The Michigan Mighty Mite 20m version

March 4, 2007

 

The Michigan Mighty Mite 20m version

 

I obtained the great experience, knowledge and fun on the first Michigan Mighty Mite (MMM) when I built it.   I up-loaded my first MMM on my blog.    

 

I wanted to modify the MMM for 20m and 15m band and I received an e-mail from WA5DJJ Dave a couple of month ago.   I searched more information for the modification and made my second MMM for 20m band with the parts on hand.   It generated the power of 80mW and it was a kind of disappointed result in terms of the power, HI.  I was trying to get the power of about 300mw to 400mw on 20m band. 

 

I came across to read an article of QRPp by JA1AA, Mr. Shohno in Japan, that he has accomplished the WAC with 5mW, yes that is 5 mW.  I believe that for me 80mW of power on this MMM for 20m band will be enough to enjoy QSOs when the condx became right, perhaps a year later.  I wanted to work on my MMM for 20m band to get more power but I decided not to do anything leaving the 80mw of power as is and see what will happen with the MMM I built.

 

I completed the MMM in mid February and to date no QSO has been made.  I simply keep trying to get my first QRPp QSO.  I am sure that I will make the first QSO with my second MMM because my first MMM has made QSO with 100mW last year.  It will be just matter of time and luck and also the condx.

 

The websites for the MMM :

 

http://www.zianet.com/dhassall/Michmitymite.html

http://cs.okanagan.bc.ca/ve7ouc/eng/kc6wdk-mirror/transmitter.html

 

VE3CGC  Hiro     ve3cgc@hotmail.com

 

 

In Japanese:

2台目のQRPp ミシガン マイティー マイト(MMM) 20m バンドを作りました。 始めのMMMを作った時は皆目わからず、電波が出せるまで、時間がとてもかかりましたが(実は1年くらいかかりましたHI)、このトランジスター1石のQRPpはパワーもそこそこで、CWの音も良く、味のある送信機で、2台目を20mバンドで作ろうと思っていました。 改造のインフォメーションが手に入ったので、手元にある部品で2月の中旬に組み上げました。

 

始めは300mWか400mWくらい出せるかなあと期待して組みましたが、電気を通して、送信すると、1台目のMMMが100mW出ましたが、2台目は80mWで期待に反し、がっかりしました。 でも、JA1AA庄野氏は5mWWACを成し遂げたそうで、コンディションが上がり、チャンスがあれば、この80mWでも十分遊べると確信しましたので、これ以上手をいれずに、使う事としました。

 

今日現在、QSOは出来ていませんが、いずれ、1000kmくらい離れた局と80mWQSOできると思っています。 配線図は下記のサイトを参照し、以下は日本で作る時の参考にして下さい。

 

コイル:自作のコイルは35mmフィルムの空きケースにAWG26の銅線を使い密巻きします。 トランジスターに接続する1次側は全部で10巻き、タップは下より数え4巻きで取り、2次側は1次側のコイルの上に巻きつけ、4巻き、同じ巻き方向にします。 2次側はアンテナにつなぎます。

トランジスター:汎用NPNトランジスター2N2222Aまたは同等品(2N44012N3904、日本規格では2SC1815が適していると聞いています)。

変更した部品:始めの1台目のMMMの抵抗27オームを15オームに、10Kオームを18Kオームにこの20mバンドのMMMでは変えました。

バリコン:可変で5pFから60pFあれば十分で、私の場合は、約30pFくらいで同調します。 高い電圧容量は要りませんから、ポリフィルムタイプのバリコンでも十分かもしれませんので、試してください。

 

MMMの参考になるサイトは:

http://www.zianet.com/dhassall/Michmitymite.html

http://cs.okanagan.bc.ca/ve7ouc/eng/kc6wdk-mirror/transmitter.html

 

クリスタル発信ですが、部品数が少なく、手持ちの部品を集めてQRPp送信機を作れ、遊んでみてください。 このMMMは上のサイトを参照すると、160m80m40m30m20mバンドの送信機が出来上がります。 

 

ひろ はやし  ve3cgc@hotmail.com

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5 Responses to The Michigan Mighty Mite 20m version

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