[MRCA] [MMRCG] GRC-9 output indicator

[scottjohnson1 at cox.net]

That’s the adjustable dimming lens.

 

From: mrca-bounces at mailman.qth.net <mrca-bounces at mailman.qth.net> On Behalf Of Ray Fantini via MRCA
Sent: Wednesday, November 20, 2024 13:50
To: Tim <timsamm at gmail.com>; MMRCG at groups.io
Cc: mrca at mailman.qth.net; List Milsurplus <milsurplus at mailman.qth.net>
Subject: Re: [MRCA] [MMRCG] GRC-9 output indicator

 

Looking at the picture of Tim’s set figure he has got to be using some kind of Atomic or Nuclear bulb in his set! Got a couple more NOS bulbs coming in and will see what happens, also noticed that a couple of the VR150/0C3 tube wont fire and starting to think maybe this is all because after seventy years the gas leaks out or something? 

 

 

Ray F/KA3EKH

 

From: Tim <timsamm at gmail.com <mailto:timsamm at gmail.com> > 
Sent: Wednesday, November 20, 2024 11:21 AM
To: MMRCG at groups.io <mailto:MMRCG at groups.io> ; Ray Fantini <RAFANTINI at salisbury.edu <mailto:RAFANTINI at salisbury.edu> >
Cc: mrca at mailman.qth.net <mailto:mrca at mailman.qth.net> ; List Milsurplus <milsurplus at mailman.qth.net <mailto:milsurplus at mailman.qth.net> >
Subject: Re: [MMRCG] GRC-9 output indicator

 

 

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 <http://groups.io/>  <RAFANTINI=salisbury.edu at groups.io <mailto: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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