Roman Vojtech

Let's look to this picture a little bit in details. I made zoom in using Excel and a bit of math should help me to ROUGHLY guess the speed of DS.

1. From graph we can guess average diameter of DS circle. I guessed 35m.
2. Let's say average duration of one circle is 5s.

Bellow are some additional pictures which will help you to get feeling about LoLo.

Above I presented you some possible Lolo applications. Very strong area is in Excel spredsheet using all available tools like approximation, smoothing or even derivation (first derivation of distance by time is speed, hmmm). You don't have to load altimeter only in to your favorite airplain but using small accupack you can use it on bike trip, trekking or even climbing. Enjoy it!

Questions&Answers

Q Does the unit keep its recorded data when power is removed?

A Yes! Until you will clear it from memory using CLEAR Button.

Q Can you change the sample rate without loosing the data? For example, could you do a flight at the 0.1 second rate, then change to the 1.5 second rate and do another flight, and then download the data from both flights at the end?

A Yes! No problem, just sampling rate must be switched over (using jumper) when LOLO is not ON.

Q The information mentions up to 10 ON/OFF blocks. Does this mean you can turn it on/off up to 10 times before downloading the data, and that the data from each 'on' time is downloaded as a seperate file or record in Excel?

A Yes! However there is limit either in 10 ON/OFF blocks or memory capacity, then LOLO stops logging altitude.

Q Does this also mean that you can change the sample rate each time you turn the unit on?

A Yes!

Q What kind of interface on PC do I need ?

A You need RS 232 interface e.g. serial port (also known as mouse port). Every (99.99%) PC has such interface.

Q LOLO LED is just on, no blinking. What does it mean?

A It is sending data to interface port. Depends on size of log this can take more than 60 sec. Always wait until LED starts to blink in sampling rate interval only then it is again recording altitude. If LED goes OFF after this ON status, memory is full and you have to download data to PC.

Q It's possible to adjust the sensibility ? When I use the lolo for measurement on level 0 m the value oscillates between -1 meter and +1 meter.

A Used technology A/D converter etc. is price/performance compromise. If you want to measure altitude with 1m resolution, always there will be some noise. Its like water surface, looks smooth but never is totally smooth. To eliminate all these effects would increase complexity of LOLO and price, sure.

Q Any chance of getting a version of the XLS that does the graphs in Feet?

A Simply go to Settings > Calculations > Altitude and change the formula to: =(LN(%TV/%TR)*(-29.153)*293)*3.28
3.28 coeficient is derived from feet to meters conversion - 1feet = 0.3048m

Q I need to know the commmunication protocol and data format you use in LOLO.

A You can take a look to first page (DATA) and then take a look to formulas used. LOLO sends data via standard RS232 link in 8N1 19000Bd text format. It sends data exactly like you see it at Data sheet. You can start some Windows terminal and you can receive your data. Each block starts with 127 character, then next 2 bytes are reference pressure (raw data) for given block (zero altitude), next 1 byte is storage period for given block in tenth of second. Next bytes are altitude readings in differential format, signed char. So you need to add/sub this value from reference pressure. Then you need to calculate real atmospheric pressure and then the altitude. Used formulas are seen in Excel macro. This format will not be changed, so you can develop your sw if you want.

Technical specification

• Dimmensions 40x22x17mm
• Weight 10 g
• Storage period 1/3 sec (customer based) *
• Memory capacity up 18 h ( 8 sec. period)
• Max number of blocks (ON/OFF) 10(unlimited length)
• Power supply 4,4-9,6V
• Consumption 15-17mA
• Resolution 1m
• Max altitude 2000m

*Total capacity of internal memory is 8 180 records. Using 1s period it is (8180x1)/3600=2hours 16 minutes. Using 3 s period it is (8180x3)/3600=6 hours 49 minutes. For Speedy Gonzaleses I would recommend period 0.1s/0.3s which I use. Using 0.1s period (8180x0.1)/60=14 minutes or (8180x0.3)/60=41minutes.

Usual periods and recommendations

• 0.2/0.5 F3F, F3B, F3J and F3K (HLG)
• 0.2/1.0 F3F, F3B, F3J and F3K (HLG) and the others aircrafts with long log possibility 1.0=160min=more than 2.5 hours
• 0.5/2.0 all aircrafts with very long log possibility 2.0=320min=nearly 5.5 hours

It's also possible to make custom made LOLO with any combination of two from: 0,1; 0,2; 0,3; 0,5; 1; 2; 1.5; 3; 5; 8 sec. But will cost you 10 EUR more.

Price&Availability&Order

• Starting 1-st of October 2002 price for one piece LOLO Standard is 99,-EUR (without shipping&handling).
• Starting 1-st November 2002 price for one piece LOLO Race is 109,-EUR (without shipping&handling).

What you will get

• Altimeter including power suply cable with JR connector (10cm length)
• 1,5 m cable with interface for the altimeter, connector Canon 9 with CLEAR button
• From beginning of November 2002 I don't supply SW on floppy disk as standard. You can download it from my site (see bellow). You can get SW on floppy disk on request (+5EUR)

Where I can order it or where I can ask additional questions?

• info@lomcovak.cz