Artairmritrre
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Progress to date
A. The detecting device which consists of a special Sege Laboratories, Inc.
tripolar crystal bolder having a TSC input connector and an MB output
connector with a 1N358A tripolar crystal mounted in the holder has been
tested over the entire frequency range from 50 mc to 10,000 ne with
satisfactory results. Average tangential sensitivity*readings of
several crystals and holders ware approximately -50 1-2 dbm. This
detector unit will be used with the various antenna and filter systems
which cover the 50 me to 10,000 re frequency range.
B. Modified logarithmically periodic (abbreviated-LP) antennas covering
a 10 to 1 frequency bandwidth toms 50 we to 500 mc are under construction.
The antenna Is designed to have a lower frequency limit of 200 me but
will be used below cutoff to 50 mc because of the physical requirements
of the System. Prototypes of this antenna have been tested both for
radiation pattern characteristics end for impedance characteristics.
Satisfactory results were obtained in both tests. However, AS was
expected belay the 200 we cutoff frequency, the operation of the antenna
deteriorates markedly. The final models of these antennas will cousin,
rAingential sensitivity measurements are obtained by feeding a 10 microsecond
duration, 1000 cycle per second repetition rate, pulse modulated RF signal to the
input of the detecting device. Th.e output of the detector is then fed into A
video amplifier and the output of the amplifier is displayed on an oscilloscope.
tangential signal is defined as that input signal which will produce an output
signal whose amplitude is twice the implitudik of the system noise level.
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C. Final 'lodes of the 500 me to 1000 me LP printed circuit antennas have
been constructed and tested both for pattern end for impedance perfor-
mance with satisfactory results. The anteana elements are etched onto
a teflon-glass LJ,-rd and after placement of the feed lines and connectors
the unit is gold Oated to resist deterioration by exposure. This
antenna is a truncated version of a 500 me to 10,000 me prototype
printed antenna.
D. A prototype 1000 me to 10,000 ver LP antenna has been tested. The impe-
dance and pattern behavior are satisfactory over the 10 to 1 frequency
bandwidth. This antenna is obtained by removing the lower frequency
elements from the 500 me to 10,000 ne prototype antenna
E. Final models of the 10,000 to 40,000 mc horn antenna and waveguide
detector assembly are undel ,,-ustruction. A prototype antenna and
detector have been tested with satisfactory results over the entire
frequency range. The filters for use with this antenna exhibit high
pass characteristics and make use of the natural and dielectric loaded
lower cutoff nature of the waveguide which connects to the horn antenna.
For the 30,000 mc to 40,000 mc frequency range the antenna and waveguide
assembly operate under normal conditions; specifically, with air as the
dielectric medium. For this condition the waveguide has a natural
cutoff at approximately 26,500 me Operation over the 20,000 to 40,000
me frequency range is obtained by loading the waveguide with plexiglass
(dielectric constant av-oximately equal to 2.5) in such a manner that
the cutoff frequency of the waveguide is lowered to approximately
17,000 mc. The plexiglass material is also extended into the throat
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Declassified in Part - Sanitized Copy Approved for Release 2012/09/12 : CIA-RDP78-03424A002100040041-1
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1 , criteria is a modified version of the procedure which was programmed
1L
on the IBM 650 and utilizes insertion loss and image parameter tech-
niques in combination. The design obtained for the 2 to 1 bandwidth
filter above need only be scaled in size to make it applicable to the
other octave frequency ranges. The 2000 mc to 4000 me bandpass filter
insertion loss vs. frequency response is shown in Figure 1 to indicate
of the horn antenna to insure satisfactory propagation of the energy
incident at the aperture of the antenna into the dielectric loaded
waveguide. Operation over the entire frequency range from 10,000 me
to 40,000 mc is accomplished by inserting into the waveguide a different
material with a dielectric constant approximately equal to 14. This
material is extended into the throat of the horn for the same reason
as was the plexiglass insert. The high pass filtering characteristics
of the air dielectric, plexiglass dielectric and high dielectric equal
to 14 have been satisfactory.
F. Bandpass filters for use with the 50 mc to 500 mc cloth antenna have
been purchased from Microphase Corporation. The 50 mc to 100 me and
100 me to 200 mc filters have been delivered and preliminary system
evaluation has been initiated using the prototype cloth antenna. The
filtering characteristics of the filters are satisfactory. The 200 mc
to 500 mc bandpass filters are on order and should be delivered during
the next month.
G. A prototype 2000 mc to 4000 mc transmission line bandpass filter has
been constructed and tested with satisfactory results. The design
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the progress of the filter development program. The test results
demonstrate adequately the possibility of constructing a bandpass filter
using transmission lint techniques to give the desired skirt and pass
band characteristics. The prototype filter does not in its present
condition conform to the size requirements as specified in the contract.
To rectify this situation a filter which is loaded with dielectric
dtix?
material(is beta* constructed. In addition, the filter will be folded
to decrease its overall length to acceptable dimensions. A prototype
8,000 me to 10,000 mc stripline filter is being constructed and work
has been initiated to construct prototype 500 me to 750 mc and 750 mc
to 1000 mc transmission line bandpass filters. In addition to the
basic filter design, a low pass filter section mast be included with the
bandpass filter to insure satisfactory stop band protection to frequencies
beyond the usable range of the associated antenna. This will be accom-
plished by using either a series stub or a low pass end section as an
integral part of the bandpass filter unit. It is understood that the
effects of loading the filter with dielectric and folding the filter to
further reduce the physical dimensions will introduce additional attenu-
ation and reflection in the passband, however, these degradations should
not impair the satisfactory performance of the receiving system.
II. Present activity and future plans
A. Sensitivity evaluation of the 50 mc to 500 mc antenna, filter and
detector systems has been started. Some problems are being encountered
in matching the crystal detector unit input impedance to the output
impedance of the bandpass filters for this frequency range, but it is
presumed these difficulties will won be resolved. All components of
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Declassified in Part - Sanitized Copy Approved for Release 2012/09/12 : CIA-RDP78-03424A002100040041-1
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this system (with the exception of the 200 mc to 500 mc filter which
has not been delivered) function individually as desired. The present
effort is being directed toward integration of the separate units into
a complete system.
B. Prototype filters for the 500 mc to 10,000 mc frequency range are being
assembled and tested as they are received from the model shop. System
sensitivity evaluation of the assemblies covering this frequency range
will be delayed until final models of the filters are constructed.
410 C. As indicated 'Wave, the final models of the 10,000 mc to 40,000 me horn
antenna, detector and waveguide inserts are under construction. System
evaluation of these units will he delayed until the 36,000 mc to 39,700
mc klystron is replaced in the high frequency tuning unit of the Polorad
CHF signal generator. Preliminary system sensitivity measurements have
been satisfactory.
III. Summary of project statue
To summarize the progress which has been made to date, the degree of
completion of the various sub-units in the system is illustrated in
411 the following table.
Unit
Degree of Comzletion
Deliverable Deliverable
Prototype Models Prototype Models Models Being Models
Bei= Fabricated Tested Fabricated Completed
1. 50 mc to 10,000 mc
Detectors X
2. 50 me to 500 me
Antenna
3. 500 sic to 1000 mc
Antenna X
4. 1000 mc to 10,000 mc
Antenna X X
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? Declassified in Part - Sanitized Copy Approved for Release 2012/09/12 : CIA-RDP78-03424A002100040041-1
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Deliverable Deliverable
Prototype Models Prototype Models Models Being Models
beim Fabricated Tested Fabricated cpueleted
5. 10,000 mc to 40,000 mc
Antenna and Detector
Assembly X X
6. 50 mc to 100 me Filter
7. 100 mc to 200 me
Filter
S. 200 me to 500 mc
Filter X
9. 500 me to 750 me
Filter X
10. 750 mc to 1000 me
Filter
0 1000 me to 2000 me
Filter X X
12. 2000 me to 4000 mc
Filter X X
13. 4000 me to 8000 me
Filter X X
14. 8000 me to 10,000 mc
Filter X
15. 10,000 mc to 40,000 me
Waveguide Insert
16. 20,000 me to 40,000 me
Weveguide Inserts
2.eiPactfully aubmitted
X
X
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Declassified in Part - Sanitized Copy Approved for Release 2012/09/12 : CIA-RDP78-03424A002100040041-1
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