Newsflash

News

 

The Power Amplifier module was replaced by Steve G0LCG and normal service has been restored this afternoon

Thanks Steve 9/3/11

 

GB3IN has a Transmitter fault we hope to resolve soon 9/3/11

 

 

Repeater receiver has been replaced and normal service resumed 29/12/10

 

 

GB3IN has receiver failure hope to rectify very soon  28/12/10

 

 

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Intermitant Fault -Update

Hello All,
The new Antenna has now been installed 26/11/2010 AM and seems to be working very well.......reports welcome........our Thanks go to Richard G1SLE & Phil G6YAL for their time & effort in the bitter cold weather for the installation Many Thanks

Regards The GB3IN Repeater Team

We have a fault on the repeater which is caused by a faulty antenna the repeater has now been returned to service on a temporary fix basis with the addition of an extra filter ....it is currently working ok most of the time

The fault condition causes a major problem to the duplexer and hence the receiver so in both modes

Please keep this in mind ....you may find it ok at times and not at others it is intermitant and I have done all that can be done for the time being

We have a new replacement antenna on order and hope to get this fitted at the next scheduled work on the tower.

GB3IN Repeater Team

If you have any specific questions please feel free to email me directly        g4tsn@g4tsn.co.uk
Home Repeater Hardware

Repeater Hardware

GB3IN Radio Hardware

The repeater is based on the reliable commercial Tait 300 series. This Consists of 7 modules in a 19inch frame left to right.


  1. Monitor Speaker
  2. Repeat Logic
  3. Tait T375 Receiver
  4. Tait T377 Transmitter drive unit
  5. Tait T377 50 Watt PA
  6. Spare
  7. Power Panel

The central section in the rack houses the keyboard the 12v Psu a 4 section Band Pass filter and a mutek preamp for the receiver.

The Bottom of the rack houses a Compaq Rack mount Intel Computer.

Note: Repeater Logic (G1SLE Design) modified and built by G0LBW & G4TSN during build of GB3RR 6m Repeater.

 

Duplexer

4 x Sinclair FP20110 Modified to Series Loop

GB3IN Duplexer

The series loop method was chosen for its much simpler adjustment also a Ferrite Isolator on the transmitter as this site has many transmitters.

Update 2005: Replacing Series Loops with Silver plated tube rather than copper strip has increased notch depth allowing the use of 4 cavities.

 

  • Transmitter Tait 300 series T375
  • Receiver Tait 300 series T377
  • Mutek RX  Pre amp
  • Duplexer Sinclair 4 x 10 inch Cavities    BpBr Configuration 2 Tx leg 2 Rx leg 
    (now less than 1.5dB loss)
  • Feeder Andrew LDF 4-50 Heliax
  • Aerial Folded Dipole
  • Logic G1SLE design based on 80C31 Microcontroller with external eprom
  • Computer Compaq Rack Mount Intel PC Windows XP professional
  • Interface WB2REM Board
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Last Updated on Sunday, 28 March 2010 22:44