In installations where a smaller antenna is required then suitable alternatives can be used

Easy to use and faster to tune

Self-locking

and as a result

datcon hour meter 873 12 24v Compasses In installations where a smallerOverview Mounts in standard 2 1 4" instrument hole. Standard equipment in most production aircraft. Operate on any DC voltage from 12 to 24 volts. These solid state hour meters are recommended for use on aircraft because they start or stop instantly when power is applied or removed. Furnished with mounting hardware. If meter is connected improperly it will not operate but meter will not be damaged. The running indicator indexes every 6 seconds.