Re: V12 first try
¿ªÔÆÌåÓýWhat stage of building are you at Larry? ? ? As for me¡ ? I¡¯m spending the day running some final tests on the 100W module.? I can see I need to use a different current measurement resistor on the board.? It¡¯s a 3W 0.005 ohm SMD resistor and that will be a problem if the board flexes (cracks). ?I think I¡¯ll use a T0-220 resistor instead.? It doesn¡¯t get warm, but I¡¯m wary of the physical characteristics of the SMD resistor.? That modification is an easy one.? I also have a hole in the middle of the board that is too small to get at the screw that holds the temperature the bias compensation junction (a Darlington junction) to the heatsink near the two output transistors.? I also am using two 1N4148 diodes in the bias circuit where Oliver used a size I can barely see¡ so I think I¡¯m gonna have him change those to regular through-hole diodes.? Otherwise the amp is working extremely well (and has been for about 8 months).? I¡¯ll publish performance plots shortly. ? ?
? 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: Larry Acklin <acklin@...>
Sent: Saturday, December 21, 2024 4:54 PM To: [email protected] Cc: K9HZ <bill@...> Subject: Re: [AmateurRadioBuilders] V12 first try ? Hook the antenna right to the rf board as a sanity check. Then move back to the next connection, work towards?the antenna RF connection. I had a loose SMA cable and or chassis connection that gave me trouble in my early spin up stages.? ? Larry KB3CUF? ? On Sat, Dec 21, 2024 at 5:37?PM jerry-KF6VB via <jerry=[email protected]> wrote:
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