[FoxHunt] IARU controller question

[Kuon & Dale Hunt]

>Now I am confused.
>
>A2A will generate a carrier and two sidebands that are in phase and will
>be limited
>out in a "good" FM receiver leaving you with no tones. F2A (narrowband FM)
>will
>generate two sidebands that are out of phase and will not make tones in a
>"good" AM
>receiver. SSB, with carrier, will work on both to make tones.
>
>WBob



   An FM signal can be received on an AM receiver by slope detection:
   tuning the receiver slightly off from the carrier frequeny.  Using
   the Ron Graham receiver as an example, this means that the loudest
   audio tone and the strongest received signal strength in VCO mode
   do not occur at the same spot on the tuning dial.

   Receiving an AM signal on an FM receiver tends to work in practice
   (probably because our receivers are not perfect) though the tone
   level is rather low.  I think one factor here is that usually when
   hunting we use an attenuator to knock the signal down to where it
   shows on the S-meter, which has a very limited range on most FM
   receivers.  Often the signal may not be full limiting, so the
   AM still comes through to some extent.


   Since when hunting we want to detect amplitude variations in the
   signal when we rotate the antenna, AM receivers tend to be more
   natural to use (especially when listening to the strength of the
   received signal by ear to find the strongest point.)