[Boatanchors] Collins S-Line Knob Weights #2

[Rodney Bunt]

Glen,

I went to the local Tyre dealer and asked him for a couple od tire weights, did't even charge
me...

Used wire cutters to chop them up into "square chunks" and placed them in the back of the knob, a
National NC-240D knob in this case, used epoxy glue and dribbled it in, same result.

Regards,

Rodney

--- Glen Zook <gzook@yahoo.com> wrote:
> I recently came into posession of an additional 75S-1
> receiver that I have finally put into operation as a
> second receiver for working DX on 40 and 80 meter SSB.
>  This replaced the 75S-3 receiver that I traded off a
> couple of years ago for a really nice 75A4 (the 75S-3
> was in just good condition but worked great - I just
> couldn't pass up the deal for the 75A4 - it was the
> other guy's idea).
> 
> Since I "transceive" with my 75S-3A / 32S-3
> combination, and since the DX is usually transmitting
> outside of the 200 KHz bandswitch allotment, use of a
> second receiver is pretty much mandatory unless you
> want to go through the effort of uncabling the
> receiver from the transmitter.  Also, use of two
> receivers allows listening to the frequency on which
> the DX station is listening and thus you can "zero
> beat" the station that is being worked, etc.
> 
> Anyway, although I have the Collins "weighted" knobs
> added to my other S-Line receivers, the 75S-1 didn't
> come "standard" from the factory with the weighted
> knob.  Since the tuning of an S-Line PTO is MUCH
> smoother with a weighted knob I decided to add weight
> to the knob.
> 
> Of course this is pretty much "old hat" and there have
> been various methods of doing this presented on all
> sorts of websites and even on the various Internet
> reflectors.  Each article on doing this used various
> items to accomplish the weighting and what I am doing
> is giving still another item to be used.
> 
> Several years ago for Christmas, my 3 daughters bought
> me a reproduction 1851 Colt Navy revolver which is a
> "black powder" side arm that fires a .36 calibre
> bullet.  Actually, what is used are lead balls that
> are 0.375 inches in diameter.  Well, although I carry
> this weapon doing Living History concerning the Civil
> War, I actually have never live fired it.  I have
> fired "blanks", but never put a single ball into the
> chamber to live fire.
> 
> Therefore, I had a full box of 100 0.375 diameter lead
> balls that my daughters had obtained to go along with
> the weapon.  The cost for the box of 100 balls was
> $5.95 and they came from a local gun shop.
> 
> Anyway, it seems that these are just "made" for adding
> weight to the S-Line knobs.  On the knob that does not
> have the finger hole and has the 3 ridges inside, each
> compartment just holds 3 of these lead balls.  I
> applied a liberal amount of fast hardening epoxy to
> the compartments and put the balls into the knob.  It
> is best to let the epoxy "set" for a couple of minutes
> before adding the balls to make sure that they stay
> along the outside of the knob.  Then, after a couple
> of hours I added a second layer of balls thus making
> the weight of the knob about the same as the "factory"
> weighted knob.
> 
> On the knobs with the finger hole, there are no ridges
> inside and you can get 10 balls around the perimeter
> of the knob.  Again, put in the epoxy and let it set
> up a couple of minutes and then put in the balls.  Add
> the second layer several hours later.
> 
> The second layer of lead balls comes out just a
> fraction of a inch below the level of the skirt on the
> knob thus making the entire assembly fit perfectly.
> 
> By adding the weight to the knob the 75S-1 now tunes
> much smoother making "split" operation on 80 and 40
> meters much easier.  The knob, plus the connection box
> that I manufacture which allows either receiver to
> control the transmitter, makes this type of operating
> much easier than using a separate receiver with a
> separate antenna for "split" operation.
> 
> Anyway, about $6 for the box of lead balls gives
> enough lead to do at least 5 knobs and they are much
> easier to handle than trying to use the small "shot"
> pellets that are often used to add weight.  Also, you
> don't have to buy a large quantity of material to get
> enough to do a relatively small number of knobs.
> 
> Glen, K9STH
> 
> =====
> Glen, K9STH
> 
> Web sites
> 
> http://home.attbi.com/~k9sth
> http://home.attbi.com/~zcomco
> 
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