At leased 7 cm, but I had one off 10 cm, and bring the over lenght between print and the housing.
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A bit small - esp with my eyesight! but hopefully will workā¦nothing to loose as its effectively a dead unit anyhow! 
Will report back once doneā¦ 
Have assumed as shows connected in console it works but doesnt āhearā my nodes as on āwrongā freq. It may need more changes to optimise RF side if ant is wrongly set for 915Mhz vs 868Mhz as well but wont know till I tryā¦
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I would send it back DOA Jeff
Beginning to wish I had doneā¦as its a long holiday weekend I thought I would rush it through tonight but all Iāve done is wreck to pcb as too dark in office & lands & 0Ohm too small and fine! 
ah wellā¦a learning experience.
Now, anyone have a copy of the schematics or ideas for how to use the RF Module bd elsewhere?! 
No worries if you lost the tiny original part: a short length of copper wire is a fine zero ohm resistor.
I was thinking something similar - even a simple solder bridgeā¦problem is there are now no lands to connect the solder to! - just two holes in the solder mask so a right-off unless I can get schematic to find alternate point to bridge. However just working on another post which will shed light on original problem and may be a warning to others with mis-behaving unitsā¦post to follow.
Reanimation? This company does no longer existā¦
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Was absorbed back into Semtech last yearā¦
Was sure I checked units when they arrived and per my post to @Weinke at end of March so looked again at boxes as received.
All 5 show same label - RS part number correct 184-3981 TTIG-868!!!
So looks like a mis-pack vs mis-ship or perhaps mis-labled when booking into RS stock.
Either way will flag to RS next weekā¦and will play merry hell with them.!
Made in Chinaā¦made in Taiwan
My guess is that the resistor is actually not functional, but rather just being used as a machine-installed marker of build version.
Iām also not entirely convinced that a US915 build would fail to start the concentrator with EU833 settings - itās not like the Semtech silicon knows what the surrounding passive components are tuned for. In theory there could be an IO pin read somewhere by software or FPGA code that throws an error, but itās not clear it is that smart.
And even in the unlikely case where the resistor is what is preventing it from trying to work on EU frequencies, just moving that wouldnāt change that all of the RF network are tuned for 915 instead of 868 - those arenāt something you can casually change without a full understanding of the design and a stock of the right parts. So even if it started, at best it would work poorly.
Getting shipped the wrong version is of course a problem; but it may not only be the wrong version, but a defective unit.
Packed in Corby, Northamptonshire! 
the us Version of TTIG automagically will Load US frequency Plans, when starting. So it never can be used in OLD EUROPEā¦ Btw they also sent ME a wrong US Versionā¦
Ok, yesterday morning I voided my warranty. Since pictures of the open patient have been already published, I add only a detail abot where i have put the antenna connector:
ā¦ and the final result.
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what antenna is that ? (guess a 5 Dbi type)
It is one I asked for on this thread time ago. Sold as 5dbi, cheap, but not really 5dbi (behaviour is more like a GPA, in my tests).
5km reached with the new antenna, TTIG indoor at 1st floor.
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RS USA (Allied Electronics & Automation) has begun shipping USA orders. My TTIG ordered 3/13 was mailed last night from Ft. Worth, TX and is scheduled to be delivered tomorrow.
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Is there any source code for the gatewayās firmware on ESP8266 ?
Is it possible to have it connect to anything other than TTNās server ?
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No source available. Hard coded to connect to a server that configures it for TTN at the moment.