Aware as I am that the word ³data² is not the plural of the word ³anecdote,² I can offer a subjective anecdote to the contrary: With the PR6-10 in the RX Ant line of my K3, there are CW signals I can copy (barely) which I cannot hear at all with the preamp out of the circuit, regardless of the RF and AF gain settings. I can¹t explain it and I don¹t have the equipment to do any objective measurements; but it is the case. I have found the pre-amp to be worth the money.
Ted, KN1CBR >------------------------------ > >Message: 25 >Date: Fri, 05 Sep 2014 10:34:17 -0700 >From: Jim Brown <j...@audiosystemsgroup.com> >To: elecraft@mailman.qth.net >Subject: Re: [Elecraft] K3 and preamp >Message-ID: <5409f419.9050...@audiosystemsgroup.com> >Content-Type: text/plain; charset=windows-1252; format=flowed > >On Fri,9/5/2014 9:59 AM, iain macdonnell - N6ML wrote: >> That doesn't justify a pre-amp. If you want more acoustic noise, just >> turn up the AF gain. The only reason (I can see) to use a preamp is if >> the receiver internal noise level is higher than the atmospheric noise >> (coming from the antenna). > >Right. > >> If the noise level perceptibly drops when >> you disconnect the antenna, a preamp isn't going to do much for >> you.... > >Perceptibly is not the right word if you care about weak signal work. >The difference should be at least "twice as loud" when the antenna is >added, which corresponds to about 10 dB. Use the K3's internal audio >voltmeter to determine this. Turn off AGC, with the antenna connected, >calibrate the dB readout to zero following the instructions in the >manual, then remove the antenna. > >73, Jim K9YC > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
