[QRZ.com via rec.radio.amateur.moderated Admin]

Antennas, Feedlines, Towers & Rotors

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I decided to go ahead and do it .....

Posted: 17 Jan 2018 01:54 AM PST
https://forums.qrz.com/index.php?thr...-do-it.595697/

My antenna plan, that is.

Just for kicks and grins ........ and personal edumacation.



I now have crossed 80m dipoles. Same support mast and about a foot apart.

I am also planning on raising the support at least another 10 feet.

Dipole 1(old one)- cut for around 3.9mhz. I do the math, cut the wire, use
a tuner. Fed with 650-ohm homebrew LL.

#2 - is basically a random piece of wire ( Hmmmm, That looks pretty long,
Ill use it!) ended up around 4.2mhz, fed with 50ft. of 450-ohm LL to a
4:1...



I decided to go ahead and do it .....

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Gremlins and strange radio faults that can drive a person crazy!

Posted: 17 Jan 2018 01:36 AM PST
https://forums.qrz.com/index.php?thr...-crazy.595673/

Gday all, I love Ham Radio and I love electronics as a hobby, but has
anyone ever had a weird and/or intermittent radio system fault that seems
impossible to solve? These kinds of faults always seem the weirdest and
hardest to solve!



My IC-718 has long had a strange 20 m no transmit fault that makes no real
sense except that using a 4:1 hybrid balun (with balanced line) is
generally successful. Using any other type of balun often causes the issue
to appear! I have no idea why? It...



Gremlins and strange radio faults that can drive a person crazy!

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Fence top rail as a mast?

Posted: 17 Jan 2018 12:00 AM PST
https://forums.qrz.com/index.php?thr...a-mast.595684/

Any thoughts on using a fence top rail as a mast? I saw these at the local
Home Depot yesterday and thought they might make good masts for dipole
antennas....maybe using two or three together to make a 30 foot mast. I
have some 4x4 posts on my fence that I could attached these top rails to
for bottom support.



Here’s the link to the product:
https://www.homedepot.com/p/YARDGAR....3DPT/100322532



Thanks



Colin

K7VIZ

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My final(?) attempt to improve Cobweb bandwidth

Posted: 16 Jan 2018 02:54 AM PST
https://forums.qrz.com/index.php?thr...dwidth.573588/

I described some modifications of the G3TXQ Cobweb in the other thread. I
called them Mark 1 and Mark 2. I built Cobweb Mk.1 myself and Elias, EB5KT,
built Cobweb Mk.2. Mark 2 was better because it had wider bandwidth on the
10 m band. However, bandwidth improvement came at a cost. The radiation
patterns of the modified Cobwebs were closer to a bidirectional dipole-like
pattern. Since that time, I modeled a number of other modified Cobwebs but
until recently all my ideas did work very well....



My final(?) attempt to improve Cobweb bandwidth