Quick hack with an LM-386 for an audio amplifier I needed for one
of our rooms.
Signals looked nice and clean on the scope and sound is sufficient for it’s
Took some time tonight to re-build my FSK interface for the TS-2000 and
add CW keying for the upcoming ARRL DX CW contest. Looks much nicer
now. Schematics are here: http://www.aa5au.com/rtty/fsk-interface
Also had to made a pig tail to get all the signals out separately to be
able to use it with multiple radios.
Update 4/8/2016: Code is now on GitHub https://github.com/michaelschulz/rotorduino
I finally found some time to post the source for my rotor controller I posted about a long time ago. Maybe some day I will also find time to make the schematic. I never drew schematics in a proper tool other than on a piece of paper. It should however be somewhat self explanatory. As the saying goes:”The documentation is in the source” :).
I wrote about the process here before. Next up the 1st IF tap to hook up an RTL-SDR.
And everything should be running fine now as I just moved this blog
over to Azure from AWS. Looking forward to better features and more
My recently newly acquired TS-850 is a great radio. But what’s even more,
it comes with the proper serial ICs built in to hook it up to a PC for CAT
control. There are various ready made cables available on eBay to accomplish
this, but I really can’t get myself to spend $40 on a cable which can be built
for a lot less.
The serial connection on the back of the TS-850 (ACC2) provides inverted
TTL level signals. So all that is needed is a inverter and then a TTL to RS-232
conversion. At first I built the following circuit which I found here:
This is a straight forward circuit using the 74LS04 to invert the TTL signals
and then the good old MAX232 for TTL to RS-232. One could leave it at that
and use a USB-serial dongle to connect to the PC.
I went a step further and simply feeding the signals from the hex gate (74LS04)
into a FTDI USB interface. Total cost in parts ~ $15 and the satisfaction of
having built it yourself . Adafruit has a USB to TTL cable for just $9.95 which
would also work. I just had the other interface already on hand.
This is what my fancy design looks like:
One thing to note is that I did not use RTS/CTS which for some reason did not work.