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searching for a passive receiving shielded loop for medium wave broadcast band

rinus nienhuis All Messages By This Member #16926 searching for a passive? receiving shielded loop for medium wave broadcast band have somebody a design? thanks in advance rinus
Bob, N1KPR All Messages By This Member #16929 I uploaded a triple shield passive loop that is a common monitor antenna for b'cast stations. I use it with a 15-20dB preamp for home entertainment. That gives a signal strength equal to my 160-meter dipole but much quieter. Great for AM DXing. Bob, N1KPR ?? Youtube: N1KPR Youtube: Ham Radio Doctor Engineering, where enigma meets paradox On Sunday, November 6, 2022 at 04:47:58 AM EST, rinus nienhuis via groups.io <dridotcom3@...> wrote: searching for a passive? receiving shielded loop for medium wave broadcast band have somebody a design? thanks in advance rinus
rinus nienhuis All Messages By This Member #16934 Great Bob where can i find it? Regards rinus
Steven Greenfield AE7HD All Messages By This Member #16935 /g/loopantennas/album?id=281378 -- Steve Greenfield AE7HD
rinus nienhuis All Messages By This Member #16936 Thanks Steve and Bob !
Fred Moore All Messages By This Member #16937 Good morning Bob, Do you possibly have the same design for 100khz - 500khz?? Basically I think the only difference would be the wire length and maybe the loop diameter.? Thanks Fred - N4CLA toggle quoted message Show quoted text On Sun, Nov 6, 2022, 11:58 Bob, N1KPR via <rwbetts=[email protected]> wrote: I uploaded a triple shield passive loop that is a common monitor antenna for b'cast stations. I use it with a 15-20dB preamp for home entertainment. That gives a signal strength equal to my 160-meter dipole but much quieter. Great for AM DXing. Bob, N1KPR ?? Youtube: N1KPR Youtube: Ham Radio Doctor Engineering, where enigma meets paradox On Sunday, November 6, 2022 at 04:47:58 AM EST, rinus nienhuis via <dridotcom3=[email protected]> wrote: searching for a passive? receiving shielded loop for medium wave broadcast band have somebody a design? thanks in advance rinus
Bob, N1KPR All Messages By This Member #16938 Hi Fred; It's non-resonant so it acts like the secondary of an air-core transformer. I had a 48" version for LOWFER work (136 and 472 KHz), but really couldn't see enough signal gain to account for the bigger size. Also monitored Cutler (Maine)signals around 24KHz here in Connecticut (W-J8711). I'm currently using an old Rockwell-Collins RDF 650 Aircraft receiver for LOWFER 472. One of the projects is here: ?? Youtube: N1KPR Youtube: Ham Radio Doctor Engineering, where enigma meets paradox On Monday, November 7, 2022 at 11:01:51 AM EST, Fred Moore <n40cla@...> wrote: Good morning Bob, Do you possibly have the same design for 100khz - 500khz?? Basically I think the only difference would be the wire length and maybe the loop diameter.? Thanks Fred - N4CLA toggle quoted message Show quoted text On Sun, Nov 6, 2022, 11:58 Bob, N1KPR via <rwbetts=[email protected]> wrote: I uploaded a triple shield passive loop that is a common monitor antenna for b'cast stations. I use it with a 15-20dB preamp for home entertainment. That gives a signal strength equal to my 160-meter dipole but much quieter. Great for AM DXing. Bob, N1KPR ?? Youtube: N1KPR Youtube: Ham Radio Doctor Engineering, where enigma meets paradox On Sunday, November 6, 2022 at 04:47:58 AM EST, rinus nienhuis via <dridotcom3=[email protected]> wrote: searching for a passive? receiving shielded loop for medium wave broadcast band have somebody a design? thanks in advance rinus
W0LEV All Messages By This Member #16939 Shielded untuned loops are easy to build and far less expensive than buying one ready-made.? I have two which I built:? 1)? A 2-Meter diameter 2" copper pipe with three internal turns and 2) A 0.5-Meter diameter 0.5" copper tubing with five internal turns which I use for DFing.? The nulls are extremely sharp on the small loop!? The larger loop is mounted up on the hillside just to our east and is used pretty much for VLF/ELF receive. Again, really simple to build.? Just pay attention to symmetry. Dave - W?LEV? toggle quoted message Show quoted text On Mon, Nov 7, 2022 at 6:58 PM Bob, N1KPR via <rwbetts=[email protected]> wrote: Hi Fred; It's non-resonant so it acts like the secondary of an air-core transformer. I had a 48" version for LOWFER work (136 and 472 KHz), but really couldn't see enough signal gain to account for the bigger size. Also monitored Cutler (Maine)signals around 24KHz here in Connecticut (W-J8711). I'm currently using an old Rockwell-Collins RDF 650 Aircraft receiver for LOWFER 472. One of the projects is here: ?? Youtube: N1KPR Youtube: Ham Radio Doctor Engineering, where enigma meets paradox On Monday, November 7, 2022 at 11:01:51 AM EST, Fred Moore <n40cla@...> wrote: Good morning Bob, Do you possibly have the same design for 100khz - 500khz?? Basically I think the only difference would be the wire length and maybe the loop diameter.? Thanks Fred - N4CLA On Sun, Nov 6, 2022, 11:58 Bob, N1KPR via <rwbetts=[email protected]> wrote: I uploaded a triple shield passive loop that is a common monitor antenna for b'cast stations. I use it with a 15-20dB preamp for home entertainment. That gives a signal strength equal to my 160-meter dipole but much quieter. Great for AM DXing. Bob, N1KPR ?? Youtube: N1KPR Youtube: Ham Radio Doctor Engineering, where enigma meets paradox On Sunday, November 6, 2022 at 04:47:58 AM EST, rinus nienhuis via <dridotcom3=[email protected]> wrote: searching for a passive? receiving shielded loop for medium wave broadcast band have somebody a design? thanks in advance rinus -- Dave - W?LEV Just Let Darwin Work
W0LEV All Messages By This Member #16940 Oh, yes..... I also have a 1-Meter diameter of 0.5" copper tubing loop which is tuned and I occasionally use it for transmitting during the peak of lightning season.? The Q is extremely high.? 2:1 SWR bandwidth on 40-Meters is about 5 to 6 kHz!? I could potentially run a spark transmitter to that loop without ever violating energy outside the band!!?? Dave - W?LEV toggle quoted message Show quoted text On Mon, Nov 7, 2022 at 9:16 PM David Eckhardt <davearea51a@...> wrote: Shielded untuned loops are easy to build and far less expensive than buying one ready-made.? I have two which I built:? 1)? A 2-Meter diameter 2" copper pipe with three internal turns and 2) A 0.5-Meter diameter 0.5" copper tubing with five internal turns which I use for DFing.? The nulls are extremely sharp on the small loop!? The larger loop is mounted up on the hillside just to our east and is used pretty much for VLF/ELF receive. Again, really simple to build.? Just pay attention to symmetry. Dave - W?LEV? On Mon, Nov 7, 2022 at 6:58 PM Bob, N1KPR via <rwbetts=[email protected]> wrote: Hi Fred; It's non-resonant so it acts like the secondary of an air-core transformer. I had a 48" version for LOWFER work (136 and 472 KHz), but really couldn't see enough signal gain to account for the bigger size. Also monitored Cutler (Maine)signals around 24KHz here in Connecticut (W-J8711). I'm currently using an old Rockwell-Collins RDF 650 Aircraft receiver for LOWFER 472. One of the projects is here: ?? Youtube: N1KPR Youtube: Ham Radio Doctor Engineering, where enigma meets paradox On Monday, November 7, 2022 at 11:01:51 AM EST, Fred Moore <n40cla@...> wrote: Good morning Bob, Do you possibly have the same design for 100khz - 500khz?? Basically I think the only difference would be the wire length and maybe the loop diameter.? Thanks Fred - N4CLA On Sun, Nov 6, 2022, 11:58 Bob, N1KPR via <rwbetts=[email protected]> wrote: I uploaded a triple shield passive loop that is a common monitor antenna for b'cast stations. I use it with a 15-20dB preamp for home entertainment. That gives a signal strength equal to my 160-meter dipole but much quieter. Great for AM DXing. Bob, N1KPR ?? Youtube: N1KPR Youtube: Ham Radio Doctor Engineering, where enigma meets paradox On Sunday, November 6, 2022 at 04:47:58 AM EST, rinus nienhuis via <dridotcom3=[email protected]> wrote: searching for a passive? receiving shielded loop for medium wave broadcast band have somebody a design? thanks in advance rinus -- Dave - W?LEV Just Let Darwin Work -- Dave - W?LEV Just Let Darwin Work
vbifyz All Messages By This Member #16941 Take a look at my project here: /g/loopantennas/files/AF7KR%20projects/Two%20turn%20shielded%20loop It is 100% shielded and 100% balanced (which may make some difference in null depth, but I didn't notice any). I am more interested in HF, and this loop rolls off above 3MHz, so I didn't play with it much. 1m diameter works very well on AM BCB, may work fine on LW too. The cable is RG-6Q. The preamp is LZ1AQ clone. 73, Mike AF7KR

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