NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Kollsman periscopic sextant mount
From: Gary LaPook
Date: 2015 Jan 4, 09:50 -0800
From: Paul Brewer <NoReply_Brewer@fer3.com>
To: garylapook@pacbell.net
Sent: Sunday, January 4, 2015 8:11 AM
Subject: [NavList] Re: Kollsman periscopic sextant mount
From: Gary LaPook
Date: 2015 Jan 4, 09:50 -0800
I'm happyest with the 6 Volt bulbs in my Kollsman instuments, Periscopic, and in my MA-1 and MA-2. Buy a little battery holder from radio shack that holds 3 AA, it is small and light and I attach it with some velcro on to of the averager. BTW, the 9 volt batteries cost a lot more than the AA batteries. The only sextant that I use 24 volt bulbs in is one of my periscopic one that has the electronic averager
since the averager requires 28 volts. I made that power supply for that one since the averager eats 9 volt batteries.
BTW, I have
complete manuals for the Kollsman instruments if you need them. I already posted one, here is a llink
gl
From: Paul Brewer <NoReply_Brewer@fer3.com>
To: garylapook@pacbell.net
Sent: Sunday, January 4, 2015 8:11 AM
Subject: [NavList] Re: Kollsman periscopic sextant mount
Hi Dave, The International colour code puts red as 2 so I doubt that is what its about. Possibly, and here I speculate, there were some different voltage bulbs used in the vacinity of the sextant. I had hundreds of the things at 24Volts for the dash board of an Argosy. I remember a cardboard box with at least 2 pounds weight of the 24V lamps. As I don't remember any sextant on the Argosy there were much fewer of the 3V version, those had arrived from stores occasionally by mistake. The 3V versions were kept in a sealed box marked �V do not use! LEDs are current devices so what you need to do is have sufficient voltage then use a resistor in series to reduce the current to the correct value. I have hundreds of ultra brights here that I don't use because they are too high a forward voltage for my 3V supply constraint.Mostly they are around 4V with varying currents depending on type. Tell me what voltage you want to use and I can sort you out an assortment with any required resistors. I would recomend something like 3 AAA or AA cells in a holder. That gives you 4.5V and enough life for a seasons use. I have a couple of Kollsmans one German the other ex Nimrod. I can't get at them at the moment otherwise I would do some experiments myself. I appear to have lost your email address I am at g4osj uk, I suggest we take this up off list so as not to bore the others. Paul. On 3 Jan 2015 14:16:31 -0800, you wrote: >Hello Paul. Long time no hear from you. Yes it's a black back red spot. That's what makes it so strange, it's a Hughes'/Smith's bulb. Any idea how the red spots got on them? There must have been a very bored airman one day. It's not the old resistor spot code is it? I find it hard to believe that I might have crept down one night and slipped it in there. I don't ever recal having the Kollsmans, the Hughes, and the Smiths out at the same time. Still anythings possible these days! I almost bought two more 9V batteries this afternoon to try the Kollsman on 27V, but I had a last minute fit of meaness at the check out, so I'll have to wait until my next Amazon order. I'm only looking for 80mA max, and I don't really need the counters light, so that would mean 40mA max. On the led front, do you know the best voltage for cheap ultra bright leds, and do you need a resistor in series like the old ones? > >[PLAIN TEXT VERSION OF MESSAGE AUTO-GENERATED. ORIGINAL MAY INCLUDE MORE CONTENT] >---------------------------------------------------------------- >NavList message boards and member settings: www.fer3.com/NavList >Members may optionally receive posts by email. >To cancel email delivery, send a message to NoMail[at]fer3.com >---------------------------------------------------------------- > > > >: >http://fer3.com/arc/m2.aspx/Kollsman-periscopic-sextant-mount-DavidPike-jan-2015-g29913
