Narrative:

I have noticed a significant and consistent increase of frequency interference (loud static) over 123.77 (pdx tower) that is hard to talk over via the interphone. These events are occurring on final and departure; at various altitudes (including below 1;000 ft afe) in various tail numbers. While it doesn't seem to affect comm transmissions or reception; it can significantly interfere with crew communication. Duration has lasted approximately 15 seconds or more on some occasions. It seems like interference issues which were encountered some time back; have resurfaced. It doesn't appear to be called out by other traffic or caused by someone's stuck mic. It also could be limited to our type of aircraft since the Q400 radios continue to be sub-par.

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Original NASA ASRS Text

Title: Q400 Captain experiences frequency interference (loud static) over 123.77 (PDX Tower) that is hard to talk over via the interphone.

Narrative: I have noticed a significant and consistent increase of frequency interference (loud static) over 123.77 (PDX Tower) that is hard to talk over via the interphone. These events are occurring on final and departure; at various altitudes (including below 1;000 FT AFE) in various tail numbers. While it doesn't seem to affect comm transmissions or reception; it can significantly interfere with crew communication. Duration has lasted approximately 15 seconds or more on some occasions. It seems like interference issues which were encountered some time back; have resurfaced. It doesn't appear to be called out by other traffic or caused by someone's stuck mic. It also could be limited to our type of aircraft since the Q400 radios continue to be sub-par.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.