Crt ss6900n programming. SS 6900 radio pdf manual download.

Crt ss6900n programming. Alpha 10 Max MA-1000.

Crt ss6900n programming rar/ Radio amateur station CRT SS 6900 VOX CB, AM, FM, USB, SSB, CW, PA, 28-29. The CRT Super Star 6900N . Anyway, Ive learnt a bit about the software recently and I've been told that the work group drop menu, is for programming multiple users, with slightly different options item 2 CB HAM RADIO CRT-SS6900N USB PROGRAMMING CABLE & SOFTWARE FOR OLD VERSION CB HAM RADIO CRT-SS6900N USB PROGRAMMING CABLE & SOFTWARE FOR OLD VERSION. Attention, to program the CRT SS 6900N it is necessary to open the station to connect the cord to the plate (User confirmed). New superstar 6900 Cb radio. USB programming lead » CRT SS6900N help programming » diy ss6900n programming cable » Anytone ARES / radioddity QT40 programming lead? » qrm eliminator ptt lead. . I le A Facebook group for CRT SS 6900 radio operators to connect and share. Thank you buddy really helps. Only 5 left in stock (more on the way). 9 x 2. com/G5STUmore. 00 Description -PROGRAMMING SOFTWARE Download Here TTI TCB 5289 SOFTWARE Download Here TYT PRODUCTS SOFTWARE DOWNLOAD HERE ALINCO DR135 DX 10 13EL121 Radio Addict Posts: 618 Joined: 16 Sep 2008, 20:55 Call Sign: 13DA121 Location: Germany CRT SS6900V Programming Software. Also some tips for beginners new to CB radio. SuperStar SS7900. It contains schematics and component layouts for the RF, echo, and CPU item 3 USB Programming Cable Superstar CRT SS6900N SS7900N HAM 10M 11M CB radio lead USB Programming Cable Superstar CRT SS6900N SS7900N HAM 10M 11M CB radio lead. 32 The 7th generation CRT SS 6900 N V is the latest version of this fully featured amateur radio HF mobile transceiver which is pre-programmed the the 10m amateur band (28. Designed for seamless PC connectivity, it allows quick frequency setup and channel customization. 065 to 26. com/fseuxTwitterhttps://twitter. Voici les principales fonctionsMerci et à bientôt. facebook. WHICH MAKES THESE RADIOS FOR CRT AND One of the best starter SSB radio. Matter of fact I have had many galaxy's, and they WERE good at one time. 3 Press No repeater shift (you need to use the programming software to get that to work), Strong unwanted mixer products, forget about approvals of any kind, No external USB socket for programming, No decent schematics MOST OF THE ANYTONE DOWNLOADS CAN BE FOUND HERE ANYTONE AT 6666 PRO Description -PROGRAMMING SOFTWARE Download Here ANYTONE AT 5555N_II_V3. Supplied with: USB programming cable CRT with CD. CRT SS6900N. Scroll down this page and find different programming options for the 6900. Post by Slayer » 15 May 2021, 16:56. Admiral Legend Posts: 10119 Joined: 08 Mar 2011, 21:20 Call Sign: 26TM157 Location: MK-UK Been thanked: 2 times. Not the best conditions on SSB this day. kr197. 49. Below we’ve some links where you 1 Hold down both the Func and SRF buttons whilst switching the radio on, 1 band should be displayed. Frequency range: 28. 4 x 10 inch; Notes; Frequency coverage: 10 m band, 28 to 29. A, reprogram the bands to 10 meters only using the programming software and the compatible cable. Brand. Updates and new (menu) functions are: Software allows to program frequency range limits, frequency channels, Mic Gain limits, factory reset function, CW side tone frequency and volume, RB holding time and much more. Model: Superstar 6900N SS6900N - CRT France; Seurre; Dimensions (WHD) 200 x 60 x 255 mm / 7. Update 28th Feb 2024 **CRT SS6900 export version 7** **Note to get software to work do Part 1 first** **CRT SS6900 export version 7** Frequencies: 240 channels en Mhz :25. The SS6900N is basically a 5555, so the mic wiring procedure is exactly the same as for the Anytone etc. 7Mhz, ASQ, RF Gain, Roger Beep, 12V, programmable Multi Band - AM / FM / USB / LSB / CW / PA - Program cable connector on the back - Extra vent All thanks goes to Gary for his help in this adjustment of the CRT SS 6900N CB RADIO. 4 metre USB Cable & Version 7. Top Gun Quad-5. UK RADIO CABLES (3532) Business Registered as business seller. 01CRT-TX000991. You can manage, edit and print out the radio data on a PC, and transfer data back to the radio or share with others. 0 out of Same as the Anytime AT-5555. CRT-SUPERSTAR. files Fri Mar 19, 2021 11:19 pm: John 68CT045 wrote: I just uploaded this for you Seller: g0oyq-steve ️ (29,418) 99. USB Programming Cable for Alpha 10 Max MA-1000 Anytone AT5555 Aquário PX-80 Avanti Grande Comtex CX1000DX CRT SS6900N Hannover BR9000 Intek HR5500 Kenwood TH-9000 K-po DX5000 Maas DX5000 Superstar SS6900 SuperStar SS7900 Syncro Impala Top Gun Quad-5 Voyage BR-9000 This programming cable allows quick and easy The CRT SS 6900 V7 is including the RX noise reduction option, NRC (extra PCB inside the radio). Manufacturer Warranty. Share. Equipped with a SWR Meter, Clarifier, and Squelch, this transceiver ensures protection against high TOS, voice Access the CRT 4CF user manual online or download the PDF file. 0 Software Download for the CRT SS6900V. It's been a great performer and a decent introduction into modern transceivers. the cable for the SS 6900N take of the speaker lid, and near the front is a connector where you connect the cable for the 6900 to pc computer, once connected you need to load up the software on pc for programming the rig, if you have a date file, top left corner of the software on pc you will see file and edit, open the file dat you want to install, and write to the » CRT SS6900N help programming » crt 6900n bad tx audio » crt ss6900 n on cb want to put on 10 meters » CRT 6900n help: Permissions in this forum: You cannot reply to topics in this forum: Charlie Tango 11m DX Radio Group Forum :: Help and Discussion Forums :: Multimode, Export and Sideband Radio: CB RADIO in the UK. Welcome to the world of new CB radios. Options: Programming cable + software; Microphone type selection: electret or dynamic Visit my online store for your Programming cables Click here- Steve G0OYQ Ham Radio Cables Shop> USB Drivers Windows Click here- Prolific-v1. Anyone know where i can download the software to program a superstar ss-6900n ver 6 have got cable but cant find disk ??? CRT SS 6900 User Manual View and Read online. SKU. item 3 USB Programming Cable and Software for CRT SS Superstar 6900V 7900 V NEW VERSION USB Programming Cable and Software for CRT SS Thank you for choosing this CRT vehicle transceiver CRT always provides high quality products,Though friendly 81 Flexible menu functions and PC programming software to meet varied customer demands 91 ECHO Function 111SQ, ASQ Function (FM and AM mode only) 111RF GANI ADJUSTMENT 12 RF PWR ADJUSTMENT hi guys I have a new crt 6900n 10m mobile set, i bought the programing cable and software to open it up from 25mg to 30mg all mode but i haven't got a clue how to open it up on the computer CRT SS 6900NV - 10-Metre AM/FM/SSB/CW Mobile Transceiver (blue version / v. £14. Had the ss9900 and didn't like the many menus and how easy it was to mess up the frequency programming. 99. The new SS 6900 The kit includes software and a cord to connect the PC to the CRT SS6900. re: crt ss-7900 programming help needed Post by Mikel » 19 Dec 2020, 12:59 WARLOCK wrote: ↑ 19 Dec 2020, 10:19 Thanks for the advice Mikel but as for the dealer in Cornwall have bought many things from him in the past and have had no problems . 7%, Location: Hull, East Riding of Yorkshire, GB, Ships to: WORLDWIDE, Item: 123257570647 USB Programming Cable for CRT SuperStar SS 6900N SS 7900 N. CRT SS6900N version 6 service manual HI all and thanks in advance, I have a SS6900N V6 pre-programed 11m with UK40 channels on band F, was wondering if I can switch to the 10m and back again to the. Windy_Miller Top CRT SS6900N. Although this The CRT SS6900N does it again with local CB chat on sideband and a 1300 KM contact to Italy on just 20 watts. 99 Ships within 14 - 21 days of order Features. 105 MHz for export purposes) Modes AM / FM / LSB / USB / PA Programming cable for SS6900N/7900 CRT stations. 49 kr 197. Topics manualzilla, manuals, Old, Science and Education, Radio, , Collection manuals_contributions; manuals; additional_collections Item Size 17. 615 - 28. Do you prefer the latest generation of rigs and antennas or do you like the classics? Get access to software for ham radio at https://getstationmaster. Addeddate 2021-06-29 01:57:23 Identifier manualzilla-id-7304372 Identifier-ark ark:/13960/t72w49q3d CRT SS6900N V6 PROGRAMING HELP NEEDED. Subject: Re: CRT SS 6900 N Fri Nov 05, 2021 1:50 pm: Programming the radio is easy BUT the crt program will not set the last two digits and will be set to 00. 93. This is the place to discuss any general CB radio related topics. A forum for the discussion of matters of a technical nature. barefootindian Super Member Posts: 203 Joined: 30 Dec 2011, 17:56 USB programming cable for the CRT SS-6900, SS-6900N and SS-7900 mobile station. 505 band c: 26. CRT - crt-ss-6900n-v6-service - Free download as PDF File (. Equipment Used: CRT SS6900N Age: 53: Subject: Re: SS6900 dat. The home of ALL things Radio - CB, 11m DX, Amateur, PMR446, PLD, Network and Data. Read more. This guide covers safety, operation, and programming of this transceiver, including details on its many features such as 199 memory channels, multiple encoding/decoding options, and scanning View and Download CRT SS 6900V user manual online. The CRT SS 6900 NV is a 10-meter Mobile Transceiver with features to enhance your communication experience. Setting the mic gain via menu options on the CRT SS 6900 N 10m CB radio. TX Noise Gate. SS 6900 Radio manuals and instructions online. The clarify control on the CRT SS 6900N can confuse new and old radio users. A 2019 SS6900N and a brand new Dynascan AT5555. CRT SS 6900 User Manual (22 pages) 10 meter radio. 4M . All the best. CRT SS6900N + microphone KPO NM532 + 1/2 wave without GP. 5%, Location: Aberystwyth, GB, Ships to: GB & many other countries, Item: 196280215308 USB Programming Cable CRT Superstar SS3900 SS6900N SS7900 SS8900 SS9900 11M CB. Post by JibberJabber » 29 Mar 2021, 09:48. A 10 meter ham radio often used for CB use. 1 year. 955 band d: 26. Please note: The software will be sent via email on completion of The kit includes software and a cord to connect the PC to the CRT SS6900. A look at the Superstar CRT 6900N. $21. Program cable connector on Comparison. zip> CRT Superstar SS-9900 Version 4 Software Click here-> 50800273390004. CRT SS 6900V CRT SS6900N help programming: Information and Guides: 15: ghoshy2014: 5681: Wed Jan 17, 2024 5:46 pm ghoshy2014 diy ss6900n programming cable: General Chat: 7: aleksandar: 1771: Wed Sep 20, 2023 12:51 pm bigvito CRT SS6900N V7 - Reprogramming software - Error: Multimode, Export and Sideband Radio: 8: CRT SS 6900 Owner`s manual. 0 Program cable connector on the rear panel; Extra ventilation; DIMMER; Specifications: 28-30 MHz frequency range (expandable by software 25. com) Then you can download a folder with the DAT files from here. With its cutting-edge technology, this software allows users to easily tune in to various frequencies and enjoy crystal-clear sound quality. Addeddate 2021-06-28 11:38:40 Identifier manualzilla-id-7320751 Identifier-ark ark:/13960/t2g854z11 re: crt 7900v turbo dat file Post by lambrettadave » 06 Sep 2023, 20:18 I think the easy way to do this is to get the radio connected to the computer and and save a. Topics manualzilla, manuals, Old, Science and Education, Radio, , Collection manuals_contributions; manuals; additional_collections Item Size 14. You can manage, edit and print out the radio data on a PC, and I'm sure I read somewhere that the SS6900 uses different programming software than the Anytone/Maas/K-PO etc. CRT Superstar SS7900. In this video i show how to change the standard CRT 6990N Roger Beep (or is it Bleep) to something sounding a bit like an old school radio. Anyone with a ss6900n and a lead can make a data file very easily. CB RADIO CRT Superstar 6900n " 5 HI " warning explained and how to switch it off. RX compander. rar/ CRT Superstar SS-6900 Software Click here-> CRT_SS6900_V1-V6. Sent from and sold by Amazon. 000-29. com/plumachauInstagramhttp Now installed in my shack - 12 Apr 2012 CB HAM RADIO CRT-SS6900N USB PROGRAMMING CABLE & SOFTWARE FOR OLD VERSION. Does Not Apply. Add to Wish List Add to Compare. USB programming cable for older version 11/10M radios with J5 programming connectorinside radio on PCB. Thanks for replying. » CRT SS6900N help programming » crt ss6900 n on cb want Easily program your CRT SS-6900 / SS-9900 transceiver with this USB programming cable. CRT SS6900 Programming The place to talk about specific radios, equipment and accessories. The 99 I had, and the 98 I have now display the same problems. Dynascan At5555 & CRT SS9900. 7) CRT SS 6900V - 10-meter mobile transceiver (AM/FM/SSB/CW) with VOX function and CTCSS/DCS. in radio amateurs 28. USB Programming Cable for CRT Superstar SS3900(2023+ model), SS6900, SS7900, SS8900, SS9900 and more! You can Read/Write radio data, CRT SS9900 Programming Software. Subject: ss6900n usb programming lead Fri Apr 30, 2021 6:58 am: Version 6 software programming utility. Availability: In stock. WHICH MAKES THESE RADIOS FOR CRT AND COME WITH PROGRAMMING CABLE INCLUDED!! SS6900n v7 The SS6900 is a 10M band multimode transceiver that is PC programmable to Share your videos with friends, family, and the world Seller: g0oyq-steve ️ (29,407) 99. The CRT SS6900n The CRT SS6900n is a cheap/entry level CB/10 meter radio with FM, AM, SSB and CW modes, frequency display, SWR meter, variable output and more than enough power output (around 12W/AM, 40W/FM and 30W/SSB). M Re: crt ss6900 10 meter radio anyone here tried one? Royal0014, Thanks, but NO thanks. Qty: Add to Cart. Charlie Tango 11m DX Radio Group Forum: Would you like to react to this message? Create an account in a few clicks or log in to continue. 965 CRT SuperStar ss6900n mike wiring HELP needed. 305 Mhz Modes: CRT SS 6900 Operators | Update 28th Feb 2024 Thank you for choosing this CRT vehicle transceiver CRT always provides high quality products,Though friendly design for user, this transceiver is technically complicated and some features may be new to you. 80. Subject: Re: CRT ss6900n 10 meters Mon Aug 29, 2022 12:04 pm: Hi Vince, There are two ways of doing this. So can you help me. Compatible with CRT Superstar SS3900 SS6900 SS7900 SS8900 SS9900. We aim to dispatch all parcels within 24hrs. Features: Compatible with CRT SS-6900 & SS-9900; Fast & Easy Programming via USB; Official CRT Software Included (Windows) Plug & Play Setup; Package Includes: CRT SS6900N multimode 10m radio, can be expanded to work on CB (11m) bands. We welcome all radio enthusiasts of all knowledge levels. 20. Related Products. 615-30. Hi, just throwing this out there on the off chance, Does anyone have or can make a Data file for the UK 40 channels. EAN. Explore features like memory channels, CTCSS/DCS, scanning, and frequency hopping. 615 to 30. CRT SS6900V USB Cable & Software. So you won't be able to use any version of it on your radio. Thanks I just uploaded this for you SS6900N V6. PNI PC50 Programming Cable for CRT 6900/7900 Stations Black. Re: CRT SS6900 V6 HIDDEN MENU. USB Programming Cable and Software for CRT Superstar SS6900 SS7900 SS8900 SS9900. Comtex CX1000DX. PC PROGRAMMING CABLE FOR CRT 2M, CRT 4M, CRT 7M AND CRT SPACE -- SOFTWARE on request and under conditions -- Add to cart View. Radio amateurs CRT SS 7900 V TURBO CB, SSB, AM, FM, LSB, USB, SSB 28-29. txt) or read online for free. Seller: fez_2005 ️ (3,642) 99. Whilst we try our best to ship same day, we cannot guarantee delivery time. Wireless Range. Top. Tweet. Download CRT SS 6900 PDF manual. Features: . USB Programming Cable Superstar CRT SS6900N SS7900N HAM 10M 11M CB radio lead. Advertisement. View and Download CRT SS 6900 user manual online. USB Programming Cable for. The USB cable is specially designed for programming CRT 6900 and CRT 7900 stations. cheers. USB programming cable. Crt Ss 6900n v6 Service - Free download as PDF File (. 60 Channel Programmable; AM / CW: 1-12W (adj); FM: 2-40W (adj); USB / LSB: 0-30W (adj) ASQ - Automatic Squelch; RF Gain; NB/ANL/Hi Cut Noise Filter; Roger Beep; 10 Khz; Echo; Variable Power; AM/FM/SSB/CW Modes;. I don't see myself getting rid of this rig, it's absolutely perfect for my needs right now. Micro type selection : electret or dynamic. DELIVERY. Foundation exam tomorrow so hopefully moving onto other radios in the near future. Summary of Contents for CRT SS 6900V Page 3 RESTRICTIONS Page 4 directive RED 2014/53/EU and answers the European standards of télécommunication EN 62368-1, EN 62311, EN 301 489-1/-15, EN 301 783. We are normally able to dispatch parcels SAME DAY where orders are received before 2. Getting started, installations, operation etc. Although this transceiver has been available under various brands, the SS6900 is improved version with better features and We have 1 CRT SS 6900 manual available for free PDF download: User Manual . sorry will only program for programs 1 or 2 for the first batch no programming cable & software program 1 the radio is supplied pre programmed band a: 25. 7Mhz, ASQ, RF Gain, Roger Beep, 12V, CTCSS, DCS, programmable. Which runs about $220 new or so. CRT SS 6900 User manual. Amazon Customer. B, There is a combination of buttons to press on reset that you can chose to put it in 10 or 11 meter mode. You will have to find the actual 6900 software. You'll have to go through every channel [muppet band] and use the clarifier to tune the 25 in. 6M . You will however receive tracking details as soon as The Superstar SS6900 software is a leading radio software known for its advanced features and user-friendly interface. Allows you to easily program the frequencies of your CRT talkie and program it from a computer. A great all round radio for getting back into SSB CB Radio. PNI-PC50. CRT radios are being bought a lot these days, sales based on price, features, cost and with this comes always the questions about software. 2 Turn the main channel selector 1 click so 2 band is displayed. Greg Programming cable for CRT SS 6900/9900 transceivers. Retrouvez mois sur Facebook https://www. Requires a PC running Windows 2000 / XP / Vista / Windows 7 with a free USB port. WARLOCK Top Poster Posts: 1414 Joined: 04 Jun 2008, 08:27 Call Sign: 26TM134 Location: cambridgeshire. Alpha 10 Max MA-1000. Registered as a business seller. Ref. To ensure that you use the radio to the fullest, please read this manual carefully before installing and using your SS 6900 Radio. Superstar SS6900. The SUPERSTAR SS6900 10M BAND TRANSCEIVER (PC PROGRAMMABLE) The latest arrival from Superstar, the SS6900 is a 10M band multimode transceiver that is PC programmable to give expanded frequency range and customised features. 6 bands of 60 Find many great new & used options and get the best deals for CRT Superstar SS6900N 10M Mobile Transceiver - Blue at the best online prices at eBay! Free delivery for many products! item 6 USB Programming Cable Superstar CRT SS6900N SS7900N HAM 10M 11M CB radio lead USB Programming Cable Superstar CRT SS6900N SS7900N HAM 10M 11M CB radio lead. Whether you are a professional radio operator or an amateur enthusiast, the Superstar SS6900 software is designed to meet Equipment Used: CRT SS6900N, RTL-SDR Blog V3, Baofeng UV5R-3. I didn't like the channel knob as occasionally it would skip a channel. A 1. Slayer Regular Posts: 17 Joined: 18 Dec 2020, 16:54 Call Sign: 2E0UKS. Welcome to the Charlie Tango DX Group. Alinco DX-10 DAT file (forumotion. 1 dat files dont work. Est. Brand: CRT Programming by Computer (Option) 19. 105 MHz. PC PROGRAMMING CABLE FOR CRT SS 6900, CRT 6900N , CRT 7900-- SOFTWARE on request and under conditions--€25. USB Programming. 700 Mhz). £16. 515 to 26. Unfortunately I can't remember the CRT SS 6900 has additional functions such as: Micro-gain, ANL filters, emergency channels, scan, integrated TOS, adjustable echo function, mid frequencies 10 Hz, 100 Hz, 1 kHz or 10 kHz. 00pm Monday to Friday. There is a + voltage going to pin 4, so when wiring any after market mic don't connect pin 4 CB Radio Help. 00 Tax included Add to cart Product Details Description Reference TX 000008 PC PROGRAMMING CABLE FOR CRT SS 6900, CRT 6900N, CRT 7900- I've grown to love the CRT now. 700 MHz. All such activities are undertaken at the readers discretion and own risk. 055 band b: 26. New features on Version 7 (CRT SS 6900 N V): CTCSS/DCS. Re: CRT SS6900 dat files? Find many great new & used options and get the best deals for CRT Superstar SS6900N 10M Mobile Transceiver - Blue at the best online prices at eBay! Free shipping for many products! item 2 USB Programming Cable for CRT SuperStar SS 6900N ss 7900 N USB Programming Cable for CRT SuperStar SS 6900N ss 7900 N. 000 - 29. And we are having problems with programming the receive. 75. PROGRAMMING CABLE USB CRT MICRON. kamsatcb (47746) Business Registered as business seller. SS 6900V radio pdf manual download. £22. Programming cables. 615 to 26. Software sent by email @+ Claude It loads into the CRT software but when you come to programming the radio it just say wrong version arrrgggg O well nearly done my own now . The store will not work correctly in the case when cookies are disabled. or if anyone CRT SS6900V All Mode 10 Meter Mobile $249. pdf), Text File (. Cable 100 cm ***DUE TO THEIR REDICULOUSLY HIGH SHIPPING CHARGES FOLLOWING BREXIT WE NO LONGER SELL CRT PRODUCTS*** HAVE A LOOK AT OUR ANYTONE VERSION. This version is V6 of the famous Anytone AT5555 wich is comercialized under Electronics service manual exchange : schematics,datasheets,diagrams,repairs,schema,service manuals,eeprom bins,pcb as well as service mode entry, make to model and chassis correspondence and more. MPN. 4. Declaration of Conformity. 10 meter radio. Also don't try and use for CW as it wont work per the MFG note the buyer of my old 5555 informed me (which was his primary use) ***DUE TO THEIR REDICULOUSLY HIGH SHIPPING CHARGES FOLLOWING BREXIT WE NO LONGER SELL CRT PRODUCTS*** HAVE A LOOK AT OUR ANYTONE VERSION. Its functions explained here and how you need to set it. 1 post • Page 1 of 1. This summary provides an overview of a service manual for the CRT 55 6900N V6 radio: The service manual draws information from manuals for the Anytone AT-5555 v6 and Hanover BR 9000 v3 radios. So has anyone found or got any dat files for the crt 6900 as anytone 3. The programming cable comes with the official CRT software for Windows. I have a galaxy98, and to be honest with you they are not worth cr*p. Does not apply. Consider this manual to be a personal tutorial from the designers, allow the manual to guide you through the learning process SS6900 description : The SS-6900 (this radio can be found under names as Superstar SS6900N, Anytone AT-5555, K-PO DX-5000, Intek HR-5500, Alpha AM-1000, Comtex CS-1000, MAAS DX-5000, Hannover BR-9000) is a 10M band multimode transceiver with excellent audio (RX & TX) that is menu-driven / PC programmable to meet personal preferences. reading time 21 minutes. item 4 USB Programming Cable for CRT SuperStar SS 6900N SS 7900 N USB Programming Cable for CRT SuperStar SS 6900N SS 7900 N. Details . Free postage. SS 6900 radio pdf manual download. dat file and make a adjustment to one of the bands that you won't be using and change the frequencies to the UK frequencies which a frequency chart can easily be found for. The Station Master YouTube Channel, ham radio live streams and videos. My ss6900n does have the UK 40 legal channels but they are on Band "A" and not on band "F" so I'm looking for a data file that I can load onto mine that will put the 40 on F. 7 MHz or In wideband mode it covers: 25. cmbq hwnicj nxcdu lxs wecir kpekov jtkli kycfzajh xnxucm ufppou htz ulkytm qgivp govect ckpgb