DigiAlarm Lost Model Alarm

Thousands sold worldwide !!


 Play LMA Sound!


One day out flying;

The wind will stop blowing and you will land down the hill
You will have a mid air and crash down the hill - or in long grass like Floyd did in Panama

Floyd had an LMA, he walked/slashed his way straight to the model!

Floyd has since bought many LMAs from us !!!

You will misjudge your landing and end up in the trees behind the slope. We've all done that !!
If you have a lost model alarm fitted you will be able to walk straight to your model and retrieve it. If you don’t it could take days to find (if you are lucky).

I regularly go flying with a good friend. I've seen him spend literally hours looking for a downed plane. He has completely lost 2 planes last year in locations that would be easy to retrieve if he had them alarmed. He got a couple of alarms from me and is now a complete convert. Hasn't lost a single plane, and recovery is now down to a few minutes.

At last year's PSS (Power Slope Scale) Festival at Cajon Pass in California, I heard many of these being used to find planes lost on the mountain hillside (covered with heavy brush). Not a single plane was lost that had one of our alarms on-board.


A Lost Model Alarm is cheap insurance! $19.99 each (Priority Mail shipping $4 in the US Any Quantity !!)


Benefits of the Pathfinder Lost Model Alarm From California Sailplanes:

1) It is the most proven design in the world, thousand sold, and hundreds of planes recovered by their grateful owners.

2) The small size, smaller than a dime, makes it easy to install in virtually any plane.

3 The repeating LOUD High Frequency pattern output is easily seperated from an sounds occuring in nature. The human ear is accustomed to picking out patterns, particularly high frequency patterns, and this one has proven to be effective over and over in all sorts of conditions.

4) The "Power On" 3 beep battery code assure you that you are fully charged and ready to fly... no guesswork.

5) The "Land Now!!" Warning of one long beep is easy to understand.... One beep,,, try to land in one minute.

6) You are warned immediately if someone is on your frequency, and the plane is losing your signal !

7) The alarm can be active on a lost plane for up to 2 1/2 days !!

8) The Pathfinder LMA contains a 30 day replacement warranty against defects in manufacture.

9) After the 30 day warranty, we will replace any Pathfinder LMA for $12 (+ $4 Priority Mail Shipping). Return the old one to us with a copy of your original receipt.


This device uses a state-of-the-art microcontroller giving you advanced features to help prevent the loss of your model aircraft (low battery alarm and interference alarm) and the ability to recover it in the event of you losing it (lost model alarm). Furthermore, DigiAlarm allows you to monitor your receiver battery level during flight by using an audible battery level indicator.


Lost model alarm.
Transmitter interference alarm.
Battery voltage level indicator on power-up and during flight.
Low battery alarm.
Connector pins makes a Y-lead unnecessary.
Low power consumption (alarm sounds for 2 days on fully charged battery).
Compact and light weight.

Operating Voltage 2.7 V to 6.0 V

Operating Temperature -20°C to 80°C

Average Current Consumption - alarm inactive 4.5 mA

Average Current Consumption - alarm active 10.6 mA

Weight 6 g

Size 23 x 12 mm

Low Battery Alarm Threshold 4.0 V


On power-on, the alarm will sound the beep code according to the battery voltage shown in Table 1. During flight, as the battery becomes depleted and the voltage falls through the various voltage zones (represented by battery voltage level in Table 1), the associated beep code will sound 3 times.

Beep Code
Battery Voltage Level

3 short beeps = More than 5.0V

2 short beeps = From 4.5V to 5.0V

1 short beep = From 4.25V to 4.5V

1 long beep = From 4 V to 4.25V

Morse code ‘B’ (continuous) = Less than 4V


Figure 1 illustrates the connection of the alarm between receiver and servo. Make sure the servo connector is fully inserted onto the alarm connector pins (labeled Negative, Positive and Signal). Make sure the alarm is connected to the same port on the receiver that the servo would normally be connected to. When used in conjunction with other DigiProducts, make sure the alarm is upstream (closest to the receiver). The pin configuration illustrated is compatible with Futaba systems and works with all others.


Figure 1. Connection Diagram

Insert the alarm into one of the active channels of the receiver, making sure the connector is correctly polarised (it is possible to insert the connector the wrong way around on some systems - check the color coding). If you are driving a servo with the channel used by the alarm, connect the servo to the alarm as shown in Figure 1, again ensuring the connector is correctly polarised.

Switch your transmitter on. Switch your receiver on and the alarm should sound a beep code according the battery voltage level. Test the alarm by switching off the transmitter. The alarm should slowly sound the Morse code for SOS. If interference is detected, the SOS Morse code will also sound.

Morse code for "SOS": _ _ _ . . . _ _ _ . . . _ _ _ . . ., etc. With your transmitter and receiver on, if the voltage level of the receiver battery pack should fall below the critical level of 4.0V the low battery alarm will sound the Morse code for "B": Morse code for "B": _ . . . pause _ . . . pause _ . . . pause, etc.


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