[FoxHunt] IARU controller question

[Kuon & Dale Hunt]

>>     As those of you know who have attended ARDF events in other
>>     Regions, keyed-carrier AM tone modulation is the standard.
...
>>
>>     This provides an experience similar to hunting 80m signals -
>>     you can only take a bearing during the tone portion of the cycle.
>
>I'm not sure I understand this.  There's A1 which is straight CW,
>and A2 which is a continuous carrier with an AM tone which is keyed.


    Actually the designator "A2" only identifies an AM tone
    modulated signal.  This would apply whether the carrier is
    continuous or keyed with the tone.

    The standard Region 1 transmitters key the carrier along
    with the tone.  I suspect this was originally to save
    battery power, especially back in the days of tube transmitters.
    It can be generated by modulating a transmitter with a
    continuous tone and keying the carrier on and off.