Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>
Date: Mon, 3 Feb 2014 12:16:37 -0500
I hope everyone has had a chance to work FT5ZM on topband. With respect to circular polarization on our HF bands (3.5 - 28 MHz) and on 6m, theory says both the ordinary and extraordinary waves propag
Circular polarization cannot have an advantage on average, or over time. The problem with circular polarization on skywave is the wave has no set rotation, level, or phase. The circular antenna would
Hi Carl and top-band lovers I would like to mention Chapter 7.6 as well, polarization matching, and also 7.7 Fading. I started developing my HWF early 2009 and I think there is no more to squeeze fro
Author: Herbert Schonbohm <herbert.schoenbohm@gmail.com>
Date: Tue, 04 Feb 2014 14:23:01 -0400
Is there not a built in loss of 3db on both TX and RX with a CP antenna compared to an Axial mode antenna? Not that it makes that much difference on RX but 3db is 3db. Another issue with CP I underst
Author: Herbert Schonbohm <herbert.schoenbohm@gmail.com>
Date: Tue, 04 Feb 2014 15:00:36 -0400
Is there not a built in loss of 3db on both TX and RX with a CP antenna compared to an Axial mode antenna? Not that it makes that much difference on RX but 3db is 3db. Another issue with CP I underst
Is there not a built in loss of 3db on both TX and RX with a CP antenna compared to an Axial mode antenna? Not that it makes that much difference on RX but 3db is 3db. Another issue with CP I underst
Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>
Date: Wed, 5 Feb 2014 08:13:04 -0500
All, Bah, humbug. We got another 5 inches of snow overnight. We're running out of room to put the snow. At least I can stay inside and play on the radio. Tom makes some good points. Two comments. Fir
loss of signal results. I would also presume that the construction of a good CP antenna for 160 would be very difficult to perfect. I have seen some antennas for AMSAT work attempting to produce a CP
I am pretty new to 160 meters, but just got done with a diversity experiment with FT5ZM last night. My results go along with W8JIs comments. I heard them on 1.8265 at 2215 UT, and then tried to confi
Hi Carl, This has to be the big picture of the system and the goals, and not a narrow picture of what a wave is doing. I think in the big picture we all agree it is useless. First, when I said "advan
Do a second test when you mix the antennas or audio directly, listening to the combination in mono, and you will see it decreases readability no matter what phase you settle on. I am pretty new to 16
In producing a good satellite AMSAT antenna KLM uses the method of quarter wave stagger of two yagis. One is about a quarter wave ahead of the other and fed with a 1/4 wave delay line. Polar plots of
In producing a good satellite AMSAT antenna KLM uses the method of quarter wave stagger of two yagis. One is about a quarter wave ahead of the other and fed with a 1/4 wave delay line. To be circular
Tom The way I see it is if the rate is not 0.546 uS or so, you do not have circular polarization.You have a slowly rotating wave, and the sense of the RX antenna would be meaningless unless you could
The way I see it is if the rate is not 0.546 uS or so, you do not have circular polarization.You have a slowly rotating wave, and the sense of the RX antenna would be meaningless unless you could tim
Tom, Perhaps it is much simpler than that. Recalling KL7AJ's article, http://www.nxtbook.com/nxtbooks/arrl/qst_201203/index.php#/42 he states that the magnetic field of the earth splits every HF sign
James You brought a good article about HF propagation, however the behavor on 160m is different from HF. If you check on the KL7A arcticle figure 1 what is happening between 1 and 2 MHz you can see t
Jose, I am only presenting the possibility that if the ionosphere (where 160 propagation happens) isn't uniformly smooth and instead consists of "warps, wrinkles and tilts" that in a *dynamic ionosph
hi Guys, interesting discussion If want, hear this file, https://drive.google.com/file/d/0B8I6Nck0GwTdYTI0MzVkY2QtYjUyYS00YmE3LTk4NTktNWVlNzE2ZGFiYmE1/edit?usp=sharing this is E74AW and OZ1LXJ record
Here are some pictures and a sound file or two... http://www.w8ji.com/HF%20circular%20polarization.htm hi Guys, interesting discussion If want, hear this file, https://drive.google.com/file/d/0B8I6Nc