FW: [FlexRadioSmartSDR] Adaptive Predistortion Progress
¿ªÔÆÌåÓýfyi ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of Rob Sherwood via groups.io
Sent: Thursday, February 13, 2025 7:25 PM To: [email protected] Subject: Re: [FlexRadioSmartSDR] Adaptive Predistortion Progress ? Hi James, ? Certainly overdriven linear amps are a problem, but solid-state rigs and solid-state amps without pre-distortion are depressingly non-linear.?? Here in rebuttal is ?another slide from my CSI Flex presentation.? In this case the clean signal is an Apache 200D with a solid-state amp in the correction loop compared to my TS-890S and my Alpha 89 being carefully monitored with a Tektronix scope to assure no linear flat-topping.? My non-predistortion signal is virtually the same as the Flex 6600M and PG XL.? All Flex has to do is ship pre-distortion and it can look like the Apache PureSignal and Icom DPD examples.? ? ? Rob, NC0B From: [email protected] [mailto:[email protected]] On Behalf Of jjames700 via groups.io ? Rob, The image of the 6600M looks more like someone that is over driving the amplifier and causing splatter.? I think nearly all the splatter seen on the bands is caused by the operator more than anything else.?? James? WD5GWY? ? |
K9HZ