[Milsurplus] Milsurplus Digest, Vol 187, Issue 37

[Dennis Monticelli]

Here is what I did with the output lamp in my RT-3 transmitter (T-784).

The existing #47 lamp with a 20 ohm shunt resistor consumed about 2W, which
I deemed wasteful.  So I inserted a #49 (which has the same base) and
reduced the value of the shunt resistor (by shunting it further) until I
got only a 2V drop at full output instead of the 5V drop with the stock
circuit.  The loss was much less (0.35W) and I don't miss the extra
brightness of the #47.

Dennis AE6C



On Fri, Nov 15, 2019 at 3:41 PM <milsurplus-request at mailman.qth.net> wrote:

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>    1. GRC-9  Dial Light experiment 3-A (Hubert Miller)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Fri, 15 Nov 2019 23:40:39 +0000
> From: Hubert Miller <Kargo_cult at msn.com>
> To: Military Surplus Mail List <milsurplus at mailman.qth.net>,
>         "main at Army-Radios.groups.io" <main at army-radios.groups.io>
> Subject: [Milsurplus] GRC-9  Dial Light experiment 3-A
> Message-ID:
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> MWHPR22MB0269AF10192BFB8990A211A8E4700 at MWHPR22MB0269.namprd22.prod.outlook.com
> >
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> Content-Type: text/plain; charset="us-ascii"
>
> Friends, here is a dial view GRC-9 receiver with a ' Maglite Solitaire
> 1-Cell AAA ' bulb bought from our local Ace hardware.
> The bulbs are in a 2 - pack for about $2.50
> The adapter I made uses the base from a bayonet bulb.
> Draw is 250 mA at 1.6 VDC.
> This was not real hard to make, some minutes, but it was not fun. It is no
> Heathkit. It looks kinda crude, but hell, it works
> and I'm going to leave it plugged in.
> I have some other photos. I recently got a Photobucket account and I might
> post them there, but I have this nagging feeling
> I need to get back to real life matters now. Maybe someone else could
> receive my photos and text on how I did this and
> post wherever.
> It was very difficult to get a decent photo, as the camera has a hard time
> dealing with the bright dial against the ambient
> dark.
> -Hue Miller
>
> [A picture containing building, train, outdoor, sewing machine
> Description automatically generated]
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