The LL Series Little L-Per Portable Direction is a compact, hand-held, synthesized receiver with tunable, folding antennas capable of receiving AM and FM signals. The sealed case is a high-impact plastic and all exposed metal is stainless steel for corrosion resistance. A finger-operated, gasketed plug allows for the AA batteries to be quickly replaced. External antenna jacks allow for connection of L-Tronics magnetic, flexible, and aircraft antennas, as well as other antennas such as beams. A third connector on top of the receiver is used for external DC power (6-28V) and earphones.

The DF Display shows direction and signal strength simultaneously (433 and left above), along with other information such as frequency, battery life, external antenna connection, etc. Both the display and the keyboard are lit by LEDs and fiber optics for night operation.

The receiver is pre-programmed with 121.5 MHz, 121.775 MHz, 243 MHz and Marine Calling frequency 156.8 MHz. These frequencies cannot be changed or accidently erased by the user. Six additional memories can be programmed by the user from the keyboard. (For special applications, the pre-programmed frequencies can be changed at the factory.)

The stainless steel antennas and the handle fold up so the receiver can be placed on a car or plane dashboard or packed easily in a backpack. Batteries are replaced through a finger-operated plug on the right side. The case is sealed and designed for up to 15,000 feet altitude or10 foot immersion in water, and a –20 to +60 °C temperature range.   It  will float.

Direction finding techniques are the same with this equipment as they are with the older style LH Series Little L-Per . However, there are some important differences in the details of operation :

It is not necessary to change the built-in antennas when changing frequencies.   External DF antennas are automatically selected when they are plugged in.

The LL Series receiver uses a transflective LCD display which, unlike some cell phone displays, is clearly readable in direct sunlight.

The display shows left-right homing AND signal strength (by number and bar scale) SIMULTANEOUSLY.

The receiver can be set to any frequency in 100 Hz steps from 108 MHz to 174 MHz and 215 MHz to 270 MHz using the panel keys.

The new L-Per has a stable logarithmic or "linear in dB" receiver and the display shows strength both as a moving bar and a number between 400 and 999 (to avoid confusion with compass directions).

The new unit uses widely available alkaline, NiCd, NiMh, or some 1.5V lithium iron AA size batteries.  Some 3V lithium batteries will fit into the receiver but they will cause overheating and possibly permanent damage. DO NOT USE THEM!

The DF is not field repairable but has a built in test function.  Pressing the CAL key will cause an internal calibrator to align the receiver and antennas when needed and give a "fail" message if the unit is not working properly.

While the unit is capable of receiving 215 MHz, it will not presently track the "Project Lifesaver" or other similar animal tracking transmitters. If this software provision can be made in the future, the units can be upgraded for it.  We will post availability on this web site.

The unit  has an Automatic Power Off (APO) function which will turn the receiver off if no keys are pressed for either 15 or 60 minutes, as selected by the user. The APO feature can be turned off and is automatically disabled while using external power.

A Beat Frequency Oscillator (BFO) function allows unmodulated (carrier only) signals to be heard and can give a small improvement in the ability to hear very weak ELT/EPIRB signals.

Accessories for the LL Series Little L-Per DF include a carrying case, DC power cords and a mounting bracket, as well as magnetic, flexible, bent whip and other antenna options for mounting on vehicles,boats and aircraft .

The LL Series Little L-Per Portable Direction Finder Operating Manual, sent with each unit, contains complete operating instructions.    Download manual PDF (400kb)