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#1
December 16th 05, 10:46 PM
posted to rec.radio.shortwave
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Drake Receivers
In article ,
Telamon wrote: In article R_4of.4765$Kk7.1619@trndny05, HFguy wrote: The sync' detector on my R8B never growls during an extreme fade. It stays locked. It also does DSB in addition to LSB or USB. wrote: The 7030 sync is a bit more versitile that that on the R8B. You can even do DSB reception, or any mixture of LSB and USB. It's hard to explain unless you have used one. However, the Drake gives you more bang for the buck, especially with the weak dollar. We did the test during the day, which is pretty difficult for shortwave. The nice thing about the 7030 sync is it never growled during extreme fading. I see someone else wrote the above and responding to the comment that the 7030+ sync is more flexible than the Drake R8B is wrong. The Drake has selectable sideband sync and the 7030+ does not have this function. Both radios have sync and you can adjust the passband on both but only the Drake can sync to one sideband or the other. The result is the blocking is better on the Drake since you can move the passband and select the side band with the least interference. So, what's the acoustic difference between using 1) an image reject mixer and a broad IF filter and 2) using any sort of product detector and a narrower IF filter? A sideband is a sideband. If the unwanted sideband is xx dB down from the desired signal, does it matter how it's done? Mark Zenier Googleproofaddress(account:mzenier provider:eskimo domain:com) |
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#2
December 17th 05, 11:15 PM
posted to rec.radio.shortwave
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Drake Receivers
Mark Zenier wrote:
In article , Telamon wrote: In article R_4of.4765$Kk7.1619@trndny05, HFguy wrote: The sync' detector on my R8B never growls during an extreme fade. It stays locked. It also does DSB in addition to LSB or USB. wrote: The 7030 sync is a bit more versitile that that on the R8B. You can even do DSB reception, or any mixture of LSB and USB. It's hard to explain unless you have used one. However, the Drake gives you more bang for the buck, especially with the weak dollar. We did the test during the day, which is pretty difficult for shortwave. The nice thing about the 7030 sync is it never growled during extreme fading. I see someone else wrote the above and responding to the comment that the 7030+ sync is more flexible than the Drake R8B is wrong. The Drake has selectable sideband sync and the 7030+ does not have this function. Both radios have sync and you can adjust the passband on both but only the Drake can sync to one sideband or the other. The result is the blocking is better on the Drake since you can move the passband and select the side band with the least interference. So, what's the acoustic difference between using 1) an image reject mixer and a broad IF filter and 2) using any sort of product detector and a narrower IF filter? A sideband is a sideband. If the unwanted sideband is xx dB down from the desired signal, does it matter how it's done? Mark Zenier Googleproofaddress(account:mzenier provider:eskimo domain:com) A good selectable sideband sync' detector uses phase cancellation of the opposite sideband which is more effective than just using a narrow filter and/or passband tuning. The audio is also better when you don't have to use a narrow filter. |
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#3
December 17th 05, 11:47 PM
posted to rec.radio.shortwave
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Drake Receivers
HF Guy - That makes sense. ~ RHF
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#5
December 18th 05, 01:52 PM
posted to rec.radio.shortwave
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Drake Receivers
Kind of what I think too,narrow filter.
cuhulin |
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