For VHF frequencies selected in the L-Tronics LA-Series DF, the unit may interfere with the selected frequency +/- 10.7 MHz (the intermediate frequency). It may interfere with either aircraft communications or navaids according to the chart above.

For UHF frequencies selected in the DF unit, interference on the half harmonic of the selected frequency +/- 10.7 MHz.

Those interfered frequencies listed as "none" could possibly still interfere with a nearby ILS, VOR, or Communications frequency but the chances are far more remote. The interfered frequencies for 282.8 MHz are both outside the aviation navigation and communication bands, but the upper frequency is within the Amateur Radio spectrum.

This list is not all inclusive. If you have additional frequency crystals installed in your DF unit that are not listed here you must calculate the interfered frequencies using the following equations: VHF DF Freq +/- 10.7 UHF (DF Freq +/- 10.7)/2

Interference may possibly occur when using an LH-series L-Per portable DF unit.   Of special note might be conflicts with amateur radio frequencies.

For more information on some of the lesser-known frequencies listed in this table, see the UHF L-Per Training page.