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

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

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

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)