Pre amp

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Pre amp

Postby Nighthopper 1 » Sun Apr 12, 2015 10:53 pm

Does anyone think a pre amp would help my scanner I'm using a icom r20
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Re: Pre amp

Postby m0lsx » Mon Apr 13, 2015 8:39 am

Pre-Amps can help, but only under very specific conditions & they can also add in one hell of a lot of unwanted problems too. And the Icoms have a really bad reputation for being wide open . That means they already have a problem with rejecting strong signals that you are not listening to. So a strong signal else where in the spectrum or a signal close (in khz) to the signal that you want to hear & these other signals can possibly interfere with what you want to hear because of poor design.
If you then add a little box to your scanner which amplifies every single signal that it can pick up & if it does that ALL THE TIME, then guess what is probably going to happen??. Your listening gets spoilt, or maybe even wiped out.
Talk to someone who wears a hearing aid. A hearing aid & a pre amp have a very similar problem. They do not just amplify the wanted voices they amplify every thing they hear, they simply make everything louder. And that means background noise, people talking else where that you do not want to hear..Everything.
Pre-amplifiers can have a place in a well set up station. Sometimes & if used carefully.
But a better antenna is the best starting place & even that on a Icom can be an issue for some depending upon what they have around them transmitter wise.
Height & even a small gain in height is the biggest help with VHF & UHF. Also with a handheld location is everything. Using my amateur VHF transceiver I cannot open a local repeater from one room, but I can every where else. With one location putting myself between the handheld & the repeater stops access for me & in another location, using my speaker microphone allows me to hold the radio above my head & that makes the difference between opening the repeater & working through it & not even being able to hear it.
So often simple solutions & a little playing around with what you already have can give good results.
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73 De Alan (M0LSX.)
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Re: Pre amp

Postby Nighthopper 1 » Mon Apr 13, 2015 11:47 am

Thanks for your views I think ill do without one
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Re: Pre amp

Postby m0lsx » Mon Apr 13, 2015 12:16 pm

The antenna & the coax you use to connect it to your radio with are the best way to improve reception.
If you just use the standard duck, get something like the Nagoya NA-771. They only cost about £10 delivered & will not add any weight to the radios antenna connection.
Buy a database from Kimmy JS19 via http://ukscanningdirectory.co.uk/
Or do Google search of this forum via http://www.google.com/cse/home?cx=partner-pub-6291336405621919:2662881632
73 De Alan (M0LSX.)
http://www.qrz.com/db/M0LSX"
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Re: Pre amp

Postby Nighthopper 1 » Mon Apr 13, 2015 5:58 pm

Thanks for your help
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