[Elecraft] K3 receive on .474.2 kHz

[Edward R Cole]

Jim and all:

Quite true.  My poorly constructed sentence lead to a wrong 
conclusion about what I was trying to say.  I was trying to say: "to 
not expect HF world wide skip results on 600m, because ground-wave is 
the predominant propagation mode (there is some sky wave at night 
time which is usually best in winter due to lowest atmospheric noise; 
summer in most regions is accompanied by lots of lightning noise 
being propagated).

On a 70-mile path we made a 3-4 month summer "noon-time" series of 
tests and my 3w ERP signal was receive consistently at +35 or higher 
SNR (via ground wave).  In fact over that path it appears there is 
always ground-wave prop. on 600m.  Lack of a receiving station at 
further distance precluded finding the max range.  Noise floor varied 
from -115 to -100 dBm with Inverted-L antenna to SDR-IQ.

Here in south-central AK there is a notable lack of lightning noise 
in summer (which helps).

I hear NDB (non-directional beacons) out to 1000 miles in the evening 
quite regularly.  The NDB typically run 25-100w to Marconi-T 
antennas.  My 600m amp is a converted NDB driven by my K3 in TEST mode.

73, Ed - KL7UW
saving money to obtain the new SYN boards so I can run down to 472.

----------
Date: Mon, 23 Feb 2015 10:01:13 -0800
From: Jim Brown <jim at audiosystemsgroup.com>
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 receive on .474.2 kHz
Message-ID: <54EB6AE9.8030404 at audiosystemsgroup.com>
Content-Type: text/plain; charset=windows-1252; format=flowed

On Mon,2/23/2015 12:10 AM, Edward R Cole wrote:
 > Most propagation is ground wave which does not extend as far as HF.
 > Best propagation is in winter and at night when a little sky wave is
 > seen.

A clarification. The strength of ground wave propagation increases with
decreasing frequency. The FCC Rules for the AM broadcast band include a
family of graphs for ground wave in groups of a few channels to cover
the band. Ground wave distances on the low end of the band are MUCH
greater than on the high end.

73, Jim K9YC


73, Ed - KL7UW
http://www.kl7uw.com
     "Kits made by KL7UW"
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