I can personally confirm that W2VJM (Inrad) is working full-time on the OMNI
VI+ mod., and I assure it will be worth waiting for.
For an indication of the IP3 DR performance improvement that [can] be
achieved in an OMNI VI+ (Opt 3), I have tabulated the measured data of an
8-pole roofing filter mod. (of my design) and that of the OEM 2-pole
monolithic crystal filter with a 15 kHz BW.
Measurements were performed at 3.5 MHz using the ARRL Test Procedures
Manual, Rev. G (Sect. 5.8) and nearly identical test equipment.
Offset OEM K1FK Mod.
-20 97.4 100.0
-15 92.0 100.0
-10 87.1 99.7
-5 82.0 99.6
-4 79.8 98.3
-3 78.5 97.0
0
+3 79.0 98.0
+4 81.0 99.3
+5 83.2 99.7
+10 88.0 100.0
15 93.2 100.0
20 98.0 100.3
73, Dave, K1FK
Fort Kent, ME
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