I remember those days. I still have my Heath SB-303 and SB-401 pair, both of which run from 117VAC. I didn’t have to get a 12V supply until I started upgrading back around 2000. You might want to invest in a small Astron linear supply (or similar). You will slowly start acquiring equipment that runs on 12 - 13.8VDC, so getting one now would be a good thing. What kind of things? I love my Heath HM102, but modern SWR/Power bridge meters provide so much better info. This is just one example…
73! Jack, W6FB > On Dec 3, 2023, at 1:16 PM, W2HX <w...@w2hx.com> wrote: > > ? 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 <rmcg...@benlomand.net <mailto:rmcg...@benlomand.net>> > Sent: Sunday, December 3, 2023 12:11 PM > To: elecraft@mailman.qth.net <mailto:elecraft@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-requ...@mailman.qth.net wrote: >> Message: 8 >> Date: Sun, 3 Dec 2023 01:48:45 +0000 >> From: W2HX<w...@w2hx.com> >> To: Michael Carter<mike.car...@unh.edu>, Elecraft Reflector Reflector >> <Elecraft@mailman.qth.net> >> 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 > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to w...@w2hx.com <mailto:w...@w2hx.com> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net <http://www.qsl.net/> > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to jackbrin...@me.com <mailto:jackbrin...@me.com> ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
