dnw64
Veteran Member
I feel like I've either slipped into a very deep rabbit hole or Google Translate is not working.
:laughing:
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I feel like I've either slipped into a very deep rabbit hole or Google Translate is not working.
:laughing:
No Translation Button???? :laughing:
k0ua
Epic Contributor
The OCFD is about 132 foot. With a balun designs 4:1 at the feedpoint. Height is 35 feet.
k0ua
Epic Contributor
Well lets see if we can help out a bit:
A G6 is an old 144 to 146 Mhz (Megahertz) antenna made by the Hustler corp. 144 to 144 Mhz is the so called "2 meter amateur band". An isopole is another ancient antenna that used to be made by a company called AEA. Now out of business as far as I know. It used a sleeve decoupling technique instead of a more traditional ground plane.
The OCFD (Off Center Fed Dipole) is just another method of feeding a dipole wire antenna. Most dipoles are fed in the center of the antenna with equal lengths of wire on either side of the feedpoint (usually but not always coaxial cable). An OCFD is not fed in the center, and is usually fed at about the 1/3 point sometimes a bit less. The reason for doing this with the addition of a 4:1 Balun which is kind of a transformer to allow usage of the antenna on multiple bands of frequencies.
The HWEF is a (Half Wave End Fed) this is taking a dipole to extremes and actually feeding it from the end instead of anywhere along it length. This requires a 49 to 1 type of transformer to transform the extremely high impedance that result when you feed a traditional dipole from the end.
MARS frequencies: MARS refers to the Military Affiliate Radio System. This is governmental program that recruits Amateur radio operators into this quasi military radio service. The frequency's that are assigned to this service fall just outside the normal Amateur radio assignment. This requires modification of the radio equipment to hit these frequencies, and often requires modifications to Amateur antennas to work (and be resonant) on these extended frequencies. We can discuss impedance and resonance in a different memo if you desire.
The MA5B is a type of Yagi antenna designed for the 20, 17, 15, 12 and 10 meter amateur bands. This is a small footprint antenna made of aluminum and is small and lightweight with modest forward gain and fair front to back ratio and front to side ratios. The aperture of the main lobe is fairly broad with the 17 meter and 12 meter portions being just a rotary dipole the aperture is around 180 degrees of course with no front to back ratio, but still good front (and back) to side ratio. We can discuss these terms like front to back and front to side and 3dB beam-widths in a separate memo if you like. I know it all seems so confusing at first, but just like eating elephants (one bite at a time) you can understand all of this if you wish by taking it in small bites and moving on into deeper understanding.
A 2 meter 13B2 is another type of 2 meter amateur band antenna, in this case a 13 element beam with excellent front to back and front to side ratio's and very good forward gain with a small aperture main lobe. In the case of the aforementioned G6 Hustler and Isopole antennas they are omni-directional antennas while the 13B2 is beam type antenna which must be aimed, and this usually implies a rotor mechanism to aim beam type antennas.
I hope this helped illuminate at least in a small way some of the confusion over these acronyms and jargon we Amateur radio operators use when we communicate to each other. I do realize each explanation just brings up more questions, but such is the way of technical knowledge.
An other example of tightening a nut on a bolt, bring ups discussions of torque wrenches and penetrating lubricants as well as possible side discussions of castle nuts and safety wire. Nothing is easy and you must start somewhere and answer subsequent follow up questions as best as you can without adding even more confusion. Ask me questions and I will give you answers as nearly as I know them.
tractorshopper
Veteran Member
Yup, and I still write the date as 19 Dec 2018.
Wagtail
Super Star Member
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- St Helens, Tasmania, Australia
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- JD 4105 / JD Z355E (48" deck)
Fair dinkum cobber!
Wagtail
Super Star Member
- Joined
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- 12,908
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- St Helens, Tasmania, Australia
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- JD 4105 / JD Z355E (48" deck)
"Dinkum", another new one. Definition please?
dinkum
INFORMAL•AUSTRALIAN/NZ
adjective
1.
(of an article or person) genuine, honest, true.
"a real dinkum bloke"
adverb
1.
really, truly, honestly.
dnw64
Veteran Member
Yup, that doesn't really help. And I consider myself a pretty tech-savvy guy... Oh, and I have an uncle who would certainly know exactly what you/re talking about - KD3XR (IIRC...)..
I have a passing relationship with a very interesting company located just down the road from us. We milled some flooring for the owner, and one of our employees worked there for a bit....
Anyways, they make nuts (and maybe bolts?) that indicate, not torque, but clamping pressure. They make what I think is a very good case for the fact that the critical value in structural fastening is clamping pressure. Nut/bolt torque can vary wildly depending on manufacturing tolerance of threads as well as cleanliness of threads.
Applied Bolting Technology Products
quicksandfarmer
Elite Member
Very interesting. I checked out the website. It looks like their main product is washers that have small holes in them. The holes are filled with colored liquid. When the washer is compressed the liquid is squeezed out, giving a visual indicator. I could see that being a much better indicator of tightness than torque. Clever.
k0ua
Epic Contributor
Here on this website is a picture and description of an "isopole". It seems someone bought out AEA or at least this idea for an antenna.
:: ISOPOLE ::
k0ua
Epic Contributor
Interesting. I learned some things.
goeduck
Super Star Member
girlfriends gave me the name in high school.
Well, that's scary. Those things are ugggly.
Big Barn
Super Member
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- Aug 20, 2013
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- 7,047
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- Victoria, B C
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- More than 40 over the years. Ten at any one time. Mostly Ford and New Holland
Just some girlfriends. Not all.
Hahahaha. Rather obscene looking too!
goeduck
Super Star Member
Hey, I only dated the hot chicks :laughing:
California
Super Star Member
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- Jan 22, 2004
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- An hour north of San Francisco
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- Yanmar YM240 Yanmar YM186D
I used to post on BBS's and Yahoo Groups with my real name. Then in 2003 during the time I was researching tractors before I bought one, I had a bad experience.
I unexpectedly got buried by 10,000 emails, bounce messages from ISP's all over the world, saying 'recipient unknown here'. The bogus emails that landed on them had my real name as 'Reply To' and random names in the other fields - 'To', 'From', Sent By', whatever all those technical fields are. The content of the emails was Viagra spam, randomized so no two messages were identical. Obviously crafted to evade any spam filter.
Somebody had taken an old program designed to flood Usenet groups with crap and used it to spam their Viagra via email, using real names that I assume they harvested off Usenet posts.
I also got a couple dozen real emails in reply, from calm 'take me off your list' to several burst-a-blood-vessel shrieking outrage ones and a couple of 'did my wife tell you to send this' or 'who told you my secret problem?' The funniest one was from the lady in Office Of Tourism in a Bible Belt state who was outraged when her secretary or somebody gossiped to everyone about what it seemed she had requested.
Ok, it was obvious that the age of innocence on the internet was past. I decided I needed a screen name. One that couldn't be traced through other venues back to me - in the sense that Facebook etc, portrays all the information a stalker would need to go dox someone. So - why not hide in plain sight. A screen name that is unique here but impossible to trace to an individual. I had noticed in the early days here with less than 10k members subscribed and far fewer posting, that nearly everyone at that time was in the Eastern or Southern states. So ... California! Unique here, so my name could be remembered, and at the same time impossible to trace to me alone. I signed up as 'California' after buying my first tractor (Yanmar YM240). And found a community that I enjoy being a part of.
I unexpectedly got buried by 10,000 emails, bounce messages from ISP's all over the world, saying 'recipient unknown here'. The bogus emails that landed on them had my real name as 'Reply To' and random names in the other fields - 'To', 'From', Sent By', whatever all those technical fields are. The content of the emails was Viagra spam, randomized so no two messages were identical. Obviously crafted to evade any spam filter.
Somebody had taken an old program designed to flood Usenet groups with crap and used it to spam their Viagra via email, using real names that I assume they harvested off Usenet posts.
I also got a couple dozen real emails in reply, from calm 'take me off your list' to several burst-a-blood-vessel shrieking outrage ones and a couple of 'did my wife tell you to send this' or 'who told you my secret problem?' The funniest one was from the lady in Office Of Tourism in a Bible Belt state who was outraged when her secretary or somebody gossiped to everyone about what it seemed she had requested.
Ok, it was obvious that the age of innocence on the internet was past. I decided I needed a screen name. One that couldn't be traced through other venues back to me - in the sense that Facebook etc, portrays all the information a stalker would need to go dox someone. So - why not hide in plain sight. A screen name that is unique here but impossible to trace to an individual. I had noticed in the early days here with less than 10k members subscribed and far fewer posting, that nearly everyone at that time was in the Eastern or Southern states. So ... California! Unique here, so my name could be remembered, and at the same time impossible to trace to me alone. I signed up as 'California' after buying my first tractor (Yanmar YM240). And found a community that I enjoy being a part of.
