SM7UZY

The repeater built



Me and my friends got our hands on a Yaesu DR-1DE.
First test.. well it worked, but i could be better. The DR-1DE is a quiet poor build repeater, but hey! It’s cheap!



To use the repeater with Wires-X you need newest firmware.. I had he old one, so time for an update to the newest 1.10Q



This repeater don’t like voltes over 12.8V, and not under as well. Many had problem with it, so I adjust my power supply to 12.8V. I took a good high quality HP server power supply that can give 62A and 12V. Some adjustment and then 12.8V. You need a good power supply with good filters inside. Also, a power supply that can handle the current. This one drop 0.02V between RX and TX under a extremely short time under full load, you don’t even notes it. That’s important.



One of the first thing I did was to remove the speaker and put in a extra fan with a loot of power. There is a filter in front of the speaker that you have to remove if you want a fan for a much better airflow. I also put a 40mm fan on both the TX and RX. Yaesu did not provide these.




Another thing I want to see is the temperature. So I took some DS18B20 sensors and a Arduino Uno and put one sensor inside the RX radio, one inside the amplifier (between the heat sink and the circuit board), one between the two heat sinks on the TX radio, one outside the repeater. I also got a sensor for the humidity.



I had some problem with the filters and discovered that the cables was not 100%. So I did some new once and then, everything worked.




The repeater drop the TX directly then the RX is over. I don’t like that! So I took another Arduino, programmed it so it hold the TX for six seconds. I also made a small roger beep after every TX so you hear when the other person is finished.

The PTT control is made with only one cable, the USB-like on the front of the RX radio to the ACC connector back of the TX radio. To grab the PTT and audio input (also in the same cable) you can make a new cable (not) or very gently cut the plastic around the cable and look for the yellow and the red wires. The yellow is PTT and have 3.3V in RX that shorts in TX, so you can’t just take that 3.3 to the Arduino as a PTT. You have to invert the signal so you have a high and low signals. But.. you can’t just connect the Arduino, you have to put the Arduino in the middle of the yellow wire, then short anoter output on the Arduino that you feed the the TX radio with. The next picture is the finished result.




This is box is one of the brains of the whole repeater. Inside you find a APU, a Raspberry, some electronics and a switch.
The next picture is the Wires-X computer and the install off everything.




This is how the repeater box look like. To the left, out of the box, to the right with all modifications.
To the repeater you have the Wires-X computer and the controller. With the controller I can adjust the repeater, start/stop futures, see temperature, restart things etc. and the controller is design that the repeater can run without it (if it breaks).


Everything started with an Yaesu DR-1DE.
Here is the whole repeater before the installation on it’s location.