Re: [Elecraft] K3 Below 500 KHz RX Antenna
Phil, as Merv, KH6/K9FD already said do not worry about the special antennas for range below 500kHz if you want to start with just reception. Simply use your current lowbands antenna 160/80m with good preselector (BPF+preamp) and you are on board. I am using this setup for 137kHz and it works well for RX. I can help You with preselector if you want...then let me know off-list. best regards, 73 - Petr, OK1RP - http://ok1rp.blogspot.com -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Below-500-KHz-RX-Antenna-tp7605045p7605108.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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Below 500 KHz RX Antenna
Peter, check my MW stick short tests here: http://topband.blog.cz/1011/mw-stick-vs-half-sloper-antenna-s-test I am using it for several years as no one have enough RX antennas on LB option and it is an interresting option. (do not compare it with Bevs or Hi-Z...) If You are interresting in the documentation, manuals etc. about it then drop me an email off-list. Also I can help you with the PCB... 73 - Petr, OK1RP - http://ok1rp.blogspot.com -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Below-500-KHz-RX-Antenna-tp7605045p7605107.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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Below 500 KHz RX Antenna
Good, Fast, Cheap, pick two. At least that's what I told the General officer who wanted everything. We didn't get the job, thank God. An active E-field probe is probably the optimum, unless you have a lot of room and time. Small mag loops will work too, but often require a preamp 73, Fred K6DGW - Northern California Contest Club - CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015 - www.cqp.org On 7/18/2015 11:52 AM, Phil Hystad wrote: What is the cheapest easiest although effective RX antenna for listening to whatever below 500 KHz with a K3 and the new K3SYNA board? Thanks, 73, phil, K7PEH __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Below 500 KHz RX Antenna
On Sun,7/19/2015 10:20 AM, Merv Schweigert wrote: Dont overlook perhaps an antenna you already have up, Great advice. I use an 80 meter dipole thats fed with open line, I short the open line at the shack and feed that into the receiver, I have copied the east coast many times from Hawaii, and of course all the other guys between, up to Alaska, thats on 475KHZ. Both CW and WSPR. No preamp used. Something like this was my 160M antenna in Chicago. So if your wanting to just listen and get an idea of whats there, maybe check your present set up, coax fed dipole would work the same if you short the coax at the shack end. Yes, except that if there's a choke at the feedpoint, you'll be using only the feedline as the antenna. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Below 500 KHz RX Antenna
Dont overlook perhaps an antenna you already have up, I use an 80 meter dipole thats fed with open line, I short the open line at the shack and feed that into the receiver, I have copied the east coast many times from Hawaii, and of course all the other guys between, up to Alaska, thats on 475KHZ. Both CW and WSPR. No preamp used. So if your wanting to just listen and get an idea of whats there, maybe check your present set up, coax fed dipole would work the same if you short the coax at the shack end. 73 Merv K9FD/KH6 Good, Fast, Cheap, pick two. At least that's what I told the General officer who wanted everything. We didn't get the job, thank God. An active E-field probe is probably the optimum, unless you have a lot of room and time. Small mag loops will work too, but often require a preamp 73, Fred K6DGW - Northern California Contest Club - CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015 - www.cqp.org On 7/18/2015 11:52 AM, Phil Hystad wrote: What is the cheapest easiest although effective RX antenna for listening to whatever below 500 KHz with a K3 and the new K3SYNA board? Thanks, 73, phil, K7PEH __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to k...@flex.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Below 500 KHz RX Antenna
Hi Phil, Ever heard of the pa0rdt mini-whip? Want to know how it performs? Listen to the WEB-sdr at the Twente University made by PA3FWM. It uses such a mini-whip created by PA0RDT. I have one in my backyard, just two metres above the earth on an aluminium pole in a plastic box that formerly contained a HP printer power-supply. I regularly listen to the transmissions of the old Alexanderson alternator in Grimeton Sweden (callsign SAQ) that transmits on 17.2 kHz from time to time but also on all amateur bands up to 28 MHz although the upper limit is stated as 20 MHz. Incredible to be able to receive the alternator on a piece of PCB-copper clad of just a few square centimetres... Ok, SAQ's output is in the order of 200 kW. http://alexander.n.se/ The WEB-sdr can be found here: http://websdr.ewi.utwente.nl:8901/ Mind you it can be very busy ! On Android you should use Mozilla Firefox to listen to it. Info about the pa0rdt-Mini-Whip can be found here: http://pi4utr.nl/wp-content/uploads/download/pa0rdt_whip.pdf The document starts in English but continues in Dutch and Italian. 73, Peter - P0PJE Op 2015-07-18 20:52 schreef Phil Hystad: What is the cheapest easiest although effective RX antenna for listening to whatever below 500 KHz with a K3 and the new K3SYNA board? Thanks, 73, phil, K7PEH P.S. This might have been discussed here before but I must have missed it if it was. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to pa0...@xs4all.nl __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Below 500 KHz RX Antenna
Not only did I find it excellent and informative, it is written like any good technical paper should be - real measurements with both interim results and final conclusions. Unlike many other antenna related articles which simply conclude with look at how many stations I copied without regard for additional analysis. 73, Don W3FPR On 7/18/2015 5:07 PM, Jim Brown wrote: Thanks for this link, Joe. The text contains some EXCELLENT analysis of how electrically short antennas work, AND how noise propagates. This is MUST READING! 73, Jim K9YC On Sat,7/18/2015 1:11 PM, Joe Subich, W4TV wrote: Actually, if you want cheap and effective look at the PA0RDT mini-whip active antenna: http://dl1dbc.net/SAQ/Mwhip/Article_pa0rdt-Mini-Whip_English.pdf __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Below 500 KHz RX Antenna
Actually, if you want cheap and effective look at the PA0RDT mini-whip active antenna: http://dl1dbc.net/SAQ/Mwhip/Article_pa0rdt-Mini-Whip_English.pdf The active antenna is relatively small and easy to build with no particularly expensive or difficult to find parts. Some builders have even used MPF-102 and 2N3866 or 2N3904 transistors instead of the U310 and 2N5109. 73, ... Joe, W4TV On 2015-07-18 3:08 PM, Don Wilhelm wrote: Phil, Cheapest and easiest and effective do not always go together - pick one or two of those properties. Easiest would be a good active antenna, like the one available from Clifton Labs. Cheapest would be a multi-turn loop on a frame - search the web for homebrew designs. - it needs to be rotated, so that may make it a bit more complex, but it can have a narrow field of view which is good for eliminating noise. 73, Don W3FPR On 7/18/2015 2:52 PM, Phil Hystad wrote: What is the cheapest easiest although effective RX antenna for listening to whatever below 500 KHz with a K3 and the new K3SYNA board? __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to li...@subich.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Below 500 KHz RX Antenna
Thanks for all the replies guys… I think I will give the mini-whip mentioned in the message below a try. Something to do when the temps are too high for this Seattle area rain lover. I am printing out the paper linked by the URL at this moment. 73, phil, K7PEH On Jul 18, 2015, at 1:32 PM, Milverton M. Swire via Elecraft elecraft@mailman.qth.net wrote: Joe / Don, my ignorance will jump to the forefront here.How would a Beverage perform in this situation? 73 Milverton / W9MMS. From: Joe Subich, W4TV li...@subich.com To: elecraft@mailman.qth.net Sent: Saturday, July 18, 2015 3:11 PM Subject: Re: [Elecraft] K3 Below 500 KHz RX Antenna Actually, if you want cheap and effective look at the PA0RDT mini-whip active antenna: http://dl1dbc.net/SAQ/Mwhip/Article_pa0rdt-Mini-Whip_English.pdf The active antenna is relatively small and easy to build with no particularly expensive or difficult to find parts. Some builders have even used MPF-102 and 2N3866 or 2N3904 transistors instead of the U310 and 2N5109. 73, ... Joe, W4TV On 2015-07-18 3:08 PM, Don Wilhelm wrote: Phil, Cheapest and easiest and effective do not always go together - pick one or two of those properties. Easiest would be a good active antenna, like the one available from Clifton Labs. Cheapest would be a multi-turn loop on a frame - search the web for homebrew designs. - it needs to be rotated, so that may make it a bit more complex, but it can have a narrow field of view which is good for eliminating noise. 73, Don W3FPR On 7/18/2015 2:52 PM, Phil Hystad wrote: What is the cheapest easiest although effective RX antenna for listening to whatever below 500 KHz with a K3 and the new K3SYNA board? __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to li...@subich.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to tnny...@yahoo.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to phys...@mac.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Below 500 KHz RX Antenna
Milverton, Not practical for LF reception. While the beverage is an excellent and directional receive antenna, it must be at least 1 wavelength long to be effective, longer is better. One needs at least 2 oriented at right angles to cover all directions. At 160 meters, 1 wavelength is about 530 feet - practical on some lots. To have a beverage on 100kHz would require a length of 9540 feet - almost 2 miles. Some ranchers in the US Southwest may have that kind of space available, but not on even a large lot owned by a typical ham. 73, Don W3FPR On 7/18/2015 4:32 PM, Milverton M. Swire via Elecraft wrote: Joe / Don, my ignorance will jump to the forefront here.How would a Beverage perform in this situation? 73 Milverton / W9MMS. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Below 500 KHz RX Antenna
Joe / Don, my ignorance will jump to the forefront here.How would a Beverage perform in this situation? 73 Milverton / W9MMS. From: Joe Subich, W4TV li...@subich.com To: elecraft@mailman.qth.net Sent: Saturday, July 18, 2015 3:11 PM Subject: Re: [Elecraft] K3 Below 500 KHz RX Antenna Actually, if you want cheap and effective look at the PA0RDT mini-whip active antenna: http://dl1dbc.net/SAQ/Mwhip/Article_pa0rdt-Mini-Whip_English.pdf The active antenna is relatively small and easy to build with no particularly expensive or difficult to find parts. Some builders have even used MPF-102 and 2N3866 or 2N3904 transistors instead of the U310 and 2N5109. 73, ... Joe, W4TV On 2015-07-18 3:08 PM, Don Wilhelm wrote: Phil, Cheapest and easiest and effective do not always go together - pick one or two of those properties. Easiest would be a good active antenna, like the one available from Clifton Labs. Cheapest would be a multi-turn loop on a frame - search the web for homebrew designs. - it needs to be rotated, so that may make it a bit more complex, but it can have a narrow field of view which is good for eliminating noise. 73, Don W3FPR On 7/18/2015 2:52 PM, Phil Hystad wrote: What is the cheapest easiest although effective RX antenna for listening to whatever below 500 KHz with a K3 and the new K3SYNA board? __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to li...@subich.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to tnny...@yahoo.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Below 500 KHz RX Antenna
Thanks for this link, Joe. The text contains some EXCELLENT analysis of how electrically short antennas work, AND how noise propagates. This is MUST READING! 73, Jim K9YC On Sat,7/18/2015 1:11 PM, Joe Subich, W4TV wrote: Actually, if you want cheap and effective look at the PA0RDT mini-whip active antenna: http://dl1dbc.net/SAQ/Mwhip/Article_pa0rdt-Mini-Whip_English.pdf The active antenna is relatively small and easy to build with no particularly expensive or difficult to find parts. Some builders have even used MPF-102 and 2N3866 or 2N3904 transistors instead of the U310 and 2N5109. 73, ... Joe, W4TV On 2015-07-18 3:08 PM, Don Wilhelm wrote: Phil, Cheapest and easiest and effective do not always go together - pick one or two of those properties. Easiest would be a good active antenna, like the one available from Clifton Labs. Cheapest would be a multi-turn loop on a frame - search the web for homebrew designs. - it needs to be rotated, so that may make it a bit more complex, but it can have a narrow field of view which is good for eliminating noise. 73, Don W3FPR On 7/18/2015 2:52 PM, Phil Hystad wrote: What is the cheapest easiest although effective RX antenna for listening to whatever below 500 KHz with a K3 and the new K3SYNA board? __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to li...@subich.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to j...@audiosystemsgroup.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Below 500 KHz RX Antenna
Don, Then maybe this article by Pieter-Tjerk de Boer, PA3FWM on this subject might interest you. 73, Peter http://wwwhome.ewi.utwente.nl/~ptdeboer/ham/tn/tn07.html Who he is can be read here: http://wwwhome.ewi.utwente.nl/~ptdeboer/ Op 2015-07-18 23:24 schreef Don Wilhelm: Not only did I find it excellent and informative, it is written like any good technical paper should be - real measurements with both interim results and final conclusions. Unlike many other antenna related articles which simply conclude with look at how many stations I copied without regard for additional analysis. 73, Don W3FPR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Below 500 KHz RX Antenna
Phil, Cheapest and easiest and effective do not always go together - pick one or two of those properties. Easiest would be a good active antenna, like the one available from Clifton Labs. Cheapest would be a multi-turn loop on a frame - search the web for homebrew designs. - it needs to be rotated, so that may make it a bit more complex, but it can have a narrow field of view which is good for eliminating noise. 73, Don W3FPR On 7/18/2015 2:52 PM, Phil Hystad wrote: What is the cheapest easiest although effective RX antenna for listening to whatever below 500 KHz with a K3 and the new K3SYNA board? __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Below 500 KHz RX Antenna
On Sat,7/18/2015 5:20 PM, Jim Brown wrote: After installing my new synth boards in the radio with the KBPF and doing the mods, I tried listening down to 100 kHz. Around mid-day, I had good copy of a CW beacon about 125 miles away. I forgot to note the frequency -- it was around 315 kHz. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Below 500 KHz RX Antenna
If you just want to hear something without regard to directionality then a longish wire on the ground even if the far end is unterminated will work to receive signals. You may need a preamp or just turn on the preamp in the K3. Use the RX antenna input. Simple is good, sometimes good enough. jim ab3cv On Sat, Jul 18, 2015 at 9:08 PM, Milverton M. Swire via Elecraft elecraft@mailman.qth.net wrote: Jim / Don, thanks you both for your input. Albeit brief, I now have food for thought and some bedtime reading to do on Beverage antennas . 73 Milverton / W9MMS. From: Jim Brown j...@audiosystemsgroup.com To: elecraft@mailman.qth.net Sent: Saturday, July 18, 2015 7:20 PM Subject: Re: [Elecraft] K3 Below 500 KHz RX Antenna I don't completely agree with that. I have a pair of 2-wire Beverages that are approximately one wavelength on 160M. I use them on the AM broadcast band and find them quite effective as RX antennas. They are not as directional on the low end of the band, but they still have SOME directivity, and with the DX Eng preamp, they are quite sensitive. After installing my new synth boards in the radio with the KBPF and doing the mods, I tried listening down to 100 kHz. Around mid-day, I had good copy of a CW beacon about 125 miles away. These antennas are too short to be called Beverages at those low frequencies, but they do work well as RX antennas. 73, Jim K9YC On Sat,7/18/2015 2:55 PM, Don Wilhelm wrote: Not practical for LF reception. While the beverage is an excellent and directional receive antenna, it must be at least 1 wavelength long to be effective, longer is better. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to tnny...@yahoo.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to j...@jtmiller.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Below 500 KHz RX Antenna
I don't completely agree with that. I have a pair of 2-wire Beverages that are approximately one wavelength on 160M. I use them on the AM broadcast band and find them quite effective as RX antennas. They are not as directional on the low end of the band, but they still have SOME directivity, and with the DX Eng preamp, they are quite sensitive. After installing my new synth boards in the radio with the KBPF and doing the mods, I tried listening down to 100 kHz. Around mid-day, I had good copy of a CW beacon about 125 miles away. These antennas are too short to be called Beverages at those low frequencies, but they do work well as RX antennas. 73, Jim K9YC On Sat,7/18/2015 2:55 PM, Don Wilhelm wrote: Not practical for LF reception. While the beverage is an excellent and directional receive antenna, it must be at least 1 wavelength long to be effective, longer is better. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Below 500 KHz RX Antenna
Jim / Don, thanks you both for your input. Albeit brief, I now have food for thought and some bedtime reading to do on Beverage antennas . 73 Milverton / W9MMS. From: Jim Brown j...@audiosystemsgroup.com To: elecraft@mailman.qth.net Sent: Saturday, July 18, 2015 7:20 PM Subject: Re: [Elecraft] K3 Below 500 KHz RX Antenna I don't completely agree with that. I have a pair of 2-wire Beverages that are approximately one wavelength on 160M. I use them on the AM broadcast band and find them quite effective as RX antennas. They are not as directional on the low end of the band, but they still have SOME directivity, and with the DX Eng preamp, they are quite sensitive. After installing my new synth boards in the radio with the KBPF and doing the mods, I tried listening down to 100 kHz. Around mid-day, I had good copy of a CW beacon about 125 miles away. These antennas are too short to be called Beverages at those low frequencies, but they do work well as RX antennas. 73, Jim K9YC On Sat,7/18/2015 2:55 PM, Don Wilhelm wrote: Not practical for LF reception. While the beverage is an excellent and directional receive antenna, it must be at least 1 wavelength long to be effective, longer is better. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to tnny...@yahoo.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
