Re: FW: [FlexRadioSmartSDR] Adaptive Predistortion Progress
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It's different for every different amp design... needs to be tested, BUT IN GENERAL you want enough headroom so that you never reach saturation of the devices... that means PTP power divided by four.
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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: www.VillaGrandPiton.com Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. email: bill@... -----Original Message-----
From: jerry <jerry@...> Sent: Friday, February 14, 2025 9:09 PM To: [email protected] Cc: K9HZ <bill@...> Subject: Re: [AmateurRadioBuilders] FW: [FlexRadioSmartSDR] Adaptive Predistortion Progress On 2025-02-14 16:16, K9HZ wrote: More mumbling about APP¡ operating the amp at less than 25% of its*** Does it have to be 1/4? How much improvement would 1/2 of available output give you? I recently saw a new LDMOS device that's rated for 2.5kW CW output. I think it runs off 75V. I was thinking that at 1.5kW output, it might be pretty clean. Or would IMD due to near flat-topping be replaced with IMD due to crossover distortion? - Jerry, KF6VB |
K9HZ