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#1
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RF amplifier for CB frequency - Suggestions needed
Seeker wrote:
Hi, I'm not a ham-radio guy, but I know you all know your stuff and might be able to help me out. Presently I have a transmitter (in a truck) and receiver (Water pump system) set up I use to irrigate a motocross track. The signal is transmitted 1/2mile, parallel to high voltage lines. Frequency is at 27.145MHz and at 1 Watt. Unfortunately the signal reception is intermittant - I'm assuming because of the EMF of the high voltage lines. I have both a really good antenna for the reciever and transmitter. I need a CB amplifier for the transmitter. Perhaps 3 Watts? Preferable w/ a BNC connector and runs off 12Volts. Does anyone know where I can get such a device? if your cb isn't putting out even 3 watt it is defective spend 49 buck on a new cb your operation will be legal and likely cheaper than any amp you could build Thanks, Seeker |
#2
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RF amplifier for CB frequency - Suggestions needed
an_old_friend wrote:
Seeker wrote: Hi, I'm not a ham-radio guy, but I know you all know your stuff and might be able to help me out. Presently I have a transmitter (in a truck) and receiver (Water pump system) set up I use to irrigate a motocross track. The signal is transmitted 1/2mile, parallel to high voltage lines. Frequency is at 27.145MHz and at 1 Watt. Unfortunately the signal reception is intermittant - I'm assuming because of the EMF of the high voltage lines. I have both a really good antenna for the reciever and transmitter. I need a CB amplifier for the transmitter. Perhaps 3 Watts? Preferable w/ a BNC connector and runs off 12Volts. Does anyone know where I can get such a device? if your cb isn't putting out even 3 watt it is defective spend 49 buck on a new cb your operation will be legal and likely cheaper than any amp you could build Thanks, Seeker Just because his Xmitter is only 1 watt doesn't mean there's anything wrong with it. Something you probably don't know and didn't bother to lookup is that 27.145 is a remote control frequency and NOT a voice frequency. Many RC controllers put out less than the voice CBs you're thinking of. It's still illegal to put an external amplifier on the unit, even if the total output power doesn't exceed the maximum allowed for the band. Dennis |
#3
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RF amplifier for CB frequency - Suggestions needed
On Tue, 29 Nov 2005 22:13:27 -0800, Dennis Willson
wrote: an_old_friend wrote: Seeker wrote: Hi, I'm not a ham-radio guy, but I know you all know your stuff and might be able to help me out. Presently I have a transmitter (in a truck) and receiver (Water pump system) set up I use to irrigate a motocross track. The signal is transmitted 1/2mile, parallel to high voltage lines. Frequency is at 27.145MHz and at 1 Watt. Unfortunately the signal reception is intermittant - I'm assuming because of the EMF of the high voltage lines. I have both a really good antenna for the reciever and transmitter. I need a CB amplifier for the transmitter. Perhaps 3 Watts? Preferable w/ a BNC connector and runs off 12Volts. Does anyone know where I can get such a device? if your cb isn't putting out even 3 watt it is defective spend 49 buck on a new cb your operation will be legal and likely cheaper than any amp you could build Just because his Xmitter is only 1 watt doesn't mean there's anything wrong with it. Something you probably don't know and didn't bother to lookup is that 27.145 is a remote control frequency and NOT a voice frequency. Many RC controllers put out less than the voice CBs you're thinking of. It's still illegal to put an external amplifier on the unit, even if the total output power doesn't exceed the maximum allowed for the band. Dennis It is funny how people with problems like this always look to boost transmitter power, which as noted is not legal, and never consider improving the receiver end, which is both legal and more likely to work. Happy trails, Gary (net.yogi.bear) -- At the 51st percentile of ursine intelligence Gary D. Schwartz, Needham, MA, USA Please reply to: garyDOTschwartzATpoboxDOTcom |
#4
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RF amplifier for CB frequency - Suggestions needed
I am also sure that the OP did this post many months ago and it was
flogged over pretty well at the time. (Perhaps with a different subject?) The solution from memory was to setup a better/higher antenna at the pump site and improve the one on the vehicle. Both antennas were also tuned. There was also some discussion about tuning the RX better and maybe lowering its response threshold some. There was also talk about PLI being the main issue. But yes it is kind of strange that a "power increase" tends to be the often suggested solution. I guess it is easy for the mind to work in that way though - bigger equals better. Advertising also seems to concentrate more on these numbers. (I mean look at the stupid use of "megapixels" with digcams, without quoting lens distortion) It would be nice if the world understood that the desired signal has power as does the general noise and/or interferring signal. The trick being to have a ratio or difference between the two "powers" that gives a desired result. eg 10dB for some digital telemetry modes. This of course opens up a whole spectrum of possible fixes, many of which can result in a much larger signal to noise ratios than just increasing RFO! Cheers Bob W5/VK2YQA Gary S. wrote: It is funny how people with problems like this always look to boost transmitter power, which as noted is not legal, and never consider improving the receiver end, which is both legal and more likely to work. Happy trails, Gary (net.yogi.bear) |
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