Re: LPF Control Board addressing help
¿ªÔÆÌåÓýOOPS¡ was reading linearly and missed this response. ? ? Dr. William J. Schmidt - K9HZ J62K(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 Oliver KI3P via groups.io
Sent: Wednesday, April 23, 2025 3:42 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] LPF Control Board addressing help ? Soldering JP2 while leaving JP1 and JP3 open makes the address bits 101 (they are high by default and soldering the junction pulls them to ground). This should correspond to the address 0x25, as you say. ? ? The AD7991 chip that is also on the LPF control board has an address of 0x28 or 0x29, so I think that's what you're detecting with the I2C scan. This confirms that the cable isn't broken -- something must be wrong regarding the MCP23017 chip on your board. Look for solder bridges, missing parts, misalignments, etc. ? ? ? ? ? On Wednesday, April 23rd, 2025 at 2:41 PM, Robert Luken W3RDL via groups.io <now.w3rdl@...> wrote:
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K9HZ