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Brian Denley wrote: dxAce wrote: No real benefit compared to sideband selectable sync, other than the fact that you have sync. Take for example the R8 and R8A, they both have sync on both sidebands at once, compared to the better sideband selectable sync on the R8B. Drake advertises the R8 and R8A as having 'sideband selectable sync' but you have to use the passband offset to select one side or the other. Certainly not as good as the R8B detector. Interestingly the RX-350 (and some other receivers) give you the choice of both sides, lsb or usb. I guess if there is no adjacent interference, the 'both' choice is OK but I still don't see what the benefit is over a choosing the sync with one sideband. Go back and read it again. -- Brian Denley http://home.comcast.net/~b.denley/index.html |
Brian Denley wrote:
dxAce wrote: No real benefit compared to sideband selectable sync, other than the fact that you have sync. Take for example the R8 and R8A, they both have sync on both sidebands at once, compared to the better sideband selectable sync on the R8B. Drake advertises the R8 and R8A as having 'sideband selectable sync' but you have to use the passband offset to select one side or the other. Certainly not as good as the R8B detector. Interestingly the RX-350 (and some other receivers) give you the choice of both sides, lsb or usb. I guess if there is no adjacent interference, the 'both' choice is OK but I still don't see what the benefit is over a choosing the sync with one sideband. Simple, it is easier to implement and cheaper. |
Well, I did say I wouldn't buy a *new* receiver that lacked sync
detection, but that's not to say that there aren't lots of older receivers (like the Drake R7) that are worth acquiring. If I saw a good deal on an R7, I'd be tempted. However, if I were buying a brand spanking new receiver, I would not consider buying one without sync detection. Especially in the case of tabletops, there's simply *no excuse* for them not to have sync detection now. It'd be like buying a new Mercedes sedan that lacks power steering. Steve |
Michael Lawson wrote: "dxAce" wrote in message ... wrote: Others have told me about how sync detection is so dispensible, but my own ears say otherwise. So who am I supposed to believe....the aforementioned people or my own ears? In this day and age, I personally wouldn't buy a new receiver that lacked sync detection. I'd still take a nice Drake R7 that does not have sync any old day... I'd out dx you in most any situation! Ace, you said you used to have an R-5000. How'd that stack up against your current complement of receivers? I was curious considering your R7 comment above. It was a nice receiver, and it had decent audio. I'm not sure what you mean about my comment regarding the R7. dxAce Michigan USA |
wrote in message oups.com... Most radios have a bit higher distortion when using sync, plus there is always going to be a slight frequency offset. Some radios will growl trying to get the sycn. Throw the audio out on a spectrum analyzer and you might spot a weak tone artifact due to the sync. Use it when it sounds better, otherwise leave it off. Sometimes there is more noise "under" one sideband than the other, so you might use sync and pick the quieter sideband. Adjacent channel splatter would be a good example of noise under one sideband and not the other. I probably use sync a few percent of the time. I still don't under why Lowe used even implemented double sideband sync in the HF-150 if it doesn't do anything over single sync. Why add this feature? For what kind of scenerios?? Lucky |
Lucky wrote: wrote in message oups.com... Most radios have a bit higher distortion when using sync, plus there is always going to be a slight frequency offset. Some radios will growl trying to get the sycn. Throw the audio out on a spectrum analyzer and you might spot a weak tone artifact due to the sync. Use it when it sounds better, otherwise leave it off. Sometimes there is more noise "under" one sideband than the other, so you might use sync and pick the quieter sideband. Adjacent channel splatter would be a good example of noise under one sideband and not the other. I probably use sync a few percent of the time. I still don't under why Lowe used even implemented double sideband sync in the HF-150 if it doesn't do anything over single sync. Why add this feature? For what kind of scenerios?? In essence though, isn't it single sync anyway? Versus the selectable sideband sync that is in the R8B? Can you choose which sideband you will use the sync in on the HF-150? dxAce Michigan USA |
"dxAce" wrote in message ... Lucky wrote: wrote in message oups.com... Most radios have a bit higher distortion when using sync, plus there is always going to be a slight frequency offset. Some radios will growl trying to get the sycn. Throw the audio out on a spectrum analyzer and you might spot a weak tone artifact due to the sync. Use it when it sounds better, otherwise leave it off. Sometimes there is more noise "under" one sideband than the other, so you might use sync and pick the quieter sideband. Adjacent channel splatter would be a good example of noise under one sideband and not the other. I probably use sync a few percent of the time. I still don't under why Lowe used even implemented double sideband sync in the HF-150 if it doesn't do anything over single sync. Why add this feature? For what kind of scenerios?? In essence though, isn't it single sync anyway? Versus the selectable sideband sync that is in the R8B? Can you choose which sideband you will use the sync in on the HF-150? dxAce Michigan USA Not in double sideband mode. But you can choose between USB and LSB sync separately. Lucky |
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It takes a good ear to hear a tone 40db down. You need to listen for
it. |
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