Re: [Elecraft] K3S ELF 10KHz

NLK[?] at Jim Creek used to transmit on 24.8 KHz with a megawatt or a little more. I don't know if it is still active. The antenna is [was] a linear series of vertical elements down a valley, suspended by cables from the mountains on each side. I believe there were ten total, fed in two

Re: [Elecraft] K3S ELF 10KHz

We had an ELF transmitter site here in the U.P. of Michigan. Some pictures and notes about the old location are on my cabin site. http://webpages.charter.net/aj8mh-radio/mich1.html 73, Joe ( AJ8MH-Radio ) On 3/23/2017 6:55 PM, Mel Farrer via Elecraft wrote: Doug, Didn't the Navy use those

Re: [Elecraft] K3S ELF 10KHz

But “audio” could be shorthand for “audio frequencies” instead of “radio frequencies”. 10 kHz is a reasonable frequency for AF. I’m quite sure that my audio amplifiers do not amplify with compression waves. wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Mar

Re: [Elecraft] K3S ELF 10KHz

In the 80's using my Icom R71 receiver and a Burhans VLF converter, I copied the Omega Navigation system operating in the 10 to 12 KHz range. https://en.m.wikipedia.org/wiki/Omega_(navigation_system) - Jack WA9FVP Sent from my home-brew I5 Core PC -- View this message in context:

Re: [Elecraft] K3S ELF 10KHz

Cc: Elecraft Reflector <elecraft@mailman.qth.net> Sent: Thursday, March 23, 2017 7:15 PM Subject: Re: [Elecraft] K3S ELF 10KHz Yup.  Earlier in the thread Mike / KK5F pointed that out.  He was on the RX end of the circuit. We monitored stations from Perth, somewhere in the UK, east

Re: [Elecraft] K3S ELF 10KHz

Yup. Earlier in the thread Mike / KK5F pointed that out. He was on the RX end of the circuit. We monitored stations from Perth, somewhere in the UK, east coast of USA, west coast of USA, etc. etc. Must have been six or eight stations on the air. We also monitored WWVB but I think that was

Re: [Elecraft] K3S ELF 10KHz

Right. What is being transmitted is an electromagnetic field, NOT a sound field. Sound is AIR (or water) vibrating. Sound waves travel a bit faster than a foot per msec. Sonar uses sound. The system Mike is talking about is radio. Radio is an electromagnetic field, which the simultaneous

Re: [Elecraft] K3S ELF 10KHz

;elecraft@mailman.qth.net> Sent: Thursday, March 23, 2017 3:45 PM Subject: Re: [Elecraft] K3S ELF 10KHz Way back in ancient times I worked at a research lab where we had a LOT of receivers tuned to all the signals we could find below 60 kHz.  I think the lowest was 13.x.  There was an 18.x and 2

Re: [Elecraft] K3S ELF 10KHz

Yeah, I think they’re on 18.6 kHz — unless, of course, they managed to buy a VFO in the last 40 years! Doug, W7KF > On Mar 23, 2017, at 4:45 PM, Ron D'Eau Claire wrote: > > The Jim Creek antenna facility is amazing - a series of over mile long wires > (cables) for the radiator

Re: [Elecraft] K3S ELF 10KHz

] On Behalf Of Mike Morrow Sent: Thursday, March 23, 2017 3:04 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K3S ELF 10KHz I didn't understand the reference to audio either. When I on the crew of a US ballistic missile submarine more than 40 years ago, our main communications receivers were

Re: [Elecraft] K3S ELF 10KHz

Way back in ancient times I worked at a research lab where we had a LOT of receivers tuned to all the signals we could find below 60 kHz. I think the lowest was 13.x. There was an 18.x and 24.x etc. etc. We were only interested in signal strengths and plotted each signal on strip chart

Re: [Elecraft] K3S ELF 10KHz

I didn't understand the reference to audio either. When I on the crew of a US ballistic missile submarine more than 40 years ago, our main communications receivers were AN/BRR-3 units whose full frequency range was only 14 to 30 kHz. These received signals from coastal stations operating at

Re: [Elecraft] K3S ELF 10KHz

Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of thelastdb Sent: Thursday, March 23, 2017 6:57 AM To: Ken G Kopp; wa9fvp; elecraft@mailman.qth.net Subject: Re: [Elecraft] K3S ELF 10KHz Wait a second, there's a big difference between a sound pressure wave

Re: [Elecraft] K3S ELF 10KHz

coele.com>, elecraft@mailman.qth.net Subject: Re: [Elecraft] K3S ELF 10KHz Receivers THAT I AM AWARE OF begin coverage at 15 khz.  Used to listen to 16 khz from GBR in England on an RAL when lived in Florida. After all, 10 khz -is- audio. 73 K0PP On Mar 22, 2017 22:22, "wa9fvp" <re

Re: [Elecraft] K3S ELF 10KHz

Receivers THAT I AM AWARE OF begin coverage at 15 khz. Used to listen to 16 khz from GBR in England on an RAL when lived in Florida. After all, 10 khz -is- audio. 73 K0PP On Mar 22, 2017 22:22, "wa9fvp" wrote: > Is it possible, maybe in the next firmware rev, to extend

Re: [Elecraft] K3S ELF 10KHz

I would love to see this but last I asked I was told No From: wa9fvp <rep...@willcoele.com> To: elecraft@mailman.qth.net Sent: Thursday, March 23, 2017 12:25 AM Subject: [Elecraft] K3S ELF 10KHz Is it possible, maybe in the next firmware rev, to extend the bottom end of t

Re: [Elecraft] K3S ELF 10KHz

+1 Christian F1GWR Le 23 mars 2017 à 05:21, wa9fvp a écrit : > Is it possible, maybe in the next firmware rev, to extend the bottom end of > the K3S down to 10KHz? > > > > - > Jack WA9FVP > > Sent from my home-brew I5 Core PC > -- > View this message in context:

[Elecraft] K3S ELF 10KHz

Is it possible, maybe in the next firmware rev, to extend the bottom end of the K3S down to 10KHz? - Jack WA9FVP Sent from my home-brew I5 Core PC -- View this message in context: http://elecraft.365791.n2.nabble.com/K3S-and-VLF-tp7628247p7628423.html Sent from the Elecraft mailing list