DP-64, the LAST signal you will see in a NUCLEAR WAR

[@excessionary]

To paraphrase the instructions: "If the device detects radiation, switch it off to prevent panic. Keep working. Reactivate the device periodically to check if the radiation has magically disappeared." 😂

[@ChernobylFamily]

Kind of :)

[@juk-hw5lv]

Most likely the signal is just so horribly annoying and also drains the battery. Installing a mute switch was probably too complicated for these sort of doomsday devices

[@ChernobylFamily]

In reality it makes just ticking. Power switch acts as a mute switch, because it looks you can't make it even simplier.

[@juk-hw5lv]

@@ChernobylFamily I believe it's the battery issue, also intermittent operation is lighter on the components and you definitely want to keep your safety device running as long as possible when you're the last man alive on a radioactive wasteland...

[@vinny142]

" to check if the radiation has magically disappeared." More like: see if the radiation is still detected and it wasn't a false alarm.

[@dukenukem8381]

That motorized camera mount looks sturdy enough to mount some machine guns

[@ChernobylFamily]

In fact it is so powerful that it can lift much. Radioamateurs sometimes repurpose them to move large antennae.

[@cdl0]

Fascinating stuff. The rubber ring that secures the power cable is called a grommet; the rotary resistor is called a potentiometer.

[@ChernobylFamily]

The first I did not know, for the second know well but somehow forgot to use...) Thank you for corrections!

[@cdl0]

@@ChernobylFamily Thank you for the video. Grommet is a lovely word. 🙂 I just watched the recovered audio recording from Chernobyl video.

[@ChernobylFamily]

@@cdl0 there will be one more record like this next weeks!

[@cdl0]

@@ChernobylFamily You will need to call the fire brigade again to cut the words on the tape from mangled wreckage of old Soviet Union language! 🙂 That last recording is quite incredible for the word salad. . . .with special USSR dressing.

[@ChernobylFamily]

@@cdl0 )))))

[@ruben_balea]

I was going to say that some neon voltage regulators had a bit Krypton-85 to help them strike at lower voltages so they get unstable with the age as the Kr-85 decays, but it seems that tube was filled with hydrogen and I have no idea if hydrogen has the same peculiarities as neon...

[@ChernobylFamily]

Unfortunately, did not check the exact type of that very tube - and the device already on exhibition at the Museum of Chornobyl in Kyiv.

[@juk-hw5lv]

The earth on the detector probe probably increases the sensitivity a lot and reduces interference, just like earthing parts of a radio transciever rig do

[@ChernobylFamily]

Makes sense!

[@juk-hw5lv]

@@ChernobylFamily as an amateur radio operator I've got some experience with homebrew radio receivers (radio waves and radiation are different parts of the same spectrum anyway) and the truth is that the simpler a scheme is, the more ground you need on everything metal to keep it reasonably usable. Ground the case, ground the antenna, and even then if you do some magic moves with your bare hand over the receiver it will go out of tune anyway.

[@sheep1ewe]

Thank You, this was genuinly interesting as usual!

[@ChernobylFamily]

Glad you enjoyed that!

[@msylvain59]

I missed one of those cameras onto german ebay someday. First time I see this particular model of wall mount radiation alerter, the parts used inside are very common.

[@ChernobylFamily]

Which specifically? There were a few versions of them, we'll have KTP-83 for sale. That one is easier to work with than a pictured one.

[@MarkMcCluney]

Most interesting and satisfying to see it nicely cleaned up. Is the relay still working after all this time? I'm looking forward to seeing the video camera video. Cheers Alex and thanks again.

[@ChernobylFamily]

Thank you! The relay is working, but capacitors are nearly dead. I switched it on, got a few clicks/flashes and switched off, because it does not look really safe to use for now (400V inside is not a joke). A camera video will come - that is an epic device.

[@willwood3648]

probably would be good to see it plugged in

[@ChernobylFamily]

We donated it to Museum of Chornobyl in Kyiv, but there is a chance we will make it a functioning exhibit at some point.

[@nojbik]

Hi Alex, this is another nice piece of history. I don't think that so called relay is only a simple relay, it seem to be a bit more complex, so I'm expecting to see some amplifier inside. I'm thinking that they've decided to make it socketed to be quickly replacable because they've expected to wear out. It is probably the reason why it's not working.

[@ChernobylFamily]

Thank you! Well, according to datasheet it is a relay - "Relays RP-5 RS4.522.008 sheathed, polarized, with one switching element, designed for switching DC electrical circuits.". I believe, a bigger probability have these capacitors - because the voltage regulator tube glows rarely and randomly, while in a self-test mode it should be around every 3 seconds.

[@nojbik]

@@ChernobylFamily Voltage regulator tube? Can You explain it in later video where it will be functional?

[@ChernobylFamily]

For now, I can explain it this way: here it is basically just a neon tube that works like a valve. If capacitors (powered by the integrator of the detector's impulses) get charged to a designated level, the tube ignites and connects the circuit that activates the relay. And the relay does the signalizing stuff.

[@Yaivenov]

How interesting! What sort of detector element is used? I believe I have the American Civil Defense equivalent to that unit, the CDV-717 remote monitoring unit. The V-717 uses an air filled ionization chamber however so it is insensitive to anything less than 0.1 Roentgen/hour and maxes out at around 500 R/h. Calibrating the unit is out of the question for me as the manual calls for a 10Ci Co-60 source. Certainly not something I keep around the house!

[@ChernobylFamily]

i was not sure about it, but many commenters suggested it is a large ionization chamber. Check our previous episodes, we have there also a DP-3B device which is a vehicle-mounted monitor, and a very special RKb4-1eM for measuring of volumetric activity. Well, that one is THE device.... ))

[@Yaivenov]

@@ChernobylFamily your device seems to have the same sensitivity range as mine so I am inclined to agree that it is an air ionization chamber.

[@50shadesofbeige88]

Biorobot... What a dehumanizing term.

[@ChernobylFamily]

Agree. Unfortunately, its use already in 1986 is a historical fact.

[@ivuldivul]

0:45 What's the worst device then? Personal chemical dosimeter DP-70?

[@ChernobylFamily]

DP-70, I, unfortunately had no chance to try.

[@schnizzyfizz7832]

The indicator light and alarm is like Kenshiro. It just informs you that you are already dead.

[@ChernobylFamily]

Hahah

[@AndrewTubbiolo]

Biorobot is my fav slang of the New Soviet Man.

[@ChernobylFamily]

...it was an actual neologism of that times, with a very creepy origin. Says much about these times.

[@am74343]

How are these videos still being made while there's a war going on? I would think Russia would be trying to squelch all the bad publicity they've had about Chernobyl for the past 37 years.

[@ChernobylFamily]

They are being made in a hard way. You maybe noticed we did not have new for a couple of weeks; we are in Kyiv region, there are no actuve battles since April 2022, BUT just for your understanding during this May we got 18 (eighteen) missile and drone attacks (each wave is 20-50 units flying to us), sometimes up to 3 times per day. Anti-missile defense makes wonders using the systems provided by U.S. and EU and down most of that russian 'gifts', but some do hit. And they hit randomly. So what I want to say, although e.g. Kyiv lives at a first glance normal life, there is no really safe place, it is a...lottery, I think you get what I want to say. Why we do this? Because this is our contribution into educating western audience with our history without russian narratives.

[@dukenukem8381]

1:16 i see nothing

[@ChernobylFamily]

That is such a short frame with a piece of graphite. Longer, unfortunately, we do not have.

[@AndrewTubbiolo]

If I had one, I'd attach the detector outside my truck so I could approach beautiful women and tell them they're HOT! Then prove it with the self test mode.

[@ChernobylFamily]

:)))) Reminds me quotes from one of Uranium Rush epoch movies poster...

[@amfiton92]

Было б яшчэ добра, каб было відэа па ДП-5В

[@ChernobylFamily]

Калі будзе магчымасць, мы зробім такое відэа.

[@zsuzsu2657]

Все добре, але чому нема Українського контенту?

[@ChernobylFamily]

Тому що цільова аудиторія англомовна. Не думаємо, що нашим людям ми розкажемо щось принципово нове. Втім, деякі відео вже мають субтитри - більше, поки що, фізично не виходить...

[@vegapiratradiovpr425]

5:13 - that's not neon tube, that's voltage regulator tube.

[@ChernobylFamily]

Thanks. In one of modifications of DP-64 there is a neon tube TN-0,2 with the same function.

[@vegapiratradiovpr425]

@@ChernobylFamily wierd enought. usualy used сг301с

[@Totumfacky]

What means the red band on your wrist?

[@ChernobylFamily]

A local belief, let's say, a protection thing given by my wife