E. Mendieta-Otero | Searcharxiv

arXiv2024

Interference Simulator for the Whole HF Band: Application to CW-Morse

In this paper, we use jointly a model of narrow band interference and a congestion model to model and implement an interference simulator for the whole HF band. The result is a model to generate interfering signals that could be found in a given frequency allocation, at a given time (past, present, or future) and for a given location. Our model does not require measurements and it is characterized by its ease of use and the freedom it offers to choose scene (modulation, location, week, year, etc.). In addition, we have defined a generic modulating function and the conditions to model a contact continuous wave (CW)-Morse, which meets the usual standards of contest. Consequently, our interference model in conjunction with the CW-Morse modulating function designed results in a specific CW-Morse model for amateur contests. As an example of the simulation model, we simulate the CW-Morse communications on the contest ARR ARRL Field Day 2011.

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arXiv2024

Novel Phase Detector Measurement Procedure Using Quasi-Synchronized RF Generator

This paper presents a new procedure for phase detector measurements that allows the use of generators that share a 10 MHz reference oscillator but do not synchronize in phase, in other words, quasi-synchronized RF generators. The objectives are taking advantage of the benefits of using two generators but recovering lower-cost generators that have worse synchronization performance and opening the door to the possibility of using a very simple control element based in Arduino Uno and cheaper instruments. The new procedure is characterized by continuously alternating calibration and measurement sequences to make up for the phase drift of quasisynchronized generators and guarantee a maximum phase error specification (+-1 grade in this paper). Data acquisition has been divided in two stages: measurement of detector curves without phase reference (in-phase and phase-shifted) and measurement of reference data. All the data is later combined to obtain correctly referenced in-phase detector curves. The technique can be reproduced with other equivalent instrumentation. The novel procedure that allows compensation for errors (amplitude, phase shift, mismatching, etc.) is detailed, and its relation to the required measurement accuracy is amply discussed. The proposed technique is applied to characterize a phase detector based on in-phase and phase-shifted multiplication from 3 to 8 GHz with 1 GHz step. Measurements have a final maximum error of +-2 grade for both frequency and calibrated input power, according to the accuracy specifications of the VNA used to calibrate the signal distribution network, added to the +-1 grade specified in this new procedure.

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