[Moon] 24GHz EME disaster!

Dominique DEHAYS f6dro at wanadoo.fr
Sun Feb 7 15:46:09 CET 2021


Hi John ,

 

I am interested in nthe replies U may get. I'm in the same case. Building 24G eme and I have a tube wich was delivering 40w peak some years ago and was left u_nused since.

73

Dom

 

 

 

> Message du 07/02/21 14:09
> De : "g4bao via Moon" 
> A : "Moon-Net" , "moon at moonbounce.info" 
> Copie à : 
> Objet : [Moon] 24GHz EME disaster!
> 
> After some 6 months preparing my 24GHz EME system I decided it was time to"bite the bullet" power up and check out the RW1127 TWT. As the tube hadn't been powered up since 2015 but was OK then, I carefully followed the the guidance and just initially applied regulated 6.3V DC to the heaters, no HT voltages. It took around 800mA - all good so I went off and did something else, planning to leave it in that state for 24Hrs and see what happened. On returning to check some 15 minutes later, no heater current! Clearly burnt out! Oh, well...Life's like that sometimes Now looking for another tube if anyone has one! Also interested if anyone can throw a light on the mechanism of failure, as I know sod all about vacuum devices. Would it be a slight failure of vacuum due to the tube's age? Interested to learn from the disaster.. 73 All. 24GHZ EME plans now on hold! John _______________________________________________ Moon mailing list Moon at moonbounce.info /mailman/listinfo/moon Join eQSL.cc https://eqsl.cc/qslcard/Index.cfm


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