推特賣給馬斯克後 Mastodon使用者大增

HA-0218G-NF

Applications:

•  2GHz to 18GHz
•  6061 Aluminum metal alloy
•  Stainless Steel N-female
•  Taiwan Design, Made in Taiwan

Features:

• High Power 300W (peak) 150W (Cont)
•  DC Short lightning protection
•  Low VSWR
•  Uniform Gain
•  Consolidated performance database

The horn antennas of the FT-RF horn double ridged antenna series are characterized by an enormous broad frequency range from 2GHz to 18GHz and very high input powers reach to 300W. The gain increases with increasing frequency up to max 17 dBi. The products are in stock and can be shipped
It is suitable for both transmitting and receiving purposes, especially suitable for microwave and EMC measurements.
This antenna has a more uniform gain and antenna factor because of the better behavior of its radiation pattern.

For EMC/ EMC testing: 

• Pre-compliance testing lowers the chances of certification failure.
  You can make adjustments throughout the design phase with pre-compliance testing.
  Fixing issues after compliance testing are far more costly and time-consuming than fixing them at the design stage.
  Pre-compliance testing might concentrate on the areas where you are concerned about potential issues.
  Instead of looking for faults, pre-compliance testing focuses on identifying solutions.

文／草根影響力新視野(琪拉編譯)

自從伊隆·馬斯克買下推特(Twitter)公司之後，越來越多人轉往Mastodon這個社群平台發展。

你可能沒聽過Mastodon，但這間成立於2016年的公司，目前正以迅速的速度成長。許多人都逃離推特，或是暫時逃離推特，就是想要自由的在網路上發表言論，談論社群媒體公司的解雇潮、充滿爭議的政策變化、言論審核模式等。

Mastodon的服務類似推特，不過他是用時間排序文章，而非用演算法。它也讓使用者加入由不同團體或個人運作的伺服器，而不是限制使用者只能使用由單一公司控制的中央平台，像是推特、IG或是Facebook這樣。

不像其他較大型的社群媒體，Mastodon是免費的，而且也免費刊登拱告。它是由非營利組織所創立，透過大眾集資(crowdfunding)運作。

700MHz to 8GHz Double Ridged Broadband Waveguide Horn Antenna version 2
Model No: HA-07M08GA2-NF

Frequency: 700MHz to 8GHz
Gain: 6 dbi to 17 dBi
LxWxH: 661x430x445mm
N.W.: 8.1kg
-3dB Beamwidth: Horz.26 Deg Vert.34 Deg

Double Ridged Horn Antenna
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The horn antenna is a broadband passive device, shaped like a pyramid horn, referred to as a TEM antenna, which guides the beam of radio waves at a precise frequency. FT-RF Double Ridged Horn antennas have frequency capabilities ranging from 400MHz to 40GHz depending on type and style. These series are characterized by a huge frequency range and extremely high input powers. With increasing frequency, the gain rises to a maximum of 18 dBi. At higher frequencies, the increased gain compensates for the increasing cable losses.

The advantages of Horn antenna:

- Wide bandwidth: Because the horn antenna has no resonant parts, it can function over a wide range of frequencies.

- Easy waveguide interface: These antennas are very easy to interface to waveguide due to their shape, but they can also be designed with a transition so that a regular coaxial feeder can be used.

- Easy to make, simple design.

The horn is suitable for both transmitting and receiving purposes, especially suitable for EMC and immunity test measurements.

Recommended Accessories

- Antenna Tripod: easy and fast-changing polarisation. 100% stable handling

- SMA Cable: High-quality special SMA cable

Mastodon的創辦人Rochko表示，自從馬斯克買下推特之後，Mastodon的使用戶增加23萬人，目前每個月有65多萬人的活躍使用者。而推特目前是2億多位可以帶給公司收入的活躍使用者。

▲（圖／草根影響力新視野）

目前，Mastodon的新使用者包括剛被推特停權的喜劇演員凱西·葛蕾芬(Kathy Griffin)，以及新聞記者Molly Jong-Fast。加州大學洛杉磯分校(UCLA)的助理教授羅波特，她也在馬斯克接管推特之後，開始活躍使用Mastodon，原因是擔心馬斯克對推特的言論監管。另外，她也認為許多使用者投入Mastodon的原因是厭煩自己許多個人資訊被大企業做為商業利用的手段。而且Mastodon使用介面跟推特類似，對原本推特的使用者來說轉換容易，你也可以上傳動態留言、上傳照片，喜歡或追蹤某位使用者等等。

與推特最大的不同，是內容建置的不同。Mastodon的使用者帳號是由不同的網路內容提供者所主導，成本也由不同的團體所分擔，缺點就是你很難追蹤到某位使用者的真實身分。這代表Mastodon並非由單一個人或單一公司所控制。

羅波特表示，她在Mastodon上面的追隨者大增，只短短幾天，就有超過一千多位追隨者。她說：「很多人都不喜歡在推特上面被監管！」

資料來源：https://edition.cnn.com