Fri Dec 14, 2018 1:14 pm
#1657747
Why are Peterborough Conington staying on 25kHz? Does anybody know?
to 8.33kHZ channel on the same frequency.
xtophe wrote:Special mention to Prestwick and Glasgow who don't know when they are changing despite having 1 year to prepare.
James Chan wrote:to 8.33kHZ channel on the same frequency.
It's not quite the same? You mean to the one nearest to the existing 25Khz frequency?
Iceman wrote:
Any 8.33 kHz channel that has a channel offset of 0.005 from its previous 25 kHz frequency, e.g., Blackbushe has gone from a frequency of 122.300 MHz to the 8.33 kHz channel 122.305, similarly xzy.a25 to xyz.a30, xzy.a50 to xyz.a55, and xzy.a75 to xyz.a80 has not changed frequency at all. All of these 8.33 kHz channels are using exactly the same frequency as they did before, e.g., Blackbushe is still radiating and receiving on a frequency of 122.300 MHz. The channel offset of 0.005 does not change the frequency by an increment of 8.33 kHz, it merely instructs the transceiver to limits its transmit and receive bandwidths to an 8.33 kHz channel spacing based on the 25 kHz frequency.
To get a genuinely new frequency in 8.33 kHz land, you'd have to be using one of the new 0.010 or 0.015 channel offsets from a 25 kHz frequency designator, the new frequencies then being 8.33 kHz and 16.66 kHz offset from a 25 kHz frequency.
Iceman
lobstaboy wrote:But yes, it's silly - it's the only system I know of where the 'frequency' given to you and displayed on the radio is not the actual frequency of the radio signal. Bonkers or what?
GrahamB wrote:lobstaboy wrote:But yes, it's silly - it's the only system I know of where the 'frequency' given to you and displayed on the radio is not the actual frequency of the radio signal. Bonkers or what?
You’ve never tuned into a DME then?
Iceman wrote:Any 8.33 kHz channel that has a channel offset of 0.005 from its previous 25 kHz frequency, e.g., Blackbushe has gone from a frequency of 122.300 MHz to the 8.33 kHz channel 122.305, [snip]
lobstaboy wrote:GrahamB wrote:lobstaboy wrote:But yes, it's silly - it's the only system I know of where the 'frequency' given to you and displayed on the radio is not the actual frequency of the radio signal. Bonkers or what?
You’ve never tuned into a DME then?
Certainly not!
But channel numbers don't count - they clearly aren't masquerading as frequencies in the same way.
riverrock wrote:..
I understood that airports don't get a choice - its changed at licence renewal. ..