absolutely the FeelTech FY6600 :
real 2x DAC instead of resistor-ladder, the others use
250MSps 14bit 8Kpts x 8Kpts, the other 12bit? and 2Kpts? find out yourself,
33 preset waves plus 64 user defined waves, total 97
and now: Modulation AM, FM, and a lot Digital: ASK FSK PSK PM !!
because of the VCO Input on the back.
VCO can be used for freq, amplitude, offset, duty cycle
and then it has output as CMOS and TTL (0/180)
just ordered the FY6600-30 for 86€ from Aliexpress
the 30MHz (there are versions up to 60) but this is Sinus only!
Square is always 25M and the rest 10M (ramp, triangle, puls, random)
other brands must be studied, they differ there, e.g. ramp only 2 or 5M
then there is the Feeltech FY2300H <<!! more expensive, but
a nice little alu-box, again varies in MHz Sinus, sqare 25, the rest 20MHz
but no modulation
and I am not shure how a 20MHz Ramp looks like, out of 250MSa ??
so I ordered the FY6600 most of it's modulating capabilities...