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Greg You are correct very easy to over drive 160-80M. I tried lowering input but 6m really suffered. I changed a lot of caps across input to t3 with lower drive but just could not get 6M close. I

Yep... Jack, W8TEE

Yes the T41 radio was designed as a prototype(e-ing) platform. If you make the base radio better for your desires with your changes, that’s excellent. That’s what it’s about. Dr. William J.

What happened here is a series of rapid prototypes with incremental improvements.? I've got working hardware and software.? Forwards not backwards! -- 73 Greg KF5N

I’m back for a while and working on kits again. I put a very high priority on the new Display Driver board that fixes the T41 display freeze issue and allows a nice long cable to the display. I

Hi Bill. I'm new to the group and wanted to know if it is too late to get a set of boards?? If not, how much are they? 73, K5CA - Duane

Hi Greg, No driver. No change from the original V11? display schematic. I use the HC125 without serial resistors. The display cable is 7 inches without ferrite because never had any problems

So Greg why don’t you go back and read the emails that went between Al, me, you, et al on this subject… instead of trying perform revisionist history. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK

So my T41-2 radio can easily receive a Tiny SA set to the minimum output of -115 dBm.? The signal can be easily heard from the speaker and seen in the spectral display on all bands. It uses the same

Hi Alain, what about the display?? A driver IC, and if so, what? -- 73 Greg KF5N

Ok so it’s not really a V11 radio. Did you measure sensitivity the same way I did? The trouble with this measurement is that we need a standard to compare against. Dr. William J. Schmidt - K9HZ

I just measured a sensitivity of -134dbm on my V11 version,but changed PCB routing, added a motherboard to minimize wiring, added a lot of regulators and decoupling capacitors, for having this result.

I said it’s BELOW -100 db. After that I start measuring the noise from the fluorescent lights in the room and my wife won’t let me turn them off (her glass lab is in there too). I do have a combo

So I think what you are saying is a standard receiver sensitivity measurement which the ARRL calls "MDS" (minimum discernible signal). Receiver sensitivity is specified in dBm, which is decibels

Ken:If you're like me, you order "pairs" of mpu's "just in case"...it's saved my bacon more than once. Anyway, I'm not sure it's worth $10. If I use just the 4.1, I tie up about $65 for backups. If I

TNX Greg. I will try reducing input and do more sweeps. I had 40db attenuation on output. There a lot more gain on lower frequencies for sure, have you tried changing L2? I have 7 turns on it now. Tim

Circuit and sw details on splitting the functions over two processors? Maybe one of the mcu's could be a T4.0 to save some bucks?

First off, you need to have a good calibrated signal generator… calibrated in db (or mv so that you can convert to db) that is either variable output or you have a good/accurate variable attenuator.

Hi Tim- Check out this post I made a while ago with some videos showing sweeps of the amplifier: /g/SoftwareControlledHamRadio/message/31850 You have to be careful with the input

Yeah, that’s what mine looks like too. Glad you found the issue. I’ve sold over 1,000 of those PA semi-kits now and I’ve only had three people have issues since I started selling them. One was a