HI Tree, Thanks for your input. I'm leaning towards a 2 element phased vertical array with a quasi-cardioid pattern for my application. it will avoid any phasing box overload issues.
73, Kenny K2KW On Sun, Dec 17, 2023 at 2:12 PM Tree <[email protected]> wrote: > I think the concern about overload is another reason to not consider it. > That box is not designed to handle a strong signal like another transmitter. > > One other solution is to try and come up with a coax length that presents > an out of phase signal at the right amplitude to cancel it out on the 2nd > receiver. I know W8JI has done this on 160. > > I have been successful with in-band receiving on 160 with a loop antenna > about 800 feet away from the TX vertical with the null parked on the TX > antenna. On 20 meters, I have done it with about 500 feet separation. > It's obviously a lot easier with low power (like used in the NAQP). The > K5KA muiti-ops used an all band vertical for RX for the in band radios. > > Tree N6TR > > Tree N6TR > > On Sun, Dec 17, 2023 at 10:41 AM Kenny Silverman <[email protected]> > wrote: > >> Thanks for all the comments, but knowing what the resulting antenna >> pattern seems elusive. >> >> I need in-band RX antenna for a mult station. Typically antenna >> separation, front-to-back and polarization are the main tools for that. >> When I run out of room >> >> I was wondering if phasing from an NCC-2 box is another tool to consider. >> But I don’t want to consider it without knowing what the resulting pattern >> would be. >> >> Many thanks, Kenny K2KW >> >> >> Regards , Kenny >> >> > On Dec 17, 2023, at 1:05 PM, Rick Kunath <[email protected]> wrote: >> > >> > I'm not sure we still understand the intended application of the >> original poster, I know I don't. >> > >> > I've done lots of work with loops and loop arrays phased either >> passively (active or entirely passive external phaser boxes) or actively >> phased via an SDR but none of that would eliminate the need for RX >> protection on the receive antenna and any electronics associated with it. >> So if the OP is trying to get away from any protection from the TX energy, >> I think this is false hope. A loop mounted preamp makes that more >> complicated. And The NCC2 does have options for protection boards for TX >> internally. There are several types available and also internal preamps. >> But it cannot set a specific amplitude and phase angle on the phasing. I >> don't have one and haven't ever had the pleasure of using one, but those >> that do tell me they enjoy them and they work well especially for live >> listening. I do like the idea of having the electronics at the shack end of >> things and as little as possible at the antenna when possible, though >> depending on the specifics you will have VACTROL devices or other >> termination devices at at the antenna with at least some antenna types. >> > >> > Preset patterns and unattended work are another case entirely and this >> is best done with specific phase coherent dual-channel SDRs and a specific >> SDR application. >> > >> > I think doing what the OP might want as I might understand it is >> possible, but I'd like to hear more from him about his hopes for the >> project. >> > >> > Rick Kunath, K9AO >> > >> >> _________________ >> Searchable Archives: http://www.contesting.com/_topband - Topband >> Reflector >> > _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
