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Our booth at Hamvention is inside this year… 4111 in building 4. You can buy the lasted and greatest T41 boards and kits along with everything else I sell there. Plus we will be advertising the

All: Al and I have just updated the 3rdedition T41 book. We moved the calibration info from Appendix C toits own chapter (20). The expanded instructions and new software makeT41 calibration much

That would be me. Ill be home late tonight. Tell me what you are looking for exactly. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch –

I am interested in purchasing the latest V12 blank pc boards for the T41-EP SDT.? Can anyone point me in the right direction to purchase these? Thanks

On Wed, Apr 2, 2025 at 07:48 AM, K9HZ wrote: Dr. Bill Playing with compensation caps around 180-220 flattens out from 3-30Mhz I can't seem to get much gain past 35-40Mhz Still playing not that

That was an instant fix! Thanks Rick. Roger G8JWT

Roger. Try a 180 deg flip of the 3 pin connector going from the audio top hat to the teensy 3 pin connector. Worked on V11 should also work on V12. No guarantees but easy to try. Rick, KN4AIE Sent:

I'm in the middle of doing the TX calibration using 66.9. On receive the radio works with the indicated sideband just fine, but when I switch to transmit the sideband is reversed. In other words when

Thanks Oliver. On to SSB Cal tomorrow. Almost done! dave

Very nice, Greg! Jack, W8TEE

Demo of the new AGC in T41EEE.9: https://drive.google.com/file/d/1kgLZ_y-1xVc4QN0M9kNv9v5RzguR9nW1/view?usp=sharing Compressor2 is part of the Open Audio Library.? Bob's Tiny Ten Transceiver uses it

Hi Oliver, you're generally right, but missing one important detail.? The harmonic copies coming out of the QSE circuitry will mix with the fundamental in the power amplifier and produce

Yeah exactly right… everyone is use to having a BPF in transmit to clean up the signal before transmitting…. But what many SDRs are missing is a preselector… a band filter mechanism in receive

Bill can comment further, but the BPF should be in the signal path in both RX and TX mode. In TX mode it cleans up the signal before it goes to the PA. This means that higher-order harmonics of the

That's right Dave -- you null the lower image if you're in a USB band, and vice versa

Well, I did some more troubleshooting and this is what I found: I stuck some troubleshooting code at the beginning (first line) of loop().? Draw a line on the display.? Well, looked like setup never

Yeah you can short C14 and C16 but C15 needs to be a 0.1uf… I’ll fix that on the Carrier board for the PIN DIODE TR switch… Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ

When doing the TX IQ calibration of the higher bands that use USB, do you null the lower image? dave, n3ds

I solved my oscillation problem.? I did not populate the 1.8MHz HPF.? I placed shorts across the capacitors forgetting that the MASWSS0179TR RF Switch needs DC blocks.? I now have >65 dB isolation

Not at this time Tim