K144xv for K3 and noise figure

[Jeff Kinzli N6GQ]

Hi,

I was considering a K144XV for my K3, and noticing the noise figure
listed as "<2db", while the earlier transverters list NF at 0.8db. I'm
wondering how the two compare.

I also wonder if maybe in the future there might be a low-NF xvtr for
the K3? I like the integration idea, but I'm wondering how much of an
issue the seemingly higher NF would be for weak-signal work.

Thanks,

jeff
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[n7ws]

I think additional losses inside the K3 probably account for the higher NF.  But if you're really doing weak signal work the preamp belongs at the antenna anyway.

--- On Thu, 7/2/09, Jeff Kinzli N6GQ <[hidden email]> wrote:

From: Jeff Kinzli N6GQ <[hidden email]>
Subject: [Elecraft] K144xv for K3 and noise figure
To: "Elecraft Reflector" <[hidden email]>
Date: Thursday, July 2, 2009, 6:10 PM

Hi,

I was considering a K144XV for my K3, and noticing the noise figure
listed as "<2db", while the earlier transverters list NF at 0.8db. I'm
wondering how the two compare.

I also wonder if maybe in the future there might be a low-NF xvtr for
the K3? I like the integration idea, but I'm wondering how much of an
issue the seemingly higher NF would be for weak-signal work.

Thanks,

jeff
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[Bill Coleman-2]

On Jul 2, 2009, at 8:10 PM, Jeff Kinzli N6GQ wrote:

> I also wonder if maybe in the future there might be a low-NF xvtr for
> the K3?

I understand that the XV-series of transverters work just dandy with  
the K3. There shouldn't be any reason to design new external  
transverters specifically for the K3.

Also, it seems if you had the internal K144XV, you could use an  
external low-NF preamp akin to the PR6. Pure speculation: perhaps  
there's a PR2 in the works?

Bill Coleman, AA4LR, PP-ASEL        Mail: [hidden email]
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
             -- Wilbur Wright, 1901

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[dwines]

Guys,

Keep in mind that the XV144 stand-alone transverter only covers the bottom
2MHz (144-146) of the band and would be great for weak signal work with
either the K2 or K3 because of its low noise figure higher power whereas the
internal K144XV for the K3 covers the entire 144-148 MHz band but with lower
power and somewhat worse noise figure.

Make your choices according to your needs.

As with other things in life, there are always trade-offs! :^)

Don,
K5DW


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[W8ZN]

I believe with some of the newer firmware, 3.03 and later, the K3 will cover
above 30 MHz which would allow a standard XV144 to cover the full 4 Mhz.
just as the k144xv will. Not sure how much IF rolloff there is but for FM,
I'm sure it's better than any FM only rig!

Terry

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Don Wines
Sent: Thursday, July 02, 2009 11:32 PM
To: Bill Coleman; Jeff Kinzli N6GQ
Cc: Elecraft Reflector
Subject: Re: [Elecraft] K144xv for K3 and noise figure

Guys,

Keep in mind that the XV144 stand-alone transverter only covers the bottom
2MHz (144-146) of the band and would be great for weak signal work with
either the K2 or K3 because of its low noise figure higher power whereas the
internal K144XV for the K3 covers the entire 144-148 MHz band but with lower
power and somewhat worse noise figure.

Make your choices according to your needs.

As with other things in life, there are always trade-offs! :^)

Don,
K5DW


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