FT-817 External Keypad - Demo

[Adriano9966]

Paolo sei troppo forte hai avuto un colpo di genio quando hai inventato questa tastiera esterna.ho appena comprato questa piccola ricetrasmetente per il mio mobile il tuo keypad mi sembra un ottima soluzione/alternativo

cordialita dall'Inghilterra saluti de Adrian 2E0TEN 73

[ik1zyw]

@Adriano9966 Thank you Adrian for your visit and your words. The keypad has evolved since the video was filmed. For mobile use the external display (AKA "Frequency Reader") could be more practical, or the soon-to-be-released version which includes a tuning knob. Stay tuned for new video(s) :-)

[iBl0b]

Hi !

I connected an Arduino to my FT-817, but I have a lot of QRMs (with small internal antenna). QRM comes when I connect the ground between Arduino and 817. It's the same with a USB-to-TTL serial adapter on my computer. Do you have the same problem ?

My idea is to use optoisolators, which works great, but I need additional power supply or battery for the Arduino.

Did you find any solution, like capacitors on power supply from the Yaesu, or coil on the wires ?

Thanks !

Frederic

[ik1zyw]

@iBl0b The keypad does not use Arduino, it uses a dedicated circuit built around an Atmel AVR processor. The keypad is self-powered from the 817, so there are no ground-loop problems. Moreover the keypad clock has been chosen to minimize interference into HAM bands.

The internal antenna is certainly picking up noise. Only if the noise is present without antenna then you should go step by step into isolating data/ground paths.

I do not own Arduino, I cannot try to reproduce your problem.

[G0IFI]

@iBl0b Ferrite rings, or rods, help a lot with USB to serial adapter QRM getting into the 817. Wrap as many turns as you can of the connector cable around some ferrite and see if it improves. Small capacitors > 47 pF and < 1nF between each conductor in the cable and the shield might help too.

@ik1zyw This external keyboard is excellent, very clever. Congratulations.

[goathiker]

Bravo! Very very clever OB!

Ciao & 73 Peanut

[YY2JE]

hello you have some web where the can see the details of as I manufacture it? 73's

[strncl]

Non ne capisco l'utilità... la keyboard è più grande della radio...

Uso a casa? Hai mai attaccato l'817 ad una antenna seria?

mmmm...

[ik1zyw]

La keypad che si vede nel video e' la board di sviluppo, che peraltro serve a mostrare l'esiguo numero di componenti. Le dimensioni si possono ridurre a quelle del solo tastierino.

Uso a casa? A casa, in auto, in portatile, dove se ne sente il bisogno. Se qualcuno vende prodotti inferiori a 80+ Euro, qualche utilizzatore ci sara'.

Cosa e' una "antenna seria"? Conosco dipoli, yagi, long wire, ..., non "serie". :-)

Ciao.

[g0tmx]

Very nice little homebrew project.. did you design it yourself?

[ik1zyw]

Yes, I did all the hardware design and software development. Hardware is very simple, but software is all own work. A nice way to keep me busy at night for 3 months...

[OH2FFY]

I dont own a 817 , but that sure does look like a handy bit of gear.

I am sure you could market that as a little kit.

Regards

gregW:-) OH2FFY

**See my Ham Radio Videos on YouTube**

[VictoreCelia]

very good job... 73