Radio Receivers

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One Transistor Regenerative Radio Receiver

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1924 rca radiola iii radio receiver nice looking set for display or restoration
$61.00
quality

bell+howell fm tv1 air mw sw1 8 radio 12 band receiver 08m3 with sleeve tested
$19.95
quality

1939 rca victor model 6q4 radio receiver technical info and service data sheet
$13.49
quality

clear electronics pocket man am fm stereo receiver sr 301 vintage rechargeable
$9.99
quality

mid century vintage receiver nordmende tube amplifier hifi 1965 rebuilt radio 65
$698.98
quality

vintage manual mcs series modular component systems stereo receiver owner manual
$3.98
quality

manual reprint for hallicrafters sx 73 r 274 receiver sx73 over 100 pages
$15.90
quality

hallicrafters 5r50 5r51 5r52 receiver photofact
$5.00
quality

pile nice 1920s 1 4 phono jack old ham radio tube wireless receiver audio amp
$4.00
quality

general electric am fm broadcast receiver model 210
$19.99
quality

antique 1924 rca radiola iii regenerative receiver radio item 469
$105.00
quality

morse electrophonic tc 10 stereo receiver 8 track tape player photofact
$6.00
quality

zenith 8at01x 8at02x 8at18x radio receiver photofact
$6.00
quality

sony tfm 9430w radio receiver photofact
$6.00
quality

morse electrophonic rr 777cc stereo receiver photofact
$6.00
quality

morse electrophonic 947 late prod stereo receiver 8 track tape player photofact
$6.00
quality

morse electrophonic 451 stereo receiver 8 track tape player photofact
$6.00
quality

morse electrophonic tc 49c stereo receiver 8 track tape player photofact
$6.00
quality

sony icf 9580w radio receiver photofact
$6.00
quality

sony 8fc 85w radio receiver photofact
$6.00
quality

sony sta 38a radio receiver photofact
$6.00
quality

zenith r462 radio receiver photofact
$6.00
quality

hitachi ks 1220h radio receiver photofact
$6.00
quality

hitachi k 760h radio receiver photofact
$6.00
quality

morse electrophonic 942 p stereo receiver 8 track tape player photofact
$6.00
quality

sony icf c21w radio receiver photofact
$6.00
quality

sony icf c33w radio receiver photofact
$6.00
quality

morse electrophonic fr610 stereo receiver 8 track tape player photofact
$6.00
quality

zenith c430w radio receiver photofact
$6.00
quality

morse electrophonic tr 942 p stereo receiver 8 track tape player photofact
$6.00
quality

pilot 2010 stereo tuner receiver photofact
$6.00
quality

morse electrophonic 600 stereo tuner receiver photofact
$6.00
quality

gte 2300 stereo tuner receiver photofact
$7.50
quality

gte 2400 2600 stereo tuner receiver photofact
$7.50
quality

art deco 1953 wooden the marion bendix radio 5 tube clock am radio receiver
$44.99
quality

bell howell am fm mw sw 9 band world receiver transistor battery radio
$29.00
quality

new unused rca 6dc8 ebf89 f old ham radio tube german european receiver tuner
$0.99
quality

vintage art deco regency monitoradio mr 10 fm receiver tube radio
$49.99
quality

antique kolster 6 tube radio receiver model 6d item 449
$64.50
quality

vintage tozai am fm receiver pocket radio
$9.95
quality

sony all channel transistor tv receiver 5 305uw w case made in tokyo japan
$85.00
quality

antique king radio tube radio receiver model 80 1927
$74.91
quality

vintage collins hammarlund hallicrafters radio receiver tube shield lot of 40
$45.00
quality

philco radio receivers alignments cdrom pdf
$7.99
quality

pile mix 12at7 ecc81 twin triode f old ham radio receiver tube guitar audio amp
$2.25
quality

pile mix 12au7 ecc82 twin triode f old ham radio receiver tube guitar audio amp
$2.00
quality

1930s majestic model 30 screen grid receiver wood cabinet only grigsby grunow
$35.00
quality

nice working pacent everytone a headphones f old ham radio tube 1920s receiver
$11.50
quality

9 mix random bullet knob old ham bakelite table radio tube receiver audio amp
$4.25
quality

vintage eveready a c radio receiver out of model 52 console rare
$69.99
quality

9 aluminum knurled radio receiver amplifier electronic knobs w 2 set screws
$19.95
quality

motorolatube white radio receiver aero vane high efficiency loop works great
$39.99
quality

working 1920s baldwin c headphones f old ham radio tube wireless receiver amp
$6.50
quality

vintage pink gpx am fm stereo personal receiver model a2830 works no earphones
$10.00
quality

vintage science fair globe patrol short wave receiver kit nos 28 206 radio shack
$150.50
quality

21 aluminum knurled radio receiver amplifier electronic knobs
$39.95
quality

new rare 1980s sony walkman fm stereo headphones receiver srf fm1 sealed
$106.25
quality

vintage metal winged receiver amplifier radio knobs lot of 8
$24.95
quality

vintage metal round receiver amplifier radio electronic knobs lot of 7
$19.95
quality

vintage caprice lw6000 portable fm stereo receiver red w belt clip radio
$9.99
quality

panasonic table top am fm broadcast transistor receiver model re 7369
$39.99
quality

motorola broadcast am clock receiver model 57cs1a
$24.99
quality

arvin am clock broadcast receiver model 51r27 parts only
$24.99
quality

zenith am fm broadcast receiver model x334 m
$59.99
quality

nice 1920s aluminum metal sheild can f old ham radio tube receiver tuner amp
$0.99
quality

nice 1920s 8 ohm ceramic power rheostat f old ham radio tube receiver filament
$0.99
quality

new unused ww2 sylvania jan 6v6gt old ham radio tube receiver guitar audio amp
$4.25
quality

nice 440 pf variable capacitor f old ham radio tube crystal set receiver tuner
$9.00
quality

vintage panasonic service manual model rc 615 fm am clock radio receiver
$9.99
quality

vintage panasonic service manual model rc 1087 am clock radio receiver
$9.99
quality

vintage panasonic service manual model rc 720f fm am clock radio receiver
$9.99
quality

majestic broadcast receiver model 5a430 free shipping
$19.99
quality

nice atwater kent surface mount 9746 pot old ham radio tube breadboard receiver
$0.99
quality

david bogen am91 tuner receiver photofact photofacts
$5.00
quality

david bogen rr500 tuner receiver photofact
$5.00
quality

david bogen st442 tuner receiver photofact
$5.00
quality

westinghouse aeriola sr radio receiver with tube in case
$269.00
quality

new rare 1980s sony walkman fm stereo headphones receiver srf fm1 sealed
$24.99
quality

vtg art deco general electric radio receiver marbled bakelite ge brown retro
$69.99
quality

1945 scott radio policy to surpass ad receivers record players
$8.95
quality

vintage rrs mcmartin model tr reading service receiver
$21.00
quality


soviet russian estonian radio receiver globe vintage table souvenire rahu 87 rw
$29.88
quality

vintage hallicrafters s 40b am cw shortwave receiver c early 1950s wh019
$70.00
quality

vintage sailor r 109 nautical ship radio marine receiver green case am fm sw mw
$250.00
quality

zenith transoceanic r7000 2 twelve band receiver working w good band selector
$315.00
quality

vintage monitoradio regency electronics crystal controlled fm receiver
$34.99
quality

national nc 125 shortwave receiver
$20.00
quality

nevsky 402 russian pocket radio receiver box ussr works mw sw am nevski nevskii
$39.95
quality

testedvintage zenith model c 730 am fm walnut wood table tube radio receiver
$100.00
quality

1930 press photo henry egide listens to first police radio receiver in milwaukee
$27.88
quality

philmore 3 tube regneerative receiver 2 bands works fine on bc band
$95.00
quality

vintage hallicrafters s 38b shortwave receiver parts repair steampunk
$24.95
quality

antique hollycrafter hamshort wave radio receiver
$44.99
quality

very nice rare scott 800b tube radio receiver and matching scott tube amplifier
$375.00
quality

hombrew crystal radio receiver good condition
$49.00
quality

soviet ussr russia abava rp 8330 radio receiver transistor vintage rare
$49.00
quality

1933 print ad philps thelephone radio receiver model 630 super inductance
$24.80
quality

antique national radio ags receiver
$1,200.00
quality

receiver transmitter electronic kits vintage vacuum tube unbuilt am radio sets
$40.00
quality

realistic radio shack patrolman sw 60 am fm sw uhf vhf radio receiver 6 band
$45.00
quality

national hro 60 prototype receiver coil storage shelf unit ham radio shortwave
$389.95
quality

very rarerussianussrural auto transistor radio receiverworking 1969y
$149.00
quality

regenerative 3 tube radio receiver
$375.00
quality

vintage sony srf 7 mini portable fm receiver for cfs fm7 radio japan walkman
$299.99
quality

radio waa 1938 marked sender empfnger receiver transmitter electronic device
$130.00
quality

vintage wwii aircraft radio transmitter receiver shell only t 23 arc 5 1107m
$31.49
quality

military radio receiver prr 9 prc 88 ba 399 u vietnam prc 25 m151 m274 prc 77 m1
$29.95
quality

radio receiver 1920s marconi marconiphone gecophone set tube valve
$499.00
quality

r 25 arc 5 radio receiver
$119.99
quality

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Radio Receivers

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Spurious Responses in Radio Receivers by Tymon Hytem-5496

Spurious responses peculiar to super heterodyne receivers only are image frequency signals, signals if intermediate frequency, harmonics of intermediate frequency generated by the second detector and strong signals of twice the intermediate frequency. General spurious responses are cross talk and cross modulation, external cross modulation and noises.

For a receiver using local oscillator frequency above the signal frequency, the image frequency signal is one having frequency above the signal frequency by twice the intermediate frequency. Such an image signal, if permitted to reach the mixer input beats with the local oscillator voltage to produce difference frequency voltage of frequency just equal to the intermediate frequency. The image signal will then get the same treatment by the receiver as does the desired signal to which the receiver is tuned. Hence the image signal produces its own modulation frequency voltage in the output of the receiver in addition to the desired output.

Remedies for image signal responses are providing discrimination of the order of fifty to sixty decibels against the image signal relative to the desired signal .by use of two or more radio frequency tuned circuits preceding the mixer. This suggests the use of one or more stages of radio frequency amplifier preceding the mixer. Further the same signal frequency, the image signal discrimination per tuned circuit increases as the value of intermediate frequency increases. According the intermediate frequency should be chosen as high as possible consistent with the requirement of adjacent channel selectivity. In extreme difficult situations wave traps may be used between the antenna and the mixer input to trap any particular image signal of extremely large strength.

Signals of intermediate frequency if able to reach the mixer input will readily pass through the rest of the receiver and will be heard in the output. Response to such signals of intermediate frequency may be eliminated by many means like by using for the receiver an intermediate frequency, that is away from the frequency of a strong local station, by using one or more stages of radio frequency amplification to provide discrimination to this intermediate frequency signal and by using a wave trap to eliminate a particularly strong intermediate frequency signal.

Harmonics of intermediate frequency are produced by the second detector. If one of these harmonics gets coupled back to the radio frequency stage in appreciable magnitude and further if the receiver is tuned to a signal frequency of twice or thrice the intermediate frequency then an audio beat note will be produced by the heterodyne action. This trouble can be eliminated by using in the second detector output suitable radio frequency filter which completely by passes the radio frequency components and by arranging the layout and wiring of the receiver in such a way as to produce a minimum coupling between the second detector stage and the radio frequency stage.

Tymon Hytem has worked in the electronics feild for the past 15 years. He enjoys helping people decide on electronic gadgets from telephones to XM Radio and choosing the perfect XM Satellite Radio system for their needs.

Article Source: http://www.earticlesonline.com/Article/Spurious-Responses-in-Radio-Receivers/189490

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