Re: RA8875 display problems with T4.x - a visual study
¿ªÔÆÌåÓýThe noise floor for the current V12 radio is better than -100 db as measured without the driver chip¡ My V11 with the buffer chip is nominally -78 db.? That is ok for a test platform (toy level) but intolerable for a modern radio¡ The new display driver board does not change that -100 db figure because it was designed specifically to buffer SPI signals (in that frequency range with softer on-off switching). ? ? 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 Terrance Robertson, KN6ZDE via groups.io
Sent: Tuesday, March 25, 2025 4:08 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] RA8875 display problems with T4.x - a visual study ? On Tue, Mar 25, 2025 at 01:19 PM, K9HZ wrote:
I've been happy with my 4SQRP T41, but I don't have much experience with this.? What's considered an "intolerable" noise level for that radio? ? Currently, my partially built v12 has a receiver noise floor 48 dB above my 4SQRP unit.? I have enough experience to know something is wrong with my v12 build. |
K9HZ