This article demonstrates an automated Return Loss scan of an antenna using: IC-7410 transceiver with CIV; 40dB power attenuator; Return Loss Bridge (RLB); RFPM1 with USB data logger (A prototype data logger for RFPM1); and a PC orchestrating the test. Automation facilitates: measurement of a large number of data points; improved accuracy by reducing the … Continue reading Return Loss sweep using IC7410, RL bridge, and RFPM1
This project is a data logger accessory for Lou Destefano’s (VK3AQZ) RF Power Meter kit (RFPM1). The RFPM1 develops an analog signal 0-2000mV corresponding to 0-100dB input power range, -85-16dBm. The module described here produces a digital output scaled -85.0 to 15.0 for 0-2000mV input. The hardware is based on a clone of the Digispark ATTiny85 … Continue reading A prototype data logger for RFPM1
Review of Boswell et al paper “Performance of a small loop antenna in the 3-10 MHz band” discussed measurement of near-field field strength for measurement of performance of a small transmitting loop (STL). This article describes a method of performing near-field field strength measurements using a portable RF power meter (RFPM1) and a small untuned … Continue reading Near-field field strength measurements using the RFPM1
This article shows use of Lou Destefano’s (VK3AQZ) VK3AQZ RF power meter (RFPM1) to adjust the output power of a low power transmitter. Above, the test setup used. Last update: 9th December, 2014, 8:39 AM
This article shows use of Lou Destefano’s (VK3AQZ) VK3AQZ RF power meter (RFPM1) to plot the response of a 144MHz filter. Above, the RFPM1 as used. Above, the test setup. The filter (DUT) is connected between a standard signal generator (SSG), and the RFPM1 connected to the filter output. A DVM recorded the DC voltage on … Continue reading VK3AQZ RF power meter (RFPM1) – filter response example
This article documents my build of Lou Destefano’s (VK3AQZ) RF Power Meter kit. The power meter is based on probes using an AD8307 logarithmic detector. Above, the RF Power meter with two probes. (The ferrite sleeves were not part of the kit.) Last update: 9th December, 2014, 8:39 AM
I have been asked about compatibility of the RFPM2 current probe with the TinySA and variants. The current probe was intended for use with a broadband 50Ω RF power meter, but could also be used with a Spectrum Analyser with 50Ω input or an oscilloscope with 50Ω input. RFPM2 – current probe described a current … Continue reading RFPM2 – current probe – #4 – TinySA Ultra
RFPM2 – current probe described a current probe for use with a power meter calibrated in dBm (eg RFPM1 and RFPM2). RFPM2 – current probe – #2 exposed some of the build details. This article reports the completed article. Above the current probe with RFPM2, the display does not show well at this camera angle… … Continue reading RFPM2 – current probe – #3
RFPM2 – current probe described a current probe for use with a power meter calibrated in dBm (eg RFPM1 and RFPM2). Progress has been slow (too many projects?), but the CNC Router project matures and it is time to try making some components of the current probe. The PCB was designed in Kicad. Electrically, the … Continue reading RFPM2 – current probe – #2
This article describes a current probe for use with a power meter calibrated in dBm (eg RFPM1 and RFPM2). For use with RFPM1 and RFPM2, both of which read to 16dBm max, it is convenient that the scaling factor for the probe is 0dBA/dBm, ie that those meters read dBA directly, implying a current range … Continue reading RFPM2 – current probe