> Don't despair. George, W2VJN is working on, displayed some,
> and coming out with roofing filters for the rest of the
> "old loser" radios like FT1000D etc., so don't dump them
> yet. While they would still use high IF upconversion, but
> the improvement in performance would rival IC7800, going
> from 60ies some dBs to high 80ies (Orion is in low 90ies).
More specifically:
The INRAD information is not currently on the web site. George
told me they would update the data after they returned home (a
leisurely trip back to the west coast in their RV). Look for
the data in a couple of weeks.
The FT-1000MP/MKV filter comes on a board that installs in
place of the 70 MHz IF mod. The board includes impedance
matching and a post filter amplifier that has about 2 dB of
excess gain (gain in excess of the filter loss) vs. 8dB of
gain in the "noise reduction" mod.
Performance specs (IMD Dynamic Range) in the FT-1000MP are:
Signal spacing Dynamic Range
10 KHz 107 dB
5 KHz 100.5 dB
3 KHz 97.5 dB
This compares to an unmodified narrow dynamic range in the
mid-80 dB range (from memory).
Price will be $165 ... deliveries are scheduled to start in
four to six weeks. INRAD also has a roofing filter for the
TenTec Omni VI series and are working on roofing filters for
the IC-765/IC-781.
At present there is no roofing filter modification for the
FT-1000/D (different first IF frequency and circuit) but
George has several offers of service manuals and test bed
radios. I would expect (hope for) a FT-1000/D version soon
after the IC-765/IC-781.
I certainly can't see spending > $10K the IC-8000 or
FTdx-9000 when comparable performance can be achieved for
much less than half the price with a pair of the "tried and
true" radios and added roofing filters.
73,
... Joe, K4IK
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