[Lowfer] Tree-Tenna lowFER Attempt

[Michael Sapp]

Andy: You may have better results coupling an e-probe antenna to the tree 
several feet or higher up and ground the coax shield to the tree roots at 
base with a CM choke following to shack. Then toy with the coax separation 
distance from trunk (on trunk, 1 inch away, 2 inch away, etc.  Also toy with 
the probe size and separation.  The tree should load down the e-probe's 
active device from it's very high Z input, so toying with the bias resistor 
would make sense.  I think Ralph's active tree antenna had a 2 megaohm 
resistor if I recall correctly.....

Anyway I always have reasonably results (local NDBs come up in strength 
considerably) close-coupling the whip from my Sony 2001 at LF to a tree and 
using it's built-in antenna trimmer to tune the fet front end, but I have 
not tried the tree root ground thing with it yet......not the best weather 
for such antics.....but I should try that some day....

If you have any LF portable radio with a whip (that works at LF, many don't) 
it may be worth a try.  The manual antenna trim feature on the old Sony 2001 
is especially useful for such experiments.....(and that antenna trim circuit 
is pretty neat if you look at the schematic for the Sony 2001 )... I think 
the bias resistor on the front-end fet in the Sony 2001 is 1 megaohm ---  
makes sense given how the radio would be in use near other objects .....

Mike wa3tts



----- Original Message ----- 
From: "Andy - KU4XR" <ku4xr at yahoo.com>
To: "1750 Meter List" <lowfer at mailman.qth.net>; "Part 15 Group" 
<part15 at yahoogroups.com>
Sent: Tuesday, February 04, 2014 10:25 AM
Subject: [Lowfer] Tree-Tenna lowFER Attempt


> Good day all:
>
> Just a quick note.. I tried the Tree-Tenna on 1750 meters last night and 
> was dismally
> disappointed.. Not a single lowFER received.. I tried for Ear, WI , MLS , 
> SIW - slant ,
> and TAG , I parked on 188.830 for the overnight thinking that EAR would 
> probably
> pop up in the early morning hours.. Overnight captures proved otherwise ..
> Tuning at 1750 meters is extremely sharp, and difficult to accomplish.. BW 
> is next
> to nothing without having to retune.. In its current configuration; it 
> would not be a
> desired to use antenna on 1750.. Armed with that knowledge; trying to go 
> on down to
> 2200 meters would be even more difficult.. The only advantage would be 
> stronger
> signals there..  More later:
>
> 73: Andy - KU4XR
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