[600MRG] Active antenna suggestions

[Laurence KL7 L]

Ive a very similar set up with a L400b - mines at 25ft but nested a tree so dumping a bit of signal - but overall its pretty good from 11kHz up to 1.4MHz or so and competes well with a nested k9ay or loop- I did spend a heck of a time getting the height, location, bonding and common mode chokes "just right" as Goldilocks would say...

Laurence KL7L



> On Jun 18, 2015, at 17:12, Brian Pease <bpease2 at myfairpoint.net> wrote:
> 
> I have an active E field antenna from lfengineering.com, their L400B, which is for 10-500kHz.  It has a low pass filter between the antenna and the FET.  I have it mounted about 25 ft high, which turns out to be excessive.  I have 4 copper pipe ground stakes at the bottom of the fiberglass pole to ground the shield of the feedline and define the antenna as being out in the field.  I added a common mode toroid to the RG6 feedline between the ground stakes and the house for further noise isolation.  This setup is solidly atmospheric noise limited, even on my insensitive Rycom selective Level Meter.
> I would consider mounting it just 10 ft off the ground unless you need more gain.  Many don't understand that the length of an E probe antenna is really measured from ground level to the top of the probe, 25 ft on my case.  The shield of the coax feed (down to where it is grounded) makes up most of the antenna.  The Hi-Z amp in the probe merely allows it to be inserted near the top of the vertical antenna.
> 
>> On 6/17/2015 6:38 PM, ejkkjh at gmail.com wrote:
>> I am trying to set up a WSPR receive only and looking for suggestions on active receive antennas.  I would like to run WSPR receive for 600 meters using an active antenna.  It can be either outside or inside, but something not too big or high to be reasonably safe from lightning, I have had several strikes.  I would prefer not to build one, very busy with work, etc.  Receiver is a Softrock Ensemble II LF.
>> Any suggestions would be appreciated.  Thank you.  73
>> Emory  WM3M
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