[Elecraft] DC-supply for a preamp?

[WILLIS COOKE]

Lance, what kind of coax are you using that only has one dB loss at six meters?  7/8" Heliax would do it, but LMR-400 would not unless you could keep the run under 100 feet.
 Willis 'Cookie' Cooke 
K5EWJ 




________________________________
From: Lance Collister <w7gj at q.com>
To: DM4iM <hamradio at vr-web.de>; Reflector Elecraft <Elecraft at mailman.qth.net>
Sent: Tue, April 27, 2010 11:25:52 AM
Subject: Re: [Elecraft] DC-supply for a preamp?

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: w7gj at 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
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