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Hi erry, My comments were in a completely different universe :) I assumed being posted here it was something it is not. While we all know about "assume" it isn't unreasonavle to expect questions

I looked at your project and see you're using the adafruit si5351 board. There was an issue some time ago and recalling from a hazy memory it had something to do with crystal loading and the si5351

I have no sophisticated bench test gear so I used my hackRF and the free Spectrum Analyzer software to 'look' at what my uBitx was transmitting whilst on FT8 on 7.074MHz and the result is quite

The etherkit library is totally different than the si5351bx routines used on the uBitx. So my discussion of the correction factor may or may not pertain. Good luck.

Hi Bill. True at the moment. I'm actually using a Mega2560 to control the Si5351 board with a 3.5" TFT LCD interface. The software is based on the VU2SPF and VE1BWV sketch, with the appropriate

Hi Jerry. I have not as well, but I wanted to check to see if my symptoms jogged anyone's memory. :-) I'm not sure if it is; I haven't actually checked. The sketch I'm using to test the Si5351 is in

Hi Jerry, When I replied with a suggestion he told me he is not using a Bitx40 nor uBitx nor a raduino nor any of the Bitx or uBitx software. -shrug- 73, Bill KU8H -- bark less - wag more

I have not heard of others in the forum voice concern about the si5351 calibration changing.? Unless you are using different firmware or there is an error in the firmware, that sounds like the 25mhz

Hello everyone! Today I played a little with my Ubitx, I made a lot of contacts all over Europe. After a while I decided to listen myself on a SDR located somewhere in Norway because I wanted to play

Hi Mark. None. The calibration sketch is here: https://github.com/etherkit/Si5351Arduino/tree/master/examples/si5351_calibration This sketch simply programs the Si5351 as an oscillator, no USB, LSB,

Sorry for the above message. The audio is there its just very low. I should have checked the info on the web site re this problem. and? Shall? have to get an amplifier to boost the audio A Redface

Correction: After seeing your results I feel the stage is OK for upto -5 dbm input output where as the actual input is -30 to -40 dbm. The output of the stage is max -10 dbm and so the input will be

Thats a given. The stage becomes a high impedance input. Try a 470 Ohms parallel with input to compensate the resistors removed. We did discuss the notch but I have not tried. After seeing your

Glenn, pleas keep in mind to check the output of Your signal generator, mostly the ahrmonics are in the same range i.e. about -30 dBc to the main cyarrier. So to make sure You do not make false

Dear Raj, No heat in the final Audio Transistor , It is cool including my self Thanks & regards sudanthiram vu2nsk

Thank-you for the reply. I did try wrapping the 5 v lead through a toroid I had, though at 300 hz, even if a square wave, I would not expect much attenuation. I will try a larger inductance.

Raj The input VSWR with that mod increased the input VSWR to around 7:1.? (measured 0-30MHz, my current setup) I didn't check before the mod but assume its closer to 1:1. glenn

Not much change really Raj, I used 39k. At -10dBm input, there is a slight improvement by maybe 2-3dB At -20 & -30dBm in, virtually same result. I wonder if a notch could be added for the 2nd

Ashar, I always had a lot of doubts that the first mixer should be the culprit but suspected taht the first BiDi amp must be the reason in producing harmonics. But now You and Raj confirmed my

Sundar, It should be best sound around half. Just check if final audio tr's are too hot! Raj