axorlov
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Posts posted by axorlov
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8 hours ago, Sshannon said:
The vast majority of patents are based on new applications of existing knowledge.
If only Dr Fong would patent the use of the 5 to 7 ferrite beads as a common mode current choke. This is what this specific antenna is seriously lacking. And this is why it is not suitable for the installation on the metal mast. Free idea for a patent: ferrite beads as a choke for the colinear 2- or 3-band J-pole made out of twin-lead inside PVC pipe. I'm sure USPTO will be glad to issue this patent.
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Yes, to be be fair, the patent is about decoupling of two frequencies with traps. My original cry about patenting J-pole is wrong. Still crazy. This method of decoupling is known for longer than I live on this miserable planet.
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WOW!! Dr. Fong did patent a
J-pole!using a trap to electrically shorten the antenna!8947313
J-pole with stubs, to be precise. Crazy! I guess anything is possible after some dude patented windshield rain wipers.
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It is very simple: don't like nets, don't participate. For example, I do not like nets with check-ins, so I do not go there and do not check in.
- gortex2, generalpain, SteveShannon and 1 other
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33 minutes ago, WRQX963 said:
In Band Adjacent Channels
Oh, In Band On Channel... I'll be damned! iBiquity tech. Thanks for the hint.
Super funny. I, somehow, never managed to stumble upon this acronym (maybe I don't remember), and when I googled "IBOC radio" I only got Jesus-casters. And I thought: "oh cool, new conspiracy theory!", which is an old conspiracy theory, of course.
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2 hours ago, MichaelLAX said:
With all due respect, Joel, your statement is only one word away from a classic anti-semitic Trope.
No, no, no, this has nothing to do with Jews. That is straight up Marxism, both feet in, but only ankle-deep for now. The theory of class struggle.
IBOC - Inspiring Body Of Christ? Sure, opium for the masses (another Marxian reference for ya all, I can do it all day, LOL). However, where I live, it does not seem to be the case. FM stations are mostly under the Clear Channel umbrella, with a few independent and one-two NPR affiliates.
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1 hour ago, MichaelLAX said:
Yes, the FCC made a big mistake when they approved HD-FM for use in the US.
I think DAB+ is a better system, but I can see the logic behind approving the system that shares analog FM frequency with the old system. A way more people in US depend on FM radios in cars than in Europe. Transition similar to NTSC->ATSC TV transition would make many people angry, because they would lose their favorite stations overnight. iBiquity designed the system in the constrains of US market, i.e. 400KHz channel bandwidth, which is not a thing in the rest of the world. The biggest problem is the intellectual property and patents being held by iBiquity->DTS->Xperi. But by now patents should be expired already.
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What a terrible world we live in. Some will talk about jarring farts, others will complain about some talking about jarring farts. After listening for 30 minutes. Where an honest man to go?
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2 hours ago, Blaise said:
OK, I tried not to do it, but it's every day in groups of Facebook *and* reddit now:
- "GMRS is not a hobby"
- "GMRS is only for talking to your family and friends"
- "There are no GMRS groups to join. You should just take the test and be a ham."
Why anybody would need a justification from others to do what he/she wants to do? If GMRS is a hobby to you, great! It is not to me, but why would you care how I use the service? You only care about how YOU use it. Do whatever you want, while being a good neighbor to other users. It's a free country.
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Glad to help, :thumbup
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2 hours ago, WRTB501 said:
do you happen to have the name of it
This is what I have: https://www.amazon.com/gp/product/B08CBPDZQY/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
There are plenty of similar designs on amazon, starting with $8. My stem is really short, shortest possible, I think 30mm, so the steerer tube really keeps the pouch upright. On a longer road stem the pouch will not stay upright, but I think some solution could be found. Something like this adapter can be used to keep the pouch upright, or maybe to bolt the pouch to it: https://www.amazon.com/Kbrotech-Bicycle-Adapter-Adjustable-Handlebar/dp/B07KC656V1/ref=pd_bxgy_sccl_2/134-8065183-2643462?pd_rd_w=yH74M&content-id=amzn1.sym.7757a8b5-874e-4a67-9d85-54ed32f01737&pf_rd_p=7757a8b5-874e-4a67-9d85-54ed32f01737&pf_rd_r=FNT3ZSBY5FGX2RGDQS17&pd_rd_wg=F5Ck9&pd_rd_r=63e83620-289b-4d1d-8db1-5956b2c71e45&pd_rd_i=B07KC656V1&psc=1
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On bicycle (MTB) I use a radio pouch strapped to the handlebars. Works well, pouch has two straps, one goes on one side of the stem, another on the other side. The short stem keeps the pouch with radio upright. I can hear if somebody is calling me and stop to chat. Except when I'm going downhill at 35mph, but then I do not want to chat, anyway.
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Also known as Kenwood T-connector. Solution with cigarette lighter adapter would work, but if you want to improve on it and go with more reliable connection with better current capacity, you can search amazon for "kenwood t connector". There are plenty of different variations, already on the cable or separate. You do not need a soldering iron to make a cable, you would need a crimping tool of average quality, easily found in car parts stores on in Home Depot.
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2 minutes ago, wayoverthere said:
Was he actually stomping on their communications, though? I haven't read every account of it, but what I've read (including a skim of the proposal) just mentions him transmitting on their frequencies.
He had no clue in his hangar. He may very well be stomping on comms between command center and remote crew, who he can't hear. One can deduce a lot by listening to open air, but he still did not have a band plan (since he was not a responder) with assigned times, frequencies and reserve frequencies. And just simple distraction counts too. If you are dispatcher talking to Crew A, B and C, you already have your mind busy for the responding to some random dude, no matter how well intentioned. There is a phone line for that, with different dispatcher.
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And I was incorrect with my last statement about parity of $24K then and $35K now. According to BigMac Index, $35K today is much less than $24K back then.
Data is from inflationchart.com
- back4more70 and tep182
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2 minutes ago, wayoverthere said:
but it boggles me a bit that the intentional and repeated interference of Bondy was less of a fine than the well intentioned (warning of hazards) but unauthorized transmissions
Nah... I think it's appropriate difference. One is merely messing with the Shopping Mall, another is stomping on communications during a real fire. Also, consider that $24K in 2009 and $35K today are probably not that far apart.
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I do not have real experience with 1/4. I do with 5/8 (BR-178-S) and 5/8 over 1/2 (BR-170-S). The longer the better, obviously. The difference is clear. The experiment we did was to put operator 1 with TK-3170 on the porch in the 1-2 story suburbia, and operator 2 is driving around on Dodge Durango with 5/8 on the roof. When the signal in either direction becomes borderline acceptable, stop and change to 5/8 over 1/2. The improvement is clearly noticeable on both ends. However, improvement is outweighed by the 31" of the BR-170. The BR-178 is only 11". The roof of Durango is exactly 6' from the ground, with another 11" I sometimes wack the ceilings in really low garages. I consider hit a hi-five from the parking structure. Also, the "-S" version helps, it is with the spring, more flexible than just a rigid whip. And 9" is a plenty for a ground plane.
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2 hours ago, marcspaz said:
I actually have an antenna analyzer that emulates having the antenna on an HT
I would guess, that analyzer measures SWR at the feed point of the antenna. Of an actual antenna, not of the "rubber duck" part of it. Actual antenna would consist of the "rubber duck" + body of the analyzer + counterpoise.
And when I say about capacitive component, I do not mean that operator's body is capacitively coupled. It could be very well galvanically coupled with the body of HT. I'm talking about the capacitive part of antenna impedance -j*G, where "G" stands for "ginormous". That's in free space. When operator takes HT in his/her hand it becomes -j*G*1000.
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Found it, the link: https://www.hamradio.me/antennas/ht-antenna-comparisons.html
And the thread where Lscott brings it up, and our resident infulenzer is also quoted:
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35 minutes ago, marcspaz said:
Are you implying that there is no way to measure the SWR of an antenna that screws to the top of the handheld radio? Or are you implying there is no way to to measure the SWR while the antenna is on the handheld? Or are you implying some other type of measurement can't be done?
All of the above. You would need to modify the HT to put an SWR bridge before feedpoint to measure SWR accurately. And even this measurement will not have much meaning because when you hold HT in the hand and when it is on the belt, or on bicycle handlebars, will produce different measurements. I do not imply any hidden message here, I say that one cannot measure SWR of the HT antenna by plugging SWR meter between the HT body and the thing misleadingly called "HT antenna". The HT antenna is: 1) that thing; 2) body of the HT; 3) body of the operator. All three together.
There was a link on this forum about measuring the field strength of the same HT with different "antennas". This is how you can measure efficiency of the HT+antenna. Let me see if I can find it.
Jeeps & Radios
in General Discussion
Posted
Nice! Motorola and Torque on a big screen.