-----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Chase, John Sent: Friday, August 11, 2006 12:10 PM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: Damping Fields
<snip> Actually, commercial airliners use the same VHF nav/comm band as general aviation for air traffic control and navigation purposes. The military uses the UHF nav/comm band. <snip> I've often wondered about that. I have sometimes heard Cleveland (CLE) approach, and Akron-Canton approach (CAK) talking to some airliner (United, American, etc.) but never heard them talking back (same kind of thing with Pittsburgh, Columbus, Indy, etc.). Now I know that some controllers are ganged to handle two or more radios (I've even been at CAK and Springfield MO after 10PM and the approach, tower and ground were all the same person - you talk about a bored controller). But I never heard the Big Iron pilots talking and I was supposed to be following them (visual approach) -- You should try this when vis is < 2 mi and they are doing 160+Knots and you are firewalled doing 120Knots and you're #2 for the ILS ;-) Now, at Youngtown OH and Mansfield OH (both are C130 bases or were until very recently), I heard those guys all the time on the "regular" low freqs for approach, tower and ground. However, I can tell you that 151MHz does really UGLY things to the HP3000s! Hagerstown MD's HP3000 for the city was 3-4 stories above the police garage exit. The patrol car drivers had a regular policy to double tap the xmit button on their radios as they came out of the garage.... Well, HP was out for the umpteenth time trying to figure out why this HP3000 had locked up again. So they had effectively done a POR to get it running. So their FE walked over to the window (which was covered with metal mesh and the glass had metal mesh in it) because he was tired of staring at a scope trying to figure out what was wrong with this happy little computer system. About that time a police car drove out of the garage and the HP3000 locked up... <Big Bright LIGHT goes on here> The rules were if you keyed your mike before you got to the street, your paycheck would be the one that was done entirely by hand... And the lock-ups ceased. Later, Steve Thompson ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
