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#1
July 17th 03, 08:25 AM
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? RUMOR ? GE Superadio III ? Discontinued ?
FO&A,
The "RUMOR" persists that the GE Superadio III has been discontinued. This week the local Long's Drug Store Photo/Electronics Manager said that the GE-SR-IIIs are no longer available from their distributor. ? Will Thomson CE be offering a GE Superadio IV soon ? NOTE: Thomson Consumer Electronics 'owns' the GE & RCA Radio Brand Names: ? When Can We Expect a 'New' GE Superadio IV ? ? What Can We Expect in a 'New' GE Superadio IV ? ? Or, Is the GE Superadio III the Last of a Kind ? What 'Features' would you want to see in a 'New' GE Superadio IV ? Lets make a List: 1. Digital Display 2. AM Sync Detector 3. Two FM Radio IF's Stereo 180kHz and Mono 110kHz 4. Two AM Radio IF Filters Wide 6kHz and Narrow 3.5kHz 5. RF Gain Control or Local/DX Switch 6. 7. 8. 9. 10. Please, Add Your Wishes to the List  )~ RHF .. .. |
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#2
July 17th 03, 08:54 AM
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"RHF" wrote in message om... FO&A, The "RUMOR" persists that the GE Superadio III has been discontinued. This week the local Long's Drug Store Photo/Electronics Manager said that the GE-SR-IIIs are no longer available from their distributor. ? Will Thomson CE be offering a GE Superadio IV soon ? NOTE: Thomson Consumer Electronics 'owns' the GE & RCA Radio Brand Names: ? When Can We Expect a 'New' GE Superadio IV ? ? What Can We Expect in a 'New' GE Superadio IV ? ? Or, Is the GE Superadio III the Last of a Kind ? Thomson may not be in a big hurry to introduce anything new in the US, what with all the Francophobe sentiments currently extant.. What 'Features' would you want to see in a 'New' GE Superadio IV ? Lets make a List: 1. Digital Display One of the benefits of the Superadio series has been the low noise floor allowing decent DX... making a PLL and digital display would bring up the noise floor and cut the useful sensitivity. They had a digital Superadio back in 1983, called the Superadio Plus. It was a colossal bomb, and it's nearly impossible to find one of them on the used market. I have never seen one on ebay (and I have looked for one). 2. AM Sync Detector 3. Two FM Radio IF's Stereo 180kHz and Mono 110kHz Why would you want a bandpass less than that of the deviation used? FM broadcast deviation is 75 KHz each side of the carrier center frequency, for a total bandwidth used of 150 KHz. A 110 KHz bandwidth filter would cause massive distortion. Mono and stereo FM broadcast signals use the same bandwidth. 4. Two AM Radio IF Filters Wide 6kHz and Narrow 3.5kHz 5. RF Gain Control or Local/DX Switch 6. A dial that tracks, like the SRI and SRII... 7. A case that doesn't resonate and rattle at mid-bass frequencies 8. 9. 10. Please, Add Your Wishes to the List )~ RHF . . |
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#3
July 17th 03, 04:58 PM
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"Brenda Ann" wrote in message ... Why would you want a bandpass less than that of the deviation used? FM broadcast deviation is 75 KHz each side of the carrier center frequency, for a total bandwidth used of 150 KHz. A 110 KHz bandwidth filter would cause massive distortion. Mono and stereo FM broadcast signals use the same bandwidth. However deviation and bandwidth are not the same thing. From Frequency Modulation Theory: http://hyperphysics.phy-astr.gsu.edu...dio/radio.html Amplitude Modulation bandwidth can be considered exactly two times the highest frequency of modulation, while Frequency Modulation bandwidth is described by Bessel Functions that extend much higher than those of Amplitude Modulation. In fact the "FM Advantage" in signal-to-noise ratio stems exactly from spreading the modulation over a greater bandwidth than Amplitude Modulation. BANDWIDTH = 2 X (PEAK DEVIATION + HIGHEST MODULATING FREQUENCY) |
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#4
July 17th 03, 07:25 PM
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BA,
"They had a digital Superadio back in 1983, called the Superadio Plus. It was a colossal bomb, and it's nearly impossible to find one of them on the used market. I have never seen one on ebay (and I have looked for one)." well, Well. WELL ! - - - You just missed a "GE {Digital} Superadio Plus" on eBay . . . This was the Complete Radio + Original Box + Documentation. Read Messages #304 and #305 in the "Long Range" eGroup at YAHOO! GoTo= http://groups.yahoo.com/group/longrange/message/304 GoTo= http://groups.yahoo.com/group/longrange/message/305 NOTE: There are two "GE Superadio" eGroups on YAHOO! * "Long Range" eGroup for "GE Superadio" I-II-IIIs GoTo= http://groups.yahoo.com/group/longrange/ * "GE Superadio III" eGroup GoTo= http://groups.yahoo.com/group/SuperadioIII/ ~ RHF .. .. = = = "Brenda Ann" = = = wrote in message ... "RHF" wrote in message om... FO&A, The "RUMOR" persists that the GE Superadio III has been discontinued. This week the local Long's Drug Store Photo/Electronics Manager said that the GE-SR-IIIs are no longer available from their distributor. ? Will Thomson CE be offering a GE Superadio IV soon ? NOTE: Thomson Consumer Electronics 'owns' the GE & RCA Radio Brand Names: ? When Can We Expect a 'New' GE Superadio IV ? ? What Can We Expect in a 'New' GE Superadio IV ? ? Or, Is the GE Superadio III the Last of a Kind ? Thomson may not be in a big hurry to introduce anything new in the US, what with all the Francophobe sentiments currently extant.. What 'Features' would you want to see in a 'New' GE Superadio IV ? Lets make a List: 1. Digital Display One of the benefits of the Superadio series has been the low noise floor allowing decent DX... making a PLL and digital display would bring up the noise floor and cut the useful sensitivity. They had a digital Superadio back in 1983, called the Superadio Plus. It was a colossal bomb, and it's nearly impossible to find one of them on the used market. I have never seen one on ebay (and I have looked for one). 2. AM Sync Detector 3. Two FM Radio IF's Stereo 180kHz and Mono 110kHz Why would you want a bandpass less than that of the deviation used? FM broadcast deviation is 75 KHz each side of the carrier center frequency, for a total bandwidth used of 150 KHz. A 110 KHz bandwidth filter would cause massive distortion. Mono and stereo FM broadcast signals use the same bandwidth. 4. Two AM Radio IF Filters Wide 6kHz and Narrow 3.5kHz 5. RF Gain Control or Local/DX Switch 6. A dial that tracks, like the SRI and SRII... 7. A case that doesn't resonate and rattle at mid-bass frequencies 8. 9. 10. Please, Add Your Wishes to the List )~ RHF . . |
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#6
July 17th 03, 11:24 PM
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#7
July 18th 03, 01:58 AM
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HI, BA,
check this: http://www.geocities.com/toddemslie/...electivity.htm "Brenda Ann" wrote in message ... "RHF" wrote in message om... FO&A, The "RUMOR" persists that the GE Superadio III has been discontinued. This week the local Long's Drug Store Photo/Electronics Manager said that the GE-SR-IIIs are no longer available from their distributor. ? Will Thomson CE be offering a GE Superadio IV soon ? NOTE: Thomson Consumer Electronics 'owns' the GE & RCA Radio Brand Names: ? When Can We Expect a 'New' GE Superadio IV ? ? What Can We Expect in a 'New' GE Superadio IV ? ? Or, Is the GE Superadio III the Last of a Kind ? Thomson may not be in a big hurry to introduce anything new in the US, what with all the Francophobe sentiments currently extant.. What 'Features' would you want to see in a 'New' GE Superadio IV ? Lets make a List: 1. Digital Display One of the benefits of the Superadio series has been the low noise floor allowing decent DX... making a PLL and digital display would bring up the noise floor and cut the useful sensitivity. They had a digital Superadio back in 1983, called the Superadio Plus. It was a colossal bomb, and it's nearly impossible to find one of them on the used market. I have never seen one on ebay (and I have looked for one). 2. AM Sync Detector 3. Two FM Radio IF's Stereo 180kHz and Mono 110kHz Why would you want a bandpass less than that of the deviation used? FM broadcast deviation is 75 KHz each side of the carrier center frequency, for a total bandwidth used of 150 KHz. A 110 KHz bandwidth filter would cause massive distortion. Mono and stereo FM broadcast signals use the same bandwidth. 4. Two AM Radio IF Filters Wide 6kHz and Narrow 3.5kHz 5. RF Gain Control or Local/DX Switch 6. A dial that tracks, like the SRI and SRII... 7. A case that doesn't resonate and rattle at mid-bass frequencies 8. 9. 10. Please, Add Your Wishes to the List )~ RHF . . |
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#8
July 18th 03, 04:15 AM
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"Mike Maghakian" wrote in message om... HI, BA, check this: http://www.geocities.com/toddemslie/...electivity.htm I have to disagree with him. Yes, various subcarriers are found above 50 KHz, but, as in television, the main modulation goes much higher than that... i.e. the L+R modulation runs to 75 KHz deviation, and restricting the bandpass below that introduces distortion. The way I was taught is: Volume= how FAR the carrier is deviated Pitch (tone)= how FAST the carrier is deviated. It's more complicated than that, but it's a rule of thumb. |
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