RM KL 203P Linear Amplifier for HAM & CB Radio. Also features 25db receive preamp, on/off switches for TX amp and RX amp and a Tri-colour LED status indicator. UK Time for same-day despatch (Monday to Friday). Maximum input on SSB : 20w (producing 100w output).25db receive preamp (switchable on/off). On/Off toggle switches for TX amp and RX amp (Preamp). 20Mhz - 30Mhz operating frequency.
(Footprint size, excluding controls on the front and connections on the back). 125 mm (4-3/4 inches) Wide. 35 mm (1-1/2 inches) High. 109 mm (4 31/4 inches) Deep. CONSTANT POWER SUPPLY : This amplifier must have power to it all the time it is in line - just switch it OFF if you don't want to use it, but if it is in line it MUST have power to it.
This is because an internal relay closes when the power feed is removed and the transmit signal from your CB will not be allowed through, causing damage to both the CB and amplifier. PREAMP FACILITY : The receive amplifier doesn't know the difference between wanted signals and background noise, so although signals will be stronger, the actual signal to noise ratio is largely unchanged.... Example : without preamp you may be receiving a signal at S7 with a background noise of S3, switch the preamp on and the wanted signal increases to S9 but so does the background noise, to S5.INPUT POWER : Linear amplifiers are called "Linear" because there is a relationship between the amount of input (drive) and the amount of output... THESE AMPLIFIERS GET HOT : The majority of the size of these amps are the heat-sink fins on the top - the job of these is to get hot as dissipate the heat into the air, and they will get pretty damn hot in use, especially with a high power amp like this one.
You need to make sure that there is a free flow of air around these amps - best not to cram them into a small space. YOU NEED A LOW SWR TO USE AN AMP : One of the quickest ways to kill an amplifier like this is to run it into an antenna system that has a high swr... Like the CB's we sell, the output transistor (the bit that can get damaged by a high SWR) is NOT covered by the guarantee as it's the user/installers responsibility to make sure the SWR is low - ideally below 1.5 although you can usually get away with readings upto 1.7 / 1.8 if amplified transmissions are kept short.
More about SWR on our SWR explained guide. BE CAREFUL WHERE YOU USE A HIGH-POWERED AMP LIKE THIS : Please do not use this amplifier is you are within 100 yards of the following : petrol pumps, police/ambulance/fire vehicles or other cb users on the same or adjacent channel to you. You may also find that this amp can set off some older domestic wireless house alarms as well as cause interference/breakthrough on televisions and radios, and even activating peoples outdoor security lights - maybe best switched off when driving through a housing estate for example... Leave the amp for the countryside!
AMPLIFIERS ARE ILLEGAL ON CB : Remember Amplifiers like this are illegal to use on CB Radio, they are designed for Amateur Radio use. A lot of people do use them on CB, and prosecutions are extremely rare and even then only when serious interference or abuse has occurred, but please be mindful of their legality. SSB USE : Single Side Band is a mode of transmission that is now legal in the UK on the European Band (and only the European band) This amplifier can be used on SSB and when used on SSB will take a drive of up to 20w and provide an output of upto 200w peak for that input. Current draw will be around 18-20amps. USING A LOW PASS FILTER : what low pass filters do is cut down whats called the'harmonic radiation' of the amp...This is when the amp produces power on 27mhz it also produces a little bit of power on the multiples of 27mhz, i. 54mhz (27x2), 81mhz (27x3) etc etc. Eventually these frequencies can get up into the bands where old style tv's and radios can be susceptible to interference, TVI etc. In some cases your TV could change channels'on it's own' and remote controlled lights switch on and off. With one of the filters in line that chance (and it is only a chance) of causing interference is reduced.
You'd put it inline immediately after the amp, like this : CB >> AMP >> SWR >> ANTENNA. If you'll be using this amplifier in a base station, with neighbors around you it might be something to think about, but if you're in the middle of nowhere, or using in a vehicle a low pass filter is probably not needed.On the KL203P's instruction sheet they recommend their 27/586 filter... We sell a comparable filter, the Syncron TVI/300NLS you can see. A WORD ABOUT HOW INCREASING OUTPUT POWER WORKS : When using an amplifier, double the power does not mean double the transmission distance.
For every half a signal point increase at the receiving radio you need to double your power, so the largest gains are made fairly low down the scale. For Example : If someone is receiving you at signal 5 when you are using 4w, they'd get you at signal 5.5 with 8w, signal 6 with 16w, signal 6.5 with 32w, signal 7 with 64w, signal 7.5 with 128w, signal 8 with 256w etc etc. So you can see that using this amplifier will give you approximately a 2.25 signal point increase - however this does rely on their signal meter being calibrated which most aren't really so the actual gains you'll see may differ slightly depending on who you're talking to. You can also see that if you were running a 250w amplifier, increasing this to 500w will only get you 0.5 signal point increase - the same as going from 4w to 8w! Items paid for by 3pm UK TIME are sent the same day (Monday to Friday).
Within the UK we send this item by First Class post (usually arrives next day). THIS LINEAR AMPLIFIER IS COMING TO YOU FROM A CB RADIO SPECIALIST. Or anything else to dilute our interests or expertise... JUST CB RADIO GEAR - we.Know the products we sell inside out. And have the knowledge to give you the best after sales support and advice...
We can confidently advise you on. Aspect of our products installation or use. Must i keep this amplifier connected to power, even when not in use? A : Yes, as long as it is connected into the system, it must have power going to it - it has an electronic relay which closes when power is removed - if you try to transmit when the relay is closed you will very soon damage your CB and probably the amplifier too. My CB has been tweaked up to about 6w output on FM - can i still use this amplifier?
A : No, not without reducing the power being fed into the amp - 6w input will soon damage the amp. Q : I have a Kenwood/Yaesu XXX and it's output is 100w...A : No, it doesn't work like that, you'll damage the amp, and probably the radio too - please read all the notes above. Q : How long will it take to arrive?
Central & Southern America, Australasia etc. There are a lot of factors out of our control when sending to these locations.Sadly the postal service in some South American countries is very slow... Please be patient with us...
It is EXTREMELY rare for a tracked parcel to go missing... Occasionally delayed but always delivered. We have recently (late July 2017) seen a sharp increase in delayed items to the USA, i believe this is due to increased security measures dealing with parcels coming into the country. Q : How quickly do you send these out?
We post every weekday Monday to Friday. To be fair to everybody. We have been specialist retailers of CB radio since 1996. The item "RM KL203P 20-30MHz 100/200w Linear Amplifier Burner + PreAmp AM FM SSB CW CB HF" is in sale since Monday, September 28, 2015. This item is in the category "Mobile Phones & Communication\Radio Communication Equipment\Ham/Amateur Radio\Ham Radio Amplifiers".
The seller is "communicationeleven" and is located in Dorking, Surrey. This item can be shipped worldwide.