[Lowfer] Speaking of Loops for 1750 meters ;

[Laurence KL7 L]

I agree with Warren - the loop was the only tx antennae I felt comfortable with unattended for a month running 1Kw - mind u I wasnt paying for the renters insurance at the time :-). 

ive found the variability in tuning had been very location dependent - a lot more in Alaska than Okie

Were having an evening off work and enjoying a beer in Playa del Carmen but ill try to do a rx session on the beach later on wspr2 475

Can someone please turn off the sun for a week or so?

Laurence KL7L/xE3

> On Nov 11, 2014, at 16:59, "Warren" <k2ors at verizon.net> wrote:
> 
> 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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