[MRCA] [MMRCG] GRC-9 output indicator

[Tim]

Hi Ray - Yep, the lamp is a cheaper, smaller, rugged but effective tuning
indicator.  Much more light output than the typical NE-51 pilot
light...Quite bright in daylight in Hi Power CW, less so in low power AM
but mine is still quite visible outside.  The cross-polarization light
attenuator would be very helpful at night...
Here's a shot of mine lit while indoors:
https://www.n6cc.com/wp-content/uploads/IMG_3953.jpg
Tim
N6CC

On Wed, Nov 20, 2024 at 7:49 AM Ray Fantini via groups.io <RAFANTINI=
salisbury.edu at groups.io> wrote:

> More GRC-9 questions! What type Neon bulb is I101, that’s the neon bulb
> that you tune to max. Think it’s a NE-47 but not certain.
>
>
>
> Commentary and opinion beyond this point, if easily offended do not read!
>
> Ok, I get it that you needed some method to tune to max, the old WW2 stuff
> always used a antenna current meter and for some reason in the fifties
> there was by cost cutting or because of size restrictions the idea of using
> a neon bulb to tune to max bulb. These are field radios, to be used in the
> field or attached to a vehicle for use in the field. How in the Hell where
> you supposed to see this little neon light in the daylight?
>
> Ok, so maybe the big black tube around the bulb helps and will admit that
> until I started this project never used a GRC-9 before, although I now have
> like five of them in the shop all at once but just looking at it have to
> wonder how that was supposed to be used. Speculation is that you would drag
> out a field strength meter and tune the radio that way. Just using vertical
> output have no issues generating power into a fifty ohm load and inside
> with the one good neon bulb I see it ok but already know where you set the
> antenna tuning control has a big difference in output power and with a week
> display like the original design have to wonder how this is used outside in
> the daytime?
>
>
>
> Ray F/KA3EKH
>
>
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