Re: LF: XGJ in TF

[Warren Ziegler <wd2xgj@gmail.com>]

Hi Stefan,

           Output power is the same as before, approx 1100 Watts with a modified Decca.

The difference is likely less than 3dB, one coax was RG-11, the other is RF-214/u silver plated dual shield. The RG-11 was up longer and finally broke, the RG-214/u was added latter.

The RG-214 has a noticeably lower resistance as one might expect.

When running two loops in parallel my ERP was measured at 4W (actually within a range of 3.5-4.4W)

I live in New England which is heavily wooded. I have experimented with verticals but the ground loss is high due rocky soil is very high.

If you have very lossy ground it is unlikely that you will see a benefit with a Litz wire loading coil as the ground losses >> than the coil loss.

I also started a small fire with the vertical due to the high voltages - and this was when running only 250W out.

I have settled on loops as best for my location, but even then I had to put in considerable effort to make sure that the tuner could handle the high currents without over heating.

-- 
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