Hello Jim, All
It seems my post went directly to you.
It was supposed to go through the Drakelist to you!
Anyways......
No, it is definitely the better, non contaminating welding process quality.
Look for instance at this place:
http://www.stabitech.nl/QuartzCrystalHolderTypes.htm
I remember reading about this at a number of different places though.
It is being used since long before rohs was "invented".
But agreed, lead-free / rohs compliance could also be a valid reason
for using this type of crystal holder for manufacturers.
Sending this now to the correct email address, "drakelist@zerobeat.net"
as intended the first time....... ;-)
Henry - PA0HJA
On 12/21/2011 5:47 PM, Jim Pruitt wrote:
Hello Henry.
You could be right or it could just be industry's way of being rohs
compliant. I see this frequently when trying to order any electronic
parts. I might have an old part number but later find the part is
still available under a different number and the new number uses no lead.
Thank you.
Jim Pruitt
>>> On 12/20/2011 at 12:58 PM, <henry.vredeg...@gmail.com> wrote:
Hi All,
I always thought that HC48/U is the preferred, higher quality type
than the HC6/U types?
Because of the welding process instead of soldering, the crystal
material itself is less prone to impurities coming from the soldering
process vapors getting into the crystal lattice when sealing the unit?
73's,
Henry - PA0HJA
On 12/20/2011 4:54 PM, Jim Pruitt wrote:
Hello Don and the group.
Please do not quote me but if memory serves me correctly the HC-6 and
the FT243 have the same center to center pin spacing, just the
diameter of the pins is different with the FT-243 being bigger (as in
same diameter as a pin from an old octal tube or .093" od). Also I
do not think that International Crystal still has HC-6/U holders as
they now call then HC-48's. I once tried to have a discussion with
International Crystal about that and got no answer but if you look at
their web site. That is just a nomenclature difference but it makes
it hard to go to a manufacturer's web site and find what you are
looking for without knowing that the old nomenclature no longer
exists but what you are looking for is called something else and
still exists.
I think Bry Carling's web site has a crystal socket page that shows
them very well. From Bry's web page at:
http://www.af4k.com/crystal_holders.htm
he lists the HC6 and FT243 as:
FT243, 2 pins, spaced 0.486" and .093" dia.
HC-6/U - Crystal, metal can, spacing 0.486", pin dia. 0.050"
Holder Type Pin Spacing Pin Diameter Height Width Thickness
HC-5/U 0.812 0.156 2.20 1.82 1.60
HC-6/U 0.486 0.050 0.78 0.76 0.35
HC-10/U (Note A) 0.060 1.10 - 0.56D
HC-13/U 0.486 0.050 0.78 0.76 0.35
HC-17/U 0.486 0.093 0.78 0.76 0.35
HC-18/U (Note B) - 0.53 0.40 0.15
HC-25/U 0.192 0.040 1.53 0.76 0.35
FT-243 0.500 0.093 1.10 0.90 0.40
FT-243 - Dimensions: 13/16" X 3/8" X 1-1/8" tall
Dimensions: 0.8125" wide X 0.375" deep X 1.125" tall plus pins.
Dimensions: 20.6mm X 9.5mm X 28.6 mm
With 2 pins, spaced 0.486" (12.3mm) and pin diameter = 0.093" (2.4mm)
Pin length =3/8" (9.5mm).
He lists the HC48 as:
HC-48/U - Crystal Unit, thin pins, same as HC-6/U but welded.
and that is also what you will get from International Crystal.
I just looked at Jan Crystal's web page at
http://www.jancrystals.com/chart.html and they still list them as
HC-6/U. I found their web site hard to use from an ordering
standpoint but they have been around for years.
I do not know if that sheds any light on the discussion or not but
the HC48 versus HC6 discussion caught me by surprise at International
when I was looking for crystals a few years ago. By the same token,
HC25 (small plug in crystals liked used in the old Drake crystal
controlled 2 meter transceivers) is something like HC50 now and the
HC18 wire lead is now the common HC49. Again the HC49 and HC50 or
HC25 and HC18 if you will, is like the HC6 and FT243 in that the pin
spacing is the same but the pin diameter is different.
HC-18/U - Crystal - same as HC-49/U but soldered
HC-25/U - Crystal - Same as HC-49 but with rigid pins.
(also same as HC50/U but soldered)
So I gather from Bry's discussion that the difference between the HC6
and the HC50 is that the HC6 is has a soldered on shell where the
HC50 has a welded shell. Same for the HC25 and HC50 in that the
HC-25 is soldered and the HC-50 is welded. Why the holder
nomenclature is different just because they used a different method
to attach the top cover is beyond me but then I am not in manufacturing.
Thank you.
Jim Pruitt
>>> On 12/19/2011 at 7:15 PM, <d...@martineer.net> wrote:
Lee,
I'm really not understanding your posts I have seen on several venues
today. There's not really a coorelation between the HC-6/U crystal
and the FT-243, unless my old memory is worse than I think. Aren't
those two separate types of crystals, different spacing, different
pin size, etc???
As far as HC-6/U's go, you can buy them from International Crystal,
in Oklahoma City for around $20 per crystal and know that they meet
or exceed the original specs that Drake, Collins, etc used when these
rigs were new. Why go to all the trouble of ordering overseas??
Now, if Vincent makes FT-243 type crystals, or HC-6/U types with
FT-243 sized pins, then I DO understand and would be interested. I
miss being able to buy C-W crystals since they went out of business.
73,
Don, WB5HAK
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