Yes, I have come across issues to be aware of with the bandwidth. With the spectrum analyser I have, I have seen a video warning of input overload because of the total level rather than just that of one point in the spectrum. Apparently it's something to be aware of when buying a secondhand analyser as faulty input circuitry is not uncommon.
I did wonder about a resistor noise source. I did think too, although only briefly, about a valve based noise source too. I do have a 'noise diode' although still intend it for it's original purpose when I get around to it. Using one as a noise source would not likely be as good as it may seem as I would need to under run it to get good life. It did get me thinking about other diodes though. I wonder about a rod pentode in triode mode with g1 used as a level control? Still I am digressing a bit.
For interest, I have found references to a company who do give a bit of information, much of what you give, in their articles and videos. Apparently their diodes are very expensive though, even if you could get them in small quantities: https://noisecom.com/products
Yesterday I did get the noise diode I have, which is a purpose produced zener, onto a board with it's bias circuitry. I also produced another with RF amplifier. Both manhattan style so should be good in the frequency ranges I am likely to use. I hope to get round to some testing later in the week
I am still wondering about filtering though; at this point whether to approach this seperately as my needs will likely be varying but fairly narrow bandwidth specific.
I did wonder about a resistor noise source. I did think too, although only briefly, about a valve based noise source too. I do have a 'noise diode' although still intend it for it's original purpose when I get around to it. Using one as a noise source would not likely be as good as it may seem as I would need to under run it to get good life. It did get me thinking about other diodes though. I wonder about a rod pentode in triode mode with g1 used as a level control? Still I am digressing a bit.
For interest, I have found references to a company who do give a bit of information, much of what you give, in their articles and videos. Apparently their diodes are very expensive though, even if you could get them in small quantities: https://noisecom.com/products
Yesterday I did get the noise diode I have, which is a purpose produced zener, onto a board with it's bias circuitry. I also produced another with RF amplifier. Both manhattan style so should be good in the frequency ranges I am likely to use. I hope to get round to some testing later in the week
I am still wondering about filtering though; at this point whether to approach this seperately as my needs will likely be varying but fairly narrow bandwidth specific.
