Electronics > RF, Microwave, Ham Radio

Russian Noise diode/tubes, anyone use these?

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rwgast_lowlevellogicdesin:
Ive been looking in to either making a homebrew tracking gen, or a really nice flat broadband noise source. Each needs to work to 2ghz. So my thinking on a noise source is to reverse breakdown a zener or an RF transistor and then through a few era5 mmics after it. Looking on ebay I found this kind of stuff

http://www.ebay.com/itm/4x-2D3B-USSR-Noise-Diode-Miniature-Tubes-NEW-/201434297863?hash=item2ee66b7607:g:nesAAOSwWnFWAAW4
http://www.ebay.com/itm/2D2S-Russian-noise-diode-tube-NOS-Lot-of-2-/262075471491?hash=item3d04ea5683:g:YSkAAOxyrUVRnKA3

Anyone know much about this stuff? I cant find ny data sheets, projects etc etc. They look cool but im not even sure
 they are what I think they are and if they would make a good noise source.

T3sl4co1l:
The noise level is quite low, essentially shot noise at anode current.

They're suitable for testing receiver NF but not so much a stochastic TG, not without a lot of amplification (and adjusting for flatness).

Here's a typical European example:
http://www.mif.pg.gda.pl/homepages/frank/sheets/009/k/K81A.pdf

Still, not much data.  You're expected to set Va to a typical value, and adjust Vf/If to obtain the desired noise power as measured by a meter.

Tim

rwgast_lowlevellogicdesin:
Thank you ill definately check out noisecom for sure!

As far as the second option I have read up on a lot of that stuff and in the end I will most likely go down that path, unless something easier and more esoteric pops up either from noisecom, russian tubes (that have some documentation..), or anything else I may find. I made a few active VLF/HF antennas and still have a few of these metal 2n5109 transistors left they are 1 watt with a 1.2ghz Ft, I figured I would experiment using them as the reverse bias noise source, but to tell you the truth I really do not understand reverse break down and its relation to white noise so im not sure if using one over a 2n3906 is just a 4 dollar waste.

Lastly if anyone knows anything about these russian tubes please chime in, there so cheap I would just pull the trigger but in reality with no data on them im 90% sure they will just end up in my RF junk box and never get used when I could have spent the money on some low loss semi rigid coax or a GPS module that will definately get used.

uncle_bob:
Hi

If you just wire up the tubes or the Noisecom diodes, they will be flat into the 30 to 100 MHz range. You need to get fairly tricky to get them anywhere near 2 GHz.

We went over all this in detail in another one of your threads on the same topic I believe ...

Bob

IconicPCB:
http://www.russiantubes.com/prop.php?t=12&p=32

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