25-11-2024, 11:02 AM
A bit of an update. I have been busy with various things and have got some results.
Shown here are the little RF amplifier board using the MAX2611 I mentioned earlier. I actually constructed two of them as it is likely both would be needed. During the initial experiments I have been conducting using my TinySA Ultra I have been testing a number of oscillators I have as regards to purity of signal. Using one of these I tested both amplifiers. They appear to be working as I would expect although a lash up of connections does not help with stray pickup. The circuits shown have temporary connections for testing and are not in their final setup.
I also show the noise generator board. It is supplied via a zener setup regulating it's feed voltage to 30V, rather than perhaps having an indeterminate supply providing input. On test the board appears to output wideband noise but I haven't tested this extensively.
As implied earlier, on looking at signals I have noticed the results obtained by using a lash-up of connections. The indication is that below 1MHz or so things are not too bad but above can be a bit of a nightmare. If there is one thing the TinySA Ultra is telling me, it is just how poor my testing setup is for anything above audio. It's beginning to pay for itself already
Shown here are the little RF amplifier board using the MAX2611 I mentioned earlier. I actually constructed two of them as it is likely both would be needed. During the initial experiments I have been conducting using my TinySA Ultra I have been testing a number of oscillators I have as regards to purity of signal. Using one of these I tested both amplifiers. They appear to be working as I would expect although a lash up of connections does not help with stray pickup. The circuits shown have temporary connections for testing and are not in their final setup.
I also show the noise generator board. It is supplied via a zener setup regulating it's feed voltage to 30V, rather than perhaps having an indeterminate supply providing input. On test the board appears to output wideband noise but I haven't tested this extensively.
As implied earlier, on looking at signals I have noticed the results obtained by using a lash-up of connections. The indication is that below 1MHz or so things are not too bad but above can be a bit of a nightmare. If there is one thing the TinySA Ultra is telling me, it is just how poor my testing setup is for anything above audio. It's beginning to pay for itself already
