[Elecraft] Noise from KAT500?

[W2HX]

?  I don't have any 12v transceivers. This is the only 12 device I have in the shack.
Thanks
Eugene W2HX
Sent from Nine<http://www.9folders.com/>

________________________________
From: Bob McGraw <rmcgraw at benlomand.net>
Sent: Sunday, December 3, 2023 12:11 PM
To: elecraft at mailman.qth.net
Subject: [Elecraft] Noise from KAT500?

Just power it from the transceiver power supply and all will be
resolved.   There is no point in making life complex.

73

Bob, K4TAX


On 12/3/2023 9:52 AM, elecraft-request at mailman.qth.net wrote:
> Message: 8
> Date: Sun, 3 Dec 2023 01:48:45 +0000
> From: W2HX<w2hx at w2hx.com>
> To: Michael Carter<Mike.Carter at unh.edu>, Elecraft Reflector Reflector
>        <Elecraft at mailman.qth.net>
> Subject: Re: [Elecraft] Noise from KAT500?
> Message-ID:
>        <BL1PR12MB52692D0596AADD969A286E4EB587A at BL1PR12MB5269.namprd12.prod.outlook.com>
>
> Content-Type: text/plain; charset="utf-8"
>
> Mike, K8CN wins the cigar!
>
>
>
> The issue is the power supply ? I took some spectrum analyzer plots to 7
>   MHz and you can see what I saw. The set up is spectrum analyzer ->
> KAT500 -> Dummy Load. First picture are two "max hold" traces
> superimposed where the problem can be seen.
>
> https://w2hx.com/x/Elecraft/KAT500/Noise-Issue/KAT500-AC-Power.png
>
> The "lower" trace is what I saw with the kat500 in bypass. The "top"
> trace is with the kat500 inline (auto or manual).
>
>
>
> I then replaced the wall-wart power supply with a 12V battery. And this
> is what I saw for BOTH bypass and inline. Clearly the problem.
>
> https://w2hx.com/x/Elecraft/KAT500/Noise-Issue/KAT500-battery.png
>
> using a battery, the noise is about -80 dBm. Using the wall-wart, in some cases the noise is as high as -60 dBm
>
>
>
> My task now is to either leave it on battery or preferably, find a low noise PS.
>
>
>
> Thanks everyone for the ideas.
>
>
>
> 73 Eugene W2HX
>
> Subscribe to my Youtube Channel:https://www.youtube.com/@w2hx/videos
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