At 12:03 PM 11/20/2005, Jeff Anderson wrote:
I should add that, because carrier suppression varies with frequency, I
doubt that it's simply an issue of capacitance leakage. Parasitics would be
my bet.
By the way - what's generally considered to be an acceptable level of
carrier suppression when operating sideband?
Wouldn't this fit under the "spurious emissions" requirements? 47cf97.307
has the details
...b) nothing that's out of band is acceptable.. so, if you're operating
close to the band edge, and image rejection is poor, you could get bit. As
a practical matter, if it's down in the thermal noise floor, it's hard to
detect.
...c) must be as low as practicible
...d) can't be more than 50mW or -40dBc which ever is lower (except if Tx
power is <5W, in which case it's -30dBc: which would be 5mW) this is for
HF.. for >30MHz the limits are tighter.
If you're radiating 100W (+50dBm),then the -40dBc will be tougher. Those
of you running some more fire in the wire might have to watch the 50mW
limit (1kW is +60dBm, and the 50mW limit is +17dBm, -43dBc)
Jim, W6RMK
