Key S100 Variometer Settings -

[Mark Morgan]

Hello all - would like to compare my key S100 variometer settings to others who feel they have their variometer working well. 

Vario Parameters

Needle Filter (sec) - 2.0
Sound Filter (sec) - 2.0
Netto Filter (sec) - 4.0
Relative Filter (sec) - 4.0
SC Filter (sec) - 4.0

TE Compensation - 0 (I am setup for pneumatic comp with using the TE probe)

Graphics Parameters

Vario Needle - Relative
SC Needle - Relative

Sound Parameters

Sound Shape - Harmonic
Vario Audio Mode - Digital Pos Only
SC Audio Mode - Relative
Dead Band (kts) - 2.1

By no means do I consider my settings optimized.  Curious to see how others are set up.  Paul Remde was kind enough to send me his settings which are a little different than above.  I will be testing my setup with Paul's setting soon.  

Also on my pneumatic compensation, my TE line is split just before the S100 and one line is feeding a Winter mechanical vario.  Some skilled glider pilots have shared that is a bad idea, since as mechanical vario creates "noise" in the TE line that causes some confusion for the S100.  Would love to hear comments about this as well.  

If I get a good response to this email - I will put a comparison table together and share.  

Thanks, 

Mark Morgan

WK

[christopher behm]

I'm interested in participating, but my glider is 130 miles away and not sure when I'll get to the S100.

I'll try to remember to check my settings when I fly next though. 

I think that my Winter vario also short splits the feed from my TE probe, but I'll have to look also. 

Along that topic, is there an agreed upon length that should be used between the split and the two varios?

My canopy and panel front hinge, and I'm hesitant to try to add another line through the pivot unless I'm going to be doing something there in the future anyway. 

If someone knows about that length, please advise. 

My S100 seems to work good enough for me, although I'm no expert!

Kind regards 

Chris Behm

N304DD

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From: lxnav-us...@googlegroups.com <lxnav-us...@googlegroups.com> on behalf of Mark Morgan <avnm...@gmail.com>
Sent: Sunday, October 5, 2025 1:18:36 PM
To: LXNav Soaring Glider Equipment User Discussion Group <lxnav-us...@googlegroups.com>
Subject: [LXNAV-user-group] Key S100 Variometer Settings -

 

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[Ludovic Launer]

Hi

Needle Filter: 3.0

Sound filter: 2.0

Hawk Wind variance: 0.05

Hawk avg. hor.: 30.0

hawk Wind avg. ver.: 20.0

SC tab: 0.5

Integrator: 20

Auto SC: Off

Smart vario filter: 1

Netto Filter: 3.0

SC Filter: 3.0

Relative Filter:3.0

Graphics:

Vario needle: Vario

SC needle: Relativ

Sounds:

Linear positive

Also on my pneumatic compensation, my TE line is split just before the S100 and one line is feeding a Winter mechanical vario.  Some skilled glider pilots have shared that is a bad idea, since as mechanical vario creates "noise" in the TE line that causes some confusion for the S100.  Would love to hear comments about this as well.  

Never heard of that...and I don't really understand why that would be the case. Curious to hear some explanation on why that would be the case.

 Regards

Ludovic

[Tom Dukerich]

Here are my differences only.  It has been a long time since I set it up and I do not recall how my settings were chosen:

Vario Parameters

Sound Filter (sec) - 1.7
SC Filter (sec) - 2.0

Graphics Parameters

Vario Needle - Vario

Sound Parameters

Sound Shape - Sinus
Vario Audio Mode - Linear Positive
SC Audio Mode - SC Mixed

[jpg...@gmail.com]

If the electronic vario uses pneumatic TE then don't T-piece the TE tube to both that and a mechanical vario close to the instruments.   Avoid it or mitigate it by dividing the TE pneumatics as far aft as possible - or use electronic TE.  A mechanical variometer uses a capacity flask to measure the rate of pressure change. An electronic variometer uses a pressure transducer with a much smaller volume.  Close connecting these two very different systems will cause pneumatic flow between the instruments and pressure interference.