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, [email protected] wrote:
Message: 8
Date: Sun, 3 Dec 2023 01:48:45 +0000
From: W2HX<[email protected]>
To: Michael Carter<[email protected]>, Elecraft Reflector Reflector
<[email protected]>
Subject: Re: [Elecraft] Noise from KAT500?
Message-ID:
<bl1pr12mb52692d0596aadd969a286e4eb5...@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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