It is not easy for me as a lover of radio, talk of Collins ...
... a kind of awe takes me, afraid to write something inaccurate in the face of what was and is an integral and indispensable point of reference for Amateur Radio and Radio!
In the United States amateur radio operators have always been a 'Creation!
Ammirati, understood and respected a lot more than we already in the post-war radio amateurs were well known and popular.
Radio amateurs representing an era 'elite!
The Ham Spirit is very important, all were also engineers, homebuilders, but most of all gentlemen!
are lucky and wealthy could afford to buy the equipment.
Then in the '60s, several houses were trading in U.S. amateur radio equipment:
Among the many, I cite the HALLICRAFTERS, the Swan, Heathkit, the Ten Tec, National, Drake and Collins! Collins
The pressure was well
ente sul mercato americano fin dagli anni '30, con apparati militari, civili e radiomatoriali, nel 1946 uscì il 75A-1 un ricevitore supereterodina AM - CW a due conversioni abbinabile al trasmettitore 32V-1. Ma per quanto ci riguarda più da vicino, la vera rivoluzione iniziò negli anni '50 con la nascita dells nuova era della SSB ...e con suo il magnifico ricevitore Collins 75A-4, con il tx KWM-1 e col mastodontico trasmettitore Collins KWS-1 da 1000W!!
Sul QST del aprile 1955 il Collins 75A-4 venne descritto, senza mezzi termini, come una vera e propria rivoluzione nel mondo HAM!
Alla fine degli anni '50 la Collins launches a new line of devices that will make time!
The "S"!
A new line of compact and versatile equipment, and lots of accessories that make the joys of operators in the past, and the punishment of today's collectors!
Founder of the "S" was composed in 1958, separate line from the receiver tube 75S-1 double conversion transmitter and 32S-1 100W will make history its beautiful appearance, which will remain the line carrier all later versions. Her beautiful
VFO with "only" 200 kHz band ... but sweet like no other.
The Collins mechanical filter with 2.1 KHz, which became legend!
now concentrating on the receivers, which were produced:
the Collins 75S-2 which basically follows the 75S-1 in everything, but oriented to a market or civil government.
After a Collins 75S-1 'more qualitative leap came in 1961 with the Collins 75S-3!
At first it seems the same 75S-1, but in reality has valuable innovations:
were implemented numerous improvements to increase the selectivity of the receiver, was added an adjustable BFO, AGC control a tunable at will ... and last but not fundo a wonderful circuit Rejection Tuning (Notch).
commands that you will find on a Collins 75S3 are few, but soon you realize that you do not need anything else:
I like to describe the pleasure that you try manipulating the controls of Collins, who respond with a sweetness and a disarming simplicity. Turn your beautiful
Collins 75S-3, adjust the preselector and the Volume (powerful), after tuning a nice QSO in the middle of the QRM, still need to do only two things!
Adjust the RF Gain and Rejection Tuning, and as if by magic, you will be imbued with a sense of peace and pleasure!
The QSO that first come
vava amid the noise, now get in the middle of a quiet absurd! absurd for those coming by transistor devices or worse in DSP (without wanting anything away, the other amazing performance, these devices have these wonderful).
who has never tried a tube receiver with Notch, probably does not know what has been lost, or what I'm writing ... try to please!
Maneuvering the Notch, and a clever use of a real RF Gain, you ask, what is today the Noise Reducción in modern DSP devices, if they did 50 years ago already ... and much better than today!
In 1964, Collins produced another new relase with the 75S-3B circuit similar to its predecessor, but incorporated the possibility of changing now with four filters band, as well as the famous SSB filter, the filters and the narrow CW filter AM.
last pearl of Collins, was in 1967, the Collins 75S-3C, almost equal to the 75S-3B but easily recognizable by the double gang switch with white background, to be able to switch between the amateur bands and other bands optional, which could be added at will!
The Collins 75S-3C was produced intermittently until 1979, although the largest production ended in fact, already by 1975. And is now one of the receivers most sought after by collectors and enthusiasts, ever! What
tell you now ... I can only tell you to understand me, you should try to have in your hands a valvular apparatus, who has already Drake tried such a R4b, already knows what I speak, but I must say that listening to Collins 75S-3C is something different and even more magical!
Who knows, perhaps for the
his legendary aura that surrounds him, the fact is that for me the Collins 75S-3C is a gem of a deeper purity, that only the equipment valves could give! Citations:
Remnants Of A Deeper Purity - Black Tape For A Blue Girl (1996)
The main photo is taken from the website:
http://www.g4ccz . co.uk /
The images of the brochure are taken from the websites:
http://www.wb4hfn.com/
http://www.radioing.com/collins/ads.html
iv3hls ham radio Tales is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 2.5 Italy License .
0 comments:
Post a Comment