| Author |
Message |
    
Kb5lpa
| | Posted on Wednesday, December 18, 2002 - 11:42 am: | 
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This probably has a simple answer, but why is most of the cb I hear(aside from am) on lower side band? Several of us pondered this last evening and not one of us could come up with an answer.
73 de KB5LPA |
Wildbill
| | Posted on Wednesday, December 18, 2002 - 9:43 pm: |
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It's probably due to the fact that more of the spanish stations run on upper and most of the american stations run the lower portion, don't know why though. |
Tech808
| | Posted on Wednesday, December 18, 2002 - 10:40 pm: |
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Kb5lpa,
Simple, they talk where the most people are for DX contacts.
If more people were talking on the uppers they would be there.
Just my thought's.
Lon
Tech |
Kb5lpa
| | Posted on Thursday, December 19, 2002 - 8:05 am: |
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Figured it was as simple as that. One of the group in the talk-around I participate in speculated that it was because of the relationship to 10 meters and upperside use on that band. We had a really interesting talk about this subject.
73 de KB5LPA |
bruce
| | Posted on Thursday, December 19, 2002 - 11:34 am: |
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Some older SSB radios for 6 meters did not even have lower SSB. And i cant remember on 10 or 6 ever hearing a lower SSB station. But im a FM guy so maby i dont lissen enough!
Bruce |
Marconi
| | Posted on Thursday, December 19, 2002 - 6:30 pm: |
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Hey Bruce, maybe they had an OPP switch.
Marconi |
Dan
| | Posted on Thursday, December 19, 2002 - 7:52 pm: |
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Like alot of things involved with radio, its based on tradition, dating back to when sideband first became widely available in the sixties.
Dan |
de
| | Posted on Thursday, December 19, 2002 - 9:32 pm: |
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Convention, just convention.
Convention states that for everyone to benefit everyone should be on the same page/the same sideband. Otherwise upper will clash with lower and chaos will result.
The convention of CB is to use Lower Sideband. As a former member and officer of the Louisiana Sideband Association many many many moons ago it was Lower Sideband only. I see that the convention has remained the same. |
ryan
| | Posted on Saturday, January 04, 2003 - 11:46 pm: |
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now did the louisiana cops enforce that rule? we all know they run the crime rings and the control of it all at once |
Znut
| | Posted on Sunday, January 05, 2003 - 1:52 pm: |
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On my old TRC-451(Cobra 146 guts) the selector went AM, LSB, USB. I figured most folks were on lower because that was the next position over on the selector!
...I think... |
707
| | Posted on Monday, January 06, 2003 - 2:32 am: |
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I believe the convention of using only one sideband on 11m came about due to the lack of selectivity/rejection or unwanted SSB emission on some CB radios. The radios have always been advertised as having 120 channels, but, in reality, for the most part when the band is open, with all the souped up radios blaring on one sideband, the other is useless at times, or using USB causes interference on the next channel up LSB. The radios are designed to operate nicely if left at factory specs. In other words, if we don't tweak them wrongly, they probably won't splatter or generate unwanted signals. The age-old complaint of "why does this radio only do 50% modulation at factory specs"
Why did LSB become the de facto standard? Who knows? I remember back when we still ran SSB on ch16 in the 70's, we used both sidebands. Seems when 40ch radios finally became the norm, everybody moved to 35-40 and the DXers used LSB and the local talk stayed on USB.
With amateur radio, it's interesting to note that by tradition, 20M and up is Upper Sideband, 40M and below is Lower Sideband. This protocol came about as a matter of convenience in early SSB transceiver design and has remained to this day. And yes - you can operate either sideband legally where phone is allowed. And yes you can operate CW on the phone bands -- but best stay with the protocols or get called a "lid" or worse. |
Dave
| | Posted on Monday, January 06, 2003 - 9:50 pm: |
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S.S.B.
The first citizens band s.s.b.unit was the E.F. Johnson #350 (1965- I still have mine) . It came with 2 channels -16 and 19 . The next units to hit the market were the Regency Imperial a double sideband frequency synthesized unit. The next was the Tram Titan II it was a 1 on 1 xtal unit. Because of the tech.of the times " every one was a little off frequency " from each other.It seamed that L.S.B was the closest that every one could get to communicate with each other. Midland came out with the 13-1880 then the 880/b ( the first cybernett), B&K (COBRA) with the 132,138,139and the race was on finally with the advent of the P.L.L. stablity came about. Also some of the first S.S.B. units had stock variable transmit. THE FEDS PUT A FAST STOP TO THAT! So in a nutshell that is why citizens band has adapted L.S.B. as the standard. Amateur Radio uses 160/80-75/40 for other reasons that were of a tech nature anyone ever own a Tempo-1 that is the reason for the forward/reverse mode S.W.
Dave-19A0061( The 61 call sign issued it the old 19th call district )
k0dpl
HAY 707 Iam still" standing by"
73's |
bruce
| | Posted on Tuesday, January 07, 2003 - 2:08 pm: |
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intresting The regency sets i remember were not SSB but DSB but so is evey AM rig regency DID make SSB sets too. I think the vari transmitt ban was because the .005% window was easly exceded and the FCC would have had a real problem if the CB'ers could have moved say +/- 4khz since that would have in efect ended the channel system. SSB came in in the early 50's collins halicrafters and central electronice were the leaders. I had a phase type SSB ham radio years ago you had to set a bunch of knobs to null out the carrer but it worked realy good! and as for stabilty the old xtal plexer worked just fine its just the PLL is a better systen i dont think stabilty was a problem on most of thoes sets but noise and trash was. Some things just happened because the first sets out their came that way like on 6 meters 99.9% of SSB is upper i cant remember ever hearing a LSB 6 meter signal. SSB has replaced AM on most HF bands because of space and only the cost has kept SSB from replacing AM all together.... I still dont understand what some still see in the old 23's. Don Stoner in 1959 showed you how to build your own CB radio and it was NOT illeagal many early cb radios were stoner clones. Few CB'ers remember the early sets REGIN recivers you could hear stations 5 ch away. They were poor very poor like one of the first i built was a cb-1 heath kit i also built the 10 6 and 2 meter " lunchboxes" too. Makes you wonder with the world of radio changing so fast what the stuff will look like 40 years from now!
Bruce |
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