【ゲルトラで作る送信機】 (abstract) An experiment in making a transmitter using Soviet-era germanium transistors. There are no germanium transistors in the Western world that can outout a lot of power in RF. The Western world, including Japan and the U.S., gave up on germanium transistors too early. The Soviet Union had them. I'm going to make a practical CW transmitter with germanium transistors of Soviet

  Photo : 2021.06.01 14:04 JST at Sogenji Temple Ota-City

【トランジスタ・カーブトレーサ：調査編】 abstract I'm going to make a simple curved tracer. A curve tracer is a measurement device to easily investigate the characteristics of semiconductors such as transistors or FETs. It is difficult to make a full-scale curve tracer. However, if the functions are limited and the performance is limited to the required range, it is not too difficult to make it. I will briefly

Photo : 2021.05.02 09:30 JST at my garden

【HAM Bandが拡張されました】 The Japanese Amateur Radio Band (HAM Band) has been expanded.　Expanded are the 160 meter band and the 80 meter band.　In the past, when communicating with DX stations, it was necessary to be on-air at a "split frequency". From now on, JA stations will be able to air at 1800 to 1875kHz, and the 1840kHz FT8 mode will be very popular with JA stations.   (2020.04.21 

【MC3340Pを使ったAM Radioの試作】   I built a prototype AM radio using Motorola's IC: MC3340P in the AGC circuit. The purpose of this is to test if the MC3340P electronic attenuator can be used for radio and wireless communication devices. The MC3340P is a low-frequency device. As a result of my trial, I found out that it can be used for high frequency circuits as well.  I think it is possible

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