... 327 Mhz birdies . ... The table below comes mainly from azimuth swings done on 28oct05 (more info) . If a birdie varies with azimuth, then it is coming from outside of the dome. 327 birdies ( top ) . freq . ... Birdies coming from the azimuth encoder comb ( more info ). ... azimuth enc comb freq in 327 band . ... a birdie drifting up to 4 mhz in 24 hours was seen in the 327 receiver feb,mar14. ... 120 fdma chan in 5.15 Mhz. ... This comb is centered on the 40 Mhz comb harmonics. ( more info ). ...