[Elecraft] K3-PR10

[Dave Hachadorian]

I have 6 elements on 10, and the K3 s-meter rests at S-0. When I 
turn the K3's preamp off, I can barely hear a change in antenna 
noise.

Do you have a good choke at the Hex Beam feed point?  If not, 
maybe noise on the outside of your coax is going onto the 
antenna.


Dave Hachadorian, K6LL
Yuma, Arizona





-----Original Message----- 
From: Dale Boresz
Sent: Friday, October 26, 2012 3:00 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3-PR10

Fred,

You must have an enviably quiet QTH (or a very poor antenna) if 
you find
that the K3 can benefit from a preamp on 10m. I work a lot of 
weak
signal CW on 10m with a simple Hex Beam up about 45 feet. Even 
with the
Hex Beam's low gain, I can see the noise floor drop by about 9 
dBm when
I disconnect the antenna from the K3 with the antenna pointed to 
the
quietest part of the sky in the early morning hours when the band 
is
clearly not open. These measurements were taken using both the P3 
and
the K3's built-in AFV amd dBV measurement functionality.

Based upon the above measurements, the band noise is already one 
and a
half S-Units above the receiver's noise floor, so it seems to me 
that in
terms of improving the signal to noise ratio, a preamp would be 
of
little value.

What am I missing here? (perhaps a quieter location  ;-)   )

73, Dale
WA8SRA



On 10/26/2012 4:51 AM, Fred Smith wrote:
> Tim
>
> I can address this a little comparing my FTDX-5000MP and my 
> K3's the k3's
> receivers are not up to the level of the Yaesu 5000 on the high 
> bands. But
> quite the other way around on the low bands in IMHO but 6/10m 
> really needs a
> good preamp for sure.
>
> 73,
> Fred/N0AZZ

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