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The transmit attenuator is working in that the amount of attenuation is able to be adjusted by the setting in the Menu. However at the 0dB attenuation setting I am getting -3dB. I have a 50 ohm load

And this is what i get when i text on my phone at 5 AM… Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner

With the replacement of the follower and filter op amps post mixer, i see about a 7db improvement and at that point i believe the limit is the mixer, si 5351, and line shielding between the. We are in

Greg, I get a very similar number for the noise floor (-131 dBm) if I tune away from the display noise, so the V12 hardware is capable of achieving similarly low noise floors if you can fix the

Mark, I don't see the disappearing audio issue in the beta version of the code (V66-7) that I'm testing, so it's been fixed. It'll come out soon; Al has rewritten the calibration routines and added

Great! 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 Grand Piton – J68HZ

The Pulsing went away with 66 on my build, seems I saw those on 20M but I believe they are gone or diminished with the ferrite sleeves on ribbon cables. Mine? is apart while I wrap up PA testing and

Here's the T41-2 which uses the QSD2, a revised version of the original V11 board: https://drive.google.com/file/d/1ZmqkRsnVGrcBpf1ZM9f3BB41y7U0VuU2/view?usp=sharing The signal is from a TinySA set to

Wow, significantly better.? V066.1, no cal performed.? Pulsating noise is gone.? This is just a first look (really just a peek), still need to check things out.? One thing I notices is that after

Thanks Bill.? I'll download it today and let yall' know. Mark KU3O

Thanks Oliver.? This will be extremely helpful. Mark KU3O

Hi Mark, I thought it might be helpful to show the noise levels I get on my rig. It is a prototype rig that I use for testing software and hardware changes, so I've done nothing to try to reduce the

Hey Mark… you should try the latest SW from Jack and Al. It all works on my 4 radios without a glitch. Also I should be back home on the 14th… so if you need any boards, i have them. Dr. William

Hey Tom, I've replaced the DAC and ADC and all surrounding components to no avail.? If there is a problem with the build, it's somewhere I can't get to (under a connector or something, I think

Sorry, I was looking at the BPF.

This is the schematic I'm working from: https://github.com/DRWJSCHMIDT/K9HZ/blob/main/K9HZ_LPF_Module/K9HZ_LPF_V1.00_Schematic_PDFs/K9HZ_LPF-Control_Board_Schematic_V1.10_02-14-24_KiCad.pdf

U3 and U4?

When TX_BPF_SEL is LOW, then RF2 is selected on U3 and U7 (BPF is bypassed for the TX path). When TX_BPF_SEL is HIGH, then RF1 is selected and the BPF is placed in the path. U3 U7 TX_BPF_SEL Pin 6/A

According to the data sheet this is correct, selecting the BPF for transmit sets TX_BPF_SEL high resulting in a high on pin 6 of U3 which in turn connects RFC to RF1 which is the BPF connector. So no

I have checked the wiring,but still can't find the problem. Everything is working on the T41 except U3 on the LPF-Control never puts the RF on RF2, (P3). The logic of TX_BPF_SEL is putting a high on