K4
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Wayne et all
My only concern before I order a K4 is how it will work with two high power AM transmitters near me. 10KW day,1kw night KVOI south of me and a 50kw day only KUAT AM north of me. At some time, I will need to borrow or rent a k4 for a week and see how it behaves The majority of my operation is between 2-3.5 Mhz, 4 to 7mhz, 7.3-10mhz, 11mhz to14mhz. I also use my radio on most ham bands. I currently use a K3 with all bells and 1000MP The MP seems to handle the intermod better then the k3 The intermod is not caused within the radios but cause by rusty chainlink fence, poor power line grounds etc. My antennas are not the problem. I tried a sharp cutoff filter for everything below 3.5mhz. No positive measurable results. Ralph, W7HSG, AFA9RT 520-444-6610 ______________________________________________________________ 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 Message delivered to [hidden email] |
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Ralph,
You answered your own question although part of your description doesn't logically make sense. If the chain link fence is the source of the mixing, how can your FT-1000 out-perform your K3? If the mixing occurs in the fence (very possible at a dissimilar junction), then that junction generates an unwanted signal in the bands you use. Only disconnecting the antenna from the transceiver will solve that problem. The filter protects the transceiver's front end and has no impact on the fence's mixing capability. I used to work for the company that operates our local (770-KKOB) 50 KW electron emitter. It is line-of-sight from our home. I use a high pass filter in between the antenna and K3 to reduce its impact on 160m. The "standard" MFJ antenna analyzer won't work properly with that much RF in the neighborhood. Living in New Mexico, rust is not a big problem for chain link fences or cars/trucks. However, the 50 KW transmitter is a huge problem for many devices, especially telephones, in the neighborhood. We used to provide a lot of phone line ferrite filters before cell phones became so abundant. It's difficult to solve problems without understanding their causes. Good luck! 73, Bill, K8TE -- Sent from: http://elecraft.365791.n2.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 Message delivered to [hidden email] |
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In reply to this post by Ralph S
I am line-of-sight to a 50kW AM transmitter (at least one, maybe more
co-located at the site). I was using a vertical antenna, which was very good at picking up AM BC signals. I had a problem that the plentiful RF overrode the bias on my K3's T/R switch diodes, causing IMD all over the lower bands. I made a HP filter that cut off at about 2 MHz (I don't operate on 160m) and that cleaned it up. When I switched to a horizontal antenna, the problem went away. Now in addition, I am using a Johnson Matchbox, which is very good at attenuating out-of-band signals. If you have a similar problem and you make a HP filter, note that it has to have power-handling capability so you can transmit through it. The t/r switch and the K3 (and probably in the K4) is before the alternate RX input/output, so you can't just put the filter in the receive path. As someone else pointed out, none of this applies if the IM is being generated by chain-link fences or any other non-linear junctions out there. 73, Victor, 4X6GP Rehovot, Israel Formerly K2VCO CWops no. 5 http://www.qsl.net/k2vco/ On 19/04/2020 22:31, RALPH TURK wrote: > Wayne et all > My only concern before I order a K4 is how it will work with two high power > AM transmitters near me. > 10KW day,1kw night KVOI south of me and a 50kw day only KUAT AM north of me. > At some time, I will need to borrow or rent a k4 for a week and see how it behaves > The majority of my operation is between 2-3.5 Mhz, 4 to 7mhz, 7.3-10mhz, 11mhz to14mhz. > I also use my radio on most ham bands. I currently use a K3 with all bells and 1000MP > The MP seems to handle the intermod better then the k3 > The intermod is not caused within the radios but cause by rusty chainlink fence, poor power line > grounds etc. My antennas are not the problem. I tried a sharp cutoff filter for everything below > 3.5mhz. No positive measurable results. > > Ralph, W7HSG, AFA9RT > 520-444-6610 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 Message delivered to [hidden email] |
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