[Milsurplus] R-390 Meter

Wed Feb 14 15:15:29 EST 2018

Also looks identical to the meter in my Collins R-392. 

NE5DX...... Don

de NE5DX, Don in Giddings, TEXAS, USA. EM10ME  
    Alternate Address;  don at ne5dx.com    
           o00o---°(_)°---o00o

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Sent: Wed, Feb 14, 2018 9:30 am
Subject: Milsurplus Digest, Vol 166, Issue 22

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Today's Topics:

   1. Re: R390 Meter? (Ray Fantini)
   2. Re: R390 Meter? (Todd, KA1KAQ)

Attached Message

From

Ray Fantini <RAFANTINI at salisbury.edu>

To

Clare Owens <clare.owens at gmail.com>; milsurplus at mailman.qth.net <milsurplus at mailman.qth.net>

Subject

Re: [Milsurplus] R390 Meter?

Date

Wed, 14 Feb 2018 15:02:55 +0000

Not being critical either! Don’t know about the R-390 if it has a sealed meters or not. All of the R-390A that I have been playing around with recently are from 1961 and up. Had an R-390 years ago but don’t remember if the meter can be disassembled or not? Maybe early R-390A meters can come apart?  But the late construction ones were sealed maybe to keep people out. Also the late production ones don’t have the radiation warnings on them so maybe they did not use radium? Tritium replaced radium for use sometime in the early sixties and although I am no expert on this have some vague idea that Tritium has a relatively short half-life and within thirty or forty years is no longer dangerous, where radium has a half-life of something like fifteen hundred years so that stuff is going to be around forever as far as we are concerned.
Several people on the list know much more about this then I do and certain they will correct me if I am wrong. Long story short is all radium stuff is an issue these days, some worse than others like the TBY, also lots of the Russian aircraft stuff like the US-9 Russian version of the BC-348 are loaded with radium base paints and may be an issue in today’s world.

Ray F/KA3EKH

From: milsurplus-bounces at mailman.qth.net [mailto:milsurplus-bounces at mailman.qth.net]On Behalf Of Clare Owens
Sent: Wednesday, February 14, 2018 9:29 AM
To: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] R390 Meter?

Hi,

I didn't mean to indicate that the paint could get out of the meter on its own but rather that opening it up to clean out any particles of it that have flaked off should only be done in a Vary careful manner and that the cleanup of the work area as well as that of the worker could be a real problem.  I was sleepy at 6AM..  Sorry.

Clare

On Wed, Feb 14, 2018 at 8:34 AM, Ray Fantini <RAFANTINI at salisbury.edu> wrote:

All of the R-390A meters I have seen are completely sealed including the terminals on the back. If it has solid solder terminals it's from a R-390A if it has screw terminals its not, at least for the ones that I have been dealing with.
The last couple months have been cleaning up and checking R-390A receivers for fun and profit. The fun part is questionable considering the state of my back and the profit part is yet to be determined but so far is maybe looking doubtful. The R-390 is not commanding the high prices they were a couple years ago.

Ray F/KA3EKH

-----Original Message-----
From: milsurplus-bounces at mailman.qth.net [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of David Stinson
Sent: Tuesday, February 13, 2018 6:33 PM
To: 'David Stinson' <arc5 at ix.netcom.com>;milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] R390 Meter?

Trying again.

Can someone tell me if this is an R-390 meter?

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Attached Message

From

Todd, KA1KAQ <ka1kaq at gmail.com>

To

Ray Fantini <RAFANTINI at salisbury.edu>

Cc

milsurplus at mailman.qth.net <milsurplus at mailman.qth.net>

Subject

Re: [Milsurplus] R390 Meter?

Date

Wed, 14 Feb 2018 10:30:12 -0500

Dave: Yes.

On Wed, Feb 14, 2018 at 10:02 AM, Ray Fantini <RAFANTINI at salisbury.edu> wrote:
> Also the late production ones don’t have the radiation warnings on them so
> maybe they did not use radium? Tritium replaced radium for use sometime in
> the early sixties and although I am no expert on this have some vague idea
> that Tritium has a relatively short half-life and within thirty or forty
> years is no longer dangerous, where radium has a half-life of something like
> fifteen hundred years so that stuff is going to be around forever as far as
> we are concerned.

Wonder if that's what is in one of the meters I have here? It's a
later model, and actually glows *blue*, not the typical
greenish-yellow. Would be nice to find a mate to it.

> Long story short is all radium stuff is
> an issue these days, some worse than others like the TBY, also lots of the
> Russian aircraft stuff like the US-9 Russian version of the BC-348 are
> loaded with radium base paints and may be an issue in today’s world.

I've yet to ship anything containing radium paint but always wondered
if it was strong enough to be a reading. Radiation detectors are used
to some extent to screen items, so I never felt comfortable selling
something to someone that could disappear in shipping.

~ Todd,  KA1KAQ/4

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