I am reviewing Jim's (K9YC) slides and have gotten to the DC Power Supply (forget the slide #s) . I currently have a Alinco DM-330MV which supplies my needs. However, after looking internally and studying the schematics, there is no way to isolate circuit return (negative) from the chassis case ground. Unless I had some insulated, plastic grommet type washers that would hold/isolate the 6 mounting screw heads above (and the threads thru the PCB holes) the circuit return PCB Trace that physically & electrically attach the PCB to the chassis. There is an internal jumper connecting the DC Neg connector to the chassis but without isolating the circuit board return traces from the chassis I'm spinning my wheels. If I read Jim's comments right I just do his slide steps 1 & 2 and accept the chassis ground on the DC negative connector? Thanks for any experienced advice. Tom, NB5Q
On Fri, Apr 24, 2020, 10:08 Edward R Cole <kl...@acsalaska.net> wrote: > Interesting statement. How did you determine this? > > I brought home from work my professional service monitor and checked > my K3 (SN-4340) s-meter. Except from S0-S1 all other steps were > exactly 6-dB. S9 = -73 dBm as advertised. I didn't bother much > measuring above S9 so cannot comment on linearity in that region. > > I also measured both K3 and KX3 preamps on ON/OFF on 50 & 28 MHz: > <http://www.kl7uw.com/HF.htm>http://www.kl7uw.com/HF.htm > > Note K3 sensitivity using -73 dBm on 50-MHz with internal preamp off > was S8 and S9+5 with internal preamp on. This was using my XG3 as > signal source so it might be slightly inaccurate (+/- 1 dB). I > checked the XG3 with my mw power meter for accurate output at 0 > dBm. Subsequent to these measurements Elecraft came out with the PR6 > to help K3 sensitivity on 10m & 6m and I have not checked whether > that effects s-meter readings (probably). > > You might note that I tested 50-MHz sensitivity using an ARR Gasfet > preamp that has 24-dB gain. It raises baseline noise due to the gain > but I use it for 6m eme. Slightly better than the PR6, but I use > just the PR6 for non-eme use. Built-in bypass connectors on the PR6 > make using the ARR easy to switch in/out. > > 73, Ed - KL7UW > > Date: Fri, 24 Apr 2020 07:48:58 -0400 > From: John Stengrevics <jstengrev...@comcast.net> > To: Morgan Bailey <mbaileyc...@gmail.com> > Cc: Elecraft@mailman.qth.net > Subject: Re: [Elecraft] K4 S-meter characteristics > Message-ID: <7373a874-0e11-493c-b404-4315ef3af...@comcast.net> > Content-Type: text/plain; charset=utf-8 > > Agree completely. I find all S meters to be totally inaccurate and > next to useless, including my K3S?. > > > 73, Ed - KL7UW > http://www.kl7uw.com > Dubus-NA Business mail: > dubus...@gmail.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 tknorris0...@gmail.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
