Topband: Receive loop observations

[Jim Brown]

If you're on the air and have neighbors, you've got RX noise, and most 
of it comes from noisy electronics. SO -- you need ferrite cores to 
suppress that noise. You also need ferrite cores to kill common mode 
current on antennas. If you can buy cores that do both, you can buy in 
quantity.

N6RK noted that a #43 core could be used, with somewhat reduced 
efficiency. Efficiency usually doesn't matter for RX applications. #43 
cores are excellent for winding chokes to kill RFI above 4 MHz; #31 
cores are better below 4 MHz, and work well above 4 MHz. Also -- most 
ferrite cores sold at ham flea markets are either Fair-Rite #43 or are 
similar cores from another mfr.

Most of us have ham neighbors with whom we can combine a group purchase, 
and are members of one or more clubs with whom we can combine even more. 
Thus, buying in quantity is much easier than you think.

73, Jim K9YC

On Sun,4/3/2016 6:06 AM, James Rodenkirch wrote:
> I couldn't resist..................K9YC says...."The BEST way to buy ferrite parts is...buy in quantity from industrial distributors...."
>
> Well, first off, I don't need quantity - I need one or two ferrite cores.....so, I guess I'm "out of luck," eh?????