How IOTs Work

Shows how an IOT used in Broadcast Television operates.
Learn more about Broadcast Engineering at TheOnLineEngineer.org -

[@wa9kzy326]

I have learned a few decades ago that the only reliable source of transmission line and antenna information if from broadcast engineers (and Walt Maxwell). :-) I am so glad that a man of your background and experience is producing these high quality videos. Thanks a million, Russ !!!!!!! 73

[@PicaDelphon]

Nice to get a Update on how thing like the IOT's Work in Transmitters..

[@nakayle]

Excellent video. Many years ago I help maintain a RCA TTU-30 which used klystrons. We called them tea-kettles because most of their input power was spend boiling water for the heat exchanger. RF was a minor byproduct- about 20% efficiency on a good day. Little wonder so many Us went bankrupt in those days. I'm retired now but good to know that UHF transmitter technology has improved since then.

[@shockingguy]

Love these kind of instructional/explanatory videos. Thanks

[@tomselbeck]

Great video! I have nothing to do with RF, but this kind of stuff is very intresting and understandable!

[@romualdolintag9330]

Hi Russ, from 0:54 to 1:07, the dual cabinet IOT shown is a Larcan Landmark used by KRON 4 in San Francisco. It is still on air until the Repack retires it by 2020 as planned. Just thought you may be interested to know.

[@douro20]

The first television broadcast in North America was made using an IOT. That was quite a bold move on the part of RCA because early IOTs were much more prone to internal arcing.

[@FunkyDrumm3r]

really well done video, thanks!

[@michaeldomansky8497]

Love it! Takes me back to my old RF days ...

[@jeffmills4103]

Very informative and well done. Thank you.

[@KeoniFilmTV]

Awesome!

[@JamesGMunn]

Why is the plate so deep? Is it to avoid secondary electron emissions from interacting with the modulated drift electrons at the primary output cavity?

[@tripplefives1402]

More surface area for liquid cooling.

[@SuperBorg1]

Is there an FM broadcast IOT? Maybe it is larger for a lower frequency. Or just use triodes.

[@nakayle]

At FM frequencies conventional tubes are cheaper and easier to use.

[@SuperBorg1]

And also the FM ERP is limited to 100,000 watts (50K transmitter into 4 bays) so a 500,000 watt output IOT is overkill.

[@romualdolintag9330]

IOT's are primarily used for UHF band. Since FM is on VHF, an IOT is not suitable.

[@tripplefives1402]

​@@SuperBorg1someone has probably made a CB linear from one.

[@drlegendre]

Why does that plane keep bombing your transmitter?

[@charadremur333]

I was tempted to comment something like that.

[@godfreypoon5148]

I thought the IOT was mounted that way so the electrons fell down faster. hurdy durrrrrrrrrr

[@uTube486]

I think Idle is not spelled "Idel". Nice video though.

[@EdWatts]

"Eimac", not "Enmac"!