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November 1962 Radio-Electronics
 [Table of Contents]
Wax nostalgic about and learn from the history of early electronics.
See articles from Radio-Electronics,
published 1930-1988. All copyrights hereby acknowledged.
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If you believe the claims
and the radiation pattern plots and graphs presented in this 1962 Radio-Electronics
magazine advertisement, then JFD Electronics had a pretty nice television antenna.
Per the data, reception gain was nearly perfectly flat across the
lower channel
band (2-6) and across the upper channel band (7-13), corresponding to 44-82 MHz
and 174-210 MHz, respectively. That is the VHF (very high frequency) band.
Model LPV-11 is featured in the image and the data. It was an 11-element log-periodic
antenna with "9 Active Cells and 2 directors," with an effective range of 100 miles.
The ultimate model was LPV-17, with "15 Active Cells and 2 directors," and a range
of 175 miles. That's a long way for picking up a TV station, but the high gain is
also useful for much closer, weak signal regions.
UHF (ultra high frequency), covering channels 14-83, occupied the 470-884 MHz
band. 1962, the year of this article, is the same year that the
All-Channel Receiver
Act which compelled manufacturers to include UHF reception on all new TV sets.
In typical bureaucratic fashion, that forced consumers to pay for a feature they
did not demand nor particularly want or need. The only show I remember watching
on UHF was Bob Ross (a career USAF medical technician) painting "happy little trees" on PBS.
JFD Electronics Corporation Log-Periodic LPV TV Antenna
 Revolution in the Air: JFD Presents The
Log-Periodic LPV
Initially Developed by the Antenna Research Laboratories of the University of
Illinois*, Proved-Out In Air Force Satellite Telemetry, Adapted to TV by JFD-Ending
the "Era of Compromise" in TV Antenna Design
It could only have been produced by such massed resources as
those of a prominent university, the military, and the country's leading antenna
manufacturer.
Because its gain is independent of frequency, the backward-wave
log-periodic LPV functions with high efficiency across the entire band. This end-fire
array is comparable on any channel to a tuned Yagi cut to that channel.
On virtually every count, it outperforms previous wide-band arrays:
in gain, in directivity, in bandwidth, in front-to-back ratio. It has gains as high
as 14 db. in the 17-element model. It shows flat response across both TV bands -
with greater gain on the high band, where it's needed most. Result: An all-channel,
all-purpose antenna with unprecedented gain, a decisive end to snow and ghosts and
the truest color reception yet - as well as vivid sharpness in black and white.
The basic log-periodic LPV principle will be also adapted to all future UHF antenna
needs.
More, far more, than just a "fringe" solution, the log-periodic
LPV gives superior reception in all multi-channel areas. It is the first true "universal"
TV antenna. It will open key profit opportunities to you in the months ahead - not
only because it puts better reception within the reach of virtually every TV set-owner,
but because it enables you for the first time to meet all antenna needs with a single
antenna line.
Not a "catch-all compromise" - the log-periodic LPV signals a halt to the endless
piling-on of narrow-band elements and parasitics. It is essentially frequency-independent
since it is derived from an antenna geometry that repeats the electrical properties
of the basic element, or cell, periodically; the periodicity being proportional
to the logarithm of the frequency. (Actually, the basic log-periodic design is capable
of flat response over a frequency range as broad as 20 to 1.)
Based on principles designed to meet rigorous Air Force performance standards
- built to uncompromising JFD specifications - of AAA† Gold Bond Alodized
aircraft aluminum for enduring good looks.
100% preassembled Flip-Quik construction - with new "tank-turret"
aluminum brackets that align and double lock the elements instantly and permanently
in place.
Receives stereo FM, too - delivers drift- and distortion-free
FM stereo.
See the Log-Periodic LPV at your JFD distributor - study the
performance figures - try it-see for yourself how the LPV towers over all other
broad-line antennas.
JFD the Brand that Puts You in Command of the Market
JFD Electronics Corporation
6101 Sixteenth Avenue, Brooklyn 4, N.Y.
JFD Electronics-Southern Inc., Oxford, North Carolina
JFD International, 15 Moore Street, New York', N.Y.
JFD Canada, Ltd., 51 McCormack Street, Toronto, Ontario, Canada
557 Richards Street, Vancouver 2, British Columbia
† Attractive, Anti-corrosive
Armor
* Produced exclusively by JFD Electronics under license to theUniversity of Illinois
U.S. Patent Numbers 2,958,081 - 2,985,879 - 3,011,168 Additional Patents
Pending
One Basic Configuration Satisfies All Needs:
Harmonically resonant V-elements operating on the Log-Periodic Cellular Principle
in the Fundamental and Third Harmonic Modes:
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