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

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 should

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

Relay K1 caused problems here, so I removed it and replaced it with a DPDT switch. I also added LEDs to the TX and RX signals to indicate the transceiver mode. I like this arrangement better than a

Bob GM4CID Okay. Thanks for the heads-up. I might have some day proceeded blindly thinking that this was an I2C or TWI data bus. Guess that is another reason why I am going ahead with my existing

Jerry I'm still sticking with my resistor matrix on an ADC port, mostly because I already have the keypads and this effort is for my own use. When it is finished (if it gets finished) someone else

Jerry, Sorry for the poor picture, that is the correct part number though. These relays have the exact same specifications and pin out as the original one's Farhan used. There is nothing really

Hi, Art. The Raduino board provides a T/R signal that operates a relay (bottom-left on the schematic). This relay switches power to the RX or TX circuits. I suggest you use a highlighter to mark TX

Arv, The TTP229 capacitive keyboard has two pins labelled SCL and SDO but unfortunately they are not I2C. The way that they work is SCL is clocked frequently up to 16 times and during each clock

Could work. Though scanning a keypad with i2c will consume a lot more processor time than just reading some IO pins.

The Bitx40 and uBitx use relays with a 12v coil, there are some very similar relays out there with 5v coils that would not be suitable. The relay that hfsignals has been using is harder to find,