[Elecraft] OT - Power and my earlier post

[Bob McGraw K4TAX]

Yes and when running PSK-31 if you don't get IMD reports of between -21dB and/or more like -29dB then most likely something at your station needs improvement. Usually overdrive either in the audio system or RF path is a contributing factor.  ALC action is often one culprit.  Some radios leave the SP or EQ circuits in the path. They should be OFF or bypassed.  

Bob, K4TAX


Sent from my iPhone

> On Oct 17, 2018, at 9:35 PM, Walter Underwood <wunder at wunderwood.org> wrote:
> 
> Specifically about PSK31, that encoding needs a very linear transmit system. The 25 W recommendation keeps the signal and the peaks in the linear region of most 100 W amps. Modes that do not use phase shift keying on a single carrier might not have the same linearity requirements.
> 
> A clean 25 W PSK31 transmission might be heard better than a distorted 100 W PSK31 transmission.
> 
> wunder
> K6WRU
> Walter Underwood
> CM87wj
> http://observer.wunderwood.org/ (my blog)
> 
>> On Oct 17, 2018, at 6:52 PM, Jim Brown <jim at audiosystemsgroup.com> wrote:
>> 
>> On 10/17/2018 6:36 PM, Bob McGraw K4TAX wrote:
>>> At the same time, many of my contacts are made with 50 watts or less. 
>> 
>> Yup. I mostly use FT8, JT65, and MSK144 on 6M and 160M. I generally run as much power as I can on 6M, and on 160M to work EU or AF. OTOH, I'm still trying to finish 160M WAS QRP (need VT and SC), and recently worked the KH1 expedition on 160 with 5W using FT8. They were specifically using FT8 trying to put some EU stations in the log. I've since learned that AA7JV was the op.
>> 
>> 73, Jim K9YC
>> 
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