[Lowfer] Speaking of Loops for 1750 meters ;

[Warren]

Hi Andy,

     I've played with verticals and loops here for transmitting on the low 
frequencies and the loop is definitely more forgiving in terms of tuning.
However, I do find that I need to slightly adjust the capacitance to 
resonate the loop between summer and winter, I'm not sure if this is due to 
the temperature coefficient of the capacitors or changing ground (& 
environmental)  resistance.
   If the loop is in contact with foliage, it will have an effect on 
impedance, I found that it seems to increase the loop's effective 
resistance. For this reason when I move a loop or had trees cut down, I need 
more turns on the 50 ohm (primary) side of the transformer.

If I wanted to run unattended operation for a prolonged period of time 
without worrying about retuning, I'd definitely go for the loop.

73 Warren

----- Original Message ----- 
From: "Andy - KU4XR via Lowfer" <lowfer at mailman.qth.net>
To: "1750 Meter lowfer list" <lowfer at mailman.qth.net>
Sent: Tuesday, November 11, 2014 5:30 PM
Subject: [Lowfer] Speaking of Loops for 1750 meters ;


>I have several time desired to put " XR " back on the air, but the antenna 
>is always the
> holdup.. As many of you know; I used a couple of vertical designs in the 
> past with good
> success.. However !! Things have changed considerably at my QTH over the 
> past couple
> of years, mainly; a 16 month old Granddaughter that is absolutely 
> fascinated with all of
> Papaw's wires on the wall, and gidgy gadgets all over the place.. Forgive 
> me, but I have
> to be a papaw for a minute.. The other day, Zoey was sitting in my lap at 
> the radio desk
> listening to the static with me, and I rolled the VFO a bit, and heard a 
> heterodyne, so I
> swished the VFO back, and forth a few times to make the sound go up and 
> down, and
> Zoey got so excited that she started trying to reach the VFO knob.. I 
> don't normally
> let her touch my gear, but I couldn't help letting her swish the VFO.. She 
> grabbed the
> knob and began doing what I did, and made the sound go up, and down, and 
> looked up
> at me grinning from ear to ear with all 4 teeth showing, and started 
> giggling at me..
> ( A memory I'll cherish forever ) ... OK, thanks for the Papaw moment, now 
> back to the
> loop question I have.. I will have to locate the " XR " beacon in a place 
> where Zoey can't
> get to it of course, so the old Variometer is out of the question.. " IF " 
> my understanding
> is on track; once you get a loop tuned for TX, it fairly well stays 
> resonant even with changes
> in the WX, Seasons, and nearby Foliage, is this thought correct ?? The 
> vertical is completely
> the opposite of that, needing constant " touching up " to keep it 
> resonant.. If a loop for TX is
> very close to a " set it, and forget it " antenna, then that is probably 
> the way I need to go..
>
> Thoughts please ... They will be much appreciated.. 73 to all for now :
>
> Andy - XR
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