[Elecraft] Data mode and filters

[Jim Brown]

Joe,

Your logic is still faulty.

For my measurements, I set the K3 for 100W, recorded the power measured 
by the LP-100A, which we both agree can miss some peaks, SO according to 
your logic, I WAS overdriving the K3. Yet, the measured bandwidth is 
quite narrow.

On Sun,5/17/2015 6:38 AM, Joe Subich, W4TV wrote:
>
> > No, but they/we can put a calibrated peak-reading wattmeter like the
> > LP-100A in line with the feed to our antennas.
>
> While a peak reading wattmeter like the LPA-100 is a good step, it
> still does not respond to instantaneous peaks.  Most "peak reading"
> wattmeters will show peak values that vary depending on the PSK31
> datastream and never show the true instantaneous peak.
>
> > And last I looked, few hams run much power with PSK-31.
>
> They have to do that or they would be clipping terribly in the final
> amplifier stage (or in the transmit IF of some poorly aligned rigs).
> They certainly can't push the rigs to 100W as your tests would imply.

My measurements clearly show what a K3 does when set to 100W.

73, Jim K9YC
>
> 73,
>
>    ... Joe, W4TV
>
>
> On 2015-05-15 12:44 PM, Jim Brown wrote:
>> On Fri,5/15/2015 9:10 AM, Joe Subich, W4TV wrote:
>>> The vast majority of amateurs do not have calibrated scopes on the
>>> output of their transmitter/amplifier to keep the instantaneous peak
>>> output below the onset of compression in the final stage of power
>>> amplification.
>>
>> No, but they/we can put a calibrated peak-reading wattmeter like the
>> LP-100A in line with the feed to our antennas.
>>
>> And last I looked, few hams run much power with PSK-31. As both my
>> measurements and K6XX measurements clearly show, IMD in the K3 drops
>> significantly below full power.
>>
>> 73, Jim K9YC