[Orion] Sherwood test results reformatted

[Bill Tippett]

W0YG wrote:
 >So, if this doesn't wrap, you can see that Rob's test give a 93dB dynamic
range with the 1 KHz filter at a close in spacing of 2 KHz, something the
ARRL test does not explore.

         Charlie, ARRL does test close spacings (to 1 kHz) but you have to
interpolate the bottom left graph on page 20 of their Expanded Test Report
instead of reading from a table.  There is very close agreement (1 dB)
between Sherwood's IMD  and ARRL's IMD measurements, both Preamp Off and
using the 1000 Hz roofing filter:

Spacing Sherwood        ARRL

1 kHz   85 dB       84 dB
2 kHz   93 dB           92 dB

My best guess for the Inrad #352 600 Hz Kit is that it will improve
the 1 kHz measurement to about 93 dB, and probably in the range of
85 dB for signal spacings of ~500 Hz.  Nobody tests spacings this close
...except for many contests.  ;-))

         The very close agreement between the Sherwood and ARRL measurements
give me greater confidence in both.

                                         73,  Bill  W4ZV