“The Tube QRP that did not work.”

2008/08/10                                   日本語は下の方にあります。

 

“The Tube QRP that did not work.”

 

I built my first tube QRP transmitter, 2W 20m monobander 6BA6, 6AQ5, Xtal controlled in 2005.  The picture of this transmitter is shown in the album of this blog under January, 2006.  The transmitter I built worked well ( I have made one DX contact with a French station with 2 watts.) so I wanted to build another one for the 15m band hoping that I enjoy exciting QSOs when the condx improved.  So I built one more using the same schematic diagram shown in the Japanese CQ magazine, January 2004 issue.

 

IT DID NOT WORK WELL this time.  I was very disappointed.  I think I had some problems as follows:

(1)   I had poor workmanship for assembling the transmitter, mainly wiring and layout.  The wiring was too tangled and parts were too close, creating some interference.  The 21 Mhz frequency transmitter needs a bit better skill to put together.

(2)   I homebrewed a couple of coils and I checked them with a dip meter and a frequency counter for the resonant frequency.  But when they were soldered on the chassis, it did not perform due to the interference with other parts. 

 

So now what I do:

(a)   I will disassemble the whole thing and will make something else.  Perhaps another 15m tube QRP I will build with my experience I got on this project so next time I will build one that will work.

(b)   As the parts for tube rigs are getting hard to come by, I will try not waste those valuable parts and will enjoy my next project.

 

This project was not successful and I have a couple more projects that were not working and not successful, Hi.  But I learn more this way so I will not run into problems in the future.  I do not fear to make mistakes as long as I learn a lot. 

 

The pictures of the 15m QRP are shown under “ the 15m tube QRP” in the album of my blog under August 10, 2008.     Cheers and 73.

 

Hiro  VE3CGC             ve3cgc@hotmail.com

 

In Japanese

「15m バンド 真空管 QRP、 失敗作」

 

20041月号のCQ誌に「よみがえる熱球21Mhz CW 1w真空管送信機」をJA1AMH 高田継雄OMが発表されました。 幸運にも、カナダで真空管や電源のトランスなど部品が手に入り、K9FHJ ペリーの助けを得て、20m CW 2ワットの送信機を始めて組み立て、フランスの局とDX QRPコンタクトも出来、大変勉強になり、気分うきうきでした。 このブログの20061月にこの送信機の写真がありますので、見てください。 そして、15mバンドのCONDXがよくなったら、2ワットでも、もっとDXが出来ると思って、同じ配線図を使って15mのQRPを作りました。 

 

ところが、このリグはうまく作動せず、失敗作となり、大変がっかりしましたが、得るところは多く、いい勉強になりました。 

(1)   まず、21Mhzとなると配線や部品類の配置も考えないとうまく動作しない。 7MHz3.5MHzの送信機とは違う、作り方も、もっといろいろな事を考えなければいけない。RF関係の配線は短く、部品の配置も十分考慮する。 

(2)   コイルは自作しましたが、前回の経験で、少し自信を持ってつくりました。 ディップメーター、周波数カウンターを使い、出来たコイルの同調周波数を確認しました。 シャーシーに半田ずけすると、これがうまく動かず、発振しませんでした。 部品や取り付け方が悪く、干渉して、うまく作動しなかったものと思います。

(3)   結局、もう一度部品を取り外し、何か、真空管で別な物を作ることにしました。

(4)   できれば、15mCW QRPに再度挑戦してみたいです。 この経験を生かしたいと思います。 でも、どんな物を作るかまだ考えていません。HI.

 

この失敗作の15m送信機の写真はこのブログの「15m tube QRP」として2008810日にありますので、見てください。  質問は受けますよ。

73.

 

ひろ はやし VE3CGC

ve3cgc@hotmail

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