7300 Remote Control

-





 I want to use remote control with my 7300. This is more an experiment than an actual plan to use my 7300 from a remote location. What I am thinking is that I will use the 7300 remote control port along with a separate audio connection so I don’t have to play with virtual devices to connect the audio for digital modes. Not sure how this will work yet. It’s possible that it is not possible to do this.

This is the device I want to build. A USB to Serial adapter that connects to the remote control port of the 7300. The remote control port uses a 3.5mm audio connector with the TIP going to UART TX and RX pins and the ground connecting to the UART GND pin. The TX and RX pins are pulled high through a 10K resistor connected to 5 volts. The TIP is connected directly to the RX pin and to the TX pin via a 1n4148 diode.


The first step is to unlink the CV-I remote port from the USB data port. Second step is to build a remote control cable serial cable. I happen to have a cable with a 3.5mm stereo plug on the end that I will use for cabling. I also already have a couple of USB to UART dongles that use silicon labs chips. I will build the interface using a 6 pin DuPont header. I found this diagram on the internet from Larry WT6M that uses an FTDI chip, but it is fairly standard stuff.


Here is the DuPont header with the diode and resistor connected to the header pins. I also include the tip and gnd connections from the cable.



The ring wire (red) is left unconnected. The header attaches to the USB to UART as follows:


I tested the cable with WSJT-X installed on my mini PC (see previous blog). The dongle appears as com port COM7 and works with WSJT-X cat control. I don’t have any audio set up so I can only view the rig status and change the settings.



I already installed WFView and it appears to work with the new cable.

Next step is to bring audio from the rig. I am thinking about getting to from the ACC connector if possible.


Comments

Post a Comment

Popular posts from this blog

-
Image
 I’ve started looking into battery charger repairs for some of my baofeng chargers. I tried to buy a charger for my DM 1801 DMR radio, but the ones they shipped me did not work. They would charge, but were unable to detect when the battery level falls. A working charger using the hc5812 chip will flash quickly between red and green. A defective charger flashes slowly. The hc5812 looks similar to a tp4056, only it handles 8 volts, enough to charge two cells providing 7.4 volts. The newer chargers use a HXN-TWS chip that is very similar to an sc6038. I am currently breadboarding a charger so I needed to get the HXN-TWS onto a breadboard. As it is a SMD chip, I bought 10 adapter chips for .89 from AliExpress.  This is the end result. I use 60/40 solder for the mounting pins and 138°C solder paste for the SMD. I have had good luck with this technique and use a hot air station at 180°C to solder the SMD. Shown is a completed chip, a blank adapter board, an SMD chip, and the 2.54mm breadboar
Read more

CQRlog sharing

-
Image
 I use CQRLOG for my logging program. When I first started back on ham-radio I was using Linux for everything. CQRLOG was the perfect solution because of its low price and high functionality. Eventually I move to Windows 11 and started running CQRLOG in WSL. The challenge now is that I have multiple computers and I want them to share logging. The problem with CQRLOG, is that it is monolithic. Not GUI / API architecture. One option is to run a share SQL server, but I don’t know if CQRLOG would operate using a share database. It might make assumptions that nothing will change without the front end knowing about it first. I haven’t looked into this yet, but I plan to get the source and start poking around. I will have more once I do this. Meanwhile, I am setting up a database running on windows and will try to point CQRLOG at the database.
Read more
-
Image
I have a couple of computers that I use for various purposes. One is my general computer for office and financial work. The others are various laptops that I either bought or acquired. Almost all my computers, including the ones for my wife and daughter, have i7 processors. My argument is that more CPU power means the likelihood of extending the lifetime of the computer. The computer below changed my thinking. I have a Dell Inspiron 1545 that I bought my mother in-law in 2010 or so. It has 3 GB of memory and a 128GB disc drive and an icore duo processor. I use it for packet radio running direwolf and BPQ32. I also have wine and VARA installed. Its amazing how well it works. After the last lubuntu upgrade, the express card with two USB 3.0 ports stopped working, or so I thought. I quickly looked around for a replacement focusing on the low end of the market. I ordered the PC below, a super compact N100 12th generation processor. With 512 GB disc and 16 GB of DDR4 memory from AliExpress
Read more