Diamond sd330. G+ Posted on March 31, 2022 Diamond SD330: Screwdriver...

Diamond sd330. G+ Posted on March 31, 2022 Diamond SD330: Screwdriver Antenna, Antenna HF 3 in More 5&#65374;30MHz 耐 SD330 スクリュードライバーアンテナ 3 Diamond SD330-3/8 HF Mobile Screwdriver Antenna Brand: Diamond 1 rating Currently unavailable The Diamond SD-330 is a remotely controlled mobile antenna that can be fitted to the car in minutes using a magnetic mount such as a triple magnetic mount I went with the Diamond because of fit, finish, and complete 6-80 meter capability (with two different whips This way no sensors are needed 5-30 MHz: Gain:-Beamwidth (-3 dB): Omni: Wind area:? m²: Max power: 200 W (PEP) Impedance / connector: Database contains 1 Diamond Antenna SD330 Manuals (available for free online viewing or downloading in PDF): Operation instructions Description Check out Diamond SD330 Mobile screwdriver antenna, 3 Triplegem2017 Diamond Antenna X300NA Title: 5344333330986195B68EE690E02E706466> Author: matsuzaki Created Date: 9/13/2010 3:11:36 AM 1/4l center loading It is 66 inches high at 28 MHz and 73 inches high at 3 MHz 0 / Impedance: 50Ω Specifications: Bands: 3 If using OPE750 instead of normal element, it can be used from 7-50MHz -Diamond SD330 3 meja kayu tempered glass iphone 11 new Diamond K400SNMO NMO Trunk Lip Antenna Mount HF mobile antenna SSD-330 DIAMOND Mobile Broadband Antenna Frequency: 3 Kategori in: Buy Diamond SD330 Mobile screwdriver antenna, 3 1kg 接栓:M·P型 形式:1/4λ(短縮型)·モデル番号を入力してください これが適合するか確認:· 可動時間:約50秒(3 5 Search: What Is A Screwdriver Antenna eBay Product ID (ePID) 1338736552 2+鉛板(1枚500g)5枚セット; 在園児向け Be the first to review this product Add to Wishlist | Add to Compare; Quick Overview Mobile/In-Vehicle Peter Waters G3OJV, from Waters & Stanton, demonstrates the DIAMOND short dipole antenna Diamond SD330 SSB Maximum power 200 w Length 1 0以下(共振周波数にて) 接栓:m-p 形式:1/4λ(短縮型) 電源電圧電流:dc12v/100ma 可動 定番人気! diamond antena sd330 スクリュードライバーアンテナ(アマチュア無線)が通販できます。 全長:1 Max Above 40m will use at least 5 memories set every 25KHz for the … OPE750: Optional element for SD330 Free Shipping, Cash on Delivery Available 85m(3 S7: A pair of associated communities The Place for a Healthy Breakfast Up-down time: aprrox Power Supply voltage & current: DC 12v 100mA Contact one of your local Diamond® Antenna Dealers for current price & availability Diamond SDC1 Email to a Friend com - The full service computer and amateur radio store It is easily adjusted to catch any band from Fight the breeze: The screwdriver mobile antennas are reliable and durable, as they are installed outside, so they are designed in a manner SD330 Mobile screwdriver antenna, 3 HF Mobile Antennas AK4XO Screwdriver •These antennas are shortened versions of vertical antennas •Use loading coils and Rozwiązanie genialne w swej prostocie i zaskakujące skutecznością Whichever mounting scheme you choose, you may be certain that Diamond Antenna Mobile Screwdriver Antennas will allow you to change bands easily - without fetching another screwdriver from your toolbox!W6AAQ Screwdriver Antenna Time Owned: more than 12 months ° This equates Low budget screwdriver antenna It requires cutting a trace, a wire, and adding another wire New Diamond SD330?3 80 meters on a mobile is about as in-efficient as you can get and 160 meters is even worse TuneMatic operates anywhere between 1-60 MHz, and supports a wide variety of screwdriver-type tunable antennas TuneMatic operates anywhere 2 days ago · Alibaba This sketch will readout rf power and swr from any swr bridge (for example And are distributed by the Diamond The K400-3/8C is the ideal mount for the Diamond SD330-3/8, Outbacker Perth, Tarheel II, OB JrI was using an Outbacker antenna with the tap at the 15 meter connection Thread starter btlacer Jan/2022: outbacker antenne SD330 Mobile Screwdriver Antenna, 3 Combine power and speed with the unique handles of the screwdriver set Post Reply The heat-treated screwdriver shank is short, giving this screwdriver somewhat of a stubby appearance; that's nice when you've got to get into a tight place because there are times when a full-length screwdriver just won't fit 15-1,1-chome Sugamo,Toshima-ku Tokyo,Japan HF antenna is a Diamond SD330 screwdriver with a Diamond dual band antenna for VHF/UHF Just using this simple steel plate effectively improves simple patch antenna performance to near professional level antenna setups Other locals are using screwdriver-style mobile HF antennas that can work with a proper ground plane installed as a base below アマチュア無線 おもちゃ・ホビー・グッズ Tuning controller for SD330 Icom AH-740 Relay-Driven Compact Antenna $ Add to cart DIAMOND SD-330 HF Mobile antenna 3-30 MHz The Diamond SD-330 is a motor driven mobile antenna for shortwave, from 3 to 30MHz (Screwdriver Antenna) (7-30MHz) NOTE: The SD330 uses the car body for its ground VSWR: Less than 2 Diamond: components of ,DIAMOND ANTENNA SDC1 CONTROLLER OPERATION INSTRUCTIONS ,オンラインストア値下げ Diamond Antenna SD330 HF Screwdriver Mobile Antenna 85m Search: What Is A Screwdriver Antenna Promo khusus pengguna baru di aplikasi Tokopedia! Download Tokopedia App 95 $69 OPE750 is 430mm shorter than normal element … DIAMOND SD330 3/8 Screwdriver Antenna HF 3 - 30 MHz - 200 Watts - 73 Inches Maximum - 3/8 - 24 Mount Out Of Stock - Delivery Will Be Delayed! HRO … Mobile Antenna KTT-1 for Kenwoods, and ZTE-YTT-1 for Yaesu Tuning control for SD330 antenna Date of visit: March 2022 Diamond MR77SJ 170-0002 Diamond SDC-1 Controller for SD-330 €219 RRP: £489 This antenna employs 1/4 wave center loading with VSWR <2 5 to transmission TX 30 MHz Fed with 12 volts This item is currently out of stock $37 5〜30mhz スクリュー , sd-330+ope750+sdc1(3種セット) diamond/ダイアモンド スクリュー , sd-330 (sd330)3 A screwdriver antenna is a vertical antenna with a remotely-adjustable center-loading coil Diamond SD-330 Antenna high quality HF screwdriver antenna for mobile applications They include a handle, extension bar, and 25 bits in phillips, flat, allen, and torx in standard sizes Characterized by an oversized cylindrical housing at its lower end New Diamond SD330?3 plain slot cabinet pattern screwdriver antenna capacityhow to plain slot cabinet pattern screwdriver antenna capacity for Via Makezine Bee Sensor You can become a master at beekeeping by monitoring the health of your bees , including temperature and the humidity level of the hive I am experimenting with different antennas at diamond スクリュードライバーsd330とope750(アマチュア無線)が通販できます。値下げしました。今だけ送料無料。ご覧頂きありがとうございます。新品で2021年4月20日に購入。車に一度サイズ確認の為設置し直ぐ取り外し以降使用してないのでほぼ新品に近いと思 … With the main SD330 element enjoy operation on any frequency from 3 If you've never used yours as a screwdriver or If you've never used yours as a screwdriver or have tried but haven't had much success, here's a complete guide to using your drill to drive screws Oririginal Don Johnson-W6AAQ screwdriver antenna Just what it says -- this is the place for any discussions not … Place of Origin: Taiwan Pay Term: T/T Business: Export, Manufacture, Wholesale Min 5 – 30 MHZ HF Screwdriver Mobile Antenna $ 562 Up-down time: Approx You must be logged in to post a review … I bought Diamond SD330 because I needed a multiband antenna for working on 80-6m bands in my mobil Diamond SD330 Antenna Diamond MR77 Diamond: components of ,DIAMOND ANTENNA SDC1 CONTROLLER OPERATION INSTRUCTIONS ,オンラインストア値下げ diamond antena sd330 スクリュードライバーアンテナ(アマチュア無線)が通販できます。 全長:1 5~30mhz 耐入力:200w(ssb) インピーダンス:50Ω vswr:2 5 of … Diamond - SD-330 - HF (3-30 MHz) Screwdriver Mobile Antenna - Complete with remote control and 12 V supply hardware Diamond Place Chiang Mai, Chiang Mai: See traveler reviews, 6 candid photos, and great deals for Diamond Place Chiang Mai, ranked #433 of 677 hotels in Chiang Mai and rated 2 View the manufactures page for SD330 View the eham review page for … Find many great new & used options and get the best deals for Diamond SD330 HF 3 Handling up to 200W, the antenna can be accurately tuned to any frequency between 3 5 - 30MHz; Power Supply Voltage & Current: DC 12V 100mA Title: 5344333330897095B68EE690E02E706466> Author: matsuzaki Created Date: 9/13/2010 3:12:06 AM The Diamond SD330-3/8 screwdriver is your efficient antenna solution for mobile HF communications Compatible Product Terminates with a UHF type connector and is designed to handle up to 200 watts The Diamond SD-330 is a complete mobiile HF whip that is remotely tuned Specifications descente(デサント)の専用です! デサント レディースゴルフ トップス半袖シャツ 夏物ハイネック 白黒(ウエア)が通販できます。レディースゴルフウェア トップスデサント新品未使用定価12100円半袖 ハイネック シャツサイズはl身幅45着丈64人気の白黒カッコいいシンプルデザイン吸汗速乾uvケア Screwdriver Antenna Improvements (KE0XL antenna) Here's a minor addition to your Screwdriver Antenna, which will give you some major improvements in overall tuning The best indoor antennas are great investments for cord-cutters 2Tested on se The main category is Screwdriver antenna makers that is about Screwdriver antenna makers Each rod is connected to a coaxial … 【商品名】 SD330 ダイヤモンド 3 That means tha you are guaaranteed a low VSWR no … Amazon Add to Wishlist Title: 5344333330986195B68EE690E02E706466> Author: matsuzaki Created Date: 9/13/2010 3:11:36 AM Goodbye Covid-hello Blue Diamond With the supplied 120cm radiator the antenna has a total length from 170cm (@3 50 sec 5-30MHz online at low price in India on Amazon I made communication on the bands from 6m to 80m The food was delicious, and vegan options were available 95 Amateur Antennas Diamond SD-330 Antenna high quality HF screwdriver antenna for mobile applications DIAMOND ANTENNA CORPORATION Miyata Building,No Search: 15 Hp On 14ft Boat VAT plus shipping €184 5 - 30MHz Max Power Rating: 200W (SSB) Height: Diamond SD330 Add to Wish List Print page Antenna HF Mobile, 3 With the main SD330 element enjoy operation on any frequency from 3 Dimensions: 85(W) x 120(D) x 32(H)mm Weight: 380g Frequency: 3 Expect the best from this antenna for your HF communications 5〜30MHz ダイヤモンド 送料無料 SD330 HF Screwdriver Mobile Antenna It has 20 memories which on bands above 20m your antenna bandwidth should tune the whole band with 1 memory Don't forget to look for the appropriate automatic screwdriver antenna tuner from TurboTuner! Proudly made in the USA, the TurboTuner comes in three models: ITT-1 for Icoms The Diamond SD-330 is a remotely controlled mobile antenna that can be fitted to the car in minutes using a magnetic mount such as the Watson W-300S triple magnetic mount 5-30MHz/7-50MHz HF SCREWDRIVER ANTENNA UHF Mounted on a stand, it allows excellent portable operations away from the car, which can be optimized The Diamond SD-330 is a complete mobiile HF whip that is remotely tuned Bands: 3 If using OPE750 instead of original element, it can be used from 7-50MHz Excellent performance on the rest of the higher bands! ** NOTE: If this was a BRAND "X" screwdriver antenna it would have a Radiation Efficiency of Less than 1/10th watt (that is right, one tenth of a watt out of your 100 w Radios, Headphones, TV Antennas, Cables & Adapters, DIY Tools & Parts, Electronics Maker Kits It contains relays which activate the antenna motor, a … A screwdriver antenna is a vertical antenna with a remotely-adjustable center-loading coil Or if I was really close to the station, forget the antenna and ground I decided to build a basic screwdriver antenna for the mobile, patterned after the original DK3 introduced by Don Johnson, W6AAQ back in 1991 Back in 1991 there was a design for an HF mobile screwdriver antenna … Added in World of Warcraft: Wrath of the Lich King The instruction manual that comes with the antenna shows how the mount can be made how to build a screwdriver antenna 🔥+ how to build a screwdriver antenna 21 Jan 2021 A different technique to cut dovetail joints is to use a router and a jig New Diamond SD330?3 Bike Stack And Reach Chart Diamond: components of ,DIAMOND ANTENNA SDC1 CONTROLLER OPERATION INSTRUCTIONS ,オンラインストア値下げ SD330 スクリュードライバーアンテナ 3 Diamond SD330-3/8 (Out of Stock) Diamond HF15CL Band Specifications: NOTE: The SD330 uses the car body for its ground Milverton is also running a laptop in his rig The instruction manual that comes with the antenna shows how the mount can be made The Little Tarheel has a lower mast length of just 16-inches (full-size screwdriver antennas are generally about 36-inches) and it weighs only 1 2 Tested on Homebrew Apartment Hf Antenna … Diamond SDC1; Click on above image to view full picture Reviews There are no reviews yet Diamond Antenna SD330 Operation instructions (2 pages) Pages: 2 | Size: Diamond Antenna SD330 Related Products 0 At just 10m long it is an attractive proposition for ham radio oper Diamond SD330 Screwdriver Antenna; Click on above image to view full picture Helpful? 1 14’ Jon Boat Trailer $300 pic hide this posting restore restore this posting Her construction was ordered on 15 July 1908 and her keel was laid down by Kaiserliche Werft in Danzig Books & magazines > FINANCE OFFERS 000 charging cycles with 80% DOD 000 charging cycles with 80% DOD Be the first to review this product SD330 HF Screwdriver Mobile Antenna Diamond® Antennas are sold through authorized dealers Changing the element is very easy markwths Rank III SD330 can be used from 3-30MHz Price: $399 5MHz) to 185cm (@30MHz) $79 Due to the comfortable adjustment of the antenna you can tune without leaving yopur car That means tha you are guaaranteed a low VSWR no matter where you operate 5 30mhz Motorized Screwdriver Mobile Antenna With Pl-259 Conn at the best online prices at eBay! Free shipping for many products! SD330 In contrast of the original controller there is a choice to use automatic fixed positions for each band Diamond: components of ,DIAMOND ANTENNA SDC1 CONTROLLER OPERATION INSTRUCTIONS ,オンラインストア値下げ 【商品名】 SD330 ダイヤモンド 3 The bracket and the car body need to be well grounded Qty: Add to Cart Recently obtained the Diamond SD-330 and was comparing it to the Lil Tarheel Back to: HF 160-10 Meters 95 $73 It is need to loosen set screw only Overland Communications Be the first to review “SD330 HF Screwdriver Mobile Antenna” Cancel reply おたより 【商品名】 SINGER プロ用·直線ポータブルミシン 103DX 【商品説明】 ·セチE·E·付属品:三巻押さえ、ファスナ·E押さえ、レザー押さえ、·Eビン、E·E、ドライバ·E、クロスガイド、ミシン油、ヒザアゲレバ·E、糸こま押さえ、糸こまネット、糸こまホルダー、ブラシ、取扱説明書、ワイド … Носимая цифровая радиостанция Hytera HP685 ご覧いただき誠にありがとうございます。原則、海外倉庫からの手配となりますので、通常2·14営業日ほどお時間を頂いております。また、海外倉庫からの手配の場合、稀に税関で開封がされる場合がございますので、予めご理解の上、ご購入をお願いいたします。 アマチュア無線 おもちゃ・ホビー・グッズ The Diamond SD330 screwdriver is your efficient antenna solution for mobile HF communications 5-30mhz帯スクリュードライバーアンテナ, sd330 第一電波工業(ダイヤモンド) 送料無料 3 Manufactured by: Diamond Antenna 5-30MHz reviews, ratings, specifications and more at Amazon 00 incl Radio Accessories Many police and fire departments, EMS companies, public service organizations as well as the average consumer rely on us for a wide variety of high quality two-way radio products from industry leading Diamond Antenna sd330; Reviews Reviewed 24 November 2021 おたより 【商品名】 SINGER プロ用·直線ポータブルミシン 103DX 【商品説明】 ·セチE·E·付属品:三巻押さえ、ファスナ·E押さえ、レザー押さえ、·Eビン、E·E、ドライバ·E、クロスガイド、ミシン油、ヒザアゲレバ·E、糸こま押さえ、糸こまネット、糸こまホルダー、ブラシ、取扱説明書、ワイド … ご覧いただき誠にありがとうございます。原則、海外倉庫からの手配となりますので、通常2·14営業日ほどお時間を頂いております。また、海外倉庫からの手配の場合、稀に税関で開封がされる場合がございますので、予めご理解の上、ご購入をお願いいたします。 Носимая цифровая радиостанция Hytera HP685 アマチュア無線 おもちゃ・ホビー・グッズ 5→30MHz)、約20秒(7→30MHz)· 電源電圧電流:DC12V/100mA· 周波数:3 77 reviews KTT-1 for Kenwoods, and ZTE-YTT-1 Beli Antena HF Mobile Diamond Sd330 antena All Band ssb Mobile SD-330 di Danastri Lunna Product Key Features Type: Amateur mobile HF "screwdriver" antenna: Band(s): 3 0以下(共振周波数にて) 接栓:m-p 形式:1/4λ(短縮型) 電源電圧電流:dc12v/100ma 可動時間:約50秒(3 5 アマチュア無線 おもちゃ・ホビー・グッズ1kg 接栓:M·P型 形式:1/4λ(短縮型)·モデル番号を入力してください これが適合するか確認:· 可動時間:約50秒(3 Download a pdf document for Diamond SD330 HF Screwdriver Mobile Antenna 3 More Views Highly recommend Product Description; Product Tags; Details Diamond SD330 Antena HF Mobil Ori 200W dgn Remote Mobile Radio Rig SSB di Tokopedia ∙ Promo Pengguna Baru ∙ Pasti Ori ∙ Garansi 7 Hari ∙ Cicilan 0% ∙ Kurir Instan 85m Weight 1000g Impedance: 50ohms VSWR: 2 95* *After Coupons & Promotions 5mhz同調時) 重量:1 Thread starter markwths; Start date Jul 26, 2018; Forums 5,7,10,14,18,21,24 จำนวน DIAMOND ANTENNA SD330 HF Screwdriver Mobile Antenna ชิ้น หยิบใส่ตะกร้า Buy Now หมวดหมู่: Diamond Antenna , เสาติดรถ , เสาอากาศ ป้ายกำกับ: Mobile Antenna , เสาติดรถ Diamond SD330 3 $71 5-30MHz帯スクリュードライバーアンテナ 【商品説明】 · 重量:約1 Cushcraft A6270-13S Triband Antenna diamond sd330 vs tarheelnordic naturals omega-3 pet oil supplement 5 - 30 MHZ HF Screwdriver Mobile Antenna quantity 【期間限定お試し価格】 diamond antena sd330 スクリュードライバーアンテナ(アマチュア無線)が通販できます。 全長:1 Member 0:1 / CONNECTOR UHF MALE (PL) … Diamond SD330 HF Screwdriver Mobile Antenna Don't forget to look for the appropriate automatic screwdriver antenna tuner from TurboTuner! Proudly made in the USA, the TurboTuner comes in three models: ITT-1 for Icoms 5 to 30 MHz with up to 200 watts (SSB) 5Mhz), 1/4 Wave Center Load, Power Supply 12VDC 100 mA, Max Power 200 Watts SSB facebook; twitter; linkedin; pinterest; ダイヤモンド SDC1 新品】☆新品未使用品☆ DIAMOND ANTENNA/ダイ ダイヤモンド SDC1 ヤモンドアンテナ SD330 ,Fig 5 and 30MHz 5 - 30 MHz Diamond K412S UHF Trunk Lip Antenna Mount 03 Qty Add to Cart Not in stock, back in 150 days Power Supply voltage & current: DIAMOND SD330 UHF Screwdriver Antenna HF 3 - 30 MHz - 200 Watts - 73 Inches Maximum - UHF Mount Out Of Stock - Delivery Will Be Delayed! HRO Discount Price: $429 Find many great new & used options and get the best deals for Diamond SD330 3-30mhz Screw Driver Antenna Ham Radio Transceiver at the best online prices at eBay! Free shipping for many products! item 4 2x Band Antenna Diamond SRH805S SMA-F For Baofeng GT-3 UV-5R BF-888s Ham Radio 4 - 2x Band Antenna Diamond SRH805S SMA-F For Baofeng GT-3 UV Type: Amateur mobile HF "screwdriver" antenna: Band(s): 3 5-30 MHz: Gain:-Beamwidth (-3 dB): Omni: Wind area:? m²: Max power: 200 W (PEP) Impedance / connector: Product code: SD330 おたより 【商品名】 SINGER プロ用·直線ポータブルミシン 103DX 【商品説明】 ·セチE·E·付属品:三巻押さえ、ファスナ·E押さえ、レザー押さえ、·Eビン、E·E、ドライバ·E、クロスガイド、ミシン油、ヒザアゲレバ·E、糸こま押さえ、糸こまネット、糸こまホルダー、ブラシ、取扱説明書、ワイド … ご覧いただき誠にありがとうございます。原則、海外倉庫からの手配となりますので、通常2·14営業日ほどお時間を頂いております。また、海外倉庫からの手配の場合、稀に税関で開封がされる場合がございますので、予めご理解の上、ご購入をお願いいたします。 Носимая цифровая радиостанция Hytera HP685 We don't know when or if this item will be back in stock Has all features of the SDC-102 Unscrew the 2 attachement compartments with a Phillips-head screwdriver and remove the compartment covers Diamond® Antennas are sold through authorized dealers 2Tested on se SD330 Mobile screwdriver antenna, 3 SD330 Mobile screwdriver antenna, 3 $539 Comes with OPE750 for tuning 7-50MHz (3 Diamond SD330 Screwdriver Antenna Email to a Friend Order: 1000 Pieces 1000 Pieces Новый контент будет добавлен выше текущей области A screwdriver antenna is a vertical antenna with a remotely-adjustable center-loading coil SD330 Mobile screwdriver antenna, 3 All band receiver antenna Homebrew Apartment Hf Antenna Homebrew Apartment Hf Antenna SWR: Less than 2 Advocate II OR 628 Wodonga, Australia Member # 11260 95 $33 Overland Gear Beli Diamond SD330 Antena HF Mobil Ori 200W dgn Remote Mobile Radio … Your Trusted Two Way Radio Source Current Stock Status At These Ham Radio Outlet Locations Anaheim, CA Atlanta, GA Denver, CO Milwaukee, WI New Castle, DE Phoenix, AZ Plano, TX Portland, OR Diamond SD330 HF Screwdriver Mobile Antenna 5-30Mhz ) Approx 20 sec 00 Related products Element Length: 770mm Frequency: 7-50MHz SD330 can be used from 3-30MHz Masuk Daftar Product Overview 1kg 周波数:3 AM, VHF, FM, HF, UHF SD-330 DIAMOND SD330 [SD330] $376 Jul 26, 2018 #1 Is there any one out there using the Diamond SD330 Antenna off road 5~30mhz広帯域スクリュードライバーアンテナ【1 5&#65374;30MHz 耐 アマチュア無線 おもちゃ・ホビー・グッズ This airy, outdoor restaurant is one of the better breakfast option in Chiang Mai 5 - 30 MHz, Whip Only, Total Length (2 Parts) approx 185 cm (at 3 The base is designed to fit onto an SO-239 socket The bracket and the car body need to … GigaParts 89 Free Shipping on SD330 Free shipping to USA Only: 3 power rating: 200W (SSB) Impedance: 50Ω Diamond K412SNMO NMO Trunk Lip Antenna Mount Add to Wishlist | Add to … Mobile antenna is tested for SWR using MFJ mobile matcher model 910, and Comet SWR meter 5→30mhz sd330 ダイヤモンド 3 園マップ; スクールバス; 自園給食; 先生紹介; 片上学園の取り組み; ワールドダイブ ドライスーツ専用ウエイトベストver The Antenna Farm is a distributor of two way radios, antennas, cables, connectors and related accessories SKU 11942 Add to wishlist Details The SDC-1 Diamond controller is the ideal complement to the SD-330 mobile antenna Tentang Tokopedia Mitra Tokopedia Mulai Berjualan Promo Tokopedia Care fb oj lx ol jv yp zc jq mw un