K3, k4 Black knobs
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OK, I operate portable and often at night and lighting has to be managed to
reduce critters of the night dive bombing me when operating. Wearing a head mounted light causes the critters to go into a frenzy so does not help. I often wonder what it would be like If the buttons and/or knobs could be either back-lit or maybe they could be lighter in color to help nighttime operation. As it stands, the k3 is very hard to see if i need to use any front controls. Placing a light behind me has worked for me but at times the critters wander away from the light and use me as a target for harassment. Anyone found an alternative to what I have tried? Regards, Gary VK1ZZ K3NHL ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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On 2020-10-16 21:47:+1000, you wrote:
>OK, I operate portable and often at night and lighting has to be managed to >reduce critters of the night dive bombing me when operating. > >Regards, >Gary >VK1ZZ >K3NHL I use 2 red LED lamps. One is a fairly bright flashlight that uses 4X AAA. The other is a small flat lamp with a pushbutton-slide switch. It hangs on a locking ring, like you'd put keys on. It is push to light, slide to stay on. You can find them for sale for folks who star gaze. Been happy with them for years. When it is dark, even the little one seems pretty bright, and they don't seem to attract bugs. Double plus...I get to keep my night vision, and few bugs. I wish that the LED panels on the KX were dimmable in steps. It's way too bright. I looked into what it would take to mod the circuit, and it was not as simple as I'd like. Doable. Unfortunately, it seems, the original design didn't anticipate that folks would want to dim it. The face, keys labels, and display are all clearly visible in red light. I have not see a headlamp with red LEDs, but I'll bet it exists. You'd want it to be fairly dim, in my experience. My little CR2032-powered keychain red lamp is plenty at night once I have my night vision. I carry the big boy JIC I need it. --- I just did a quick search for headlamps, and didn't see any that I'd jump for. I am seriously thinking of putting a small patch of velcro on the keychain red LED, and then I can mount it wherever. Right now I keep it hanging from a button hole so that it is always handy in the field. I'm thinking that sticking some velcro on a ball cap bill would work fine. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Gary Gregory-2
I just looked at my keychain light. Says Night Reader by David Chandler Company
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In reply to this post by Rich NE1EE
Petzl makes red headlamps, I use them at starparties. Try REI.
73 Eric WD6DBM On Fri, Oct 16, 2020, 6:02 AM Rich NE1EE <[hidden email]> wrote: > On 2020-10-16 21:47:+1000, you wrote: > >OK, I operate portable and often at night and lighting has to be managed > to > >reduce critters of the night dive bombing me when operating. > > > >Regards, > >Gary > >VK1ZZ > >K3NHL > > I use 2 red LED lamps. One is a fairly bright flashlight that uses 4X AAA. > The other is a small flat lamp with a pushbutton-slide switch. It hangs on > a locking ring, like you'd put keys on. It is push to light, slide to stay > on. > > You can find them for sale for folks who star gaze. Been happy with them > for years. When it is dark, even the little one seems pretty bright, and > they don't seem to attract bugs. Double plus...I get to keep my night > vision, and few bugs. I wish that the LED panels on the KX were dimmable in > steps. It's way too bright. I looked into what it would take to mod the > circuit, and it was not as simple as I'd like. Doable. Unfortunately, it > seems, the original design didn't anticipate that folks would want to dim > it. > > The face, keys labels, and display are all clearly visible in red light. I > have not see a headlamp with red LEDs, but I'll bet it exists. You'd want > it to be fairly dim, in my experience. My little CR2032-powered keychain > red lamp is plenty at night once I have my night vision. I carry the big > boy JIC I need it. > --- > I just did a quick search for headlamps, and didn't see any that I'd jump > for. I am seriously thinking of putting a small patch of velcro on the > keychain red LED, and then I can mount it wherever. Right now I keep it > hanging from a button hole so that it is always handy in the field. I'm > thinking that sticking some velcro on a ball cap bill would work fine. > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Rich NE1EE
Why do you use red and not blue or green
Sent from Yahoo Mail on Android On Fri, Oct 16, 2020 at 9:18 AM, Rich NE1EE<[hidden email]> wrote: I just looked at my keychain light. Says Night Reader by David Chandler Company ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Eric Norris-2
On 2020-10-16 06:09:-0700, Eric Norris wrote:
>Petzl makes red headlamps, I use them at starparties.� Try REI. I have 2 of them, but I think that they are too bright for close work. Great for getting to and fro. Great for macro work at a campsite. The ones I have are not dimmable. I also have some by Princeton (I think). The are very nice (white), but not dimmable. I've had my light for ages, so decided to check out the Chandler site. https://www.davidchandler.com/shop/night-reader-pro/?gclid=EAIaIQobChMIjPq2nZy57AIVhIjICh1GdQRXEAAYASACEgJIIPD_BwE I like the battery life on my older Night Reader. I think that I will pick up one of these, too, because they are dimmable. I'd want it to come on dim each time, and these can. They also can come on bright immediately. Not head mounted, tho. Too bad they don't make the original Night Reader, because I use it all the time. It always comes on dim, so I don't have to hold the button to set the intensity. And I have used it regularly for years. No problems. I like my Petzl and Princeton lights, too. The convenience of head mounted. The battery lasts so long on the NR that I don't mind leaving it on and letting it hang from my shirt. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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If your looking at red lights and want to avoid the head lamp or other
such impediments to operating you should be able to incorporate the Universal Power Red Led. https://www.portableuniversalpower.com/product/nano-led-red/ I have one I bought in the USB accessory pack and quite pleased with it. You should be able to get the correct amount of light with that and be able to power it a variety of ways and directions as needed. 73, Aaron kk4kfg ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Elecraft mailing list
On 2020-10-16 13:31:+0000, Ken B wrote:
>Why do you use red and not blue or green Good question. Long answer that I'll keep short. In days of old, mariners wanted lights that they could see by, but that are not too visible otherwise. Enter red lights. Humans eyes are not very responsive to red light. More to blue, and max for green. But now imagine that you are on a ship, and you want to see stuff, but not be too visible to other ships (military use). So you use red light. It's not discernable as much as white, green, blue...from a distance. So we continue to use red. Night vision is pretty sensitive. You'd be surprised at how much you can see at extremely low levels of light. If color rendition is not an issue, then night vision, using the rods, rather than cones, is not a bad idea. But if color rendition is important (think nav charts [I sail and fly at night]), then very dim white light might be more useful. Downside is that the cones, which we use for color, are not nearly as sensitive as rods, which are for shades of grey. So there are trade offs. I don't see why green or blue could not be used at very low levels. Your eyes are way more sensitive to green, so you could possibly get by with much dimmer green or blue light than red. There is way more...but this is a good start, and I'll wrap by saying that any of the colored lights will have drawbacks. Depends on what you are looking at. For me, red is a good choice because I can see all my radio gear clearly using a red light, and because it is readily available in the low power that I want. Green and blue (and yellow, etc) are also available, but at higher power. I don't want to overwhelm my rods and then await recovery. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by kk4kfg
Another way to roll your own is to simply use an inexpensive red LED, and an inline pot. Hadn't thought of that for ages, even since I got my other red lights.
On 2020-10-16 09:52:-0400, kk4kfg wrote: >If your looking at red lights and want to avoid the head lamp or other >such impediments to operating you should be able to incorporate the >Universal Power Red Led. >https://www.portableuniversalpower.com/product/nano-led-red/ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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I am thinking of recessing some LEDs in the table in front of the equipment for low light operation and trying to decide what color would be best.
Thank you Ken WB8PKK On Friday, October 16, 2020, 10:18:48 AM EDT, Rich NE1EE <[hidden email]> wrote: Another way to roll your own is to simply use an inexpensive red LED, and an inline pot. Hadn't thought of that for ages, even since I got my other red lights. On 2020-10-16 09:52:-0400, kk4kfg wrote: >If your looking at red lights and want to avoid the head lamp or other >such impediments to operating you should be able to incorporate the >Universal Power Red Led. >https://www.portableuniversalpower.com/product/nano-led-red/ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: K3, k4 Black knobs - headlamp
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In reply to this post by Gary Gregory-2
On the subject of RED LED Headlamps, I have a Energizer - it has two red
LED's + three white (variable brightness) that cam be selected. I picked it up at Walmart a few years back. It was in the $10 - $20 range, I think it was $13.. (cost may be more now). 3xAAA batteries. I don't find a model number. https://www.walmart.com/ip/Energizer-Vision-HD-350-Lumen-LED-Headlamp-Includes-Batteries/47327204 Looks like $17 now https://www.energizer.com/lighting/headlights 73, steve WB3LGC On 10/16/20 7:47 AM, Gary Gregory wrote: > OK, I operate portable and often at night and lighting has to be managed to > reduce critters of the night dive bombing me when operating. > > Wearing a head mounted light causes the critters to go into a frenzy so > does not help. > > I often wonder what it would be like If the buttons and/or knobs could be > either back-lit or maybe they could be lighter in color to help nighttime > operation. > > As it stands, the k3 is very hard to see if i need to use any front > controls. > > Placing a light behind me has worked for me but at times the critters > wander away from the light and use me as a target for harassment. > > Anyone found an alternative to what I have tried? > > Regards, > Gary > VK1ZZ > K3NHL > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Elecraft mailing list
On 2020-10-16 14:41:+0000, Ken B wrote:
>I am thinking of recessing some LEDs in the table in front of the equipment for low light operation and trying to decide what color would be best. > >Thank you >Ken WB8PKK I installed dimmable "old-fashioned style" lamps in my shack. I like the soft glow. They dim to a deep orange, but still enough light spectrum so that I don't have color recognition problems. I'd recommend anything in this vein...dimmable white light, or similar. I kinda went with orange because of the current ideas regarding using blue lights at night when trying to wind down. It gives a soft warm light so that when I reach out to caress the knobs of the TS-830...er, adjust the finals... ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Elecraft mailing list
Red is used because the rod cells, that are used for night vision, down
to a point where they are almost quantum limited <https://www.cns.nyu.edu/csh/csh04/Articles/Rieke1998.pdf>, have a peak sensitivity for greenish blue, but are very insensitive to very deep reds, whilst they retain some sensitivity to the high frequency limit of the blue cone cells. Night vision doesn't have the same spectral response as a monochrome camera. Light of a colour to which they are sensitive bleaches the sensor pigment, reducing sensitivity. Ideally, you don't want to use the brightest red LEDs, but rather those with the longest wavelength consistent with an adequate remaining cone cell sensitivity. See <https://midimagic.sgc-hosting.com/huvision.htm> for typical colour sensitivity curves. -- David Woolley On 16/10/2020 14:31, Ken B wrote: > Why do you use red and not blue or green > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Rich NE1EE
The Petzl Tikka headlamp has a red LED mode. I like them because
they seem to be reasonably reliable compared with the other small, inexpensive, headlamps I have used. (One of the other headlamps I otherwise liked kept the battery compartment closed with a thin loop of plastic. After changing the batteries only a few times, the loop broke, the battery compartment wouldn't stay closed, and the contacts on the flopping lid no longer completed the circuit.) 73 Bill AE6JV On 10/16/20 at 9:00 AM, [hidden email] (Rich NE1EE) wrote: >The face, keys labels, and display are all clearly visible in >red light. I have not see a headlamp with red LEDs, but I'll >bet it exists. You'd want it to be fairly dim, in my >experience. My little CR2032-powered keychain red lamp is >plenty at night once I have my night vision. I carry the big >boy JIC I need it. --- >I just did a quick search for headlamps, and didn't see any >that I'd jump for. I am seriously thinking of putting a small >patch of velcro on the keychain red LED, and then I can mount >it wherever. Right now I keep it hanging from a button hole so >that it is always handy in the field. I'm thinking that >sticking some velcro on a ball cap bill would work fine. --------------------------------------------------------------------------- Bill Frantz |"We used to quip that "password" is the most common 408-348-7900 | password. Now it's 'password1.' Who said users haven't www.pwpconsult.com | learned anything about security?" -- Bruce Schneier ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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I will add, the Tikka has 3 levels of white light and one of
red. It also has a red blink mode, if you can think of a use for it. If you are trying to avoid insect attacks, the best color is one they can's see. If I remember correctly, most insects see well in the blue and UV range. 73 Bill AE6JV On 10/16/20 at 1:26 PM, [hidden email] (Bill Frantz) wrote: >The Petzl Tikka headlamp has a red LED mode. I like them >because they seem to be reasonably reliable compared with the >other small, inexpensive, headlamps I have used. > >(One of the other headlamps I otherwise liked kept the battery >compartment closed with a thin loop of plastic. After changing >the batteries only a few times, the loop broke, the battery >compartment wouldn't stay closed, and the contacts on the >flopping lid no longer completed the circuit.) --------------------------------------------------------------------------- Bill Frantz | "I wish there was a knob on the TV to turn up the 408-348-7900 | intelligence. There's a knob called "brightness", but www.pwpconsult.com | it doesn't work. -- Gallagher ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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I have a few very useful lamps and light-emitting objects. I wear a
RovyVon Aurora A7 keychain light on a bead chain around my neck 24/7. It has a handful of light levels for the main LED at the front, from 3 lumens to 650 lumens. (The older 550 lumen version had a smaller battery and a dazzler strobe on the main LED that the updated 650 lumen version does not have.) There is a lantern-mode white light on the side that has 3 functions: low, high, and a flasher mode. There's also a side-mounted UV LED (purple, "black" light). The shell of the flashlight is glow-in-the-dark blue, and is "charged up" by the UV light. When you turn off the light the case glows bright enough to see what you're doing. I find it works great for a night light that doesn't wreck my night vision, but if critters are going to be attracted to it, that may not be ideal. NEBO makes a little keychain light, the MYCRO. It has several brightness settings for the main white LED, but also has a separate RGB diode that they have set to give green or red. They're both very low light level, probably around 1 lumen, but it's enough to see by. Both are charged using microUSB and have fairly short charge times. They're both seriously durable as well. I also plan to experiment with electro-luminescent wire. I have a nice length in white and one in red. The red is particularly nice, bright enough to see and even read by. Stretch it out where you need light, turn on the inverter on the battery box, and there you go, light. My only concern is that inverter. I haven't checked to see where it's emitting the worst noise, but I would expect it to give off some amount of RF noise somewhere, so it might not be ideal for radio operating, depending on where on the spectrum that noise falls. It might be low enough and on frequencies that won't matter to Amateur use, but I can't say for sure as I haven't tested to see where the birdies are chirping. The benefit is flexibility, relatively good light output, and low cost. The potential issues are in the necessity for a high-voltage inverter that could put some nasty hash somewhere we don't want it to. It might be shieldable, I don't know. Anyone test such stuff for noise output? Gwen, NG3P -=-=-=-=-=-=-=-=- 73, Gwen, NG3P On Fri, Oct 16, 2020 at 1:34 PM Bill Frantz <[hidden email]> wrote: > I will add, the Tikka has 3 levels of white light and one of > red. It also has a red blink mode, if you can think of a use for it. > > If you are trying to avoid insect attacks, the best color is one > they can's see. If I remember correctly, most insects see well > in the blue and UV range. > > 73 Bill AE6JV > > On 10/16/20 at 1:26 PM, [hidden email] (Bill Frantz) wrote: > > >The Petzl Tikka headlamp has a red LED mode. I like them > >because they seem to be reasonably reliable compared with the > >other small, inexpensive, headlamps I have used. > > > >(One of the other headlamps I otherwise liked kept the battery > >compartment closed with a thin loop of plastic. After changing > >the batteries only a few times, the loop broke, the battery > >compartment wouldn't stay closed, and the contacts on the > >flopping lid no longer completed the circuit.) > --------------------------------------------------------------------------- > Bill Frantz | "I wish there was a knob on the TV to turn > up the > 408-348-7900 | intelligence. There's a knob called > "brightness", but > www.pwpconsult.com | it doesn't work. -- Gallagher > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Rich NE1EE
Petzl does make dimmable red ones. However, being an old-timer, I usually
use an Orion flashlight that is very dimmable, and worn around my neck or held between my teeth. The Petzl ones I have have to be cycled between red and white to get to red dim, an offensive move at a star party. The best one I have ever used was from Crazy Ed Optical, but I cannot find a replacement bulb for it. 73 Eric WD6DBM On Fri, Oct 16, 2020, 6:43 AM Rich NE1EE <[hidden email]> wrote: > On 2020-10-16 06:09:-0700, Eric Norris wrote: > >Petzl makes red headlamps, I use them at starparties. Try REI. > > I have 2 of them, but I think that they are too bright for close work. > Great for getting to and fro. Great for macro work at a campsite. The ones > I have are not dimmable. I also have some by Princeton (I think). The are > very nice (white), but not dimmable. > > I've had my light for ages, so decided to check out the Chandler site. > > https://www.davidchandler.com/shop/night-reader-pro/?gclid=EAIaIQobChMIjPq2nZy57AIVhIjICh1GdQRXEAAYASACEgJIIPD_BwE > > I like the battery life on my older Night Reader. I think that I will pick > up one of these, too, because they are dimmable. I'd want it to come on dim > each time, and these can. They also can come on bright immediately. Not > head mounted, tho. Too bad they don't make the original Night Reader, > because I use it all the time. It always comes on dim, so I don't have to > hold the button to set the intensity. And I have used it regularly for > years. No problems. I like my Petzl and Princeton lights, too. The > convenience of head mounted. > > The battery lasts so long on the NR that I don't mind leaving it on and > letting it hang from my shirt. > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Gwen Patton
On 2020-10-16 14:25:-0400, Gwen Patton wrote:
>I wear a >RovyVon Aurora A7 keychain light on a bead chain around my neck 24/7. Funny you should mention that. I have a friend in LA (the city, not the state ;-) who runs a theatre sound and light company. I was visiting one time, and went on location to "help" so that we'd have more time together. That night during a performance, an elderly person fell in the theatre, and as I was nearby with a light in my pocket, I hustled over to help the staff who responded quickly, but without a light. Later, J asked if there were anything that I /didn't/ have in my pockets. Well, sure...it was suit and tie, after all ;-) Y'just never know... ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by David Woolley (E.L)
On 2020-10-16 17:35:+0100, David Woolley wrote:
>Red is used because the rod cells, that are used for night vision, down to a point where they are almost quantum limited <https://www.cns.nyu.edu/csh/csh04/Articles/Rieke1998.pdf> > >See <https://midimagic.sgc-hosting.com/huvision.htm> Thanks for posting these links. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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