GB3DX Repeater

Transmitter / Receiver	Tait 800
Frequency	433.300 MHz Out 434.900 MHz in
Output Power	10 Watts
RX Sensitivity	0.2 uV
Antenna	JayBeam Collinear at 10 Mtrs above ground (SWR 1.2 to1)
Access to Link	110.9 Hz CTCSS
Logic	G1SLE Logic Click Here for more info
Duplexers	X Dolphin. RX 60dB 2dB loss & TX 53dB 2db loss
Time Out	Time out is set for 4 Minutes
Computer	P4 - 2 Gig - 256Meg Memory, On Board Sound Card
Internet connection	3 Meg Down and 384 kbps Up
VOIP Interface	Opto Isolated System. Home Brew Click here for Circuits
ASL	15 Mtrs
NOV Issued	27th April 2009
Operation Times	24 Hours
Sysop	John GI4YWT
Email	jvc @ utvinternet.com
Web Site	www.echoireland.com

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GB3DX Workshop

GB3DX Logic

Duplexers (X Dolphin)

Click on picture to enlarge

The logic in use is the G1SLE design

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Donations are always welcome to help with the upkeep and advancement of the Repeater

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The first use of the GB3DX callsign was on a VHF repeater in the West Midlands UK. Originally built and run by Peter G4KQU who moved to Ireland and the repeater was then run by Mark G4LCH until its close down in early 2008. The reallocation of the callsign was granted by RSGB Emerging Technology Co-ordination Committee.

For more information from the RSGB Emerging Technology Co-ordination Committee Click here

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User Guide for using GB3DX

Dolphin UHF Duplexers

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There are Internet Gateways located in Ireland also all over the world now on 2Mtrs, 70Cms and 6Mtrs that any licensed amateur can have access to. Many of the gateways use the EchoLink software. No repeater shift is required, and no access tones are needed. The gateway operates a simple squelch system, which means any signal on the frequency will be accepted. In the future if more internet gateways become operational, and QRM becomes more of a problem, some gateways may have to resort to CTCSS tone squelch.

The gateway is very easy to use. You use it as you would any simplex frequency and call CQ and you will be surprised who might come back to you as there are gateways all over the world. Remember that there can be a delay from the station that you are working and don’t forget to wait for the pips after there over before to transmit.

Not all gateways are on 24 Hrs so check with your local gateway keeper for their operation times.

XMIT_ID allows you to record and catalogue the unique "fingerprint" that is part of every FM radio's transmission. This can be used for transmitter identification.