[Elecraft] unequal power output per tone in FSK

[Joe Subich, W4TV]

After properly performing the TX Gain calibrations, I don't
see any significant difference between tones (K3 s/n 477):

               Mark       Space     Difference
   at 100W    100.50     100.40      -0.004 dB
       80W     80.70      79.50      -0.06 dB
       60W     60.90      60.00      -0.06 dB
       40W     40.50      39.70      -0.08 dB
       20W     20.22      19.61      -0.13 dB

Measured into a known flat 50 Ohm dummy load with TelePost LP-100
watt meter.  K3 is keyed in FSK, power at mark recorded and the FSK
line closed and power at Space tone recorded without opening PTT.
If PTT is opened and closed between reading power at Mark and Space,
the two power levels are identical within the resolution of the
watt meter.

73,

    ... Joe, W4TV


On 1/10/2011 7:07 PM, Eric Swartz - WA6HHQ, Elecraft wrote:
> 5 pole 2.7 kHz SSB filters will also have a little more natural ripple
> than the 8 pole 2.8s.
>
> 73,
> Eric
>
>
> On 1/10/2011 3:35 PM, Wayne Burdick wrote:
>> Hi Hank,
>>
>> The difference in amplitude is due to the small amount of ripple in
>> the crystal filter. The effect on transmission bandwidth is
>> negligible, and it's also extremely unlikely to affect copy.
>> Nonetheless, we're planning to provide a way to tune out the difference.
>>
>> 73,
>> Wayne
>> N6KR
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