Should be able to make a neater square though with 15 mm tube and elbows. Have used the softer micro bore stuff and its hard to get perfectly straight lengths ... and SWBO has to approve it
.
But thanks, keep the ideas coming Gary
Hi
Been a long time since I looked at the thread. I've since rebuild the loop after shoving up 50 watts of RF up the coax!
This time it was rebuilt with 2N3866 transistors which I highly recommend, I also built it on double sided copper laminate board Manhattan style, I also used 43 mix ferrite ring with 21 swg Bifilar wire. This then gave useful gain to over 100mhz, lower noise and higher output with less intermodulation from high power stations. The additional back to back diodes in parallel with the loop cuts down RF when I'm transmitting and subsequent high ac voltages on the transistor B-E junctions.
These days I'm experimenting with transmitting small loops with great success. I do it a different way to common practice and this has improved the efficiency of the loop massively, I may apply for a patent but not sure as yet.
Applying for a patent is all very well but unless you're able to defend against an infringer there's very little point. If a big company decided to use your intellectual property they would be able to outgun you with lawyers.
Patents are only any use to large corporations. Also they can patent stuff that's really doable by anyone versed in the art. The USPTO gets more money from approving patents than rejecting them and really do little prior-art research, or anything. The system is that it's up to a competitor to test the "patent" in court.
What Jeffrey writes is true. It's about who has the deep pockets. Apple, Qualcomm and IBM may spend more on "patents" and patent lawyers in their R&D budget than on engineers actually developing stuff. A start-up may expend a lot on patent preparation and applications just to look good to investors. See Theranos.
Patents haven't really been about protecting a small inventor's idea since early Victorian era. Edison famously weaponised them, which resulted in Hollywood and eventually his motion picture patents were invalidated by the Governement for economic reasons, rather than the fact that he didn't invent motion pictures at all. The USPTO was not reformed and is now far worse.
Copyrights are easier to protect and in some fields associations will come to your defence even if the predator is Disney.
But even with copyright and trademarks and Registered Designs (USA = Design Patents), the system is on the site of the corporation.
Coca-Cola, Apple (though they lost to Fujitsu, Cisco, Beatles and Swiss Rail, but those have money), Amazon, Vogue, Time Warner/Warner Discovery, Lindt. Disney, Oracle etc.
Aye it was just a passing thought.
What annoys me is others saying it's their idea when it's blatantly not!
Who invented what is often complicated. If you dig around, you'll often find prior art. The US patent office barely bothers to look. The UK and EU patent offices are a little better but not much.
As Mike says, patents are mainly used as weapons by large companies.
(20-06-2023, 09:16 PM)Murphyv310 Wrote: [ -> ]Aye it was just a passing thought.
What annoys me is others saying it's their idea when it's blatantly not!
It annoys me too. With the internet, in particular, many people are hoovering up anything worthwhile and claiming rights to them.
In practice though there is very little which is new. With any idea someone somewhere is likely to have thought along the same lines. It's a big part of the function of research to investigate that. It's perhaps also part of the reason why research papers are so formalised, and patents exist.
Tracy
(21-06-2023, 06:02 AM)BusyBee Wrote: [ -> ] (20-06-2023, 09:16 PM)Murphyv310 Wrote: [ -> ]Aye it was just a passing thought.
What annoys me is others saying it's their idea when it's blatantly not!
It annoys me too. With the internet, in particular, many people are hoovering up anything worthwhile and claiming rights to them.
In practice though there is very little which is new. With any idea someone somewhere is likely to have thought along the same lines. It's a big part of the function of research to investigate that. It's perhaps also part of the reason why research papers are so formalised, and patents exist.
Tracy
Hi Tracy.
I certainly agree. I have no issues whatsoever in anyone copying anything I make, I have done countless hours of research on small transmitting loops and felt the preferred way of coupling to the main tunable loop was very lossy and surely there was a better method. My idea of coupling was again researched and no where do I see this simple method anywhere. Perhaps others have done it but again who, where & when?
Field tests have proved it works. 500 milliwatts to the Shetland isles on 20 meters with a signal level received of 10 over S9.
Vancouver with S9 again on 20 meters using 5 watts, all QSOs on SSB.
The loop is 1 meter in diameter and tunes 15 & 20 meters.
(20-06-2023, 09:16 PM)Murphyv310 Wrote: [ -> ]Aye it was just a passing thought.
What annoys me is others saying it's their idea when it's blatantly not!
Yes.
