Martin, I installed an ARR P50VDG preamp on the back side of my K3/10 using preamp in/out connectors on the KVX3. photo: http://www.kl7uw.com/K3-ARR-6mPreamp.jpg
I will control the power via the ACC jack when I get a VGA jack. For now it is on when the K3 is on. Much easier and safer than using a bias tee and remote switched preamp. I agree with Lance that you will not likely see any improvement in sensitivity mounting the preamp at the antenna. For keeping loss down use LMR-400 coax for runs up to 100-feet, and LDF4-50A Heliax for longer runs. This keeps transmission losses down, too. 73, Ed - KL7UW I run 80-feet of LMR-400 to my 3-element 6m yagi at 55-feet on the tower. http://www.kl7uw.com/6m.htm ------------------------------ Message: 2 Date: Tue, 27 Apr 2010 16:25:52 +0000 From: Lance Collister <w...@q.com> Subject: Re: [Elecraft] DC-supply for a preamp? To: DM4iM <hamra...@vr-web.de>, Reflector Elecraft <Elecraft@mailman.qth.net> Message-ID: <blu0-smtp74dd81c59bd56fe6e1ba3989...@phx.gbl> Content-Type: text/plain; charset=ISO-8859-1; format=flowed On 4/27/2010 2:32 PM, DM4iM wrote: > Elecrafters, > this might be a rig-killer and vy stupid, but.... > > Can i power a 6m masthead-preamp by feeding dc via choke and coupling > C's to the KXV3A's in/out sockets (where the elecraft preamp is supposed > to sit), or is this a big NONO? > > Martin > Hello Martin, I think you could do better by simply installing the PR6 at the K3 and using low loss coax to the antenna. Almost all the 6m EME stations around the world use a good external preamp in the shack. If your coax cable loss is 1 dB or less, you will not gain anything by mounting the 6m preamp at the antenna. You can model this for yourself in the EME CALCULATOR (accessed from the EME ECHO MODE screen in the old WSJT Version 4). Because the EME CALCULATOR and EME ECHO MODE were never re-written in the language used in more recent revisions of WSTJ, that old version is still available: http://www.physics.princeton.edu/pulsar/K1JT/WSJT498.EXE I think you will find it much simpler to keep the preamp in the shack! GL and VY 73, Lance -- Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX) P.O. Box 73 Frenchtown, MT 59834 USA QTH: DN27UB TEL: (406) 626-5728 URL: http://www.bigskyspaces.com/w7gj LIVE MESSENGER CHAT: w...@hotmail.com 2m DXCC #11, 6m DXCC #815 Interested in 6m EME? Ask me about subscribing to the Magic Band EME email! http://6meme.com/mailman/listinfo/magic_6meme.com 73, Ed - KL7UW, WD2XSH/45 ====================================== BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-600w, 432-100w, 1296-60w, 3400-fall 2010 DUBUS Magazine USA Rep dubus...@hotmail.com ====================================== ______________________________________________________________ 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
