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About RF Cafe
1996 - 2016
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...
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April 1946 QST
At first I thought maybe this was intended to be an April Fools joke, being that it appeared in an Aril issue of QST, but it is probably just a coincidence. One of the two topics refers to a 'door knob for UHF,' which in reality was a glass-encased vacuum tube that was shaped a lot like one of the old glass door knobs. The author penned a humorous take-off. On second thought, maybe this is a Fool's edition now that I have read the second item. All kidding aside, "Strays" concludes with a poem dedicated to those who became 'Silent Keys' as a result of World War II.
Having heard and read much about the famous "door knob" for u.h.f., we decided to try it. We removed the knob from our door and substituted it for the HY75 in our pet oscillator. Vast improvements were immediately noted, among which were:
1) Remarkable lack of spurious radiations such as sidebands, parasitics, and harmonics.
2) Stability under modulation.
3) Constant power output and stability over the entire tuning range.
4) No overheating of the doorknob even under heavy load.
5) Circuit constants not critical for normal operation - therefore likely to give same results even for beginners.
Before you try it, however, make sure your power supply can take it, as the power consumption is rather excessive. The theory of operation is beyond the scope of this paper. Suffice it to say that by Judicious use of relativity theory, calculus of variations, and advanced buggering we became convinced that this apparatus was the most sensible way of going insane since the invention of the regenerative receiver.
- Victor Mayper, Jr.
- Fred Kann
Connecting-wires in radio receivers are eliminated by a method announced recently. Bare metal sprayed into channels in a plastic chassis is the basis for the method which, it is said, speeds production, reduces operating costs, permits lower prices and improves performance of radio receivers. The process has been used in other countries, particularly Germany, where in wartime the spray method was used in the fabrication of radio coils.
How sweetly sleep the Silent Keys!
How proudly wear the Golden Star,
Who gave their lives beyond the seas
In the red hell of war.
They heard the challenge to the right
By which all free men seek to live;
They knew the cost to win the fight,
The price that they should give.
Yet went they forth from hill and plain,
From friendly cities of their birth,
To bring goodwill and peace again
To all the ravished earth.
And now they sleep in foreign fields
Beneath the crosses and the stars;
With memory's tears alone the yields,
And Silent Keys and Stars.
O soldiers, sailors, home again,
Prevent these endless wars
Where right survives by blood and pain,
By Silent Keys and Stars,
- Lt. Comdr. Robert D. Bass, W4CQG-W3JSI
Posted April 19, 2016