East Midlands Airport

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Re: East Midlands Airport

Postby Tommyjoe » Tue Dec 24, 2019 8:51 pm

Thanks all for your inputs. :thumbup:
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Re: East Midlands Airport

Postby Neil57uk » Tue Dec 24, 2019 9:22 pm

The channel described as 123.805 is frequency 123.800 mhz so simply enter 123.800.
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Re: East Midlands Airport

Postby Minus1 » Thu Dec 26, 2019 9:28 am

Chris P wrote:I must be programming My 3500 incorrectly as it will accept 123.805 as a direct entry even when set at 8.33Khz step


It accepts it, but the display reads "123.8083MHz" - which is wrong. It should be 123.800.
Uniden didn't understand 8.33 channels when they wrote the firmware.
I reserve the right to ignore people who have made no attempt to the read the manual, and expect others to do it for them.
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Re: East Midlands Airport

Postby AndrewIrvine » Sat Dec 28, 2019 12:00 pm

Minus1 wrote:Apart from the localizer, those are channels not frequencies :wink:


Aren't channels listed as numbers, as opposed to frequencies, which tell you the frequency? Or does that only apply to airband? I've never heard harbour masters ask those in ships to go to 156.700 etc...
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Re: East Midlands Airport

Postby Chris P » Sat Dec 28, 2019 5:17 pm

Airband and Marineband protocols are different. Marine bands have been channelised for a long time (if not from its origins) ,airband has only been channelised since the onset of 8.333Khz channel spacing introduced to provide an increase in the number of frequencies available
Marine channels are still widely spaced due to the reduced risk of co-channel operation / interference issues. There is not a need for a larger number of available frequencies
Aircraft transmissions can be heard over far greater distances due to the height of the aircraft often several hundred miles so the risk of co-channel interference is much higher . Marine mobiles, namely ships and shore stations have a very short range as ships and shore stations antennas are usually only a few metres above sea level giving a line of sight range of only 20-30 miles (under normal conditions).

Modern VHF transceivers have improved over the years since their conception in the 40`s particularly in the front end bandwidth so closer step size is now a viable proposition .
Regards Chris aka G8FFF nipper or tazmin88
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Re: East Midlands Airport

Postby Chris P » Sun Dec 29, 2019 7:31 am

I forgot to add that many of the Marine channels are duplex where one station transmits on one frequency and receives on another for example the ship to shore channels where the ships transmit in the 156 Mhz range and the shore stations transmit in the 160 Mhz range
Regards Chris aka G8FFF nipper or tazmin88
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