Tag Archives: Arduino

Yaesu DR-1X Repeater MultiMode Operation

Yaesu DR-1X Repeater MultiMode Operation.

The Yaesu DR-1X Repeater can be easily used for D-Star or DMR if you connect an MMDVM board to the rear accessories connector.

The Weston Repeater Group use four Yaesu DR1X’s as four of our five repeaters, and they work well and have done for years.
One is driven from a Wires-X box and is used as our Fusion repeater, two are in analogue ALLstar mode, one on VHF and one on UHF, but 2 are using MMDVM boards with no problem and run with Raspberry Pi 3’s, operating from Pi-Star SD cards.

Our fifth repeater is our D-Star repeater which uses a Simoco FX-5000.

All five repeaters then share the same antenna, which is nice!

To get the audio in and out of the rear 15w high density accessory socket and by-pass the filtered audio path between the RX and TX you will have to put the repeater into remote mode by grounding the appropriate pin on the accessories 15w rear connector. This is pin 1, which must always remain grounded.
Then make sure to use the CTCSS input pin rather than the audio input pin.
The correct pin is pin 6 ‘TONE IN’

All the pin-outs are in the manual.

I selected wide FM rather than narrow FM on the DR-1X so that the modulation was perfect from the MMDVM board, even though you would have thought that narrow would have been more suitable.

I have been caught out with the ‘remote operation’ selection wire coming off of pin 1 before and it does make everything very confusing because it sort of sounds like the digital signals are going through the repeater and into the MMDVM correctly, but in fact they are never getting to the MMDVM board, they are simply passing internally through the DR1X!
All very annoying when these things catch you out.

Amazon do some really nice break out PCB’s with the 15w connectors on them if you tire of soldering the buckets of the standard connectors.

The most important settings to get right in the Pi-Star configuration is to set the TX and RX invert to 1.

Then you need to realise that the TX deviation is very critical, and wider than you would first imagine on DMR.

I have set our DR1x to wide deviation to get the best modulation, even though you would think that you must use narrow.

We use Pi-Star on our raspberry Pi’s which drive MMDVM boards connected to Arduino’s.

If you are using different boards then you could find that your modulation sense is different to ours, and hence you will need to change the inversion settings.

Make sure that you have grounded pin 1 of the 15w socket on the rear of your repeater to put it into remote mode!

Make sure that as well as grounding pin 1 on the 15w rear socket of the repeater, do not use the AF IN pin 7 for your TX audio into the repeater. You must use pin 6 ‘TONE IN’ as this is the unfiltered audio input.
I hear of people using the AF IN pin all the time, but it will never work properly.

As far as RX audio goes, you obviously do not use the AF OUT pin 9, you must use the DISC OUT pin 8, which is unfiltered audio.

With the repeater set to wide FM rather than narrow FM it will all work perfectly.

On the touch screen of the repeater, you need to set the mode of the TX and RX to FM, rather than auto or digital.

You can force the repeater into this mode without touching the screen by setting pins 11 and 12 to the correct logic levels.

Pin 11 should be set low and pin 12 should set high to force the repeater into FM on TX and RX.

Good luck.

Weston repeater group

If Budweiser made repeater sites this is what they would look like!

If Budweiser made repeater sites this is what they would look like!

This is the Weston repeater groups cabinet July 2016, only one of the Yaesu repeaters is being used for fusion! One is FM only and two are used for MMDVM:

Decibel Products 4 channel hybrid combiner

A Decibel Products 4 channel hybrid combiner is now used to combine all 4 of our UHF repeaters transmitters so only a single antenna is required!

This is a very expensive piece of equipment which we had to import from the USA.

It was well worth the expense as it works so well.

Decibel Products Hybrid Combiner Decibel Products Hybrid Combiner
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Decibel Products Hybrid Combiner Decibel Products Hybrid Combiner
Decibel Products Hybrid Combiner Decibel Products Hybrid Combiner

 

 

Motorola MSF5000 TLE2522 UHF Amplifiers now used on our repeaters

Motorola MSF5000 TLE2522 UHF Amplifiers are now used on our repeaters, because of the massive losses in our 4 channel Decibel Products hybrid combiner which we use to allow all of our 4 UHF repeater to use the same antenna.

In total our Decibel Products hybrid combiner and two TX notch filters put about 10dB of loss into our transmit path.

To get 1w out we need to run 10w and to get 10w out we need to run 100w!

That is why we need big reliable amplifiers which require only 3w of drive to produce 100w.
All of our repeaters have been reprogrammed to run only 3w now which means their PA’s are just ticking over and not even getting warm!

We have also fitted Big 50 Amp ACS758 current sensors to our amplifiers so that our Arduino Mega web server can measure and display the amplifiers performance on a web page.

We have also attached a 7 segment voltmeter display to the green wire in the 6w molex socket so we can see the TX output power forward voltage. This forward voltage is around 8.8v  when the PA is running 100w.
The red wire in the socket is connected to a 100k thermistor mounted on the heatsink to allow you to measure the PA’s temperature. Measure between the red wire and the black wire which is ground.
The brown wire is connected to the 100k thermistor mounted on the dummy load of the circulator.

 

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MMDVM GB7WB

Brandmeister DMR on GB7IT

GB7IT is our DMR repeater which is connected to the Brandmeister network.

We are using a Yaesu DR-1X repeater with an MMDVM KI6ZUM board and TCXO on an Arduino Due plugged into the rear 15w HD connector of the DR-1X.
The MMDVM is run by a tiny Raspberry Pi 3 computer with the KB5RAB image installed.

You can now operate through GB7IT on 439.5125 MHz with a -9 MHz TX shift using DMR.
You listen on 439.5125MHz
You transmit on 430.5125MHz

On DMR use timeslot 2, talkgroup 9 and colour-code 1 to talk to the World via the brandmeister network.
The local chat channel is on TimeSlot 1, TalkGroup 235145, colour-code 1.

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GB3WE Arduino Project

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