Hi everyone,
I'm at that point in my life where I feel the urge to drop some money on better equipment (budget is a flexible 15k). I've been doing RF consulting on the side and have hit that threshold where I really should purchase equipment rated for my 6+GHz (mostly Wi-Fi) work.
For my budget, looking for solid 6GHz equipment has been difficult. It's basically been choose one: a great SA or a nice HP VNA, which is why I thought I would see if anyone had any suggestions! I'd especially like to hear from anyone who does 6GHz development in their personal lab and what your setup looks like/recommendations.
What exactly do you want to do? "RF Consulting" isn't exactly a precise description, and WiFi stuff can cover a lot of different tasks. A bit more information would help here.
As to money, $15k probably won't get you very far for decent 6Ghz lab equipment if its new, so I guess that leaves you with 2nd hand gear. Just to give you some idea what you can get: I currently have three Spectrum Analyzers of which two, a 7Ghz Rohde & Schwarz FSP7 and a 13.2Ghz Anritsu MS8609A, go above 6Ghz (the third one is an Agilent E4406A VSA although it only goes to 4GHz, but then they're dirt cheap). I also have three RF generators (1x Afilent E4433B 4Ghz and 2x Anritsu MG3700A, one 3GHz and one 6GHz unit). All devices have in common that they can often be found for somewhat little money.
I don't have a VNA, which would be nice, but a decent one that covers a wider frequency range goes still for serious money, plus so far I haven't found a situation where I couldn't do without.
In terms of SA, the real bargain was the Anritsu MS8609A, which I got for less than $1500, which isn't bad considering that it's an only four years old lab-grade analyzer in pristine condition. There's also an 8.5GHz variant (MS8608A) which usually goes for slightly less money, and aside from the lower bandwidth is identical to the MS8609A. Both models are essentially Anritsu MS3683A/MS2687A lab-grade spectrum analyzers with a slightly different software stack which were sold as 'Transmitter Testers'.
Besides the high bandwidth, these SAs have a few other advantages, like a RBW that goes up to 20MHz which is really helpful for wideband signals like WiFi (most newer mid-range SAs go to 10MHz, and many older SAs only go to 1MHz). In addition, it's a Vector Signal Analyzer similar to the Agilent E4406A but without the RBW/span limits (there are software options for GSM/HSDPA/HSUPA and WiFi). There's also a digital RBW option which goes down to 10Hz, a narrow RBW option which goes to 1Hz, an option for a lower noise floor and a precision frequency reference option. The UI looks a bit dated but these SAs are very easy to operate, and are quite fast. The RF performance is pretty good, even better than my R&S FSP7 (which already isn't a bad performer). It's all lab-grade kit.
However, specific instrument suggestions aside, as said above it pretty much comes down to what exactly you want to do. You might well be able to live with software tools only, or some other alternatives. Without knowing what exactly your intentions are ("consulting" is a big field) then it's difficult to make useful recommendations.