My english translation perhaps it is not so good to understand the text well, for that reason in a temporary way I will leave close the original paragraphs in Spanish to check.
 

Quiero dedicar este pequeño y modesto "inventito" a don Alberto Silva - "Uranito" (LU 1DZ), quien me ha honrado con su franca amistad y sobre todo su siempre estimulante y alentadora confianza. MRG.

I want dedicate this small and modest "invention" to don Alberto Silva - "Uranito" (LU 1DZ) who has honored me with their frank friendship and mainly its always stimulant and encouraging trust. MRG.

El choke balun ha representado una solución más efectiva, desde el punto de vista eléctrico, para antenas monobanda (no estrictamente), pues no padece de los problemas de saturación, deformación, generación de armónicos, destrucción por errores, calentamiento-pérdidas, etc. de los balunes de banda ancha realizados con nucleos de ferrite.

The balun choke has given us a more effective solution, from the electric point of view, for monoband antennas (not strictly), because it doesn't suffer of aturation problems, deformation, harmonic generation, destruction due to operation errors, heating-losses, etc. of the wide band baluns made it with ferrite cores.

Una injusta fama que suele atribuírsele al choke balun es su peso, en mi opinión no es justificada. La objeción no resiste mucho análisis, pues si la antena estuviera unos pocos metros más elevada tendría también ese peso adicional en su propia línea de trasmisión adicional, su dueño no se quejaría de él y, por el contrario, la exhibiría con orgullo antes sus colegas.

An unjust fame that usually attributes to balun choke is its weight. In my opinion it is not justified. The objection doesn't resist so much analysis, because if the antenna was a few meters higher would also have that additional weight due to its own additional transmission line length and its owner would not complain about it, on the contrary, it would exhibit it with pride before his colleagues.

It has devised a variant to build an excellent monoband balun based on similar principle. Substituting the usual choke winding for a parallel resonant circuit offering much higher impedance to circulating current on the external side of coaxial feeder.

En efecto, si se arrollan unas pocas espiras de cable coaxil (bastante menos que en el choke balun, desde ya) y entre los extremos de esta bobina formada con el mismo cable coaxil se suelda sobre la malla el capacitor de sintonía, como se muestra en la figura (la zona oscura del dibujo representa la malla), este conjunto bloqueará el paso de la corriente comportándose, al igual que su predecesor, como un un balun de corriente cumpliendo mejor su rol que el convencional de tensión construido con bobinado trifilar y núcleo ferrimagnético.

Indeed, if you wrap some few turns of coaxial cable (less than in the choke balun, of course) and, at the ends of this coil formed with the same cable coaxial, it is welded on the braid a tuning capacitor, like it is shown in the figure (the dark area of the drawing represents the braid), this parallel trap will block outer currents behaving, the same as its predecessor  working as a current balun doing its job better that the conventional of voltage baluns built with trifilar winding and ferrimagnetic cores.

Así, no solamente disminuye el peso sino que la impedancia que bloquea la corriente es mucho más elevada; únicamente un choke balun con espiras suficientes para autorresonar con su propia capacidad distribuida presenta la misma propiedad, pero precisa mayor cantidad de coaxil (ver tablas de referencia la referencia al sitio de K1TTT al final).
No hemos visto esta solución en la literatura, no descartamos que haya sido planteada con anterioridad, si no es así nos reservamos el copyright ;>)

In this way not only the weight is lower, its impedance is much higher; only a choke balun with enough turns for auto-resonate with its own distributed capacity gives the same result, but needs more length of coaxial (see the reference tables in K1TTT website cited at the end of this article).
I have not seen this solution in the literature, I don't discard that it has been outlined previously, if it is not so I reserve for me the copyright... ;>)

Alguien podría preguntarse qué sucede fuera del punto de sintonía. Dependerá de cuánta sea la desintonía. Si  operamos no demasiado debajo de su frecuencia de resonancia, presentara una reactancia inductiva muy elevada, por lo cual conserva su propiedad de bloqueo. Si operamos no demasiado encima de la misma, la reactancia será capacitiva, pero también elevada, por lo cual la propiedad sigue manteniéndose. Dependerá parcialmente de la relación L/C de la trampa.

Somene could wonder what it happens outside of the resonant point. It will depend of how much the off-resonance is. If it we not operate too much under its resonant frequency, it presents a very high inductive reactance, reason why it conserves its blocking property. If we not operate too much above the same one, the reactance will be capacitive, but also high, reason why the trap, continues making its job. It will depend partially on the L/C relationship of the trap .