开云体育

So you probably want to characterize the gain (loss) from the antenna input on the LPF to TP6 of the RF board since we specifically put U2 in to overcome the loss from the BPF and the attenuator on

The insertion loss of the attenuator chip when set to 0dB is roughly 2dB below 20 MHz and increases at higher frequencies, so the loss you're seeing is expected. See this plot of the receive

Cool! Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa Grand Piton - J68HZ Soufriere,

Look at Oliver, sportin' V066.7 Go Oliver!

Hi Bill- That is a bit of roll-off in the baseband circuitry which follows the QSD (quadrature sampling demodulator). That's a trade-off when using the demodulator for both demodulation and as a

Thanks to all for the help. I was misunderstanding the signal path, thinking that the BPF was out of the signal path during transmit. My T41 is working with several watts out! Now to finish

Need to calibrate it. Its not absolute. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator

Good morning Greg, Last night was able to get the T41-2 main board/qse2/qsd2 combination working in what was originally a 4SQRP T-41k. (so far just on receive) I noticed that the right side of the

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