17 Octombrie 2017
   
Marți, 24 Ianuarie 2017 02:12

Securitatea Comunicatiilor Radio

   De-a lungul anilor ca si consultant tehnic in alegerea Sistemelor de Comunicatii Radio am intalnit destul de multe brese, greseli crase ori sisteme slab pregatite/performante/depasite.
 Multe companii/institutii au ales sistemele de comunicatie "cu dedicatie" ori in necunoastere totala. 
   Trebuie sa plecam de la premiza ca orice sistem poate fi spart mai devreme sau mai tarziu dar exista un avantaj major atunci cand este "mai tarziu".
  De cativa ani piata radio abunda de  terminale radio ieftine care pot fi cumparate pe mai nimica atat de pe site-urile de profil cat si Ebay ori local pe O*X etc.. Nu mai punem la socoteala  site-urile destinate Radioamatorilor, oameni care numai amatori nu sunt in ale radiocomunicatiei.    

      Sarind peste unele institutii ca MAI care are  pus la punct un sistem  destul de sigur de comunicatie radio ( destul de scump si uzat moral) am sa ma opresc la  agentii economici mari si mijlocii , institutii publice, firme de protectie si paza, hoteluri si preferatele mele, Aeroporturile.
   

  Aici am sa ma opresc  putin si sa spun ca nici un om cu minte la cap nu ar putea folosi o portabila PMR intr-un serviciu  aeroportuar. Dar la noi se intampla.
 Nu mare mirarea mi-a fost anul trecut sa aud intr-o frecventa radio PMR apropiata de ce-a a paznicilor de la Metro angajati ai aeroportului preluand oameni, bagaje, vorbind despre alimente, sosiri/plecari etc. Si nu mare mi-a fost mirarea sa aud intr-o frecventa radio foarte apropiata (ori armonica) a unei firme de taxi alti angajati ai aceluiasi aeroport vorbind despre zboruri, aterizari,conditia pistei ori mentenanta.
   

      Aici intervine un sistem de comunicatie sigur daca nu Tetra macar DMR. Acest sistem este folosit in foarte multe tari cu succes si datorita usurintei in utilizare dar si pretului destul de mic pentru un echiament profesional.(Asta daca nu e Motorola si platesti 50% din suma pentru Brand).
  La noi in Romania acest sistem gandit pentru Comercial a fost adoptat mult mai repede si mai usor de Radioamatori ( ca si in majoritatea tarilor, dar despre asta alta data) nu de catre consumatorul targetat.
     Avantajele unui sistem DMR sunt net superioare, TIER III fiind echivalent cu TETRA, unde nu mai punem la socoteala pretul echipamentelor care care sunt destul de accesibile pentru cine doreste Securitate in Comunicatiile Radio si putin peste buzunarul unui utilizator clasic de Baofeng cu care stie el (si cam are dreptate) ca poate asculta multe.

Duminică, 10 Aprilie 2016 07:03

DV Raspberry PI hotspot DMR radio

 Jucarii destepte pentru oameni mari.
  De foarte mut timp mi-am dorit sa pot folosi reteaua DMR-MARC dar nu am reusit decat ocazional datorita zonei fara acoperire unde ma aflu.

  Totusi am incercat sa caut solutii ,convins fiind ca retelele DMR vor lua avant si se vor dezvolta pe zi ce trece.   Dupa teste si teste m-am oprit la modulul DVMEGA  pe care pusesem ochii inca de anul trecut si urmaream proiectul.

 M-as bucura sa vad cum incep sa prinda si la noi retele DMR, mai ales ca acum preturile sunt destul de accesibile si echipamentele se inmultesc pe zi ce trece. Acum este disponibil si in Romania.


Pe scurt ce stie sa lucreze:

D-Star
DMR+
DMR BrandMaster
Private call
Group call

in curand:
SMS
GPS
RRS/ARS

Marți, 05 Mai 2015 19:47

Quantun QP-2100 DMR

  Multi spun ca este o copie dupa CS700, o fi si asta nu e neaparat de rau. CS 700 este destul de cunoscuta,versatila si apreciata in comunitatea DMR. Eu am aflat destul de tarziu de cei de la Quantun.

   Dupa specificatii nu pare o statie rea si as alege-o fara ezitare din multitudinea de statii DMR cheap.

    Specificatiile producatorului sunt:

Key Features
Frequency Range: 400-470 MHz UHF / 136-174 MHz VHF
4/5 W
1,000 Channels
12.5 KHz Channel Spacing
DTMF & MDC 1200 PTT ID
CTCSS/DCS Tones Allowing For Individual Calls and Group Calls
Wired Clone Feature Allows For Easy Transfer Of Features From One Radio To Another
VOX Operation With Hands Free Communication (With Appropriate Audio Accessories)
High Capacity 2000 mAh Li-Ion Battery
Follows IP-65 Standard With A High Level Of Protection Against Water Damage And Dust
Military Specifications 810 C/D/E/F
Password Protection
Alphanumeric Keypad
Scan
Text Messaging (Digital Mode)
Late Entry
Private Call, Group Call, All Call
Feature & Status Annunciation
Battery, Antenna, Wall Charger & Charging Cup Holding Strap & Belt Clip Included In Standard Package

Use Time-Division Multiple-Access (TDMA)
Digital technology which doubles the number of users on a single licensed 12.5 kHz channel. In compliance with the DMR digital protocol.

Dual Mode Operation
Operate in both Digital & Analogue mode, allows easily migrate from analog to digital, providing clearer voice communications in digital mode, throughout the coverage area.

Multi-Communication Operational
Versatile calling, it supports Private call, group call and all call in digital mode.

Signaling
Build in CTCSS/DCS signaling in Analog mode.

Tri-color LED
The tri-color LED allows for notification of Tx & Rx status, as well as calling and scanning.

VOX (Optional)
Allows for hands free communication when used with one of the many appropriate accessories we carry for hands free communication.

PC TUNING AND FIRMWARE UPGRADE
PC tuning simplifies the maintenance and tuning of the radio by allowing both to be done via PC. Firmware can be updated easily to add new features.

Emergency Alarm & Man Down (Optional)
Is an emergency alarm feature which transmits from the radio when the button is pushed in case of an emergency. Man Down is optional but can transmit an emergency signal if the radio is positioned in a horizontal position for a long period of time.

Channels
Up to 1000 channels in digital mode.

Battery
Up to 40% longer battery duration.

Military Specifications
Radio is constructed with military specifications to protect from damage against vibration and shock to increase durability of the radio. Alphanumeric Keypad & Display Allows for text messaging in digital mode and features a display for call monitoring and other features.

 Pagina oficiala a producatorului : aici

Duminică, 29 Martie 2015 16:02

DM-R89 portable DMR 4FSK radio

   Un nou model al celor de la LISHENG este in curs de aparitie . DM-R89 portable DMR 4FSK radio pare destul d einteresanta in primul rand frecventelor de lucru : VHF:136-174MHz,UHF:400-470MHz,350-390MHz,450-520MHz, care o face destul de versatila in ceea ce priveste utilitatea pe piata.

    Pe pagina oficiala in chineza modelul este prezent dar pe varianta engleza nu. Specificatiile arata ca ar avea autorizatiile  FCC si EU, asa ca sunt sanse sa apara si pe piata EU.

   Daca vine si cu un pret bun este de luat in seama. Specificatiile producatorului:

1. analog mode
2. digital mode
3. analog + digital mode
DMR Tier 2 Mototrbo System, DM-R89 portable DMR 4FSK radio
 

 
Product Description

Digital Mobile Radio(DMR) is an open digital radio standard produced by European Telecommunication Standards Institute(ETSI). Being capable of voice, data and a range of others fatures and applications in conventional and trunking mode. It maximize the use of spetrum resources. In a great degree, its competitive price are preferred by the users who like digital technique. Its analog + digital modes supply users a buffer stage to transfer from analog to digital radio mode. Our digital Portable analogue motorola standard LS-H760 DMR radio already get highly reputation from all over the world, its stable performance, and compatabile with MOTOROLA will supply you more choices, should it interest your markets, contact us now. Below is more functions and features:

DMR Tier 2 Mototrbo System, DM-R88 portable DMR 4FSK radio functions and features:

1.Three operation modes: digital mode/analog mode/digital+analog mode. It is compatible with current analog system, ensuring a smooth analog-to-digital transition.
2. Announce the channel number and the current battery capacity
3. TOT.
4. VOX.
5. Battery Saver
6. Scan and Priority Channel Scan
7. Channel Lock
8. Programmable funstion
9. Encryption

Analog Mode
1. Bandwidth 25KHz/12.5KHz
2. Modulation Type: FM
3. Support standard/non standard CTCSS/DCS
4. Busy Channel Lock-out

Digital Mode

1. Bandwidth: 12.5KHz/6.25KHz
2. Modulation Type: 4FSK
3. Vocoder Type: AMBE++/SELP both compatible
4. 32 Bit Voice Encrption (Optional)
5.  Support group call and individual call, you can program multiple group call numbers at the same time.
6. Transmitting permission setup.
7. This radio is capable of color code setup.

Standard accessories:

Li-poly Battery (1800mAh) *1pc,
Desk-top Charger *1pc,
AC Adaptor *1pc,
Rubber Antenna *1pc,
Belt Clip *1pc,
Hand Strap* 1pc,
User Manual *1pc

DMR Tier 2 Mototrbo System, DM-R88 portable DMR 4FSK radio technical specifications:
General
Frequency Range   
VHF:136-174MHz
UHF:400-470MHz,350-390MHz,450-520MHz  
 Channel No.     1000
 Channel spacing     Analog: 25/12.5KHz, digital:12.5/6.25KHz
Working voltage     7.4v Rated
 Battery capacity     2000mAh(Li-ion)
 Frequency Stability     ±1.5ppm
 Antenna Impedance     50Ω
 Dimension     129*61*33mm
 Weight     285g with battery/antenna
 Digital vocoder type     AMBE+2C/Qinghua SELP
Transmitter 
 Power output   
VHF(high): 5W
VHF(Low): 1W
UHF(high): 4W
UHF(Low): 1W
 FM Modulation   
11kφF3E at  12.5khz
16kφF3E at  25khz
4FSK digital modulation   
12.5KHz Data only: 76φFXD
12.5KHz Data & Voice: 7K6φFXW
 Spurious Emission   
-36dBm<1GHz
-30dBm>1GHz
 Modulation Limiting   
±2.5KHz at 12.5KHz
±5.0KHz at 25KHz
 FM Hum&Noise   
40dB@ 12.5khz
45dB@ 25KHz
Adjacent channel power   
60dB @ 12.5khz
70dB @ 20/25KHz
 Audio response     +1 - -3dB
 Audio Distortion     ≤5%
  Receiver
 Sensitivity(Analog)     0.2μV(12dB SINAD)
 Sensitivity(Digital)     0.3μV/BER5%
 Selectivity     60dB@ 12.5KHz/ 70dB @ 25KHz
 Intermodulation     65dB @ 12.5/20/25KHz
 SNR   
40dB @ 12.5KHz
45dB @ 25KHz
 Conducted Spurious Emissiona     -57 dBm
 Rated Audio Power Output     1W
 Rated Audio Distortion     ≤5%
 Audio Response     +1~-3dB
 Enviromental Specifications
 Operating Temperature Range     ~30°c ~ +60°c
 Storage Temperature Range     ~40°c ~ +85°c
 ESD   
IEC6100-4-2 LEVEL4
±8KV Touch discharge
±15KV Air Discharge
 U.S.MIL     MIL-STD-810C/D/E/F
 Humidity     As per MIL-STD-810C/D/E Standard
 Shock&Vibration     As pwer MIL-STD-810C/D/E/F Standard

 

Luni, 23 Februarie 2015 19:14

DM 8000 DMR Radio


  O portabila DMR care mi-a atras atentia este DM-8000 de la KST. arata binisor ci conform specificatiilor nici nu e slabuta. SI nici foarte scumpa nu este. De multe ori ma tot uit la enormitatea de modlee aparute peste ocean si compar cu necesitatile de pe aici.

    Piata de vanzare ar fi la noi, de la 500-1000$ preturile de aici ca 150-400 in afara e ceva. Chiar daca pui  vama si restul. Ar fi mai multi radioamatori cu tehnologie mai noua.

    Specificatiile producatoruluii si o mica fotogtrafie :

 

 

 

 

     Model DM-8000

Frequency range
400~470MHz, 136~174MHz
Channel Capacity
1000
Normal Operating Voltage
7.2V
Operating Temperature
-30°C~+60°C
Store Temperature
-40°C~+85°C
Weight
270g
Dimensions:H x W x D(mm)
113.5 x 54 x 33.5
Battery Life in 5/5/90 Operating Mode5/5/90
2300mAh Standard Li-ion battery
Analogue:15 houses Digital: 20hours
Transmitter
Frequency
400~470MHz,136~174MHz
Channel Spacing
12.5KHz
Frequency Stability
+/- 1.0ppm
Power Output
L:1W, H:4W
Hum and Noise
-40dB @ 12.5KHz
Conducted, radiated spurious emission
-36dBm @ <1GHz, -30dBm @ >1GHz
Adjacent Channel Power
-60dB @ 12.5KHz
12.5KHz:11K0F3E
4FSK Digital Mode 4FSK
12.5KHz(data only):7K60FXD
12.5KHz(data+voice):7K60FXE
Modulation Maximum Deviation
2.5KHz @ 12.5KHz
Nonactive Slot Power
-57dBm
Audio Response
+1dB ~ -3dB
Audio Distortion
= 3%
Digital Protocol
ETSI TS 102 361-1, -2, -3
Vocoder Type
AMBE+2™
Receiver
Frequency Range
400~470MHz, 136~174MHz
Channel Spacing
12.5KHz
Frequency Stability
+/- 1.0ppm
Analog Sensitivity
0.35uV/-116dBm(20 dB SINAD)
0.22uV/-120dBm(Typical)
Digital Sensitivity
0.3uV/-117.4dBm (BER 5%)
0.7uV/-110dBm (BER 1%)
Intermodulation
TIA603C:70dB ETSI:65dB
Adjacent Channel Selectivity
TIA603C:65dB @ 12.5KHz
ETSI: 60dB @ 12.5KHz
Co-Channel rejection
12dB@ 12.5KHz
Spurious Response rejection
TIA603C:75dB ETSI:70dB
Conducted spurious emission
-57dBm@ < 1GHz,-47dBm @ > 1GHz
Blocking
84dB
Rated Audio Power
1W
Audio Response
+1dB ~ -3dB
Rated Audio Distortion
= 3%
GPS Optional
Sensitivity
= -130DB
Cold Start
= 1 minute
Hot Start
= 10 seconds
Horizontal Accuracy
= 10 meters
vhf uhf fm transceiver, Two-Way Radio, Walkie Talkie, Handheld Transceiver, 2 way radio, Interphone

Main function/ Features:

 1. Use Time-Division Multiple-Access (TDMA) digital technology which doubles the number of users
2. on a single licensed 12.5KHz channel. Comply with the DMR digital protocol.
3. Operate in both Digital & Analogue mode,allows easily migrate from analog to digital
4. Provides clearer voice communications in digital mode,throughout the coverage area
5. Private call,group call and all call in digital mode
6. Text message in digital mode
7. Integrates voice and data to increase operational efficiency
8. Enhanced call management features include emergency,call alart, radio check,radio enable/disable
9. Transmit admit criteria
10. Build in CTCSS/DCS signaling in Analog mode
11. Up to 1000 contacts in Digital mode
12. Dual priority channel scan operates in both analogue/digital mode
13. VOX(Optional)
14. GPS(Optional)
15.Vibration reminds when receiving text messages and voice call(Optional
16. Up to 40% longer battery duration
17. IP65 water Resistance & Dust Protector
Standard Accessories in the package
Radio+ Battery+ Antenna+ Belt Clip+ Operation Manual+ Battery Changer+ Adapter
Applications
    Service industry(Hotel, Restaurant, Supermarket, etc);
    Security, Property Management;
     Police, Firefighters, Education, Public Utilities;
    Constrution Sites & Transportation;
    Warehouse, Ports & Logistic Industry;
    Manufacturing industry

 

 

 

Joi, 12 Februarie 2015 23:47

DMR-8100H

 

    Am vazut astazi o noua portabila DMR. Ma bucur ca apar.Cu cat sunt mai multe cu atat ai de unde alege si sunt mai ieftine.

  M-as bucura enorm ca reteaua DMR sa ia amploare si in Romania, mai ales in randul radioamatorilor. Tetra mai tarziu. Sper ca o parte din terminalele DMR sa apara si in Romania.

 

 

 

 

 

 

Specificatiile producatorului:

Product Description

Features of Professional dmr digital radio dmr-8100h :

Item: 1.8-inch color LCD vhf / uhf digital dmr radio dmr-8100h
1.Voice coding algorithm:Single-chip solution for Vocoder,Baseband Modem, Communication Protocol Stack and CentralPrpcessomg; with the multi-band excitation (AMBE + +) vocoder thatconform with European standard, it can communicate with compatible models.

2. Analog/Digital auto-adaptation:Support both analog and digitalmoder and automatic adaptation.

3. Enhanced Call Management:Includes Emergency Alarm, CallPrompt, Remote Monitoring, Single Call, Group Call,All Call,Remote kill,Remote Halo,Resurrection, Radio Checking Function,etc.

4. Compatibility:Compatible with existing analog radio andrepeater witheout any hardwate change. Compatibelr with CTCSS,CDCSS analog signaling type.

5. Automatic recording:Built-in Voice recording module cansupport up to 60 minutes voice record for checking in anytime.

6. Professional Digital Encryption:with 128-bit Fixed Key DigitalEncryption Technology in digital mode. different keys can be usedfor each user group to ensure the privacy of every groupL In analogmode, with the Scrambling Encryption Technology, the communicationsecurity is fully protected.

7. Alarm Function: Alarm Tone.Transmitting alarm tone to other radios.Tone alarming as well as transmitting the alarm tone to other radios.alarm prompt.

8. Low-High TX power: 1w/5w selectable.

9. Avariety of signaling: support DTMF/CTCSS/DCS/5-tone/MDC1200 (in Analog Mode)

10. VOX Function: with Storag Delay Transmitting Technology,the voice is stored first, then it is transmitted after a time delay,which can avoid the complicated operation and vocal lost.

11. Scanning Function: support Channel Sequential Scanning andChannel Scanning setting.

12. TDMA Duplex function: support duplex communication In direct/transit mode(12.5KHZ band width). or two calls at the same time

13. Dual-slot Pseudo Trunk: In direct/transit mode, with Dual-slotDynamically Allocated Technology, the free time slot can be assignedto the group members who need communication.

14. Large-size color LCD: 1.8-inch color LCD, It is still clear even under bright sunlight.

15. software upgradable.

16. support Data communication.

17. Support short message service

DMR-8100H is a new generation professional DMR that developad on the basis of the basis of theEuropean Telecommunications Standards Institute (ETSI) DMR protocol standards.it uses asingle-chip solution (SB3500) to Integrate the Vocoder, Baseband Modem, Communication ProtocolStack and Central Processing, and support many hi-tech functions such as digital voice, data transmission in public security, airports, oil fields, and other industry and business sectors.Experts in Network Communication Solutions

Technical Specifications of Professional dmr digital radio dmr-8100h :
General
Frequency Bands VHF:136-174MHz UHF:350-400/400-470MHz
Channel Capacity:1024CH
Channel Spacing:12.5KHz(Digital) 25KHZ(Analog)
Operating Mode:Simplex,Half Duplex
Battery:2000mAh(Li-Ion)
Frequency Stability:±1.5ppm
Multiple Sccess Mode:TDM
Power Supply Voltage:7.4V(Battery Capcaity:2050mAh Li-icn/Ni-mh optional)
Battery life:13 hours (Analog) 18 hours (Digital)
Dimension(H*W*T):125mm*55mm*37mm
Weight:350g
Material of Case:PC

Transmitter
Output Power:1W/5W
Modulation limiting:±5KHz@ 25KHz/±5KHz@ 12.5KHz
Rated Frequency Deviation:±3KHz@ 25KHz/±1.8KHz@ 12.5KHz
Audio Distortion:≤ 3%
Audio Response:6dB +1, -3dB per octave
FM Modulation:12.5KHZ11KOF3E/25KHZ16KOF3E
Residual FM:-40dB@ 12.5KHZ/-45dB@ 25KHZ
Adjacent Channel Power:≤-60dB@ 12.5KHZ/≤-70dB@ 25KHZ
Clutter Emission:≤-60dB@ 12.5KHZ/≤-65dB@ 12.5KHZ
4FSK Dogital Modulation:12.5KHz data only:7K6DFXD/12.5KHz data & Voice:7K6DFXD
Digital Vocoder Type:Built-in Vocoder or External AMBE++ Vocoder

Receiver
Sensitivity:0.25µV(12 dB SINAD) for analog/0.3µV(5%BER) for digital
Adjacent Channel selectivity:≤-65dB @ 25KHZ/≤-60dB @ 12.5KHZ
Intermodulation Immunity:≤-65dB @ 25KHZ/≤-60dB @ 12.5KHZ
Clutter Suppression:≤-65dB @ 25KHZ/≤-60dB @ 12.5KHZ
Audio Distortion:≤3%
Signal to Noise Ratio:≤-40dB @ 12.5KHZ/≤-45dB @ 25KHZ
Audio Response:6dB+2 -8dB per octave
Rated Audio Output:50mW

Environmental Indicator
Operating Temperature:-25°C—+60°C
Storage Temperature:-40°C—+85°C
ESD:IEC61000-4-2 (Level 4)/±8KW(Contact)/±15KV(Air)
U.S Military Standard:MIL-STD-810C/D/E/F/G
Water and dust intrusion:IP54/IP67
Humidity:Per MIL-STD-810C/D/E/F/G
Shock and Virbration:Per MIL-STD-810C/D/E/F/G

Duminică, 21 Septembrie 2014 20:40

Hytera PD355 & PD365

 

  Mici si foarte mici.Asa sunt noile modele de statii DMR de la Hytera. Pot fi folosite cu succes acolo unde se preteaza necesitatea transmisiilor radio protejate. Marimea conteaza. In cazul acesta dimensiunea redusa este un plus.
 Informatii complete  PD355 si PD365

 

Vineri, 21 Noiembrie 2014 17:10

QYT D68 UHF

  Multi clienti mi-au cerut statii portabile sau mobile care sa asigure o cumunicare cat mai sigura si fara interfernte din partea altor persoane. Majoritatea statiilor UHF/VHF avand CTCSS/DCS mare branza nu poti proteja.

   O solutie buna ar fi statiile DMR si DPMR in functie de mediul in care trebuie utilizata. Pana de curand acet tip de statii nu existau decat sub forma de Statii profesionale si cu pret destul de piperat (Motorola).

   Au aparut si statii ieftine pentru uz personal ori intr-o firma care are nevoie de trafic radio protejat.QYT D68 este una din ele. Nu face mai mult decat trebuie pentru conditii de lucru restranse si semiprofesionale. Nici nu costa mult.

 



Specificatiile producatorului:

Main Features:

High/Low power selective
Single call, Group call, All call function
Voice prompt
Monitor
32 channels
Low power alarm
SQL
VOX function
Wide/Narrow bandwidth selectable
Lone work
Channel scanning/Priority scanning
End-tone elimination
Emergency alarm
Programmable multifunction key
TOT
Voice encryption
Talk around
Digital and Analog combined

Specification:
Item number
D68
General

Frequency Range
400-480MHz
Channel Spacing
12.5Khz, 25Khz
Operating Temperature
-20°C+50°C
Channel No.
32
Antenna Impedance
50Ω
Operating Voltage
7.4 V
Antenna connector
SMA-F
Audio Output Power
≤1000mW@16Ω
Dimension(W x H x D)
114x60x33mm
Battery
1600mAh Li-ion
Weight(With Standard Li-ion battery)
285g

Receiver
Sensitivity
≤-177dBm (Ber≤5%)
Co-Channel rejection
≥-12dB
Adjacent Channel Selectivity
≥60dB
Spurious Response rejection
≥70dB
Intermodulation
≥65Db(ETSI)
Blocking
≥85dB
Conducted spurious emission
Antenna 9Khz-1Ghz  ≤-57dBm
1Ghz-12.75Ghz  ≤-47dBm
Transmitter
Output Power
High: ≤5W   Low: ≤2W
Frequency Stability
± 2.5 PPM
Adjacent Channel Power
≤-60dB
Free Time Slot Power
TDMA: ≤-57dBm
Spurious Radiation
Antenna:9KHz-1GHz , ≤ -36dBm
1GHz-12.75GHz , ≤-30dBm
Modulation BER(Bit Error Rate)    ≤5%

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