Re: V2 Design #nanovna-v2
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Hi Herb and others
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As soon my SAA-2 arrives (I ordered it on the very first day it was offered by Tindie, and it has left sender country on the way to me) I will issue relevant data for the SDR-Kits of female Rosenberger parts. I have measurements to 8GHz for these part derived from a 4 port brand new R&S VNA. These data are stable for short open and thru adaptor and for the load there is minor differences for the shunt C. The R values for the load are measured individually by SDR- Kit with a 4 wire measuring test equipment against a 0.01% 50 ohm resistor. I will also issue a general document how to fine tune this shunt C by a sweep of a rigid cable based on a reference s1p Touchstone file generated by SimSmith and same open rigid line used to test a sweep round the Smitchart, to see if the average shunt C in the files provided already is OK. I might also provide data for a male kit, time will show I expect this to be successful ? Kind regards Kurt -----Oprindelig meddelelse----- Fra: [email protected] <[email protected]> P? vegne af hwalker Sendt: 22. marts 2020 17:49 Til: [email protected] Emne: Re: [nanovna-users] V2 Design #NanoVNA-V2 On Sun, Mar 22, 2020 at 07:42 AM, David Feldman wrote:
... Battery (size per the hcxqsgroup page) and pigtail cable (type per the hcxqsgroup page) were ordered separately from domestic suppliers .. ============================================== Dave, More important than battery and the cables are the OSL standards. A VNA without accurate standards is like a computer without software -- pretty to look at but limited in use. Since you purchased the S-A-A-2, I assume you intend on using it to 3 GHz. In that case, you should look into the purchase of a quality OSL kit rated to 3 GHz or better. Coaxial adapters rated to 3 GHz are more expensive than those used for the NanoVNA. If you already have a NanoVNA you can use its standards and adapters, but don't expect great performance much past 1.5 GHz. I haven't found a user review of the S-A-A-2 yet, so I can't say if it is delivered fully calibrated (50k - 3 GHz, 201 pts). If it is delivered not calibrated, or calibrated at less than its full range, then that makes the availability of an OSL kit even more important. Looking forward to you receiving your V2 and providing a review to the group. - Herb |
Kurt Poulsen