I have tried coaxial fed antennas, including my HyTower with a 160-meter quarter-wave element added. But, using a random length of wire just works better!įor an antenna, I use a random length of wire connected directly to the unit. Although its primary application was intended to be on high-density long-haul microwave systems the 6041 SLM may be employed on any communications. I have tried coaxial fed antennas, including my HyTower with a 160-meter quarter-wave element added. Rycom 6041 Selective Level Meter Voltmeter / VLF Receiver makes measurements of both level and frequency on frequency division multiplex (FDM) equipment baseband signals. The frequency "readout" is digital and is displayed on a screen.įor an antenna, I use a random length of wire connected directly to the unit. The unit also has a couple of bandwidths available. It also tunes, in several ranges, from 2.5 kHz all the way to 200 kHz. This is a solid-state unit that has AM, LSB, and USB capabilities. The "selective levelmeter" used here, at K9STH, is a Raycom 6010. The primary difference between these "meters" and a "regular" receiver is that the "meters" also have a means of measuring signal levels very accurately. Those units are called either "selective voltmeters" or "selective levelmeters". There is one group of "special" receivers that are not generally "thought of" as being a receiver and that are relatively common and, thus, available, at a reasonable price. However, to receive that frequency range generally requires things like converters, special receivers made to cover that range, and so forth. If one can live with a 180 ambiguity for the bearing (azimuth angle), a simple and small antenna like the one presented below can be used. There is some interesting "stuff" on VLF (very low frequency). With two crossed loops, one North/South, one East/West, radio-direction finding on VLF is possible.