[R-390] Green Grears

[Dan Merz]

Roger,  thanks for the overview on green gear.  I haven't studied or even
looked at the manual I have beyond the schematics so I need to do a little
homework on the mod's that you remembered.  I have TM-11-5820-557-35 which
is a field and depot maintenance manual from 1962 that I downloaded as a pdf
file.  I see the types of mod's you mentioned but no dates attached to them.
The one thing that caught my eye was two ways that the green gear is used
depending on whether mod 1 is present or not.  In one case the green side
faces the rear and doesn't engage the clutch gear.  With mod 1 the green
side faces forward and engages the clutch gear.  I haven't gotten far enough
with my receiver to know the significance of this,  but probably obvious
when trying to use it??  Does this ring a bell?  Later in the manual there
is mention of a difference in how the green gear works in early production
models - but no mention of whether this has to do with mod 1 or not mod 1.
This all is probably of little consequence but interesting to my idle mind,
regards,  Dan.

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Flowertime01 at wmconnect.com
Sent: Thursday, March 17, 2005 9:36 AM
To: R-390 at mailman.qth.net
Subject: Re: [R-390] Green Grears

Tom,

When used to lock up the RF deck gear train for removal, the gear
always went in the same place.

There are several 6/32 taped holes in the R390 gear train frame. At least
two 
of them
will hold the green gear without getting in the way when not in use. Us 33's

would use what ever location got under our hands first. Where you find a
gear 
mounted today is no clue as to how it was factory assembled. There are some 
old TM graphics that show gear storage location.

The original R390 TM was photographed from an original production first run 
Collins. Later changes to the TM were mostly to correct text (and add a few 
missing sections). The photos did not change. I do not think we can infer 
anything sacred about the receivers from the location of the gear.

I do not have my R390 TM at hand, Its still packed in the moving cartons. 
There are differences in the RF deck caps that were added in later
production 
runs. If someone has a TM they may be able to list them for you. There is a
short 
note paragraph in the TM that list what was added when. You can look at your

RF deck someday and see if it was real early production Collins or a later 
production run.

Roger KC6TRU
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