| Author |
Message |
    
Vernonott
| | Posted on Sunday, December 30, 2001 - 5:58 pm: | 
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I noticed today in a catalog a advertisement for a CB radio with 120 channels.If you are counting the straight 40,USB & LSB I guess that would equal 120 channels.I just don't remember them being advertised like that before. |
Taz
| | Posted on Sunday, December 30, 2001 - 10:06 pm: |
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your right
it includes ssb |
Sqwirl2001
| | Posted on Sunday, December 30, 2001 - 11:10 pm: |
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SSB is just a different mode.It is still a 40 channel radio. |
bruce
| | Posted on Monday, December 31, 2001 - 2:29 am: |
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vern they ran adds like that in the 60's... same junk as the 9.9 db gain 1/2 wave vert. |
SpliffMaster 420
| | Posted on Monday, December 31, 2001 - 10:53 pm: |
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I remember seeing a cb in a department store with "7 watts" on the box in large and bold print.I asked a clerk if I could see the manual,on the back page in the specs I found that the "7 watts" was the audio power.I always wondered how many people bought the radio thinking that they were getting around the 4 watt power limit. |
bruce
| | Posted on Monday, December 31, 2001 - 11:32 pm: |
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spliff i worked for sears in the early 70's and did audio systems as part of the job in thoes days they rated audio " one channel driven at full volume " so a 5 watt rms system ran 40 watts PER channel making it a 80 watt unit. nope it dosnt suprise me at all |
Vernonott
| | Posted on Tuesday, January 01, 2002 - 6:29 pm: |
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bruce ne of the biggest mobile radios (in physical size )I have ever owned came from Sears.I bought it in the mid seventies and I believe it was a Road Talker or something like that.It talked real good but was a pain to mount. |
bruce
| | Posted on Tuesday, January 01, 2002 - 11:24 pm: |
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yep vernonott it was a road talker strangly in the St. Petersburg shop ( florida not USSR ) we did not repair cb radios everything else down to cheap clock radios but not cb sets i still have several roadtalkers nice sets but like a lot of things here they sit in boxes marked TO-ITS. i worked there from 1973 to 1977 when the shop inploded from 45 to less than 20 in six months. Sears lost a lot of its market to the jap sets and we were out of work o well life goes on.
bruce
foot note i lost my hard drive anything anyone sent me before TODAY is lost sorry i cannot retreve it to resend to
radio-doctor@juno.com |
Harpoonman
| | Posted on Thursday, January 03, 2002 - 12:54 pm: |
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Hee, hee, hee, hee...
Could y'all see Bruce in a Sears electronics repair shop in St. Petersburg, Russia???
Harpoonman |
bruce
| | Posted on Friday, January 04, 2002 - 9:19 am: |
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YES COMRAD!!!!!! |
Vernonott
| | Posted on Friday, January 04, 2002 - 8:53 pm: |
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I don't mind outrageous sounding adds if they will perform as stated.Last year when General Motors stated that the new SS Camaro with highway patrol chip would run 172 MPH they were on the money as I have ridden in one and seen it do it,although that will be the last time I ride that fast.I don't mind driving that fast , just don't want to ride that fast again. |
bruce
| | Posted on Friday, January 04, 2002 - 11:07 pm: |
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Vernonott in the 70's a antenna company making rubber ducky antennas ran a add " 189 db gain * "
well all the way at the bottom of the page in very small print after a * was " Over a wet noodle down a 1000 foot well " to this day any time i see adds for antennas i think of that one. I wonder what is the loss in a 1000 foot well? |
Taz
| | Posted on Friday, January 04, 2002 - 11:29 pm: |
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hahahaha lol bruce |
Sarge
| | Posted on Wednesday, January 16, 2002 - 3:05 pm: |
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Radio Shack used to advertise their SSB CB radios back in the mid-1970's as having "120" channels. This was based upon 40 AM channels, 40 Lower Sideband channels, and 40 Upper Sideband channels. Of course this was all just a load of bunk. It was still just a 40-channel radio, but with three transmission modes: AM, LSB, and USB. You wouldn't run SSB on CH 19, just as no one would run AM on CH 16 (well, some would try until they got drowned out by the 12-watt PEP signals). The "120-channels" was just an advertising gimmick to increase sales. The same with Midland's use of "7-watt" output power from the audio amplifier to hoodwink potential buyers. It might be useful in a noisy cab when running an external speaker, but 7-watts of audio is not the same as 7-watts of RF output power. Buyer beware!
The FCC regulations used to specify the RF power limit for CB radios as "5-watts maximum input power to the final RF stage". A maximum of 5-watts input usually resulted in about 3.5-watts of RF output at the antenna jack of a stock Radio Shack CB. Due to circuit inefficiencies it was difficult to achieve much more, but the better quality CB's usually were pretty close to 4-watts. This power measurement technique was from the days of tube-type equipment. The FCC finally updated the regulations with the simplier specification of 4-watts RF output as measured at the antenna jack.
However, for years Radio Shack advertised their CB's as being "5-watts RF power". This is the same inflated advertising as Midland's "7-watts" of audio power. I've noticed in recent years that the "5-watt" claim has been quietly dropped from the Radio Shack catalog.
Out of curiousity, does anyone remember the 12-watt CB walkie-talkie that Radio Shack carried in it's catalog once upon a time? I believe it was around 1976 and it was a 23-channel unit. It was a double-sideband / suppressed carrier design, which made it compatible with standard AM radios but also legal to run at 12-watts RF output per the FCC regulations. It was a novel idea, but the high price hindered sales. I think it disappeared from the Radio Shack line-up after only one year. Just like the Tucker automobile, it was a little too advanced for it's time.
I also remember the word on the street was that Sears-Roebuck CB radios were manufactured by Cobra. The Sears "Roadtalker" CB's were good performing radios that cost less than the Cobra's at the time. But some models were somewhat larger and bulkier than other brands of CB's. Sears also sold the famous Yaesu FRG-7 shortwave receiver under the Sears-Roebuck nameplate for a short period. Same performance as the FRG-7 receiver with the Yaesu nameplate, but at least $100 less. |
bruce
| | Posted on Wednesday, January 16, 2002 - 7:59 pm: |
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yep the 120 ch's was used my sears and radio shack and others. Regency had the best adds in the early 60's they claimed double sideband full carrer for max range and had a range boot switch too. DSB nice mode a lot of arc-5 transmitters were converted to DSB decks in the early 50's the prosses was sometimes called a push-push amp phase generated SSB was also common the central electronis deck used that mothode as did eldico and haillcrafters now all history replaced by the monilithic filters of todays SSB radios. |
Mr_Rf
| | Posted on Friday, January 18, 2002 - 2:28 am: |
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Bruce...FYI
A 1000ft well depth, assuming a perfect cylinder shape 1/4wl diameter at 27MHz, walls having a typical mix of rock and sandstone, and an on-plane measurement taken end-to-end with Roberts dipoles setting 1/2wl outside each openning, RF loss would be about 43.5dB, with an uncertainty of approx. 5.2 dB having a k factor of 2.
Don't ask how I know...i would have to take appropiate actions after telling u!!! lol
Later,
Mr_RF |
bruce
| | Posted on Friday, January 18, 2002 - 7:52 am: |
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after i stop laughing ill let you know Hey do you remember the classic april fools joke where a unnamed ham mag published a story on pasive liner amps? well it seems if you take THICK coax like 4 inch hard line cut it to 1/2 wave and feed it into rg-174 and cut it long enough to reach your antenna the ratio of 4 inch hard line to 1/8 inch rg-174 which is 32 your compressing the electrons by a factor of 32 and they would leave the antenna under that much more pressure resulting in a gain in signal being shown at the other stations location for recive a coax you cut the coax the other way or you would show a LOSS of 32 / 1 well let me get back to checking out your theroy ill let you know how your numbers look in my slide ruler
bruce |
SpliffMaster 420
| | Posted on Saturday, January 19, 2002 - 7:13 pm: |
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I might be wrong but I think the RoadTalkers were built for Sears by SBE. |
bruce
| | Posted on Sunday, January 20, 2002 - 1:14 am: |
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i worked for sears and strangly we were not allowed to repair them i guess they worried about the rule only 1st and 2nd class ticket holders could work on them im licensed but was the only one in the tampa district... that law was repealed in the 80's they were and are good radios |
SpliffMaster 420
| | Posted on Monday, January 21, 2002 - 2:00 am: |
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Bruce
Do you know if SBE built the RoadTalkers? I always assumed this because Sears sold scanners you programmed with a punch card. These were identical to the SBE scanners. |
bruce
| | Posted on Monday, January 21, 2002 - 11:55 am: |
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spiff i could not find anything either way i still have some and looked at them for any kind of ID's on the boards or chips how ever the radios were built in several countrys and you could see they looked diffrent even from the outside. I left sears almost 25 years ago the tampa stores were getting out of selling cb sets right after the 40's came in they saw no large sales ... no money. |
SpliffMaster 420
| | Posted on Monday, January 21, 2002 - 1:40 pm: |
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Thanks for trying Bruce.I would hate to add to all the wrong information already being passed on the air. |
bruce
| | Posted on Tuesday, January 22, 2002 - 12:12 am: |
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no problem no mater who made them mine has ben working since 1978 what more needs to be said. |
