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Statii portabile pentru Ucraina

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34 replies to this topic

#19
AWE

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View PostAlltrack, on 01 martie 2022 - 16:44, said:

T92 bat dublu , 5 km intre case

5 km prinzi cu case situate pe linia dintre locatiile celor 2 statii? Ma cam indoiesc, sincer, in afara cazului in care ambele sunt situate la inaltime, gen pe o casa sau ceva de genul...

#20
Alltrack

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Te indoiesti degeaba . Problema e sa stii una...alta , cum tii statia , cum se propaga undele , sa stai intr-un spatiu mai liber .
Ai dreptate daca tii statia paralela cu pamantul , daca vorbesti din casa , sau daca te bagi langa zidul casei sau cu cladire inalta in fata . Sunt multe informatii !

Edited by Alltrack, 01 March 2022 - 17:23.


#21
andreic

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View Posteiffel, on 01 martie 2022 - 13:47, said:

Depinde de conditiile atmosferice si pozitionare - in oras pot sa fie limitate si la doar cateva sute de metrii in zona cu blocuri daca mai si ploua. Sunt si interferente...
In camp deschis pe zi senina da, e posibil sa mearga si ceva zeci de km, in special la munte.
Sunt diferente intr-adevar dar in general nu se limiteaza cum cred unii la sub 2km din start, practic aia e o medie in zone urbane cu blocuri, poate sa fie mai putin sau mai mult, cum ziceam daca cineva monitorizeaza comunicatiile din avion si esti intr-un sat de campie care de regula se comporta ca spatiu deschis sigur o aud de la ceva distanta Posted Image

Uite un test acu 13 ani facut in Bucuresti in zona cu vile destul de inalte si ceva blocuri... de la sol -> Vf Omu cu scula antica da buna, doar 1.5W setat la emisie pe VHF Posted Image
[ https://www.youtube-nocookie.com/embed/kDCaJmOBH1A?feature=oembed - Pentru incarcare in pagina (embed) Click aici ]

Gasesti pe canal si test cu Cozia/160km similar. Ideea era alta, daca eu ajung cu 1.5W la 120km la 2500m altitudine, pai de la inaltimea unui avion ma duc usor 250-300km deci daca rusii au un echivalent rusesc al awaks sigur pot auzi.

Edited by andreic, 01 March 2022 - 17:46.


#22
AWE

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@Alltrack: cand am zis ca ma indoiesc, m-am referit la faptul ca 1-2km in zone urbane necesita anumiti parametri respectiv o anumita pozitionare. Este posibil, dar ce faci daca esti in miscare? Ai mers 5 metri mai la dreapta si ai ajuns in spatele unei cladiri, gata cu receptia aia buna :) Daca sunt puncte fixe si ai cat de cat line of sight, da, e altceva.

#23
Alltrack

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@AWE , de acord , eu m-am referit la distante maxime , pe probe reale . Desigur e nevoie si de cunostinte minime de transmisiuni , pentru maximizarea parametrilor .
In orase cu cladiri inalte distantele scad dramatic .

#24
luci_flash

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Era bun topicul asta ieri.
Noi am mers pe T82. 10 seturi. Azi ajung la ei.

#25
eneagud

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View Postluci_flash, on 01 martie 2022 - 19:39, said:

Era bun topicul asta ieri.
Noi am mers pe T82. 10 seturi. Azi ajung la ei.

Si noi, asa am putut lua mai multe.

#26
Leo2006

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Pe repetor nu e problema. Are ditamai antena. Ascult cu UV-82 discutiile radioamatorilor prin repetor direct cu statia pe masa.

Edited by Leo2006, 01 March 2022 - 21:31.


#27
laffin

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cica rusii merg si fara criptare. am reusit sa ma conectez la un nod sdr in ucraina, am reusit sa inregistrez cateva conversatii. dar probabil sunt de la taximetristi Posted Image)

https://k0lwc.com/mo...inian-conflict/

Edited by laffin, 01 March 2022 - 22:50.


#28
Leo2006

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https://www.hotnews....l-ucrainean.htm
Un luptator cecen cu o statie Baofeng UV-82 prinsa la gat.

Edited by Leo2006, 02 March 2022 - 08:08.


#29
eiffel

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View Postandreic, on 01 martie 2022 - 17:32, said:

Gasesti pe canal si test cu Cozia/160km similar. Ideea era alta, daca eu ajung cu 1.5W la 120km la 2500m altitudine, pai de la inaltimea unui avion ma duc usor 250-300km deci daca rusii au un echivalent rusesc al awaks sigur pot auzi.
Pai PMR-urile mai mult de 500mW nu au voie din cate stiu.
Asa e regula in EU.

#30
vestale

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In conditiile de razboi de acolo nu mai conteaza limitarile PMR de putere la 0.5W si antena nedetasabila. Putere cat mai mare, 4W in UHF, dar sa poti salva si canale cu putere mai mica (1W au 0,5W) sa mai salvezi din baterie, antene cu ceva castig si o chestie care se mai uita, compatibilitate cu alte statii, e de mers pe scramble sa fie compatibile, e de schimbat o baterie cu una incarcata sa ai de unde alege. Setat o frecventa pentru RX si alta pentru TX, daca sunt echipe de 2, daca e mai mare e de mers pe simplex.
De pe statii portabile si cu puteri de PMR (0.5W) si frecvente mai jos, dar in aceeasi banda de UHF, am vorbit din Creasta Fagarasului in Creasta Calimanilor si Creasta Muntilor Nemira. Mergea foarte bine cu putere legala in frecventele respective si am micsorat puterea pana la cat de jos puteau statiile.
Cu doar 50mW tot de pe statiatie portabila, dar printr-un repetor aflat la 1900m am vorbit de la 120km distanta.

Edited by vestale, 02 March 2022 - 10:25.


#31
AWE

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View Postvestale, on 02 martie 2022 - 10:24, said:

In conditiile de razboi de acolo nu mai conteaza limitarile PMR de putere la 0.5W si antena nedetasabila. Putere cat mai mare, 4W in UHF...

Asa este, dar cu cat folosesti putere mai mare, cu atat bateria se duce mai repede. Intre 0.5W si 4W e diferenta destul de mare la consum si in caz de razboi, nu stiu cat de accesibile sau functionale sunt prizele de unde le poti incarca :)

#32
vestale

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Important si sa ajunga mesajul de comunicat si sa apuci sa ajungi la priza. Degeaba ai bateria plina, pentru ca ai emis cu putere mica, daca nu te aude "colegul" sa te acopere/apere/sustina si nu apuci sa mai pui la incarcat acumulatorul.
Sunt modele mai noi ce au incarcare si la USB, oricum incarcarea dureaza ore.

#33
laffin

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ce criptare, bai nene, astia sunt in epoca de piatra. i-am prins si eu de acasa cand trimiteau codurile.

[ https://www.youtube-nocookie.com/embed/KaXTp92KfRI?feature=oembed - Pentru incarcare in pagina (embed) Click aici ]

#34
strongsss

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asta mi se pare si mai tare, apropo de criptare.
Forţele ruse ar avea probleme cu sistemele de comunicaţii securizate. Şi le-ar fi compromis singuri, după ce au distrus stâlpi de telefonie

#35
bonou2

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What Radios Are Ukrainian Military Using?

Communications are essential for any military operation. So what kind of radios are being used by the Ukrainian military on the ground?
I know what you’re thinking — it must be Baofeng radios, right? Not so fast.
Prior to 2015, Ukraine used a variety of different analog radios to accomplish their mission.
Their comms included Soviet-era radios that were extremely outdated.
The main challenge was finding replacement part availability.
Ground troops in Ukraine used a combination of Icom, Kenwood and Baofeng radios in the field.
All of these were analog and did not offer the Ukrainian military the ability to encrypt their communications. That’s a serious strategic disadvantage.
In 2015, Ukraine began a contract with Dolya, a professional radio communications company based in Kyiv, Ukraine. Dolya brought the Ukrainian military into the 21st century with equipment from U.S. manufacturer Motorola.
They’re now using VHF (136-174 Mhz) Motorola MotoTRBO radios, in addition to HF radios for over-the-horizon communications.
What radio is the average Ukrainian military soldier using?
Ukraine soldiers that are not communications leaders are issued a Motorola DP2400.
The Ukraine military calls this a ”battlefield radio.”
It has no screen or keypad, just a two knobs.
This is done for simplicity sake giving the soldier the easiest to use radio in the field of battle.

What radio does the Ukraine military radio specialist carry?
Some Ukrainian soldiers in the field are issued the Motorola DP4600.
This model features a screen and a half-keypad which allows soldiers to send and receive text messages in addition to voice communications.
They also provide the ability to see unit numbers of the station transmitting via the screen.

What radio do Ukrainian communications platoon commanders carry?
The lead communications specialists in the Ukrainian military carry the Motorola DP4800.
The Ukraine military call these ”management stations.”
This unit features a screen and full keypad. It offers up more control to change zones and talkgroups allowing greater communication flexibility. It can even remotely kill radios on the network should they fall into enemy hands. Battalion commanders are only given a limited number of these units as they chance to mess up communications goes up drastically given the admin power these units carry.

Ukrainian military units also carry the Motorola DM4600 mobile radio mounted inside of a metal case and mounted in various military vehicles.
This extends the range of communications when HTs just won’t cut it.
They have vertical antennas and directional yagis to help extend range.

Can you monitor Ukraine military during the ongoing war?
The short answer is no.
The Ukraine military is using 256-bit AES encryption with their strategic communications on the ground.
No scanner will be able to decode these transmissions.
They do use analog Vertex radios for secondary communications that are not encrypted, but those may be in limited use right now given the Russian invasion.
If you’re nearby and lucky enough to hear transmissions in the clear, I would be looking from 150-174 MHz, but I doubt you’ll hear much.

Want to learn more about Ukraine military communications?
Ukraine put out a 60-minute documentary talking about their upgraded communications where they discuss why they changed to Motorola. However, any ham radio operator should know the benefits are massive.

[ https://www.youtube-nocookie.com/embed/0O1WCTfDjsQ?feature=oembed - Pentru incarcare in pagina (embed) Click aici ]

sursa:https://k0lwc.com/wh...military-using/

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