This instrument has potential if it can be improved to be more stable. I am mainly using it for testing GSM/3g/LTE antennas and circuits and doing devlopment work in striplines on PCB's. Its one of the best analyzers/VNA around for its broad frequency range. The Tiny is much better than the extender. I have owned all their products from the original MiniVNA. I like instrument very much I hope that MRS can improve this great product. I dont know if its the internal clock that drifts or is of poor quality on my unit. I dont understand why the unit was not built into a shielded enclosure. It seems susceptible to noise capacitance and environmental coupling. You can verify this by adding or removing the cable while doing scans on the test load. If you do it seems to affect the readings in reflection mode. I always let the VNWA and the Tiny warm up for a half an hour.Īnother problem with the Tiny is that you cant leave a piece of coax on the Detector port. In contrast my VNWA can be calibrated and the readings on all the loads are perfect from one measurement to the other. Its great if you have to tune a antenna or something else, but you can never be sure that what it is reading is correct because of the drift or whatever the problem it has. While I can understand that the Tiny is not a professional VNA. Its so bad you can leave the unit sitting there, do a scan, store the scan come back 5 minutes later and the readings will be totally different from the ones that you saved. This is very frustrating when you trying to measure or tune a circuit. I even used short rigid microwave line which is perfect line rated for 26ghz and the unit drifts from 1 minute to another. The Tiny readings drift all over the place and has no repeatability.
You shut the VNA/J down open it up and load your CAL file and it reads differently on the same calibration file and load. You can do a calibration and the calibration looks perfect and the measurements are fine. The real problem with the Tiny is that its calibration does not hold and cant make repeatable measurements. I also have some other decent Cal Loads such as Rosenberger and Suhner. I have access to some excellent VNA Cal Kit loads from Agilent. The real problem is the stability of the unit. This is a good product, that work wells when it works.
0 kommentar(er)
