Re: Topband: STEERING
I have a MFJ-1025 and I have seen some past post about using this unit for direction steering using two separate antennas. I am installing a new two wire beverage and wonder if there would be any steering possible using the two inputs from the beverage into the MFJ. I had to ask If you model a single wire Beverage with two sources and no termination, and step the termination through all levels and phases, you will see exactly what is possible. The level will control null depth, the phase will control null position. Null movement is limited, but you can move nulls around a little bit. You can get deep nulls if the level is right, but they do not steer like people think or old articles claim. For example a 1 wl Beverage likes roughly around 160 degrees phase shift (-30 if you flip phase by transposing wire directions) and about a 1.4:1 current ratio from feedpoint to termination. You can make the pattern deeper or more shallow, and move nulls around near the back, but it basically stays about the same overall pattern with varying null depths in the same general areas. This isn't saying it isn't useful to move the nulls around a little, but don't expect to actually steer or narrow the beam. That would take two antenna with some significant physical spacing in wavelengths. _ Topband Reflector Archives - http://www.contesting.com/_topband
Topband: Low band noise
Thank you for those who emailed information. They basically thought the larger windmill arrays did not generate much noise. One test, checking all bands, was from a mobile K3 with a 9 foot whip antenna. Unless the whip was loaded to 1.8 Mhz it may not pick up much noise at one mile. The most probable windmill installation noise source is the inverter. Smaller home/farm 1 phase type may give off more wideband noise. Some are using transformer-less inverters. Noise is ever increasing in many areas. There is a need to monitor noise sources, and installing more directive receiving antennas. http://www.solacity.com/connections.htm Watch the inverter video for more info. Highly informative. http://www.power-one.com/renewable-energy/products/solar/string-inverters/aurora-uno-single-phase/pvi-30363842-north-america/series I have no affiliation with any of the companies. 73-Bruce-K1FZ Getting noise from my NW direction. Does not seem to be local. Started wondering what, at distance, could be causing it. At times it seems to have a rhythm like a motor. There are a lot of power generating wind mills showing up. Checking through Google, they generate DC and convert to 3 phase AC it with an inverter. The frequency and phase of the inverter is controlled with a sample from the power grid. Bruce-K1FZ www.qsl.net/k1fz/beveragenotes.html www.qsl.net/k1fz/pennantnotes.html _ Topband Reflector Archives - http://www.contesting.com/_topband
Topband: 160 condx....2nd CME impact
http://www.spaceweather.com/ 73 Bruce-K1FZ www.qsl.net/k1fz/pennantnotes.html Flag, Pennant, Delta receiving antenna info. _ Topband Reflector Archives - http://www.contesting.com/_topband
Topband: VP9/G7VJR
Michael, G7VJR, is now QRV from VP9. He will be on 160 later. He's running 100 watts. Great CW op. GL - Steve WB6RSE _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: VP9/G7VJR
Yep, I just worked him with my KX3/KPA500 (150 watts to a 45 foot high doublet) on 17 meter CW. Coming in nicely here in California this morning. Jim / W6JHB On Thursday, Feb 20, 2014, at Thursday, 11:27 AM, wb6r...@mac.com wrote: Michael, G7VJR, is now QRV from VP9. He will be on 160 later. He's running 100 watts. Great CW op. GL - Steve WB6RSE _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: 160 condx....2nd CME impact
Interesting! Thanks for sharing, Bruce! 73, Charlie, K4OTV -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Bruce Sent: Thursday, February 20, 2014 2:16 PM To: topband@contesting.com Subject: Topband: 160 condx2nd CME impact http://www.spaceweather.com/ 73 Bruce-K1FZ www.qsl.net/k1fz/pennantnotes.html Flag, Pennant, Delta receiving antenna info. _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
