The MIZUHO QP-7

2008/07/17                                     日本語は下の方にあります。

 

“The MIZUHO QP-7”

 

The Mizuho QP-7 is a QRP transmitter kit which was sold in Japan.   I bought it in Tokyo about 6 or 7 years ago.  The Mizuho QP-7 was popular among the Japanese QRP enthusiasts and it was manufactured and sold by the MIZUHO Communication Company in Tokyo.  It was my first transmitter kit I bought but I did not have enough courage to go ahead and build it.  The kit was left on my radio shelf for a while (a couple of years for sure).

 

The specification:  Xtal controlled, CW 1 watt of power.  The oscillation by 2SC945, the buffer by 2SC735 and the RF amplifier by 2SC1957 for 40m band.

 

The QP-7 has a VFO unit to go with it and the VFO was sold separately.   I did not have much idea for Xtal controlled QRP at that time and once I return to Canada, I can not easily purchase the VFO.  So I bought the VFO unit also.   In 2005, I built the QP-7 with the VFO attached so that the transmitting frequency can be changed.  Then the whole thing became difficult and complicated.  When I put everything in an enclosure, the transmitter and VFO did not work.  In the spring of 2008, I removed the PC board of QP-7 from the enclosure and worked ONLY on the QP-7 so that it generates and transmits 1 watt of power.  Luckily I did not have much problem this time and I managed successfully adjusting the RF transformers and the RF filter coils on the QP-7 for generating 1 watt of power.

 

The testing QSOs were made as follows:

KA3SJK, Nick of Phila. PA. with 569 on March 7, 2008.

W9XS/M, Ron of near Chicago, IL. with 449 on March 7, 2008.

 

This was as far as I could go and the QP-7 and the VFO unit are not put together as one transmitter to this date.  It will be my future project to finish it as one unit.  By the way the QP-7 kit is no longer available and not sold any longer unfortunately.

 

The pictures of this unit can be seen on the album of this blog in July 17, 2008.  I would not say this was a failed project but certainly it is not completed.  I need another one or two years more to finish it, HI HI.         

 73.

 

Hiro Hayashi    ve3cgc@hotmail.com

 

 

In Japanese:

「ミズホ QP-7

 

大分前(67年位前HI HI)、東京に出かけた時、秋葉原で組み立てキット「ミズホ QP-7」を買いました。 このキットは私が始めて組み立てるのに手にいれたものです。 カナダの家に持ち帰ってから、しばらくの間(23年間くらい)手をつけずに、棚においてありました。

 

QP-7はトランジスター 3石、パワーは1ワットの簡単なクリスタル発振の40mCW送信機で、QRPの好きな方には興味がわくでしょう。 残念ながら、このキットは現在は売られていません。 私はそれまでは、送信機を組んだ経験が無く、キットの内容を十分理解できていませんでした。 クリスタル発振のため送信周波数はキットについてきた7.022MHzクリスタルだけで、周波数を換えるのに専用のVFO機が別売りされて、これも1台買ってきました。 今から考えると、組み立て経験の無い私には送信機とVFO1台にまとめるのは、少し荷が重すぎ、プロジェクト自体が複雑になり、組み上げてみると動作しませんでした。 そのまま数年、手をつけずにおりました。

 

そして、本年初め、送信機部だけ、とにかく送信できるように、RFトランス、フィルターコイルの調整をし、1ワットのパワーを出せるようにし、テストを兼ねて200837日、QSOしました。

 

KA3SJK,  ペンシルベニア州フィラデルフィアのニック、 RST 569.

W9XS/M,  イリノイ州 シカゴ近郊のロン、 RST 449.

 

VFOと送信機自体を1台にまとめるのは、まだ出来ていません、動作していませんが、あと2年くらいかけて、私の冬のプロジェクトとして、将来完成させようと思っています。 QP-7の写真はこのブログの2008717日のアルバムにあるので、見てください。

 

73.

VE3CGC  ひろ はやし  ve3cgc@hotmail.com 

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