Re: LF: XGJ in TF

[Warren Ziegler <wd2xgj@gmail.com>]

Stefan,

    I just re-read your post, I gather you are asking about Litz wire as a loop conductor?
My friend Bill Ashlock tried using ex-Decca Litz wire as a loop and found that it was too fragile, individual strands broke and the wire became more lossy than conventional wire.

I am considering using large diameter aluminum wire, the conductivity is of course not quite as good as copper but the skin depth is greater so that the net result is that Al is 33% more lossy than copper at LF frequencies but Al is only about 25% of the weight as Cu (also Al is about 25% of the cost of copper) so for the same weight of wire Al should be superior.

-- 

73 Warren K2ORS

                WD2XGJ 

                WD2XSH/23

                WE2XEB/2

                WE2XGR/1

 

2011/12/4 Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>

Warren,

Ah, two in parallel, i thought in series. Tnx info.
So now you have 3 dB less radiated power due to twice the losses? Or did you compensate that by 3 dB QRO ;-)

Is the loop sourrounded by trees or why didi you decide to prefer a loop as the TX antenna? Which cable did you use and have you ever tried RF litz wire, e.g. the Decca type which i use now for my coil?
Sounds all interesting and a nice proof that it is a working alternative.

Did you series compensate / resonate the loop and is it errected by a large ferrite xfmr with one or two secondary turns?

73, Stefan

Am 05.12.2011 01:23, schrieb Warren Ziegler:

Hi Stefan,

   Thank you!

My loop used to be two parallel turns of coax, one of the coax cables opened up recently so now it is a single turn loop approx 24m vertical by 44 meters horizontal.

-- 
73 Warren K2ORS
                WD2XGJ 
                WD2XSH/23
                WE2XEB/2
                WE2XGR/1

 

2011/12/4 Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>

Hi Warren,

Even 4X, that's very remarkable! You are the one with the 2 turn TX loop, right?

Good luck and i hope i will see something too.

73, Stefan/DK7FC

Am 05.12.2011 01:12, schrieb Warren Ziegler:

Hi Stefan,

   Thank you!

Roman RW3ADB reported XGJ last night  on the TF3HZ, 4X1RF, and F1AFJ grabbers at the same time,

-- 
73 Warren K2ORS
                WD2XGJ 
                WD2XSH/23
                WE2XEB/2
                WE2XGR/1

 

2011/12/4 Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>

LF,

I can see very clear traces of XGJ tonite at TF3HZ, http://simnet.is/halldorgudmunds/TF3HZ_LFgrabber/
Is it the first time? At least i found no capture on the capture archive...

73, GL, Stefan/DK7FC

--
73 Warren K2ORS
                WD2XGJ
                WD2XSH/23
                WE2XEB/2
                WE2XGR/1

 

--
73 Warren K2ORS
                WD2XGJ
                WD2XSH/23
                WE2XEB/2
                WE2XGR/1