Category Archives: D-Star

GB3WE VHF Repeater now an MMDVM Repeater

Weston repeater group Weston repeater group
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GB3WE VHF Repeater is now an MMDVM Repeater!

You can now use your DMR, D-Star or fusion radio on GB3WE on 145.6875MHz using a -600KHz shift.
GB3WE now offers the same facilities as our 70cm MMDVM repeater GB7WB on 439.4875MHz which has a -9MHz shift.

When using D-Star don’t forget to program GB3WE C and GB3WE G and to use your DTMF keypad to connect to which ever reflector you wish to use. Enter *1C to connect GB3WE to REF001C for example.

If you use a DMR radio, then use TimeSlot 2 TalkGroup 9 ColourCode 2 to talk on the Brandmeister Network.

When using your fusion radio you don’t need any settings, making this the easiest mode to use of them all!

UHF PA Temperatures

Title: UHF PA Temperatures

The temperature graph and dials which you see above were generated using a tiny Arduino Mega micro-controller board with an even smaller ethernet board plugged into it. The thermistors built into our massive UHF Motorola PA’s are read via the Arduino’s many analogue inputs, then the numbers obtained are sent to a phant server in the cloud and finally Google charts are used to plot the results!
We find it useful and interesting when we are not drinking Budweiser! 🙂

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

Another First In The South West: MMDVM on GB7WB

Another First In The South West UK: MMDVM on GB7WB.

GB7WB is now a multi-mode UHF digital repeater, which is another milestone for the group.

It will be interesting to see which local repeater groups follow our lead with MMDVM!  Imitation is always a great form of flattery 🙂

We are using a brand new 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 software is run on a Cyclone miniature Windows 10 PC.

You can now operate through GB7WB on 439.4875 MHz with a -9 MHz shift using D-Star, DMR or fusion.

On DMR use timeslot 2, talkgroup 9 and colour-code 1. This repeater is connected to the brandmeister network.

Use the same settings as before on D-Star and you can connect to REF001C or any of your favourite reflectors.

Use your DTMF keypad, press *1C and you will connect to REF001C

GB7WB will no longer auto connect to REF001C so you need to press these DTMF digits each time that you want to use D-Star on REF001C.

When using fusion, you are connected to reflector 4420, which is also accessible via the Brandmeister DMR Network

Weston repeater group Weston repeater group
MMDVM GB7WB MMDVM GB7WB
MMDVM GB7WB MMDVM GB7WB
MMDVM GB7WB MMDVM GB7WB
MMDVM GB7WB MMDVM GB7WB
MMDVM GB7WB MMDVM GB7WB
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GB3WE 5 GHz Dish & 2.4 GHz Tonna

Join our Yahoo Group today!

Keep up to date and fully informed by joining our Yahoo Group: it-is-wb-we-subscribe@yahoogroups.co.uk

https://uk.groups.yahoo.com/neo/groups/IT-IS-WB-WE/info

 

The only place to find out what is going on with our repeaters is at our Yahoo Group: ‘IT-IS-WB-WE’ so do join today and don’t miss all of the latest news!

 

 

GB3WE 5 GHz Dish & 2.4 GHz Tonna

GB3WE Antennas June 2014

GB3WE Antennas June 2014
5 GHz omni
5 GHz dish
2.4 GHz omni
2.4 GHz Tonna
GB3WB 8 Stack
GB3WE Folded dipole


GB3WE Woodpecker

GB3WE Woodpecker

GB3WE Woodpecker


New Dual Towers Configuration For GB3WB GB3WE & GB7WB

Dual Tower Configuration For GB3WE GB3WB GB7WB

Dual Tower Configuration For GB3WE GB3WB GB7WB

Since our tower was so badly damaged in the high winds we have worked hard to split our three repeaters antennas over our two short masts. GB7WB’s UHF 8-Stack is on our damaged main tower along with GB3WE’s RX VHF folded dipole. A spare 2.4GHz Tonna beam has been fitted as well.
GB3WB’s UHF 4-Stack is on our old turbine tower along with GB3WE’s TX VHF folded dipole. Our main 2.4GHz Tonna beam is also fitted to this tower.

GB7WB 8-Stack back in the air on the remains of our tower

To keep GB7WB on the air we have recovered as much of our damaged tower as possible and fitted its UHF 8-Stack to it.

Also we are using G4KLX’s split repeater software to enable us to use two separate receivers to provide site diversity.
The second receiver is in Worle to provide some additional receive capability.
Jonathan’s software automatically selects the best GMSK data from which ever receiver provides the best bit error rate.
Hopefully this will make up for the low height of the GB7WB 8-Stack.

GB3WB Tower Destroyed In High Winds

On Sunday Morning 29th April 2012 our main tower suffered massive damage in the high winds.
At 5.22 am the lower part of the latice tower folded which caused the whole tower to fall into a nearby tree.
Amazingly not a single antenna or feeder was damaged and even the wind turbine and blades are in perfect working order.

In order to keep all of our repeaters on the air we have moved GB3WE’s folded dipole onto our small wind turbine mast. This mast holds the GB3WB 4-Stack already, so its coverage is unaffected.

To keep GB7WB on air we have had to temporarily fit a colinear to the very short remains of the damaged tower, so it is practically at ground level. Obviously coverage will be well reduced, but at least GB7WB is still on the air.

It was a very big and dangerous job to get the whole tower and turbine out of the tree. But to make the area as safe as possible as quickly as possible we have worked on the site more or less night and day for three days in some terrible weather conditions.

Here are a selection of photos of the damaged tower.