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“The math under the hood in the frequency calibration routine doesn't account for the fine tune frequency offset.” I didn’t catch that either… any reason for that. Seems a bit quirky… Dr.

OK, the direct freq entry was the key.? Freq error on 30M and 20M around 4Hz, Which I think is fine. Thanks Oliver Mark KU3O

Hey Oliver, I select the 30M band and tune to 10MHz using the Tune knob.? I select SAM demod and use the Fine Tune to get the freq error down to the lowest value possible.? Then I start the

Are you saying that if you tune to 10 MHz and select SAM demodulation, you measure a frequency offset of 190 Hz? A gotcha with the frequency calibration is that it matters how you tune to 10 MHz --

Hey 'yall, I'm running a V12, 66.9, TCXO.? I've run freq cal and I'm off by 190 hz.? I've hard coded the cal value into si5351.init as well as 0.0.? The 190 hz error shows against my freq standard

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