recent studies for aeronautical mobile applications, other than those for related to safety.

Studies to be carried out by: ITU-R WP5B
   with the participation of:
ITU R Study Groups concerned: SG-4, SG-5, SG-6, SG-7

ITU resource implications, including financial implications (refer to CV126):
This proposed agenda item will be studied within the normal ITU-R procedures and planned budget.

Common regional proposal: Yes   Multicountry proposal: No
Number of countries:








vezano za 23 cm
 CPG      Doc. PTA(19)078
CPG19 PTA-7
Prague, Czech Republic / 17-21 June 2019
   
Date issued:    5 June 2019
Source:    France
Subject:    WRC-23 Agenda Item on the protection of RNSS from amateur emissions in the band 1240-1300 MHz
Group membership required to read? (Y/N)

Summary:
Contributions submitted at the April 2019 meeting of CPG PTA provided measurement results that examined the effect of interference from the amateur service to Galileo receivers in the band 1260-1300 MHz.
In view of :
   the geographical extent of interference cases already met, with amateur stations distant from Galileo receivers by several tens of kilometres, despite very limited Galileo test receiver deployment
   the planned ubiquitous deployment of Galileo receivers using the E6 signal,
   the use of the band by other RNSS systems such as QZSS (Japan) and Compass (China), and Glonass in the band 1240-1260 MHz
France shares the European Commission view that a WRC-23 agenda item is necessary to address the issue to avoid undue burden on administrations that would otherwise have to deal with each interference case individually.
The new agenda item focuses on the review of the usage of the band 1240-1300 MHz by the amateur service and the RNSS, and proposes that technical, regulatory or operational measures are determined and then decided by WRC-23 to ensure protection of RNSS receivers.
Proposal:
CPG PTA is requested to consider the attached proposal, and to take it into account in its work on a European Common Proposal for WRC-19 Agenda Item 10.
Background:
WRC-2000 allocated the band 1260-1300 MHz to RNSS (space-to-Earth), and WRC-03 decided the complete regulatory framework. Today, the RNSS systems: Galileo, Glonass, Compass, and QZSS share the band 1240-1300MHz with amateur radio.
Although Galileo receivers are not yet widely deployed, several cases of interference into Galileo receivers from the Amateur Service have been identified at a number of sites. The interfering amateur stations were located and shutdown, but significantly in one case, the interfering amateur station was 60 km away, and all cases took several hours or even days to be identified.
Galileo is close to full operational capability and the E6 signals will support new services such as the free-to-use Galileo High Accuracy Service and authentication, expected to be used by a variety of applications including autonomous vehicles and Internet of Things (IOT). There is therefore a serious concern that cases of interference by amateur stations will rapidly grow in number, and it is hence necessary that this issue be addressed in a timely manner at WRC-23.
Note that this proposal was discussed recently at the CPG19-8 meeting in Stockholm (20-24 May 2019), which tasked CPG PTA to consider it further, together with other possible contributions on the same subject. In parallel, a new work item on this RNSS-Amateur coexistence issue was recently discussed by WG FM in view of the development of an ECC Decision, and WG SE would be requested to initiate technical work.

12
Obavijesti / Odg: 2 m band u opasnosti
«  : 27. Lipanj. 2019, 08:23:44 »
Prema informacijama samo DL je bila protiv ovoga?!?!? Zvuči nevjerojatno... ali izgleda istinito...

Zanimljivo tko je do sada uopće službeno reagirao od navodnih zaštitnika RA spektra.

 CPG      Doc. PTA(19)INFO12
CPG19 PTA-7   
Prague, 17-21 June 2019   
   
Date issued:    15 June 2019
Source:    EURAO
Subject:    Respect 144-146 MHz band allocated in primary basis to Amateur Service
Group membership required to read? (Y/N)



Summary:
EURAO wants to convey the concerns of the global radio amateurs community about the recent proposal from France to reconsider the 144-146 MHz band as a primary allocation to the Aeronautical Mobile service, nowadays allocated to Amateur Service in primary basis, and express its firm commitment to work so that it continues as before.
Proposal:
Reject to include in WRC-23 agenda any item about reallocating the 144-146 MHz band to any other service than Amateur service.
Background:
The European Radio Amateurs’ Organization (EURAO), a recognized stakeholder and observer of CEPT/ECC, represents the interests of radio amateurs in Europe, and beyond. More than a hobby, Amateur radio is a good way to allow people, no matter the age, gender or nationality, to learn about technology, keep in touch with other cultures, ways of thinking, practice solidarity, develop personal and professional skills, carry out joint projects with schools, universities and companies, etc.

No doubt Amateur radio is also of great help in: developing countries, emergency communications, health, education, etc. Without going further, some of EURAO members carry out an outstanding work in this sense: with children, with indigenous communities, with migrants, etc.

144-146 MHz is an small segment of VHF, known as 2 meters band. It is the most popular band among radio amateurs, with lots of users, equipments and infrastructure world wide: analog and digital repeaters, ballons, beacons, satellites, ISS, moon bounce communications, emergency networks, unmaned stations, etc.

In the last week EURAO received many comments and concerns from a lot of radio amateurs, not only from Europe, because any modification in this band at ITU level may affect all radio amateurs worldwide.

For this reason EURAO is of the opinion of not reconsidering the 144-146 MHz band in the WRC-23 agenda.



i



Ladies and Gentlemen

We are very aware of the need in frequencies of the professional operators and of Thales's request, but it is this day impossible to envisage the division of the band 144-146 MHz in region 1, 2 and 3 and
220-225 MHz in region 2. 144-146 MHz is assigned to the radio hams in exclusive primary status, 220-225 in secondary status. These bands are strongly used by the set of the radio hams of the world, 144-146 MHz is one of first bands exploited by all the radio hams including the novices and the beginners. The ease of exploitation and the cost reduces in fact a band very easy to use.

We are not technically afraid of the arrival of the uses that wish Thales, but we can assert that whatever is the technology that they will use, the transmissions Earth-air and Air-earth will not be reliable.

We use, for more than 10 years, these connections Earth-air and Earth-space during flights of stratospheric balloons and during connections with the space station ISS, with any sorts of sensors which pass on their data on the ground in VHF, we also pass on orders to the sensors and we can assert with certainty that these transmissions are widely disrupted by the other close emissions VHF. Our transmissions not having the necessity of being reliable 100% are made low power because the brilliance at high altitude is important, they limit themselves unless 5 flights a year for a duration of 3:00 am by operation, thus the cohabitation is possible because we announce our experiences and the radio hams collaborate easily and remain attentive to these projects which we make with schools.

In Thales's project, the cohabitation is impossible and unthinkable. It is necessary to know that we use directive antennas with strong earnings, we can reach more than 2000 watts PAR, and being given the reach of the VHF which can go to 500 km, see 2000 km during the contacts with ISS, it is inconceivable that the traffic radio ham stops every time a plane passes in the perimeter of a radio ham. Thus it is reluctantly that we have to refuse the request of Thales's cohabitation on bands radio hams whatever is the status which will be proposed to them.

Having consulted the set of the radio hams and their associations, we ask you by the present not to put in the agenda of the CMR-23 Thales's request on the portions of bands VHF assigned to the radio hams.

We thank you beforehand for being willing to consider our request.
Please accept, Ladies and Gentlemen, the expression of our distinguished feelings

For board of the URC, FFBRA and WHRO
Sylvie Delassus.
Marc Chamley ANTA
With the support of the DR@F

--
73 de Sylvie F1PSH
www.radioamateurs.urc.asso.fr


13
Obavijesti / Odg: 2 m band u opasnosti
«  : 27. Lipanj. 2019, 07:20:38 »
Navodno iza toga stoji ova kompanija.

15
Microwave / Odg: NOVA POZIVNA FREKVENCIJA NA 13CM BANDU
«  : 20. Lipanj. 2019, 19:00:57 »
Document number: VIE19 C5-012
Source: Michael Zwingl, OE3MZC, OeVSV, President
Subject: 2400 MHz NB segment to protect geostationary Amateur Satellite service
(ESHailSat2)
Committee(s): C5
Summary: Currently our 2400 MHz band plan does also recommend to use 2,400-
2402 MHz for narrow band contesting in countries that do not have access to a lower
segment in the 2,320 MHz DX segment. To avoid interference we think the
conference should reconsider this standing recommendation in the VHF handbook.
Introduction
In December 2018 the first geostationary Amateur Radio Satellite has been launched successfully.
Background
The EsHailSat2 will be geostationary overlooking ITU Region1 with transponders to offer
communication for a large community of radio amateurs. This will include a narrow band uplink
frequency in the 2,4 GHz range and downlink in the 10,490 MHz segment.
Key points and proposal
Since the geostationary orbit of this new satellite will attract many new users, it is also to expect many
more transverter kits for CW/SSB to be around that cover 2400MHz with significant power. Currently
our band plan does also recommend to use 2,400-2402MHz for narrow band contesting in countries
that do not have access to a lower segment in the 2,320MHz DX segment. To avoid interference we
think the conference should reconsider this standing recommendation in the VHF handbook.
Recommendation:
We therefore propose to change the narrow band DX segment to start from 2401MHz to avoid
interference, but still benefit from the increased activity on this band.

https://vienna.iaru-r1.org/conference-documents/c5/

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