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There are many plans on the Internet on building J Pole antennas using copper pipes. I do not exactly have copper welding tools on hand, so, I just build the antenna using metal rods from garden supplies store.

Building a ground plane antenna is pretty straight forward, but building a mount that looks nice does take some time. Here is my take on building a 3D mount for a good VHF Ground Plane Antenna.

Here is my quick notes on how to build a UHF dipole antenna for UHF operation at 433MHz. You do not really need to spend lots of money to buy one, you know?

筆者考了業餘無線電牌的頭一年只用 VHF 及 UHF 頻機種，只能夠跟本地的中繼通聯，覺得頗悶。為了能夠衝出這個小島，就開始想買短波機去跟全世界傾計。

Yaesu 雖然已出了一部新機 FT-991，但因為還沒有貨及不雖要數碼的功能，筆者就買了這一部已生產了 12 年車機了。

以下是最新香港 OFCA 已經登記之 Amateur Radio 通訊器材。買機用以下型號去 OFCA 不用通過新機測試，煩小 D。資訊來源: OFCA 網站。

每逢有空難，FlightRadar24 都可以即時公報遇難航機飛行路線及高度。究竟 FlightRadar24 是怎樣實時追蹤航班的?

今日就同大家介紹 3 套常用 SDR 軟件: gqrx. HDSDR 及 SDRSharp

在 Mac 及 PC 上要行 SDR (Software Defined Radio) 從前是一件行麻煩的事，要做解碼要安裝一大堆軟件。 剛剛在 Github 上看到 Radio Receiver，只要去Chrome AppStore 下載用 Javascript 寫的軟件, 插入支援 RTL-SDR 的 USB 手指可以收聽 FM 電台。