[vna] Version 1.6 of VNA software uploaded

[tom.mcdermott4 at sbcglobal.net]

Version 1.6 of the VNA software, and accompanying Issue 4 of the Instruction
manual have been uploaded to the TAPR VNA Software site. You can access the
site via the VNA software using the Help->About->Launch Browser meanu. BE
SURE TO REFRESH YOUR BROWSER WINDOW since the older version of the menu may
be cached somewhere along the line...

It can also be reached directly via:

	ftp://ftp.tapr.org/pub/n5eg/current.htm



	Changes for Version 1.6:

1. The screen attempts to display properly if the device resolution is set
 to 120.0 DPI rather than the Windows standard 96.0 DPI resolution.

2. The Instrument Calibration dialog box has been reduced in height to fit
 within a 800x600 display size.

3. The Instrument Calibration routine implements some very rudimentary error
detection on TRANS and REFL amplitude calibrations. Previously, the routine
would blindly accept any results even if they were grossly wrong. The error
detection cannot detect all (or even some common) error cases.  The
instrument
calibration routines do not calculate values differently than version 1.5,
so
it is not necessary to re-run Instrument Calibration unless you suspect and
have seen gross errors.

4. A new menu option allows exporting S-parameters in CSV (Comma Separated
Variable) format, which is compatible with Microsoft Excel. It also inserts
formulas for deriving Zin (S11) and Zout (S22) onto the spreadsheet.

5. The menu items Save Configuration File, and Load Configuration File have
been renamed to Save Configuration + Measurement File, and
Load Configuration + Measurement File. The function of the software, and
the files themselves are unchanged from version 1.5.  Apparently many people
did not know that instrument measurements could be saved and reloaded, and
this change tries to make the menu function more obvious.

6. The TxLevel range has been opened back up to 0 to -40 dB as a convenience
for those using the VNA software as a generator. Output levels below -10 dB
are out-of-range for VNA use and result in wrong measurements, a Range
Warning
dialog box will pop up when trying to adjust the level below -10 dB.