On Wed, Nov 6, 2024 at 07:37 AM, Ray Lulling wrote:
I thought the H4 had both chips.
No. All of the vna models I am aware of have only one. The MS vs SI chip is really an 'available supply' issue rather than a performance one. The firmware selection is to accommodate whichever one is in your device.
And as the previous poster said, if you primarily want to work at 850MHz-1GHz, you would probably be happier if you pay a bit more and choose the litevna64 or one of the V2 models that are designed for higher frequencies.
Yes, the H4 will 'work' up beyond 1.5GHz - but its performance drops off significantly as you go up in frequency. Its best performance is up to 300MHz, and it still works reasonably well up to 800 or 900MHz (its original spec'd top frequency) - but regardless of which chip it has, all of these higher frequencies have a much decreased dynamic range.
The units units designed and advertised for 4-6GHz have many of the same issues at their highest frequencies, but work much better than the H4 at 800-900MHz and in the low GHz range.
