Archive for the ‘ Repeater ’ Category

First prototype for the diversity system

The last week has been a lot of fun. I’ve finally “released” the first part of the diversity systems firmware and also built a prototype PCB for testing. This board controls the receiver and will be placed in each receiver in the system, a vital part that must work before anything else can be tested correctly.

While testing the board I realized that one of my filter designs didn’t work out as expected but I’ll look into that this weekend. This is just one part of the whole system but still fun to see that I’m making some progress after such a long  time.

For all of my firmwares in this system I’ve built a CLI (command line interface) to control all the AVR processors via the computer (usb). This makes everything so easy as I can make all calibrations and debugging etc. directly from the computer.

2013
04/19
CATEGORY
Electronics
Repeater
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Repeater voting system and CAT interface

This weekend I finally got some time over for the repeater voting system (diversity). The receiver part is more or less done and the calibration with the receiver itself works really good. I connected the whole link with receiver, link transmitter, link receiver and then the voting interface. Both the link transmitter and link receiver has to pass the noise at 5-7KHz so a modification is necessary, you can find that modification under the “Project” page . Just before I was going to try it out my link receiver started to smell like something had burned. I quickly disconnected everything and found that I accidentally had shorten the 13.8v and ground. Fortunately, after the disassemble of the radio, only a track on the PCB had burned off. So after the repair all was working fine again.

To be continued..

I also made a simple CAT interface for Yaesu FT1000MKV as I wanted to control the radio via contest software such as HamRadioDelux and N1MM. The manual says that you have to use a cross over cable but I found out that it has to be a straight cable if it’s connected directly to the computer!

2013
03/11
CATEGORY
Electronics
Repeater
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Progress on the repeater voting system

This weekend I finally tried my arduino projects on real equipment and the results were really good! It still needs some calibrations and tweeks here and there but the future looks good.

I had a spare Radiosystem RS901 to use as a reference unit for the measurements. The 900MHz version is completely useless otherwise so this made me happy, it has a purpose again.

2012
10/21
CATEGORY
Electronics
Radio
Repeater
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Programming weekend!

Have been programming all weekend and I’ve succeeded with stuff I never thought I would be able to do, maybe I’m starting to transform into a programming nerd? As always, I am working on my repeater project and both parts of the voting system is making huge progress!

2012
10/14
CATEGORY
Electronics
Repeater
Work weekend
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IARU HF Championship and some cables

I’ve been very busy lately and haven’t had the time to take pictures or write something on the blog.

Yesterday I prepared some cables for the new repeater antennas. I’ve mounted 2 new antennas, the same as before Aerial OY AV1914H. I am redoing the antenna farm and mounted 2 antennas on each side of the tower for RX and 1 of the antennas in the top for TX. The problem is the cables that’s going up in the tower, they are heavy but I hope to get some help with this.

Other than that I’ve been running IARU HF Championship from SK0UX with the callsign SK9HQ, more of that here http://sk0yt.blogspot.se/.

2012
07/18
CATEGORY
Contest
Repeater
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