I got myself a Voltcraft DSO-1062D quite some time ago, when I didn't use to do any RF stuff. It is sold with 60MHz bandwidth and 1Gs/s.
So some time ago I found out that you can "unlock" the software of this scope to have a bandwidth of 200MHz. The tutorial said that the hardware for this would already be in the scope...
On my last post I already stated that I was having some issues with what I measured and @hurz said, that it's rather unlikely that they would just lock the scope in software.
Since I wanted to have one of those for some time already, I got myself a ADF4351 PLL evaluation board. This let's me perform sweeps from 37MHz to 4400MHz.
I connected it to my scope with just a 50 ohm coax which has BNC on one and SMA on the other side. First I tried it with a T-piece and 50 ohm termination since my scope just has 1Mohm input, but that just led to a weird attenuation effect over some frequencies so I just took it out again.
I get a pretty stable 1.4V p-p at everything below 200MHz which is pretty much in spec of the ADF IC.
So I set up a sweep from 40MHz to 400MHz and looked at everything on the FFT monitor. The center axis is at 250MHz and vertical scale is 10dB per division. I took a photo with my phone, but set the shutter time to 1:30 min so it would actually draw me a curve.
I think the result does actually look pretty promising.
http://imgur.com/a/mh2FqcP
But let me know if you see any issues or have doubts.
