Re: LF: 160 years of Popov birthday

[<riese-k3djc@juno.com>]



wow I  have no idea,,, probably 15 yr ago,,, iron filings on one side and nickle on the other,,, dont remember what

I used of for the center

did operate using the spark from an old furnace ignition transformer

played with pressure on the filings , Quantity etc

used a fuze with the inside cleansed out,,,, was a long weekend

lots of goog;e info

 

 

Bob K3DJC

 

 

On Mon, 18 Mar 2019 00:04:58 +0000 (UTC) James Hollander <mrsocion@aol.com> writes:

Hi Bob,  what was the RF current threshold on your coherer?  I'm wondering if a virtualized coherer using the coherer principle could lower the threshold and respond quicker compared to a state of the art hardware coherer. 

            Congratulations and thanks for your email!

73,  Jim H   W5EST 

 

 

-----Original Message-----
From: riese-k3djc <riese-k3djc@juno.com>
To: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Sent: Sun, Mar 17, 2019 6:39 pm
Subject: Re: LF: 160 years of Popov birthday

why not build one,, i  did several years ago,, took a lot of RF to activate but it worked

 

Bob K3DJC

 

On Sun, 17 Mar 2019 22:02:36 +0000 (UTC) James Hollander <mrsocion@aol.com> writes:

Hi Roman,  

 

Yes, I wonder how to do it in software.  As you know, a coherer has a large number of particles that statistically become more closely packed and connective in response to RF voltage or current applied to them.  

 

Since software defined radios have replaced many functions in short wave receivers with software on a computer, why not envisage some software virtualization of the coherer.  We've been trained to think a coherer is a quaint relic of the first days of radio.   But what truly are the performance limits of the coherer in principle and what improvements starting from the coherer concept might actualize advances or technological alternatives in radio?   Perhaps ultimately the answer is "None",  but has  the question even been probed.

 

I recognize most of us may not be in a position to inquire into the matter, but I want to put the topic forward.   If there's any group that includes someone with the background and interests to potentially think through this software challenge, they're probably in this LF/VLF/ULF/SLF/ELF group now or in the future!

 

TU & 73, Jim H    W5EST 

 

 

-----Original Message-----
From: Roman <rw3adb@YANDEX.ru>
To: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Sent: Sun, Mar 17, 2019 7:34 am
Subject: Re: LF: 160 years of Popov birthday

Hi Jim!

PSE more info about your software, OM!
VY interesting.

> FB, Roman. BTW, I've wondered how one could write radio detection software to act like a coherer and improve upon its principle. The software would be a "swarm detector" working on the collective interaction of many elemental pieces or software elements. 73, Jim H W5EST
--
73!

Roman, RW3ADB