Hello Andy,
Good to hear from you. As Jim, K9YC mentioned, the antenna with the best powerline noise signal level (B input) would be preferred for the NCC-2 noise canceling to function best. Merry Christmas Tim K3LR From: Andree Schanko [mailto:[email protected]] Sent: Tuesday, December 24, 2024 3:44 AM To: [email protected]; [email protected]; Tim Duffy Subject: Aw: Re: Topband: NCC-2 NCC-1 Hey Tim, thanks for informations and email. I have the NCC2 in my shack, bought via Wimo. I want to phase beverages and my 8 circle. And sometimes i have noise from a powerline nearby on 160m. So I am not sure which is the best noise Pick up antenna for the powerline noise. 73, Merry Christmas and greetings to Sandy Andy DL8LAS -- Gesendet mit der WEB.DE Mail App Am 23.12.24, 20:08 schrieb Tim Duffy <[email protected]>: There are many improvements and changes to the NCC-2 vs. the NCC-1. If you are thinking about an NCC-2 for your shack I suggest you look here: https://www.dxengineering.com/parts/dxe-ncc-2 The specifications rate the unit to 30 MHz. The reviews and documentation are worth looking at as well. AA1K uses SIX NCC units at his 160 station. W0FLS and other topband DXers use the NCC. I have been using the NCC-1 and it's improved version NCC-2 (yes the null is better) for a very long time. I use the NCC-2 to phase two RX antennas for improved performance. I have worked some outstanding DX on 160 that would not be possible without the NCC-2. 73 Tim K3LR CEO DX Engineering -----Original Message----- From: Topband [mailto:[email protected]] On Behalf Of Jim Brown Sent: Monday, December 23, 2024 12:38 PM To: [email protected] Subject: Re: Topband: NCC-2 NCC-1 On 12/23/2024 6:07 AM, Andree DL8LAS via Topband wrote: > Hey,do any of you use an NCC-2 or NCC-1 for antenna phasing or noise reduction? Hi Andy, I own two NCC-1 units (the second is a spare). It is my understanding that the NCC-2 differs only in the switching, providing for the main TX antenna to be used as one of the antennas. The phase shift it provides is most effective below 40M. I made extensive measurements of my first NCC-1 as part of the research for my applications note on phasing a pair of VE3DO loops. It's on my website, k9yc.com/publish.htm I have a pair of the loops spaced 5/8 wave, aimed to EU, my most difficult direction, and confirmed, listening to the known headings to various stations, that it worked exactly as careful EZNEC modeling predicted. Usefulness for noise cancellation is much trickier, depending entirely on the number of sources, their azimuth to you and antennas you can use for sensing and listening, and the physical breadth of the source. The whole practice of nulling a source is effective for a single azimuth heading at a time, and for sources whose radiating antennas (the wires connected to them) are small as a fraction of a wavelength. I've had little success with noise cancellation, thanks to the number and their azimuthal dispersion, but this is entirely dependent on our own individual situation. BTW -- I had to measure the unit I bought to learn anything about it, and did that work in 2017. When I asked DXE a year or two earlier prior to purchase if it would be effective at 50 MHz, they didn't know. 73, Jim K9YC _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
