[1000mp] MP Roofing Filter from INRAD

[Garry Shapiro]

Joe, K4IK wrote:

Also at Dayton, INRAD have introduced a narrow roofing filter
for the FT-1000MP, MKV & Field.  Filter is 4 KHz wide and
provides the following IMD specs:

            Signal spacing      Dynamic Range
                 10 KHz            107   dB
                  5 KHz            100.5 dB
                  3 KHz             97.5 dB

This compares to IMD numbers previously in the 75-80 dB range
for signal spacing less than ca. 20 KHz.

$165 list price for the roofing filter ... I suspect many may
opt for it rather than spend $13K for a FTdx-9000!

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When I visited the INRAD booth at Dayton, I learned from George, W2VJN that
the roofing filter is installed ahead of the IF---in place of the IF "hiss
filter" mod that many have installed presently. It is apparently an
"either-or", so that those with the IF mod will need to choose between a
quieter RX for weak-signal work or more-robust strong-signal performance for
contest work. As both a contester and a weak-signal DXer, I am holding off
making that Solomonic choice.

I am hoping George, who participates in this list, will add some comments
about this new product that will facilitate my decision.

Garry, NI6T