RunScribe – Wednesday Morning Signal Boost Escapade

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Runscribe aluminium strips


My ANT+ signal-boosting kit arrived the other day. This morning I got out my toolkit (aka scissors) to install it.

There are well-known problems with the Fenix 5/5s (example: garmin forums, 44,000 views ). Dropped connectivity appears to happen with Garmin sensors as well as non-Garmin ANT+ sensors. Clearly it’s not Garmin’s fault and small companies like RunScribe should pay for resolving the problem. Errrrrr.

That’s what RunScribe seem to be doing with the apparently ingenious signal-boosting kit. You just cut a 40×3.5mm section of self-adhering aluminium strip and stick it to the side of the RunScribe pod. Thank you Tim & Co at RunScribe.

Definitely one of my easier jobs.

My last DIY escapade was changing and shortening a Shimano bike chain with the wrong tools which took over 45 minutes…40 minutes longer than this job.

“Will it work?” … I’ve no idea. I guess it’s been tested. All I can say is that the later run showed no apparent dropouts with the 235…not sure there were any dropouts bfore tho to be fair.

Runscribe plus Metric power beta

“If I stick a strip on my STAGES aluminium crank that also has reduced ANT+ connectivity will that work?” …. err NO. I doubt it very much.

I discussed the UNliklihood of a FEnix 5/5S recall here.

My moral compass doesn’t always mesh with everyone else’s but this situation looks clearly wrong to me. My solution is to repeatedly moan about it until nothing gets done.Β  πŸ™

RunScribe Plus – A Few Pictures, Review to follow LATER


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What I want to try… sticking it on a Stryd to see if that resolves issues on the Fenix 5/5S…


Yeah, my thinking was basically along the ‘seam’ edges, in essentially a similar installation design. It won’t look as pretty, but that’s OK. With a WASP I can measure RSSI pretty easily (roughly), so is simple enough to see if it changes.

My bits of foil arrive Friday, so will try it out then. I tried finding said foil locally, but no luck.

At the same time, someone noted that the most recent Fenix 5 beta software + the ANT stack update has some specific items that may benefit Stryd. Garmin hasn’t confirmed that to me though, but rather a reader saying it. I haven’t got it all installed though.


Runscribe will also allow you to change the update frequency of the ANT+ signal in the GC app – so worth playing with this too to see whats optimal.
I am not an RF engineer, but assume that the innards must already be formed in a way that the foil can boost what’s already there. I have not opened up any of my RS pods, but I assume the antenna construction must wrap around the side where the foil is placed. I have no idea where the antenna is in the Stryd, but I think you’d have to pretty lucky for the same thing to help there too.
(feeling smug, having gone for the 935 instead!)


Yes – I think its just throwing the data at you more often, but with the same power levels.


In general, but also depends on what objects are in the way as different frequencies can penetrate better then others. But the range frequencies Ant+/BLE run in is too small for impact there


Where depends on the antenna location. This either acts as a reflector to make the signal more directional or as a ground plane as they may not have that on their PCB.


I find it incredibly disappointing from Garmin that Ant+ doesn’t mean things work together (eg. Stages and 920XT). They blame others but it’s basically the standard that’s at fault. And Garmin own the standard!


Has nothing to do with the standard. Antenna design is hard: