[Kenwood] TS-930 Roofing Filter

[Bill Tippett]

K4CZ:
 >Has anyone installed and used Inrad's TS-930 roofing filter? Would
appreciate any feedback, particularly regarding use in contesting.

         Yes and it makes a noticeable improvement.
You can see the comparison of the stock and Inrad filters
on page 1 below:

http://www.qth.com/inrad/TS930-Roofing-Filter-Manual.pdf

However, the 930 is still susceptible to IMD products
from interfering signals that fall inside the roofing
filter bandwidth.  The critical area for roofing filters
is about 30 to 35 dB down on the skirts.  You can see
above the Inrad has about 3.5 times less bandwidth than
the stock filter at 30 dB down, plus its ultimate
rejection is much better (>70 dB versus ~35).

                                         73,  Bill  W4ZV

P.S.  Not anywhere close to an Orion (my other rig) but
definitely a worthwhile improvement.