Iceman wrote: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?
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
This.
People seem to be misunderstanding what the change actually means. For example, North Weald went form 123.525 to 123.53.
The frequency itself stays the same (123.525) but the new number - effectively now a channel number, not a frequency - is to tell the comms unit to operate at 123.525 but over a 8.333KHz bandwidth. If you dial in 123.525, it will still transmit at the same frequency but at 25kHz bandwidth.
If the transmitter is incorrectly set to 25Khz b/w and the receiver is 8.333, then the receiver may lose some of the signal, and the signal may stomp on the new channels (if active) either side.
If the receiver is incorrectly set to 25KHz and the transmitter to 8.333, then the receiver will hear the signal fine. But of course it may also receive the new channels (if active) either side.
I hope..!