w2aew | #333: Installation and test of Narrow CW filter in Icom IC-703 - Filter: Inrad #116 @w2aew | Uploaded June 2021 | Updated October 2024, 11 hours ago.
This video shows how to install an optional narrow CW filter in the Icom IC-703 transceiver, then runs some tests to show the operation and effectiveness of the new filter in dealing with adjacent signal interference. Here is a link to the filter I used in this video:
inrad.net/product.php?printable=Y&productid=130
0:00 - Introduction
0:24 - Icom and Inrad Filter choices
1:25 - Begin installation
1:53 - Main board removal
3:10 - Install filter
4:10 - Re-install main board and reassemble rig
4:55 - Configure rig to use filter and verify
5:33 - Listen to the effect of the filter
5:51 - "See" the filter shape using an FFT
7:00 - Listen to filter effect on two closely spaced signals
9:00 - FFT of filtering of closely spaced signals
10:48 - "On-air" demo of filtering away close-in signals
11:06 - Closing