[Lowfer] SIW, EAR, MLS

[Michael Sapp]

Hi All:

An afternoon capture of SIW on my NW EWE antenna fairly steady signal about 
10dB out of the average background noise...

https://www.dropbox.com/s/801k9eh6r2p5ld8/SIWF417.JPG?dl=0

Then I went hunting for EAR.

https://www.dropbox.com/s/oz6wvu0mgx31xyl/EARF417.JPG?dl=0

An experiment with EAR was to begin on the NW EWE antenna, then switch to 
the NE EWE antenna
where the carrier line above EAR dissappears on the waterfall is the switch 
to the NE and about 20dB out of the noise.  A few dB or more stronger on the 
NW EWE antenna as EAR is jsut starting to dog-bone in the NW direction which 
is just about middle of my NW EWE antenna pattern.  QRZ seays EAR is 339.5 
deg and 235.9 miles.


A similar trial with MLS, in this capture the antenna is pointed NE and 
average background noise -65 range.

https://www.dropbox.com/s/cjg1zr51cxitm4d/MLSF4A7.JPG?dl=0

In this capture the antenna is back to the NW and the background noise is in 
the -72 range...

https://www.dropbox.com/s/8q5cvbswyedbgvg/MLSNWF4.JPG?dl=0


On the NW/SE EWE antenna the 10.5:1 binocular tranformers (on both ends) are 
made with four BN73-202 cores glued end to end.

On the NE/SW antenna, the 10.5:1 transformers are made from two sets of 
four FT87-75 tordial cores glued together to create a larger binocular core 
with two or more times the permeability of the 4xBN73-202 transformer cores.

It was quiet enough this afternoon to do this test and not have much QRN 
from any direction.  I'm concluding that the larger binocular cores made 
form type 75 material have a higher level output signal from the antenna 
transformers versus the smaller 4xBN73-202 core antenna transformers---the 
difference being the permeability of the core mater.  Also having decoded 
G8HUH last night on 630m wspr2 at the same time as N1BUG leads me to believe 
there is simply more output level on the NE EWE antenna from these higher 
permeability transformers, versus the NE direction being substantially more 
noisy than the NW direction.

I suppose the next experiment is to switch the transformers on the A and B 
antennas and see if some reciprocity exists.  Both transformers are very 
effiicent with losses in .15 db range (individually) in back-to-back tests 
with an HP3586c SLM at 475 kHz...

73, Mike wa3tts