On 3/29/2012 11:59 PM, Bill Turner wrote:
> This whole argument over AFSK vs FSK is really nonsense. Both terms,
> as commonly used by us hams are FSK, plain and simple. How one
> generates FSK is technically interesting but not relevant to the
> signal that goes out over the air.
Well, I would respectfully beg to differ. The "signal that goes out over
the air" can be relevant.
If a modern radio -internally- uses 'AFSK', usually no problem.
However, if someone is putting tones into the mic jack -- and has their
mic gain too high, they will generate spurious (or 'ghost') signals up
and down the band...and I know you have been in the game long enough to
have heard this on the bands.
If you use what I call 'true FSK', i.e. a varicap diode changing the
frequency of your VFO, the trouble condition mentioned above cannot occur.
So, I agree with your statement above in relation to modern radios, but
it wasn't always so.
Just my 2 cents...
73,
Carter K8VT
_______________________________________________
RTTY mailing list
RTTY@contesting.com
http://lists.contesting.com/mailman/listinfo/rtty
|