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#1
July 30th 05, 06:45 PM
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SWR not set.. WIll it hurt my radio?
Hi,
If I'm not able to set the SWR in the trucks that I drive will it hurt the radio or just give me decreased range? |
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#2
July 30th 05, 06:51 PM
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driver:
If the swr is over a 2 to 1, you get into danger of damaging the output finals in the equipment, will also decrease your range. There is always a method to decrease (tune adjust) swr... John "driver42" wrote in message 5... Hi, If I'm not able to set the SWR in the trucks that I drive will it hurt the radio or just give me decreased range? |
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#3
July 30th 05, 06:52 PM
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It depends on how bad the match is. There is a good chance that you'll
be OK. It takes a match of perhaps 5:1 or worse to overheat the transmit output transistor in most CBs. Professor www.telstar-electronics.com driver42 wrote: Hi, If I'm not able to set the SWR in the trucks that I drive will it hurt the radio or just give me decreased range? |
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#4
July 30th 05, 08:27 PM
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"John Smith" wrote in
: driver: If the swr is over a 2 to 1, you get into danger of damaging the output finals in the equipment, will also decrease your range. There is always a method to decrease (tune adjust) swr... John "driver42" wrote in message 5... Hi, If I'm not able to set the SWR in the trucks that I drive will it hurt the radio or just give me decreased range? My problem is that I'll be moving from truck to truck so I wont have time to set the SWR correctly. Most of our trucks have factory installed double antenna's which I'm not too thrilled about. |
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#5
July 30th 05, 08:36 PM
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driver42:
SWR IS controlled by the antenna and feedline, if you company has installed these, they should have had someone set it up which has already adjusted all of that. The output of your radio expects a 50 ohm load, "tuning the antenna" means that the antenna and feedline has been adjusted correctly to present this load to your radio, if they have done their job correctly. In other words, if the person installing, tuning the antenna and feedline has properly adjusted it to present a 50 ohm load ANY RADIO should now be able to hooked up to it with no problems and a low SWR. I suspect you are good to go... John "driver42" wrote in message 5... "John Smith" wrote in : driver: If the swr is over a 2 to 1, you get into danger of damaging the output finals in the equipment, will also decrease your range. There is always a method to decrease (tune adjust) swr... John "driver42" wrote in message 5... Hi, If I'm not able to set the SWR in the trucks that I drive will it hurt the radio or just give me decreased range? My problem is that I'll be moving from truck to truck so I wont have time to set the SWR correctly. Most of our trucks have factory installed double antenna's which I'm not too thrilled about. |
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#6
July 30th 05, 08:36 PM
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My problem is that I'll be moving from truck to truck so I wont have
time to set the SWR correctly. Most of our trucks have factory installed double antenna's which I'm not too thrilled about. If you're using a stock unmodified radio, there will be no worries about a less then optimal antenna. If you're using a racecar CB that's maxxed out, then you have to worry about reflections from the antenna. Remember that a dummy load has perfect SWR. You won't transmit anywhere with that. 1:1 SWR and resonance aren't always the same. I much prefer resonance over an artificially perfect SWR. |
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#7
July 30th 05, 08:44 PM
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driver42:
If you really want to know exactly that the swr is ok, get a "SWR Meter." You may still be able to get one from any radio shack, off ebay, or the radio shop at a truck stop. They range in price for 9.99 to 29.99 and up, and are simple to use and come with instructions. You may wish to have someone show you how to use one, which has used one before. If you get it at radio shack or a radio shop, a guy there should be able to quickly get you up to speed in their usage... Good luck... John "driver42" wrote in message 5... "John Smith" wrote in : driver: If the swr is over a 2 to 1, you get into danger of damaging the output finals in the equipment, will also decrease your range. There is always a method to decrease (tune adjust) swr... John "driver42" wrote in message 5... Hi, If I'm not able to set the SWR in the trucks that I drive will it hurt the radio or just give me decreased range? My problem is that I'll be moving from truck to truck so I wont have time to set the SWR correctly. Most of our trucks have factory installed double antenna's which I'm not too thrilled about. |
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#8
July 30th 05, 08:46 PM
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driver42:
As a side note, most antennas can handle a 100 watts without problem, however, if you are going to run BIG POWER, it would be good to check the specs on the antenna(s) and make sure they will not be damaged by large power input... John "driver42" wrote in message 5... "John Smith" wrote in : driver: If the swr is over a 2 to 1, you get into danger of damaging the output finals in the equipment, will also decrease your range. There is always a method to decrease (tune adjust) swr... John "driver42" wrote in message 5... Hi, If I'm not able to set the SWR in the trucks that I drive will it hurt the radio or just give me decreased range? My problem is that I'll be moving from truck to truck so I wont have time to set the SWR correctly. Most of our trucks have factory installed double antenna's which I'm not too thrilled about. |
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#9
July 30th 05, 09:52 PM
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"John Smith" wrote in
: driver42: As a side note, most antennas can handle a 100 watts without problem, however, if you are going to run BIG POWER, it would be good to check the specs on the antenna(s) and make sure they will not be damaged by large power input... John "driver42" wrote in message 5... "John Smith" wrote in : driver: If the swr is over a 2 to 1, you get into danger of damaging the output finals in the equipment, will also decrease your range. There is always a method to decrease (tune adjust) swr... John "driver42" wrote in message 5... Hi, If I'm not able to set the SWR in the trucks that I drive will it hurt the radio or just give me decreased range? My problem is that I'll be moving from truck to truck so I wont have time to set the SWR correctly. Most of our trucks have factory installed double antenna's which I'm not too thrilled about. Thanks for your input. I dont want a "big" radio. I just want a quality radio. I'm looking at either the PC68ELITE or the PC78ELITE both from Uniden. I had a PC68 about ten years ago that I had tweeked and it was a great unit. I was just on a CB site and I seen that they sell a box that lets you set the SWR from your seat without touching the antenna. The box is plugged inbetween your radio and antenna and then you just use your SWR meter plus the knobs on the box to adjust to the desired level that you want. Are these things any good or are they a gimmick? Thanks, Driver42 |
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#10
July 30th 05, 10:22 PM
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driver42:
Well, without seeing the webpage you are referring to (URL), I am just making an educated guess, I would think it would... John "driver42" wrote in message 5... "John Smith" wrote in : driver42: As a side note, most antennas can handle a 100 watts without problem, however, if you are going to run BIG POWER, it would be good to check the specs on the antenna(s) and make sure they will not be damaged by large power input... John "driver42" wrote in message 5... "John Smith" wrote in : driver: If the swr is over a 2 to 1, you get into danger of damaging the output finals in the equipment, will also decrease your range. There is always a method to decrease (tune adjust) swr... John "driver42" wrote in message 5... Hi, If I'm not able to set the SWR in the trucks that I drive will it hurt the radio or just give me decreased range? My problem is that I'll be moving from truck to truck so I wont have time to set the SWR correctly. Most of our trucks have factory installed double antenna's which I'm not too thrilled about. Thanks for your input. I dont want a "big" radio. I just want a quality radio. I'm looking at either the PC68ELITE or the PC78ELITE both from Uniden. I had a PC68 about ten years ago that I had tweeked and it was a great unit. I was just on a CB site and I seen that they sell a box that lets you set the SWR from your seat without touching the antenna. The box is plugged inbetween your radio and antenna and then you just use your SWR meter plus the knobs on the box to adjust to the desired level that you want. Are these things any good or are they a gimmick? Thanks, Driver42 |
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