Latest Site Pictures

Antenna System:

  • Transmit Antenna: “PE1RKI” Slotted Waveguide, tuned for 3404MHz
  • Rx Antennas: “WIMO” PA23R x 2 with diversity reception, Horizontal Polarisation One facing NE (for Essex) and one facing West for the Bromley & Croydon area
  • Feeders: Andrew LDF4-50
  • In 2020 we plan to include a 70 cm input as well
IMG_3612

GB3JV Antenna System

Transmitter:

  • Minimod 2TS (dual Transport Stream)
  • 3.4GHz up-converter
  • H264 Encoder
  • Dual input Mux, selects between receivers/antenna
  • Dual diversity Wideband receiver (2 x TS output)
  • Raspberry Pi 3+ Streamer
  • Planned: Intel NUC i5 for Media Player
  • Dual Programme 1 x HD Channel and 1 x SD Channel 4MS/s 8PSK FEC 3/4
  • Amplifier: Stealth Microwave SM3437 WiMax Linear Amplifier 20W Class-A
IMG_3614

GB3JV System Rack before Installation of Tx and Amplifier

Networking and remote control:

  • Cisco Meraki Z1 VPN Firewall/Router
  • Huawei E3373 LTE Modem
  • Network Carrier “SMARTY” Virtual Network Operator on Hutchinson 3G Ltd.
fullsizeoutput_133e

The JB3JV Network Link: a Cisco Meraki Z1 Firewall/Router and Huawei E3372 LTE Modem

Testing the BATC streamer – BATC “Portsdown” software running on a Raspberry Pi 3+ and the site network equipment.
A “Stealth” Wi-Max Class “A” Microwave Power Amplifier re-purposed for Digital Amateur Television. To the right you see a pair of MeanWell switch-mode power supplies, the larger one for the Power Amplifier and the smaller one for the Drive equipment.
The repeater’s control dashboard as displayed on an iPhone. The telemetry is based on the ModBus RTU protocol (over TCP). Dashboard software is based on Home Assistant (HASS.IO) Open Source software and configured using yaml. Apart from monitoring the repeaters health, it also allows instant shut-down in the event of an OFCOM request.
The LTE Modem mounted in an ABS case for mechanical and protection from dust etc.