Re: LF: DEGEN 1103...Simple RX Loop info

[Mike-WE0H <we0h@yahoo.com>]

Hi Mal,

Use a LM741 Op-Amp in place of the OP27. That IC works perfect with a little less gain. You might already have one in stock too. There is a board layout and other info for building this loop here:
http://www.we0h.us/505kc/Simple-RX-Loop-Antenna/
That would save you time on a board layout if you wanted to etch a preamp board. The .pcb file is a ExpressPCB file of the board if you run ExpressPCB software.
http://www.we0h.us/505kc/Simple-RX-Loop-Antenna/Simple-RX-Loop-board-layout.jpg
is the board in a jpg file which you can print directly. Might take some scaling but you know the IC pin spacing to scale the board to. Easy. I use the iron on laser printed image then muriatic acid & peroxide etching mix to do the job. Quick & simple. A neat thing about this RX loop and others is you can sit the portable receiver next to the loop with no physical connection to the radio's loopstick antenna and get all the benefit of the RX loop with no feedline!!! I have done it many times. I built 2 of these loops as they work that well.
http://www.we0h.us/505kc/RX-Loop/Portable-RX-Loop-small.jpg
This is my portable version sitting in my backyard (garden) with variable tuning covering 200-650kc.

Mike
WE0H


Mal wrote:

Hello Mike

That is a nice loop and preamp. Where can I get an  OP-27 chip from.

de mal/g3kev