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The situation I think we might have is that both TX_BPF_SEL *and* RX_BPF_SEL are HIGH during SSB transmit. This lets a little bit of the transmitted signal leak through the TR switch back into the

I just tried this. Rings like a bell. 8W out on 10M without talking. - Jerry, KF6VB

One quick correction Bill: I have a 3.3V display, not a 5V display. Thank you!

I do and I’m glad you offered. It will go out today. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois

Yeah me either… I have not spent more than 2 days in a row in our house in the last month due to conferences, vacation travels, contests, family events, etc. Hope this settles down before

Bill: my new radio layout is prone to the display freezes, so I'd be happy to test one of your display buffers (5V) if you have any available for testing.

My radio is still offline as I rebuild it after the burning smell. Still waiting on a replacement Teensy to be delivered. So I'm not much help at the moment.

And this works perfectly on your radio… correct Oliver? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner

Jerry, Yeah, That fixed it. Thanks, Paul M. KC2TVJ

I won’t be able to test till Monday dave

The code that controls the LPF is here: https://github.com/KI3P/SDTVer066-9/blob/main/SDTVer066-9/LPF_Control_V12.cpp Can you try out version 66.9 of the code and see whether the problem persists?

Well…. What I can tell you… working backwards towards the code, TX_BPF_SEL and RX_BPF_SEL, or GPA0 and GPA1 for U15 which is I2C address Hex 0x25 on WIRE2. GPA0: HI = BPF In Circuit During TX, LO

Hey yall', I ran the LPF test .ino along with the K9HZ LPF Prototype Test Report using MAIN and all modes and functions pass.? So all LPF control board HW works with in-band loss for LPF about -0.5db

I have some but its stashed away in the office I’m moving… and of course, I just had a colonoscopy 4 hours ago… so will find it in a few days. What I know is that we are at the limits of the

The DC operating point would seem to be that of Fig 1 of the data sheet for the PSA-8A+.? But that is fine, either way.? I was hoping to get some data on noise level data of other implementations of

Ok so what's the problem then? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa

“this puts 30+ dB of gain right ahead of the QSD?” no no no… its operating at a voltage that provides much less gain… Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

First, R8-R11 should NOT BE POPULATED under I2C control. U15 pins GPA0 and GPA1 should ALTERNATE STATE. NOTHING should be plugged into J1 unless it LISTENS ONLY. U3 and U7 appear to be working

*** It is. It's also one of the settings accessible by poking at the volume control knob switch. - Jerry

Why isn't this a menu item? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa