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Sept. 3, 1946.
H. TUNlcK »
2,406,932
WAVE CONVERSION
` Filed June 16, 1942
2 Sheets-Sheet 1l
Sept. 3, 1946.
H. 'ruNrlcK
wÁvE CONVERSION
Filed June 1e, 1942
2,406,932
2 Sheets-Sheet >2
‘wm__Ow
H
Hill»
W
Zmventor
WOM»
nzaì'î
Gttorncg
‘
Patented Sept. 3, 1946
2,406,932
UNITED STATES 4rfA'l‘lazrrr oFFlcE
WAVE ooNvEnsIoN
Harry Tuniek, Rye, N. Y., assignor to Radio lCor
poration of America, a corporation of Dela
Waffe
Application J une 1.6, 1942, 'Serial N0. 447,225
27 (Jlaìllls.> (Cl. Z50-«15)
l
2
My present invention relates to conversion of
,
is fed through line sito frequency dividers and
Waves of one frequency to waves of another fre
quency. My invention has particular application
to radio relaying systems for relaying frequency
amplifiers lli so that the output thereof as illus
trated is .5 me. in line i2. This frequency divided
energy is further amplified and filtered in ampli
or phase modulated Waves or, more generali ,
ñer I4.
angle modulated waves.
,
¿Another porti-on of the -output of` amplifier ii is
Some of the objects of my invention are, to
fed to aV converter or heterodyning detector i6.
improve radio relaying circuits, to provide radio
relaying circuits which are substantially free 0f
undesired frequency drifts, and `to `prov-ide radio
relaying circuit arrangements highly free of dis
Converter L6 is also supplied through transmis
sion >line i8 ‘with heterodyning waves of a mean
frequency of 600` `rnegacycles. This 660 mc. het
erodyningwave may he derived, as shown, from
tortion and in Which the re-transmitted waves
a relati'veiy constant frequency osciilator 2i) and
always bear a substantially `fixed relation in fre
frequency multiplier 22.
quency to >the received Wave or waves to b_e re
`
Qi' the resulting beat frequencies in the output
layed.
.1-5. of converter i6, the‘diñererice frequency or 10()
Other objects, advantages and features of'my
megacycles fed through amplifier and filter 24
` invention will be apparent as the more detailed
and thence -to asecond converter or heterodyning
description thereof is given.
detector 2t which is also supplied with the divided
In the ’accompanyingdrawings:` ,
_ t
energy .of `.5 rnc, from the output of amplifier i4
Figurexl illustrates a radio relaying system in 20 vthroirgh 'line 28.
which the difference' -frequency between received
`The upper side band produced in converter 25
and roe-transmitted Waves is derived by frequency
is then selected by amplifier and filter 3B >and for
dividing the received Waves. Figure 1 also ern
ploys a local source -of oscillations used first, for
heterodyning dov/n the received Waves and then, 25
for heterodyning back, modified waves for re
transmission.
Figure 2 is a modiñed form of Figure 1 in which
the local heterodyning oscillator ,has been elimi
nated.
i `
the `values vassumed this upper side band would
havea mean frequencyfo-f 100.5 inegaoycles. This
selected `upper side band from amplifier and ñlter
30 is then `fed to another converter 32 by way of
line 3ft. Converter 3,2 is also supplied with 609
mc. locally generated Waves through line 3B. The
output of converter `32 maythen befed to a »filter
and amplifier l3,8 through `'line 4D. Filter and
Figure 3 is another form of my invention
wherein one part of `,the received Waves is fre
quency divided and then combi-ned with ‘another
part of the received `Waves to produce a different
amplifier 38 may be adjusted .and constructed ‘so
as to pass the meanldii‘ference .frequency or 499.5
megacycles to .the .re-transmitting antenna 42 by
way of «line .44. If desired, of course,
may .be
frequency for retransmission, and
adjusted Áand constructed so as to pass the other
or‘upper side band which lwould have as--its mean
`
i
Figure 4 is a modified form of Figure 2.
Referring to Figure 1, ultra short waves are
received upon the antenna 2 and fed through
transmission line à to amplifier 6. The waves
received upon antenna 2 are assumed to be fre
qutncy or phase modulated or, more generally,
angle modulated. For greater ease in explaining
the invention of Figure 1, it shall be `assumed
that the received waves have a mean or carrier
frequency of 56€) megacyeles and that the carrier
has been modulated with one or more signals.
Further, it is assumed that the maximum fre
quency swing of the carrier produced by maxi
mum amplitude signal voltages is plus and minus
200 kilocycles.
.
It is to be clearly understood that these fre
quency values have been arbitrarily chosen and
are illustrative only >and are not to be `considered
in any Way as limiting the present invention.
Part of the amplified energy from 'amplifier S
frequency 500.5 megacycles.
Also; it is to he understood that filter 3i) may
be adjusted so as to pass 99.5 mc.. in line 3d and
in that event nlterßëi could he adjusted so as to
pass waves `having mean frequencies yof either
70.0.5 megacycles >or 69.9.5 mega-cycles.
In the arrangement of .Figure l certain decided
advantages obtain. First, it is to be noted that
any „changes in frequency of the ¿local oscillator
29 prove substantially „self-cancelling in the re
sultantoutputrsince waves der-lived from oscillator
2U rare employed in successive heterodyning proc
esses. Thus,` `if the `oscillator' .frequency drifts,
50 _the -dr-ift is first lsubtracted and then added in the
successive heterodyning processes and, hence, the
final output is left unaffected by the drift. By
means of the _frequency .dividers .ha and converter
2b` the resulting 1re-transmitted frequency at ¿42
-- is different than that received.
This 4difference
2,406,932
3
in frequency, when either 499.5 or 500.5 mc. is
re-transmitted, is equal to the frequency of the
output of divider 10. Since the mean output fre
quency of divider 10 depends entirely upon the
received wave, the re-transmitted Wave at 42
always bears a definite fixed relation with respect
to the received wave at 2. The arrangement of
Figure 1, therefore, oiïers a decided advantage
over installations wherein the difference fre’
quency is obtained by an independent local oscil
lation generator whose frequency is entirely inde
4
signed to feed into line 228 498.9 mc. or in case
0.9 mc. is used in line 222, filter 224 may be ar
ranged to pass either a wave having a mean fre
quency of 499.1 mc. or 500.9 mc. The frequency
multiplier 230 may have a multiplying factor of
two or any higher whole number, as desired. As»
suming a multiplying factor of two so that the
frequency multiplier acts as a doubler, then, de
pending upon the input to multiplier 230, the
10 mean frequency of the wave radiated by antenna
' -234 will be 997.8 megacycles or 1002.2 megacycles
pendent of the received or re-transmitted waves.
Figure l may be modified by connecting the
or 998.2 megacycles or 1001.8 megacycles.
In Figure 3, assume that a frequency modulated
input to divider 10, namely, line 0, to transmis
Wave having a mean or carrier frequency of 60 mc.
sion line 44 choosing an appropriate division
factor for the dividing apparatus. In this case,
however, the constancy of the divider output
is received upon the receiving antenna 300. The
received Wave is amplified in amplifier 302 and
fed to a converter or carrier suppression modu
lator 304 which is also supplied with waves hav
ing a mean frequency of .6 mc. through line 306.
in the output circuit of converter 32.
As illustrated in Figure 1, the dividing factor 20 The wave energy in line »306 is derived from the
received signal by means of the frequency dividers
of divider 10 is seen to be 1000. Hence, the out
308 and filters and amplifiers 310. Of the result
put in line 28 will not be a wave of constant fre
ing side bands following from the action of con
quency, but will be a Wave of .5 mc. plus and minus
verter 304 either the upper side band having a
200 cycles, assuming a maximum deviation of
plus and minus .2 mc. in the received waves. This 25 mean frequency of 59.4 mc. may be selected by lil
ter and amplifier 312 or the lower side band hav»
variation in frequency in line 28 may increase or
ing a 'mean frequency of 60.6 mc. The selected
decrease the resultant modulation at retransmit
would depend upon the constancy of the output».
since this is a very small amount relative t0 the
side band is fed through a transmission line 314
to amplifier 316 and then radiated by transmit
cal purposes.
include a frequency multiplier, such as a doubler,
ting antenna 42 by plus and minus 200 cycles, but
signal modulation of plus and minus .2 megacydes 30 ting antenna 318.
In the system of Figure 3, amplifier 316 may
it may be disregarded or neglected for all practi
,
in which case the radiated frequency will have a
The frequency dividers 10 may be of the type
mlean frequency of twice that appearing in line
described in, and follow the principles of fre
quency division of, the patents to M. G. Crosby 35 3 4.
It is to be noted that in both Figures 2 and 3,
Nos. 2,230,231 and 2,230,232. This is not only true
of the divider I0 of Figure l, but is also true of
he frequency dividers used in the other forms
of my present invention about to be described, or,
the retransmitted wave must bear a fixed rela
tionship to the received wave since all changes in
frequency are derived from the received wave and
the dividers may follow the circuits and principles 40 are totally independent of any local oscillation
generator freely operating at its own frequency.
The relay system of Figure 4 is somewhat simi
lar to that shown in Figure 2. The wave fre
In the radio relaying system of Figure 2 assume,
quencies marked upon Figure 4 are given by Way
for example, the received Wave picked up byanf
tenna 200 has a mean frequency of 1000 mega 45 of example and obviously other values may be
chosen. It may be assumed that the incoming
cycles and carries a maximum frequency swing
laid down by G. L. Beers in his U. S. Patent
2,356,201 dated August 22, 1944.
of plus and minus .2 mc. The received waves arel
wave has a mean frequency of 600 megacycles and
that the maximum deviation in frequency pro
fed through line 202 to amplifier 204. Part of the
duced by the strongest modulating signal is plus
amplified waves are fed through line 206 to fre
quency dividers, amplifiers and filters 208 so that 50 and minus 50 megacycles. The wave frequencies
marked on Figure 4 indicate only the mean fre
the mean frequency of the output thereof in line
quencies and do not show the effects of division
210 is one megacycle. This one megacycle output
and multiplication on the deviations which may
is fed to a converter 212 which is also supplied
readily be calculated from the values shown.
with waves having a mean frequency of .1 mc.
through line 214. The Wave energy in line 214 is 55 More specifically, in Figure 4 waves received
upon antenna 400 are amplified at amplifier 402.
derived from the signal and, more specifica ly,
Part of the amplified waves is divided in fre
from amplifier 204 through line 216 and fre
quency dividers 404 and fed to a converter or
quency dividers 218, 220 which may also include
heterodyning detector or modulator 405. A het
amplifying stages.
.
By the action of converter and filter 212, a 60 erodying wave is also fed to the converter 406
through line 408 fed by dividers 410, 412 and 414,
wave of mean frequency of 1.1 mc. is filtered out
in turn energized by wave energy from amplifier
in line 222 which is fed into converter, filter and
402 fed to the input of divider 410 through line
amplifier 224. Converter 224 is also fed withV a
416. Filter 410 selects either the upper or lower
Wave having a mean frequency of 500 mc. de
rived from divider 210. The 500 mc. _wave is fed 65 side band of frequencies produced by converter
400 and the selected band of frequencies is fed to
through line 226 to the converter 224. As a re
frequency multipliers, amplifier and filter 420, in
sult of the converting and filtering action in 224
turn energizing re-transmitting antenna 422.
a wave of mean frequency of 501.1 mc. appears in
Also in Figure 4 it is to be noted that all freely
line 220` which may then be multiplied in fre~
quency multiplier 230 to 1002.2 megacycles, am 70 oscillating oscillators have been eliminated, as a
consequence of which the re«transmitted wave at
plified in amplifier 232 and radiated by way of
422 always bears a definite, fixed relation to the
radiating antenna 234.
frequency of the input Wave received upon receiv
If desired in the modification >0f Figure 2, con
ing antenna 400.
verter and filter 212 may be designed to feed 0.9
The frequency dividers in any of the modiñca
mc. into line 222 and the filter 224 may bede 75
2,406,932 ‘
5
6,
tions described hereinabove vmay >beïmadein ac- z`
energy, frequency. dividing to a greater degreeV
another part of thewave energy, ¿heterodyning
the'divided: energies, filtering the heterodyned
energies and utilizing the .filtered energies;
7. The method which includes frequency di
cordance with’t‘he principles set forth in the pat» `.
ents t0 M. G. Cr0Sby‘..NOS.‘2,230,23l; and“12,230,232
or‘in the copending application of G..~L.. Beers.’
Serial No. 430,588, filed` February 12,1942, now
U. S. Patent 2,356,201. The frequency multipliers
referred to hereinabove may beset upm accord
viding. one portion of alternating wave energy,
frequency dividing to a greater degree- another
portion `of. said Wavev energy, heterodyning the>
divided waves, filtering the heterodyned waves
f andirequency multiplying the filtered waves.
8. .Apparatus for relaying angle modulated'
waves comprising a frequency divider for dividing
ance with the principles set forth inthe patent. to
C. W; Hansell No. 1,878,308. The reactance tube l
frequency i control circuit `may follow ‘the »prin-il
ciples set'forth in the patents `to M. G. Crosby
Nos. 2,279,659, 2,279,660 and. 2,279,661.. `Amplitude
limiting may Vnotonly be usedï inthe final` am»
one portion of the modulated waves, another fre
pli-ner stages, but may .also‘be used in the inter
quency dividerv for frequencydi‘viding to a greater '
medi-ate frequency amplifiers and in. the `‘initial 15.5 degree another portion of the modulated Waves,
amplifiers connected' to thefreceiving antennas
means for heterodynlng the frequency divided
aswell..
`
'
1
`
-‘
'
"
1
Waves, a filter for `>ñltering'the heterodyned Waves,` ‘
‘
Also, it isto be noted where frequency»dividers`
and apparatus for utllizingthe filtered waves.
are‘empl‘oyed, the succeeding iiltersneednot have
9; Apparatus as claimed in claim 8‘ char-‘
a pass` band Wide enough to-‘pass the Vinput to the 291: acterized bypthefact that a frequency multiplier
divider. For example, in» Figuregzfdivider 208'ìdi
is provided for frequency multiplying the filtered
vides. downnot only the mean frequency received
waves.
on antenna.V 202, but also vthe deviation. l This
10. The method of Wave conversion which in
means that the filters in the output of V208 need
be designed to pass only a band of 'frequencies
cludes frequency dividing a portion of electrical
waves to be converted, heterodyning the frequen
cy divided waves and another portion of the Waves
substantially narrower than that vreceivednur'ion
1. The method ofwave conversion- Which inA->
cludes heterodyning Waves. the frequency of
to be converted, filtering the heterodyned Waves',`
frequency multiplying the filtered Waves and
utilizing the frequency multiplied'` wîaves.
1l. A radio relaying system comprising' means
for receiving radio waves, means' for frequency
which is to be changed, to an intermediate fre
dividing one portion of the receivedwaves, means
theantennaZlJû.
‘
f
1*
'
.
Having thus described my invention, what `I
quency, frequency dividing wave energy derived
from said Waves, combining the frequency »di
vided wave energy and the Waves of intermediate
for combining another portion of the. received
Waves with -the frequency divide-d Waves, aïiilte‘r
¿? forl filtering the combinedwaves, and a frequency
frequency and utilizingl the 'resultant Wave energy.
- 2. The method of converting Waves to another
multiplier for frequency multiplying the filtered
Waves.
'I
frequency which includesA heterodyning a part of
the waves to be converted to an intermediate fre
quency, frequency dividing another part of the
12. The method which includes dividing the
frequency of one portion of electrical Waves arid
Waves to be converted to a lower frequency, corn-~
bining the Waves of intermediate frequency andv
waves With 4Waves of different frequency resulting
from frequency divisions of other portions of said
successively heterodyning the frequency divided
thewaves resulting from-the division, selecting
wave energy.
a portion of the combined Waves and heterodyn
ing the selectedvportion to a ‘desired frequency.
3. -In a radio relay system, means for receiving
angular velocity modulated Waves», a frequency di
vider for frequency dividing a part of thev received
dividing one portion of' electrical wave energy to
one frequencyi- frequency dividing another por
tion of'said' ‘electrical wave energy to. another fre~
quency, héterodyn'ing the waves of divided‘fre-i
quericy, filtering the heterodyned WavesV and fre»
quenjcy multiplying the filtered waves.'
ï
Waves, a. source of heterodyning oscillations, 4ap
paratus for combining said hetercdyning oscil~à
lations and another part. of the received waves to
14. In aradio relay system.. means for receiving
waves, a frequeneydivided. for frequency dividing
produce an intermediate frequency, means for>
heterodyn-ing the frequency divided Waves and
a part of the ,received wai/'esa source of hetero-«
the Waves of intermediate frequency, and means
for’ utilizing the last-mentioned heterodyned
waves.
A
dynirigA oscillations, apparatus for combining said
, l heterodyning oscillations and another part ofthe
received waves to produce an intermediate ffre
`
4. In a radio relaying system., means for `receiv
ing angular velocity modulated waves, a source
quency, means‘for heterodyning the frequency
of heterodyningoscillations, means to heterodyne
a part of the received waves with waves from said
'
13. The method which `includes frequency
60 '
source so as to produce an intermediate frequency,
divided Waves andthe waves of intermediate fre
quency, and means for utilizing the lastf-Inen-A
tioned heterodyned waves.
15. VInla radio relaying system, means for re"
a frequency divider for frequency dividing another
part of the received waves, means for combining
ceiving high.` frequency waves, a source of hetero
the divided waves and Waves of intermediate fre
of the received‘waves with waves> from saidfsource
dyning oscillations, means to` heterodyneaï part
quency, meansl for filtering the combined Waves.and means for heterodyning the iiltered'waves to`
" so as. to produce an Vintermediate* frequency, a
a higher frequency with Waves derived Vfrom said' r
part of the received waves, means foi` combining
the» divided waves and waves of intermediate~fre-quency, means for filtering ‘the ‘combined’ waves,
and meansì for heteredyning ‘the filtered Waves to
source.
'
-v
5.‘The method which includes frequc‘encyI di
viding one portion of alternating ivave‘energy,
frequency ‘dividing to a greater degree another
portion of said alternating wave energy, and com
bining the divided energies;
'
`
`
6. The method which includes frequency di
viding `one part Íof alternatingY electrical ‘wave 75
frequency divider`A for frequency dividing another
a higher‘frequency with waves-derived» from said
sourcel
-`
‘
‘
'
`
`
f
16. A relaying system for relaying phase or‘fre
quency»` modulated `Waves comprising a `source off
2,406,932
7
for amplifying waves from said source, a fre
quency divider for frequency dividing a portion
of the output of said amplifier,` a source of sub
stantially constant frequency oscillations, a fre
quency multiplier for frequency multiplying waves
from said source of constant frequency oscilla
tions, a converter for heterodyning together- a’
portion of the output of said multiplier andan
other portion of the output of said amplifier, ap
8
apparatus uitilizing the heterodyned Waves of
higher frequency for re-transmission.
20. A radio relay system comprising a receiv
ing antenna, an amplifier for amplifying Waves
received upon said antenna, a frequency divider
for frequency dividing the output of said ampli
fier, apparatus vfor heterodyning the divided
waves to Waves of another frequency, apparatus
for -heterodyning the- heterodyned waves to a
paratus for amplifying and filtering the output 10 much higher frequency, a frequency multiplier
for frequency 'multiplying said Waves to a much
of said converter, another converter in which the
higher frequency, and a radiating antenna for
output ‘of said last-mentioned amplifier and filter
radiating the frequency multiplied Waves.
and the output of said frequency divider are
21. A radio relay system comprising an antenna
heterodyned together, an amplifier and- filter
for receiving waves to be relayed, an amplifier
coupled to the output of said last-mentioned con
coupled to said antenna, a frequency divider for
verter," another converter `for heterodyning t0
frequency dividing the output of said amplifier,
gether another portion of the output of said fre-V
apparatus for successively heterodyning the out
quency multiplier and the output of said last
put of said frequency divider with frequency
mentioned amplifier and filter, and a filter and
amplifier for filtering and amplifying the output 20 divided Waves also derived from said amplifier
but having higher and lower orders of frequency
of said last-mentioned converter.
division respectively, filtering and amplifying
1'7. A relaying system for phase- or frequency
Waves derived from the last heterodyning means,
modulated waves comprising an antenna for
and utilizing the last-mentioned filtered and am
picking up phase or frequency modulated waves,
an amplifier for amplifying the Waves so picked 25 plified Waves.
22. A radio relay system comprising a receiving
up, a frequency divided for dividing a portion
antenna, an amplifier coupled to said receiving
of the output of said amplifier, a local oscilla
antenna, a frequency divider for dividing a por
tion generator, a frequency multiplier for fre
tion of the output of said amplifier, a first con
quency multiplying the output of said generator,
apparatus for heterodyning a portion of the out 30 verter to which said frequency divided Waves are
fed, a frequency dividing system for frequency
put of said frequency multiplier and another por
dividing to a high orderof frequency division
tion of the output of said‘amplifier, apparatus for
another portion of the output of said amplifier,
amplifying and filtering the output of said hetero
means feeding said highly frequency divided en
dyning apparatus, combining apparatus for com
ergy to said first mentioned converter, apparatus
bining the amplified and filtered output of said
for filtering the output of said converter, a sec
heterodyning apparatus and the output of said
ond converter to which said filtered output is fed,
frequency divider, filtering apparatus coupled to
apparatus for dividing to a relatively small de
the output of said combining apparatus, a con
grec a portion of the output of said amplifier,
verter for heterodyning together the output of
said filtering apparatus and another portion of 40 said output divided to a small degree being fed
to said second converter, a second ñlter for filter
the output; of said frequency multiplier, a filter
ing the output ofl said second converter, a fre
and amplifier coupled to the output of said con
quency multiplier ycoupled to the output of said
verter, and a radiating antenna coupled to the
secondv filter, an amplifier and filter coupled to
output of said filter and amplifier.
18. A relaying system for relaying phase or 45 the output of said frequency multiplier, and a
radiating antenna coupled to the output of said
frequency modulated Waves comprising an an
amplifier and filter.
`
'
tenna for receiving modulated phase or frequency
23. A radio relay system comprising a receiving
modulated waves, an amplifier for amplifying the
antenna, an amplifier for amplifying Waves
waves picked up by said antenna, a series of
frequency dividers for frequency dividing a por 50 picked up by said antenna, a frequency divider
for frequency dividing a portion of the output of
tion of the output of said amplifier, a filler cou
said amplifier, a converter in which an undivided
pled to the final divider, a local generator, a fre
portion of said amplifier and said frequencyv
quency multiplier frequency multiplying the out
divided portion are combined, a filter and am- put of said local generator, a first converter in
Which a portion of the output of said frequency 55 plifier coupled `to the output of said converter,
and a radiating antenna coupled to the output of
multiplier and another portion of the output of
said amplifier are heterodyned together, an am
said filter and amplifier. ,
24. An alternating current system comprising a
receiving antenna, an amplifier coupled to said
output of said first converter, a second converter
in which the filtered output of the first converter 60 antenna, a frequency divider for frequency divid
ing a portion of the output of said amplifier,
and the ñltered output of the last of said series
a series of frequency dividers for frequency di
of dividers is combined, a filter filtering the out
viding to a higher degree another portion of the
put of the second converter, a third converter in
output of said amplifier, a converter in which
which the filtered output of the second converter
and another portion of the output of said fre 65 said divided energies are combined, a filter cou
pled to the output of said converter, and a utiliquency multiplier are heterodyned` together, a
zation circuit coupled to the output circuit of
filtering system for filtering the output of the
said ñlter.
third converter, and> a radiating antenna coupled
25. A relay system for relaying phase or fre
to said filtering system.
quency modulated yWaves comprising a receiving
19. A radio relay system comprising a receiv
antenna, an amplifier coupled to said antenna, a
ing antenna, an amplifier for amplifying waves
frequency divider for frequency dividing a por
received upon said antenna, a frequency divider
tion of the output of said amplifier, a series of
for frequency dividing the output of said am
plifier and filter for amplifying and filtering the
plifier, apparatus for heterodyning the output of
said frequency divider to a higher frequency, and
frequencydividers for frequency dividing to a
higher degree another portion of the output of
2,406,932
9
10
said amplifier, a converter in which said divided
energies are combined, a filter coupled to the
amplifier coupled to the output of said converter
for transmitting and amplifying a, band of sig
naling Waves, and a retransmitting antenna for
output of said conver-ter, frequency multiplying,
amplifyingand filtering apparatus coupled to
the output of said filter, and a re-radiating an
tenna coupled to the output of said frequency
multiplying, amplifying and filtering apparatus.
26. A radio relay comprising a receiving an
tenna, a series of frequency dividers for dividing
transmitting Waves derived from Waves trans
5
mitted by said filter and amplifier.
27. In combination, at a radio relaying station,
a receiving antenna, an amplifier fo-r amplifying
angle modulated Waves received upon said re
ceiving antenna, a series of frequency dividers
down the frequency of a portion of Waves derived 10 for frequency dividing a portion of the output of
from angle modulated Waves picked up by said
said amplifier, a converter for combining another
receiving antenna, circuits and apparatus forV re
portion of amplified waves derived from said am
ducing the mean frequency of another portion
plifier with waves derived from an output cir
of waves derived from angle modulated Waves
cuit of said series of dividers, a filter for filtering
picked up by said receiving antenna, a converter
the output of said converter so as to ytransmit a
for combining the output of the last divider of
band of frequencies, and a transmitting antenna
said series of frequency dividers and the output
energized by Waves derived from waves trans
of the circuits, and apparatus for reducing the
mitted by said filter.
mean frequency yof waves derived from Waves re
HARRY TUNICK.
ceived on the receiving antenna, a, filter and 20
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