Repeater Interference Reports

K4LKW Repeater system users are requested to assist in determining the source of interference. In addition to obvious malicious jamming, interference may consist of short bursts or repetitive keying.

Follow these steps when you note interference:

(1) Switch to the input frequency (147.930 MHz) and note strength of the interfering signal. Even an HT is valuable for this purpose. This is the most important thing to do first.

(2) If your station includes a rotating beam antenna, determine the direction of maximum signal strength on 147.930 MHz.

(3) Send a report by e-mail to the repeater trustee Thomas Ryan K4KH at or by telephone at 863-605-1715. Note the direction of signal peak and/or strength. Terms such as “no signal…weak signal….moderate signal….strong signal…..full-scale signal” etc. can be used along with directional compass quadrants or headings from your location. Also note any background sounds or unique characteristics.

(4) If the signal on 147.930 MHz is very strong, disconnect your antenna and note if the signal is still heard. If so, the source is within a few blocks.

(5) If time permits, go mobile and attempt driving in an ever expanding circle away from the repeater site and note where signal peaks occur on the input frequency based upon the signal meter on your mobile rig.

(6) If jamming consists of very short transmissions (under five seconds or so), using a second radio to monitor the repeater input frequency simultaneously may help you prepare a more accurate report. Remember that reports of “no input signal heard” are very valuable in narrowing down the location of the source.

(7) Do not communicate with a person believed to be unlicensed. As reports from users in various parts of the coverage area increase, the likelihood of locating the source also increases.