General_Electric_Superadio_FAQ.pdf

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1、The GE SuperRadio FAQ Table of Contents The GE SuperRadio Frequently Asked Questions List .1 Contents.1 General Information.1 Technical Questions.1 Appendix A: Repairs and Modifications.1 Appendix B: Resources and Acknowledgments.2 Side Notes and Related Topics .2 General Information.2 What is the G

2、E Superadio? Does it do shortwave?.2 Where do I find one?.2 Im outside the US. How do I get a Superadio?.2 Im in Australia. Can I get an SR?.3 GE SuperRadio FAQ Technical Information.5 Technical Questions.5 The Superradio III? What happened to II? Or I? .5 Does Radio Shack sell a Superadio?.6 What k

3、ind of performance can I expect from the Superadio? .6 What kind of outside/external antenna can I use for mediumwave? .7 What kind of external antenna(s) can I use for FM?.7 What about those reports I hear of problems with the SR III?.8 I just bought an SR III and it doesnt work!.8 The dial calibra

4、tion on my Superadio is off! .8 My mono earphones dont work right with the SR!.9 Can the Superadio be modified for SCA reception?.9 Is a service manual available?.9 Why doesnt GE put a digital display on the Superadio?.10 Can you add a digital display to the Superadio?.10 GE Superadio FAQ Appendix A

5、: Repairs and Modifications .12 Superadio II Mods .12 Disassembling the Superadio II .12 Fixing the Dial Calibration on the SR II.13 Improved FM Filter Modification, SR II .13 SR II Front End Repair .14 Superadio III Repairs and Modifications.15 Sensitivity Fix for some Superadio IIIs.15 SR III Powe

6、r Switch Fix and Dial Light.16 Comments on SR III Alignment .17 SR III Dial Alignment.19 Food For Thought: SR AM/FM Spectrum Analyzer? .20 GE Superradio FAQAppendix B: Resources and Acknowledgements.22 Acknowledgments and Thanks.23 A Superadio 11/2? The GE #35280C AM/FM/cassette portable.25 The GE S

7、uperRadio FAQ i Table of Contents The Superadio Plus: A Report.26 The GE SuperRadio FAQ ii The GE SuperRadio Frequently Asked Questions List compiled by David C. Moisan, N1KGH April 4th, 2003 In this FAQ, Ive assembled the net.wisdom on one of the most popular radios for AM (mediumwave) and FM DXing

8、, the General Electric Superadio. There were four versions of the radio, and the latter two (II and III) are covered here. Included are several Superadio mods that I know about; if youve modified yours, let me know about it and itll be included here. This FAQ is divided into sections for easier brow

9、sing. A PDF version and a zipped HTML version are also available. I no longer offer the plain text version, due to the difficulties of keeping it in sync with the HTML version. Contents General Information What is the GE Superadio? Does it do shortwave? Where do I find one? Im outside the US. How do

10、 I get a Superadio? Im in Australia. Can I get an SR? Technical Questions The Superadio III? What happened to II? Or I? Does Radio Shack make a Superadio? What kind of performance can I expect from the Superadio? What kind of outside/external antenna can I use for mediumwave? What kind of external a

11、ntenna(s) can I use for FM? What about those reports I hear of problems with the SR III? I just bought an SR III and it doesnt work! The dial calibration on my Superadio is off! My mono earphones dont work right with the SR! Can the Superadio be modified for SCA reception? Is a service manual availa

12、ble? Why doesnt GE put a digital display on the Superadio? Can you add a digital display to the Superadio? Appendix A: Repairs and Modifications Superadio II Disassembling the Superadio II Fixing the Dial Calibration on the SR II Improved FM Filter Modification, SR II SR II Front End Repair The GE S

13、uperRadio Frequently Asked Questions List1 Superadio III Sensitivity Fix for some Superadio IIIs SR III Power Switch Fix and Dial Light Comments on SR III Alignment SR III Dial Alignment Food For Thought: SR AM/FM Spectrum Analyzer? Appendix B: Resources and Acknowledgments Side Notes and Related To

14、pics The Superadio Plus: A Review by Dave Zimmerman A Superadio 11/2? The GE #35280C AM/FM/cassette portable The Carpet Loop: A HighPerformance Indoor Antenna Hooking up radios to your PC General Information What is the GE Superadio? Does it do shortwave? The General Electric Superadio III (abbrevia

15、ted SR III) is an AM (mediumwave)/FM radio designed for longrange, highfidelity listening. Its the radio of choice for many AM and FM DXers. It doesnt do shortwave. What it does do is tune the AM (mediumwave) band from 5301705 KHz and the FM band from 88108 MHz; it doesnt receive FM stereo (nor AM s

16、tereo either). Theres a wide/narrow switch for AM reception. It has an excellent sound system, with a 2way speaker and bass and treble controls. Unlike most AM/FM radios the SR III has additional RF stages, a big (200 mm) ferrite loopstick for AM, and an external antenna jack. Where do I find one? T

17、he GE Superadio is available from many retailers, including Sears and Canadian Tire, among others. Bennett Brothers is at least one mailorder source for the radio; Street price is between $35$55. J price is around $26 + $6 S heres some info from : I often wonder how many GE Superadio II and III sale

18、s Ive responsible for at Bennett Brothers, being I believe the first one to post about their availibility and price there. (they also sell SONY SW sets, but obviously, no one has ever talked them lowering their prices.) If only I got a commission for each Superadio sale stemming from rec.radio.short

19、wave. People who want to visit the store at 30 East Adams should note that store is located directly west (within a 100 feet) on the north side of the street of the Adams the SR III accommodates the expanded AM band. The II does not have a AM wide/narrow filter switch. There are some technical chang

20、es as well; the III uses varactor tuning compared to the II, which uses a conventional variable capacitor. Dave Markson has this to say about the II vs. the III: I have an original Superadio and just bought a SR3 (modified on FM with a 110/280 KhZ IF filter, and SCA by SCS Radio Tech). As for MW, he

21、re are my findings: The SR3 has much better sound.1. Although the SR3 has a wide bandwidth position, it is almost useless, but does increase the highs on local stations. The normal position is close to the bandwidth of the original SR. 2. The SR3 is more sensitive (by a small amount)3. The SR3 has a

22、bout the same selectivity of the original SR, my findings show it a little bit less selective. 4. The SR3 workmanship is not quite as good as the original SR.5. The SR3 is harder to tune. Where as the original SR band was spread out pretty evenly across the dial, the SR3 uses 1/2 the tuning dial to

23、go from 5301000kHz, then crams the rest on the right half of the dial. Tuning the upper portion takes a very steady hand! Calibration is terrible also. 6. Note: I bought a SelectATenna, and it improves reception on both SRs. A GREAT DEAL. Well worth the $40$50 (hmmm, same cost as the SR3.) As for FM

24、, here are my findings: The SR3 has much better sound.1. The original SR is MUCH more sensitive than the SR3. It is possible that this is due to the modifications, but Im not sure. Anyone comment on this? 2. The 110/280 kHz IF filter is a great idea. The SR3 has a stock 180kHz filter.3. Using SCA is

25、 great. I am a little disappointed that there are so few SCA programs in the greater Boston area. Most stations are transmitting data on their subcarriers. SCA requires a very clean local signal. There is no DXing SCA stations. 4. SCS does a very clean, professional mod. No relation to SCS5. The ori

26、ginal Superadio resembles the SR II, except that it has only one speaker; performance is similar Scott Fybush There was a digital Superadio, the Superadio Plus. To paraphrase Dave Zimmerman, this model (#72882) was introduced in 1982, with many of the same GE SuperRadio FAQ Technical Information5 fe

27、atures as the original SR, but with PLL synthesized tuning! No keypad, but there were eight presets for each band, a lighted display, and a 9 kHz/10 kHz tuning step switch in the back. Compared to the analog SR, the performance is close, but with increased noise on AM probably due to synthesizer noi

28、se. For the same reasons, weak FM signals were difficult to lock on to, compared with an analog radio. It was a pricey radio in 1982, at $139.95, which likely made it a quick departure from the market. Daves full review is available elsewhere in the FAQ pages. See also my comments on a digital SR. D

29、oes Radio Shack sell a Superadio? Radio Shack does not sell any rebranded GE radios. They do sell some high performance AM/FM portable radios that are similar. A current model of theirs is the Optimus #12903.; this seems to be the successor to the Optimus #12603, an AM/FM radio and Optimus #12604, w

30、hich is an AM/FM/TVsound radio (which includes the UHF channels, unusual for a TVsound radio.) A report on the #12603 from C.D. Kolyer: I bought this new product offering from Radio Shack, because it looks like and has many features of the GE Superadio III separate Bass and Tweeter speakers, tuned R

31、F on AM and FM, widenormal bandwith switch, external antenna screw terminals, obnoxious topmounted Power switch. Knowing how Radio Shack buys its product designs from others, I believe this is a clone of the Superadio. Like everything electronic in my house, I opened the radio. I found SUPER RADIO P

32、CB TOPSIDE CITY 50496 silkscreened on the PCB. The ferrite bar is 140 mm long, which is not as long as the one mentioned in advertisements for the GE Superadio III at web sites such as Universal Radio or Grove. Im not an experienced DXer, and I usually laugh at Radio Shacks products, but this relati

33、vely inexpensive ($ 59.99) receiver performs very well. Also, remember Radio Shacks return policy (90 days w/o hassle buy one, save the box, test it out, return it if youre disappointed.) I know of no retailer near me who offers the GE Superadio, and I have a problem with restocking fees associated

34、with mail order. Besides, Universal Radio and Grove have a price within pennies of $60.00 for the GE Superadio. Columbia River Consultants has written a review of the RS radio in which the reviewer finds the radio poorly aligned as it comes from the factory. A realignment gave excellent results. The

35、 reviews at What kind of performance can I expect from the Superadio? Compared to the average radio, you will get better reception. In 1994, over a few weeks of listening, I compared the SR II to my Realistic DX400 (with an external antenna), listening both in the day and at night; The GE SuperRadio

36、 FAQ Does Radio Shack sell a Superadio?6 I lived (and still live) directly on the East Coast, 25 miles NE of Boston, Massachusetts. The results: Daytime AM (mediumwave)I found a dramatic improvement. I could regularly get several New Hampshire news/talk stations, including WNVU 900 and WZNN 930, that come in weakly with the DX400, if at all. Not to mention New York stations like WCBS 880 and WNYC 830, plus the stupendous (and, alas, now off the air!) CHSJ 700 in St. Johns, New Brunswick, Canada. The SRs antenna really cuts down the noise that is ev