[Elecraft] Re: K3 6m pre-amp

[Bob Tellefsen]

Hi John
I've been looking at this circuit for some time.
I have a number of J310s, but no U310s.
Do you know whether they are the same
animal, just in different casings?
73, Bob N6WG

----- Original Message ----- 
From: "John Klewer" <n6ax at speakeasy.net>
To: <elecraft at mailman.qth.net>
Sent: Wednesday, July 30, 2008 10:56 AM
Subject: [Elecraft] Re: K3 6m pre-amp


> Note that I installed this preamplifier in the RX IN/OUT path on the
K3
> rear panel
>
>
>
>
> > To enhance the 6 meter performance of my K3 I built the U310
> > preamplifier as described on N6CA's website:
> >
> > http://www.ham-radio.com/n6ca/50MHz/50appnotes/U310.html
> >
> > Tuned up on an HP8970A noise figure meter it gives 11.2 dB gain
and
> > NF=1.3 dB.
> >
> > The receiver's performance on weak signals was significantly
improved.
> > I already had the parts but cost should not exceed $30.00 to
duplicate
> > this preamp....hard to beat.
> >
> > I have not done measurements on the radio/preamp combination to
> > determine any negative effect on the receiver performance but the
K3,
> > which always performed well in the presence of strong signals,
> > continues to do so.
> >
> >
> > John, N6AX
> >
> > K3 #567
> >
> _______________________________________________
> Elecraft mailing list
> Post to: Elecraft at mailman.qth.net
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com