【40mバンドのホイップ・アンテナを作る】 abstract I have built a 40m Band Whip Antenna. This antenna is designed to enjoy HAM by carrying a radio station in a car and moving it around. This antenna has the same structure as the 30 m band antenna introduced in two previous Blogs. Of course, the resonant frequency is different. The construction was easy as I used some parts specially designed for whip antennas. The

【パークス・オンジエア：公園からオンジエア】 abstract Have you heard of POTA?　POTA stands for "Parks on the Air" and is an on-air activity of HAM stations from the parks.　It is a US-derived activity derived from Summit on the Air (SOTA). POTA has already become a worldwide activity.　You can easily get started. The first step is for you to become a 'Hunter'. Then, once you have registered an account on the POTA

【30mバンドのホイップ・アンテナを作る】 abstract The 30m band is a new HAM band in Japan; it has been authorised since 1 April 1982.　Only HAMs with an advanced licence can on-air in the 30 m band.　Therefore, few HAM stations on the air are available, so existing antennas are limited. High performance 30m band antennas for mobile use are unlikely.　If not, it is best to build your own. I build high efficiency 30m

【怪しげな6mのアンテナ】 abstract I got a whip antenna for the 6m band at a junk market.　However, the resonant frequency of this antenna seems to be much lower than the desired frequency.　I first measured the initial value before cutting.　Then I cut about 2 inches and observed the change.　After the fourth fine-tuning, I had a usable antenna. (2024.02.10 de JA9TTT/1 Takahiro Kato)　 【6mはモバイルバンドだった】 　中身がないので昔

【磁石アース板の製作】  abstract The "Magnet Earth ground Plate" is made of a thin rubber plate magnet and a thin metal plate. It has the effect of improving the radiation efficiency of the mobile radio station's on-board antenna. It can be made from inexpensive materials available at $1- stores. (2024.01.26 de JA9TTT/1 Takahiro Kato)　 【クルマの貼り薬？】 　付けたとき最初に思ったのは「クルマのサロンパスみたい」でした。サロンパスはトクホンって言い換えても良いです。

【自動車無線と車載アンテナの話】 abstract Modern vehicles are more aerodynamic in character. It has become more difficult to mount HAM antennas in such vehicles. This Blog explains how to find and mount the antenna where it can be installed. Modern cars can also be used to enjoy amateur radio. (2024.01.11 de JA9TTT/1 Takahiro Kato)　 【アンテナが付くクルマ】 　『今どきのクルマにアンテナなんて付かないよ』アキバのHAMショップで店員に冷たくそう言われてしまいました。 　最近の車に向いた（

2024年も楽しい一年になりますように．

【熊野三山を巡る旅】 　(Link : 熊野三山） Photo : 2022.11.15 12:10 JST : JL215 Photo : 2022.11.15 12:11 JST : JL215 Wing Photo : 2022.11.16 09:31 JST : Kumano Hongu Taisya / 熊野本宮大社 Photo : 2022.11.16 11

【オーディオCWフィルタとパワーアンプ】 【フィルタ付き低周波アンプを作る】 「私だけの受信機設計」の第12回です。今回は低周波アンプ部を製作します。 　ここまでのテストでは低周波アンプにLM380Nと言う低周波パワーアンプ用のICを使ったものを使ってきました。　電圧利得で50倍だけ増幅するシンプルなパワーアンプでした。8Ωのスピーカを負荷にしたときの無歪最大出力は250mW

Photo : 2022.11.07 11:28 JST : Usui Pass; Annaka-City