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Guineafowl's latest activity
G
Guineafowl
replied to the thread
Custom UHF Yagi antenna build
.
As you can see, I’m a bit stuck. I’m not getting an answer to this question: Not sure if it’s the wrong question, or if there’s a tacit...
Yesterday, 12:19 PM
G
Guineafowl
replied to the thread
Custom UHF Yagi antenna build
.
I take it I need a 75 - 50 ohm adapter, one end like this: And the other a male SMA. The antenna was put to use today - repairing a...
Yesterday, 11:43 AM
G
Guineafowl
replied to the thread
Custom UHF Yagi antenna build
.
Yes, it’s easy to enough to understand on a basic level, as the reading on the dial to minimise, but what I mean is, the initialism...
May 12, 2024
G
Guineafowl
replied to the thread
Custom UHF Yagi antenna build
.
To add to the above: I’m going to have to admit that the ARRL book is a bit beyond me. It’s a vast collection of knowledge, written by...
May 12, 2024
G
Guineafowl
replied to the thread
Making a Shortwave listening antenna
.
Thanks. Both of these antenna projects have been on the back burner, as life is getting in the way a bit. As far as I can see from the...
May 12, 2024
G
Guineafowl
replied to the thread
Custom UHF Yagi antenna build
.
The balun was designed by the software, based on that particular Yagi design and with RG6 specified as the cable. Maybe it’s a...
May 12, 2024
G
Guineafowl
replied to the thread
Help me understand cheap boost module?
.
As I understand it, a handheld taser has two ‘stabbing’ prongs for delivering the shock, branching off from which are two smaller prongs...
May 9, 2024
G
Guineafowl
reacted to
Tom.G's post
in the thread
Even Engineers Doodle -- on the ICs they design
with
Like
.
But you better have a microscope to see them...
Apr 18, 2024
G
Guineafowl
replied to the thread
Making a Shortwave listening antenna
.
6-18 MHz. I’ve found huge lists of SW transmissions, all at different time slots, and it’s quite difficult to work out what’s what with...
Apr 18, 2024
G
Guineafowl
replied to the thread
Making a Shortwave listening antenna
.
I’ve had a chance to build the loop as per post #25 by @Baluncore using twinax cable. Even in the daytime, it was receiving some pretty...
Apr 17, 2024
G
Guineafowl
replied to the thread
Custom UHF Yagi antenna build
.
Right, some progress, but some confusion. Standard copper pipe standoffs allow the elements to be raised into the plane of the dipole...
Apr 17, 2024
G
Guineafowl
replied to the thread
Submarine communications and RF skin depth
.
This seems to explain it - thanks. Another example of how the fascinating behaviour of water has enabled and shaped life.
Apr 16, 2024
G
Guineafowl
reacted to
renormalize's post
in the thread
Submarine communications and RF skin depth
with
Like
.
The EM absorption of water varies strongly with frequency. There is a passband at visible frequencies (which is no doubt why animals...
Apr 16, 2024
G
Guineafowl
replied to the thread
Submarine communications and RF skin depth
.
Apparently, fresh water RF comms are feasible, eg: http://eprints.gla.ac.uk/194214/7/194214.pdf Regarding seawater, an example formula...
Apr 14, 2024
G
Guineafowl
posted the thread
Submarine communications and RF skin depth
in
Electrical Engineering
.
In conductive media like seawater, EM waves experience attenuation related to their frequency. The skin depth formula calculates the...
Apr 14, 2024
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