Photo : 2021.03.04 11:38 JST at "Han no Mori" Patk Fukaya-City

【FT-817のデジタル・インターフェースを試用する】 abstract A friend of mine has developed a digital interface unit for the FT-817.　The unit is mounted on the bottom of the FT-817 and can interface to a PC with a single USB cable, allowing digital mode communication with WSJT-X and JTDX. I am now testing the unit.　I had a little trouble at first. However, the problem has been solved and the unit is now working very

【回路：TBA120Uと言うICをSSB検波に使う】 abstract TBA120U is for PAL-TV  system, but you can use it for FM radio receivers First, I used FM IF-Amplifier to check the IC I got. After that, I tried SSB detector, but the crystal oscillator circuit with the IF amplifier part needs to be examined. After some trial and error, I had good results.  I think the resulting SSB detector has a good performance. (

【測定器：Agilent 53132Aにプリスケーラ追加】 I built a prescaler kit. This kit is for the Agilent Universal Counter Model 53132A.It is distributed by AKC, a group of Japanese amateur kit developers. This kit includes all components as well as a dedicated printed circuit board. It is designed to achieve high performance with fewer parts and is easy to assemble.  The 53132A with the kit was able to

【AD9833をオーバー・クロックで使う】 abstract I will now attempt to overclock the DDS-IC AD9833. According to the datasheet, the upper clock limit of the AD9833 is 25MHz. My guess is that 25MHz is too low. In my tests, the AD9833 worked fine even with a clock of over 100MHz. I will get a clean 30MHz signal from the AD9833 DDS module.Now the $2 DDS module has a new value. (2020.12.30 de JA9TTT/1 Takahiro Kato)

Photo : 2021.02.06 14:46 JST

【回路：中華カウンタとプリアンプ】 I made a kit for a frequency counter. This kit was purchased by mail order from China. It was only $2.9-. The frequency counter was lacking in input sensitivity as it is. So I will build a pre-amp to increase the sensitivity. I put an amplifier on it and it started counting at an input of about 100mV. This is very practical.  (2020.07.05  de JA9TTT/1  Takahiro Kato)

【自作好きHAM用のWindows10 PC】  < Abstract > Support for Windows 7 has ended, so I can still enjoy  "Hand making Rigs" with Win 7 PC.  But I decided to move to Windows 10 because of the need to connect to a network environment safely.   Unfortunately, my old PC couldn't update to Win 10.  So I bought a used, updated laptop. Also, I should install some apps for the HAM who loves "Hand making Rigs".

【ALINCO DM-330MVの修理】 abstract I repaired an Alinco DM-330MV power supply. The failure of that power supply was mainly due to overheating and unstable output voltage.I got the cooling fan from amazon and replaced it. I also corrected the contact failure. The method is very simple. Switch a few times. Let the variable resistor slowly rotate a few times. This is the only way to solve the

 【ebayでお買い物は？】 【ebayって？】 コロナ禍であまり出掛けられません。　まあ、大して気にしなければ良いんでしょうが、気持ちは若いつもりでも若くはありませんからね。　感染は気になります。　それで、通販を楽しむことになるんですが少し幅を広げたいと思います。 　最近の電子工作は、国内の通販だけでなく中華通販を含めて部品調達の範囲は幅広くなっています。今まで見つけられなかったようなアイテムが簡単に手に入ったり、思いがけずお買い得なことも珍しくありません。　ご存知の通り、信用に関しては国内通販に比べてイマイチな部分もあります。しかし、それなりの注意を払えばなんとかなるものです。 　　　　　　　　　　　　　　　　　　　☆ 　最近になってebay（イーベイ）を本格的に使い始めたので様子を書いてみたいと思います。すでに利用中の人も多いとは思いますが、もしまだでしたら如何でしょうか