[Lowfer] Lowfer HK

[lmlangenfeld]

Gents:I clearly saw the SIW EbNaut trace and a bit of something that MAY have been HK last evening. Looking forward to improvements on his end.I may not be hearing quite up to par, as my antennas took a beating in the last icing episode. I have some work to do once we get a bit of warmer weather.Mark -- WA9ETW -- EN52fsSent from my U.S. Cellular® Smartphone
-------- Original message --------From: Garry <k3siw at sbcglobal.net> Date: 2/14/19  7:50 AM  (GMT-06:00) To: lowfer at mailman.qth.net Subject: Re: [Lowfer] Lowfer HK Mike,Yes, that's SIW sending EbNaut on 185.185... kHz and HK weakly above it in frequency. Here HK was at least 10 dB weaker than SIW. It's farther away but not that far. I understand it's using a simple monopole without top hat for the antenna and running a bit over 100 ma RF current. When a top hat is added it should perk up somewhat. Working on lowering ground and tuning inductor loss might raise the antenna current too.As to the EbNaut spectrum, it's sine(x)/x in form with the central band a bit less than 0.5 Hz. I use ARGO at QRSS120 to see the central band and a few sidebands. The bandwidth is specific to the symbol duration (4 sec), number of characters (3), coding (8K19A), and crc (16).  A nice signal calculator is at http://abelian.org/ebnaut/calc.php. The transmission length is 27 min, 44 sec beginning top of hour. After finishing, a carrier is sent until the next top of hour.73, Garry, K3SIW, EN52ta, Elgin, IL______________________________________________________________Lowfer mailing listHome: http://mailman.qth.net/mailman/listinfo/lowferHelp: http://mailman.qth.net/mmfaq.htmPost: mailto:Lowfer at mailman.qth.netPost must be less than 50KB total for message plus attachment!This list hosted by: http://www.qsl.netPlease help support this email list: http://www.qsl.net/donate.html