K3 Diversity use with QRN
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Jorge,
When there is QRN I find that Beverage is the best antenna to use, even though the Inverted-L is better at times. Having both available is great. I have configured the inner knob AF control of the K3 to control BOTH receivers and the outer AF knob to control the audio balance between the main and sub receivers. This can be set up with one of the CONFG settings. So if you are in the diversity mode and one receiver sounds better, you can turn the balance control to get audio to the receiver with the best signal. Or if you want to only use the main receiver and antenna, simply tap the SUB button to quickly get out of the diversity mode. This morning on 160M I heard and worked R1FJM for country #212 with 100 Watts. The combination of the NE/SW Beverage and the Inverted-L made for Q5 copy as the signal faded up and down between my ears with the K3 in the diversity mode. I also heard JT1CO for the first time on the Topband but could only copy Chak on the Inverted-L. I plan to add a N/S Beverage to my collection of antennas. I hope that this helps answer your question. 73 de Rich - K1HTV = = = Date: Fri, 11 Dec 2009 11:45:15 -0200 From: "Jorge Diez - CX6VM" <[hidden email]> Subject: Re: [Elecraft] K3 in diversity mode To: <[hidden email]> Message-ID: <002701ca7a68$2e6726e0$8b3574a0$@[hidden email]> Content-Type: text/plain; charset="us-ascii" Hello, I read very positive information about diversity mode, that you can use two different polarization antennas to better performance, or just the TX antenna and a beverage, right? But I have a doubt. What is the field experience when using the main TX antenna and a beverage and you have a high QRN? Still useful the diversity mode or just is better to RX ONLY in the beverage? Thanks! 73, Jorge ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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I have a "QRM Eliminator" by SEM (a UK firm long gone) awaiting repair and I
wondered how best to use this in conjunction with diversity. It is a phasing unit requiring another small (probably vertical) antenna to pick up local QRN, which is theoretically cancelled using its 3 controls. I think there are other similar products on the market. I'm thinking to combine this with another rx antenna which would then feed the rx port of the second rx on the K3. It needs a little thought. David G3UNA ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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I'm doing something similar. I have a pair of identical Beverages 887' long at 40 degrees azimuth. They're spaced ~1/8 wl apart and staggered ~1/4 wl. I'm feeding both to a MFJ-1025 Noise/Signal Phasing box. The forward lobe is relatively insensitive to phase shifting but you can steer a null to the rearand sides to reduce QRM or QRN by 20-25 dB from a specific direction. I use this as one input to my K3 in diversity and either a RX 4SQ or my transmit antenna for my other diversity antenna. W8JI has a webpage below with a number of useful mods to the 1025: http://www.w8ji.com/mfj-1025_1026.htm The 1025 works reasonably well for this but I'll soon replace it with the DXE NCC-1 which has a better front end and less internal noise. 73, Bill |
Re: K3 Diversity use with QRN
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Thanks to all for the feedback!
Really much appreciated. Hope to test it soon 73, Jorge CX6VM/CW5W -----Mensaje original----- De: [hidden email] [mailto:[hidden email]] En nombre de Bill W4ZV Enviado el: Viernes, 11 de Diciembre de 2009 06:33 p.m. Para: [hidden email] Asunto: Re: [Elecraft] K3 Diversity use with QRN David Cutter wrote: > > I have a "QRM Eliminator" by SEM (a UK firm long gone) awaiting repair and > I > wondered how best to use this in conjunction with diversity. It is a > phasing unit requiring another small (probably vertical) antenna to pick > up > local QRN, which is theoretically cancelled using its 3 controls. I > think > there are other similar products on the market. I'm thinking to combine > this with another rx antenna which would then feed the rx port of the > second > rx on the K3. It needs a little thought. > > David > G3UNA > I'm doing something similar. I have a pair of identical Beverages 887' long at 40 degrees azimuth. They're spaced ~1/8 wl apart and staggered ~1/4 wl. I'm feeding both to a MFJ-1025 Noise/Signal Phasing box. The forward lobe is relatively insensitive to phase shifting but you can steer a null to the rearand sides to reduce QRM or QRN by 20-25 dB from a specific direction. I use this as one input to my K3 in diversity and either a RX 4SQ or my transmit antenna for my other diversity antenna. W8JI has a webpage below with a number of useful mods to the 1025: http://www.w8ji.com/mfj-1025_1026.htm The 1025 works reasonably well for this but I'll soon replace it with the DXE NCC-1 which has a better front end and less internal noise. 73, Bill -- View this message in context: http://n2.nabble.com/K3-Diversity-use-with-QRN-tp4153111p4153609.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.426 / Virus Database: 270.14.98/2552 - Release Date: 12/08/09 07:34:00 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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