kandi3kan3Nov 19
Pretzel (has moved servers!)
a solution to all your rf woes
Nov 18 at 5:43pmWeb
Show threadWolf480plNov 18
@pretzel
is that like 5 kiloWatts?
Show threadPretzel (has moved servers!)Nov 18
@wolf480pl
5012 Watts or approximately 5 household microwave ovens operating simultaneously
Show threadWolf480plNov 18
@pretzel
or less than one tile of a modern AESA radar
Show threadF4GRX SébastienNov 18
@pretzel NASA DSN is pushing 100kW at the butt of their 34m dishes
Show threadPretzel (has moved servers!)Nov 19
@f4grx Hah, the klystron in the background of the meme is actually a spare 400kW amplifier from one of the DSN dishes at Canberra.
Show threadF4GRX SébastienNov 19
@pretzel thats the wikipedia klystron yeah, I recognize the pic. 400kW total, I forgot about that. not very efficient beasts.
Show threadPretzel (has moved servers!)Nov 19
@f4grx "I recognize that klystron" things you only ever hear on fedi
Show threadftgNov 21

@pretzel @f4grx
But would you have the datasheet for this klystron?
I know it's for X-band and it's in a WR-90 waveguide mount. But that's all I really know.
It's made in France in the 2000's I think?
Due to the Thomson-CSF branding.

It would be very nice if somebody did recognize this klystron.

Show threadF4GRX SébastienNov 22
@ftg @pretzel if it has only one RF port it's a reflex klystron, which is an oscillator. I have the kind of tube thats sits inside the cavity.
Show threadNixieNov 22

@f4grx @ftg @pretzel "I have the kind of tube that sits inside the cavity"

I'll leave that particular remark there. Won't say or add anything in particular to it.

Nothing to see, move along.

Show threadF4GRX SébastienNov 22

@Nixie @ftg @pretzel feeling horny tonight? Lol

Ok granted, klystrons are rf pr0n.

Show threadNixieNov 22
@f4grx @ftg @pretzel Kinda yeah, but for different pr0n reasons:
Show threadPaulNov 25
@Nixie @f4grx @ftg @pretzel Sexy klystrons in your area, desperate for tuned cavities.
Show threadftgNov 22
@f4grx @pretzel
Yeah that tube most likely is the receive local oscillator in some older airborne X-band radar.
And I just want to make it output some RF.
I also do have one old 1.8Gc to 4.4Gc HP signal generator that uses klystron as the oscillator tube.
Due to age the klystron in it is getting lazy and it no longer oscillates much above 4GHz.
Show threadF4GRX SébastienNov 22
@ftg @pretzel these references are hard to find, there are catalogs, but also many customized models with no datasheet.
Show threadNovaNov 19
@pretzel i litterally flinched at the sight of 67
Show threadLuna LacteaNov 19

@pretzel

STOP using anti radio language!!!

Instead of saying:

Link acquired! I'll decrease power until it's at the minimum required to be stable.

Try saying:

Fry the herd of cows that just passed in front of the antenna! We'll have microwaved steak tonight!

Show threadbesseljNov 19

@jackemled @pretzel
Fun fact about the invention of radar

Radar was a practical by-product of Britain’s initial attempt to develop a
directed energy weapon for air defense. As early as 1934, the British Air Ministry offered 1000 pounds to anybody who would demonstrate the apparatus necessary to kill a sheep at a range of 100 yards
https://www.slac.stanford.edu/pubs/slacpubs/7500/slac-pub-7731.pdf

Show threadThomas Guyot-SionnestNov 20
@jackemled @pretzel You know your WiFi router is well tuned once it keeps you warm in the winter! 🤣
Show threadRue MohrNov 19
@pretzel { Rue timidly plugs in his earphone }
Show threadHendiNov 19
@pretzel I saw a big klystron only once at a vhf channel 2 site (Göttelborn) pre dvb, I think at all other broadcast sites and the ring I visited there have been different beasts. But dBm, many dBm beautiful dBm!
Show threadbesseljNov 19
@pretzel depends on the application, but 'wideband' is not the first thing that comes to mind with klystrons
Show threadPretzel (has moved servers!)Nov 19
@besselj I couldn't find any brutally industrial looking TWTAs for the background image :/
Show threadAlexander KnochelNov 19
@pretzel I have 34 dBm, so I'm halfway there!
Show threadAMSNov 20
@pretzel 67dBm.... why do I feel all warm inside all the sudden?
Show threads0 Is Not A SysadminNov 20
@pretzel my friend commissioned one of those for a research facility and I sent it so fast
Show threadAndrewNov 21
@pretzel maybe then my bluetooth headphones will stay connected
Show threadWilliNov 21
@pretzel does it come with "free Wi-Fi" stickers? :)
Show threadCaroline Bell Nov 21
@pretzel deciBels/meter?
Show threadskategoat 🐐 🇵🇸Nov 21
@halotroop2288 @pretzel dB to 1 milliwatt reference
Show threadCaroline Bell Nov 21

@felipe @pretzel

deciBels/milliWatt

dBmW