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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

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 _._ [email protected]> wrote:

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

I like the idea of the resistor matrix. I might have copied it if I hadn't gone a different way already. This little board from Sparkfun can do up to an 8x8 matrix, has debounce built in, uses I2C,

Hi Akira san, I guess you mean 75 MHz (not kHz)? In that case it could be a harmonic of 25 MHz (not kHz). Perhaps it comes from the 25 MHz crystal in the Raduino? 73 Allard PE1NWL

Hi, ? I have looked at this but have not yet tried them: https://hambuilder.com/

Rowland, Does it go away when you unplug the power to the PA? -Don

Oh yeah,? forgot to mention that I put the orange and purple leads back in the original position on the mic jack as well.

I just wanted to update this post so that another noob isn't lead astray. I've finally got my dummy load put together so that I could more thoroughly test the mic and transceiver and it turns out that

Based on Rowland's results it appears that we are left with trying ferrite beads on the volume control to AGC wires or muting the speaker. Since my ICOM wired hand Mic PTT switch is SPDT with the

Jerry Thanks for the info. I did a quick scan of the relevant pages. I can see several possible uses for this device. Maybe I missed something but it seems that like almost all I2C devices it is a

Suggestion:? It's a good idea for us to keep lab/project notes and info in a spiral-bound notebook.? Then we have everything we need and in chronological order.? Tape in program code, which we

Here's a datasheet? (sort of, you don't get the pdf):?https://pdf1.alldatasheet.com/datasheet-pdf/view/810501/TONTEK/TTP229.html Bottom of page 8, section 3-4 describes the 2 wire interface, though

Jon Thanks 73 Art

Michael Link below is for xloader for MAC http://paulkaplan.me/HexUploader/ 73 Art N2AJO