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Reviews Categories | Ham radio kits | Ramsey Electronics SM100 Signal Magnet Receive Antenna Help


Reviews Summary for Ramsey Electronics SM100 Signal Magnet Receive Antenna
Ramsey Electronics SM100 Signal Magnet Receive Antenna Reviews: 3 Average rating: 5.0/5 MSRP: $$90.00
Description: This antenna responds only to the magnetic field of the desired station and ignores the electrostatic field where most interference is found. It does a remarkable job pulling in stations lost down in the noise of power-line crud, fluorescent lamp buzz and light dimmer hash. Plus it's very directional, able to null strong stations on the same or nearby frequencies! Designed to cover the AM broadcast band, but includes details on building for any frequency range up to 15 MHz; it works gang-busters on Shortwave. Works indoors or out, contained in rugged PVC pipe with a single RG-59 coax cable connector. Operates with up to 500 feet of coax cable (you supply) between antenna assembly and control box (size: 5" x 5 1/4" x 11/2"). Includes all parts, matching case set and pre-cut PVC materials. Operates on external 120 VAC power adapter that is included. Antenna is 9 1/2" x 9" long, L-Shaped 1" PVC pipe with end caps.
Product is in production.
More info: http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=SM100
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You can write your own review of the Ramsey Electronics SM100 Signal Magnet Receive Antenna.

N6GND Rating: 5/5 Mar 1, 2013 15:13 Send this review to a friend
Works damn well  Time owned: 0 to 3 months
I use this as an alternative RX antenna on 80 and 40 meters where powerline and other noise in my urban environment produces a noise floor of about S6. I stuck the antenna on a tree branch about 7 ft. above ground, well below my transmitting antennas which sit on my roof or 15 ft. above the roof. Noise is down to about S1 and CW signals which were difficult to copy in the noise become clear and easy to hear. I wound the ferrite with 13 turns of wire and the frequency range appears to be about 3.4 mHz up to about 11 mHz which is just what I need.
 
K0RWM Rating: 5/5 Feb 6, 2013 20:01 Send this review to a friend
I love it, it works!  Time owned: more than 12 months
I built one of these about 5 years ago and it works great. I was going to build an external loop using a varactor diode tuned shield loop through the feedline. That is what the SM-100 is and for about what I would have spent buying the parts, instead I have a neat looking and well working unit. It has a FET amp which keeps the loop Q high. I am going to change from 70 turns on the large diameter 7.5 inch ferrite loop which tunes 490 kHz to 1.67 mHz to cover 160 and 75 meters. For example 32 Turns tunes 1.2 mhz to 4.11 mHz. The null if very sharp. I can see setting it out in the yard and nulling out the neighbors plasma TV. 20 Turns tunes 1.9 mHz to 6.5 and 10 turns tunes 3.8 to 13 mHz. Get the shielded loop outside, away from household electrical noises and tune the to the exact frequency from turning a pot I do not understand why more people are not talking about and using this antenna. I just helped an experience SWL friend assemble one the last several nights. He is blown away. It is not a toy.



 
W0FEN Rating: 5/5 Dec 12, 2011 07:59 Send this review to a friend
Great Faraday Antenna  Time owned: more than 12 months
I put this kit together over year ago. I use it to receive an AM Broadcast Station. It is in a noisy computer environment and does exactly what it is designed to do. Since it can be wired for up to 20M it will let you work when there is lots of electrical noise. Take time when assembling. This will produce a good result. Remember a Faraday shield cannot be a shorted turn. There must be a gap. For the price it can't be beat. I have not used it for Ham/SW reception and so cannot rate it for that.
 


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