[Elecraft] [K3] K3 FSK power transients

[Joe Subich, W4TV]

> I'm surprised I can see a difference between the two tones 
> through the flatter filter 8-pole filter. It's just enough 
> to see on the 200W scale of an old (pretty much uncalibrated) 
> Daiwa CN-520.

With the 8 pole filter I see 2 watts difference on the N8LP 
LP-100 wattmeter.  However, in AFSK A or DATA A modes for 
PSK I see as much as 15 watts (0.7 dB) difference (maximum 
to minimum) as the tone frequency varies from 200 Hz to 2800 
Hz in DATA A (FC=1500 Hz) or 1000 Hz to 3500 Hz in AFSK 
(FC=2210 Hz). 

73, 

   ... Joe, W4TV 
   



> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Randy Farmer
> Sent: Sunday, September 27, 2009 7:57 PM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] [K3] K3 FSK power transients
> 
> 
> The roofing filter IS offset to put the RTTY tones (Data | 
> Pitch) in the center of the filter.
> 
> Good to know. That's how I would have done it I were the designer. 
> I'm surprised I can see a difference between the two tones through 
> the flatter filter 8-pole filter. It's just enough to see on the 200W 
> scale of an old (pretty much uncalibrated) Daiwa CN-520.
> 
> 73...
> Randy, W8FN
>