Kees, I'm very interested in this too! Please share more if you care too. I have a Kits an parts bridge and am incorporating that + Arduino + 2x8 LCD and a Pi tuner into a portable box for my ubitx...

Any simple cure for the noise burst when you key the mic? There is a burst of noise from the speaker as well as a transmitted noise burst. I see some suggest that the audio preamp Q16 stays active

I do the same thing. Mainly because I figure I won't remember it tomorrow! Vince. -- Michigan VHF Corp. http://www.nobucks.net/ http://www.CDupe.com/

I always work with a lab notebook. Each time something is finished (as a module or rig), i pull out the notebook, draw out the circuit and note the readings and the performance. Then, move on. It is a

here is another si5351 board! https://diankurniawan.wordpress.com/2018/06/25/rtc07s-super-low-cost-si5351-transceiver-controller/ - f

Ty Jon. That's about what I was saying. I'm I retired Broadcast Engineer an never kept a notepad (except hidden) Job security I guess. hi hi Just wanted those that were making mods to know. When some

It shows scanning from 7.029Mhz to 7.049Mhz. That's only a 20khz scan, not 50khz. And certainly not 50khz per division on the screen. The funny thing is that those unknowns are *increasing* in

Your carrier is at 7.029Mhz. Did you have your mode set to CW? If so, you aren't seeing "spurious" mixer products at 75khz, 150khz, and 225khz. They are something else. Since their appear on both

Allison, What is the exact math of the spur? We can swap the two local oscillators around in software. That is, the local oscillator can be injected on the other side. Would that help? - f

I was looking for an easy test. Lifting the brown wire from the power switch sounded like it might be simple but hold off while I try to think of something else. -Don

I don't have a separate power source for the PA - I assume to test this I'll have to cut one of the three wires going to the plug into the PCB? I'll try it Wednesday if it will help with

No photo but that would be K1, the relay that sits over at the left by itself. Underneath you will see one of the contacts is grounded. That's the normally open contact. The next contact down will be

Can anyone specify (photo of location needed) a relay contact that is open on transmit and grounded on receive? 73, Alan N4AYE

Hi Allard san, I am glad I can contact with you on this group too. As Raj san mentioned, unit of the frequency of spurious is KHz. Akira JJ1EPE

MVS Sama, Thank you for your prompt reply. My friend measured the spurious. I will ask my friend to check whether cause of spurious is the power supply. Regard, Akira JJ1EPE

Allard, The pic attached is in 50Khz horizontal display. Raj

Yes they are a conundrum in three ports. However I did explore the path of the TIA amp now working well and terminated it with a 6db pad... no improvement at all. Same for the output to the filter

Arv, Another way to drive a 16 way matrix keyboard is the inexpensive PCF8574 and PCF8574T I2C expander boards. I have a couple of these but not made time to try them out yet. There is however, a lot

n2vdy That 1509 IO system from SparkFun looks interesting. I have saved the data and will keep it in mind for possible future use. Thanks for the info. Arv _._

Tank you Art I download and test for my raduino. Michel