Updating a NC-300 and am having a tough time tracking down a 2135 KHz
and 2295 KHz crystal. Does anybody have a source for these guys?
Please reply to this group or email to:

Many thanks and 73

-Bob
KE7GNU

"hayseed" wrote in message
m...
Updating a NC-300 and am having a tough time tracking down a 2135 KHz and
2295 KHz crystal. Does anybody have a source for these guys?
Please reply to this group or email to:

Many thanks and 73

-Bob
KE7GNU


JAN Crystals OR ICM should be able to fix you right up - that is their
business.
http://www.jancrystals.com/6.jpg

JAN Crystals 800-526-9825: 813-936-2397
P.O. Box 06017: 2341 Crystal Drive: Crystals
Ft. Myers, FL 33906-6017

================
International Crystal Manufacturing
10 North Lee Street . Oklahoma City, OK 73102
Toll Free Phone: 1-800-725-1426 . Toll Free Fax: 1-800-322-9426
Phone: 1-405-236-3741 . Fax: 1-405-235-1904
Email: hey maintain data on all the old Boatanchor rigs as to
crystal requirements!
Call us today at 1-800-725-1426, fill out our contact form, email us at
or request an online quote
http://www.icmfg.com/

w9gb wrote:

================
International Crystal Manufacturing
10 North Lee Street . Oklahoma City, OK 73102
Toll Free Phone: 1-800-725-1426 . Toll Free Fax: 1-800-322-9426
Phone: 1-405-236-3741 . Fax: 1-405-235-1904
Email: hey maintain data on all the old Boatanchor rigs as to
crystal requirements!

Sent email inquiry to ICM and they came back with a very quick reply.

Each crystal would cost about $57.00!!! Yikes!!
Sounds like it is time to kludge up an oscillator.

Thanks for your help.

-Bob

"hayseed" wrote in message
m...
w9gb wrote:

================
International Crystal Manufacturing
10 North Lee Street . Oklahoma City, OK 73102
Toll Free Phone: 1-800-725-1426 . Toll Free Fax: 1-800-322-9426
Phone: 1-405-236-3741 . Fax: 1-405-235-1904
Email: hey maintain data on all the old Boatanchor rigs as
to crystal requirements!

Sent email inquiry to ICM and they came back with a very quick reply.

Each crystal would cost about $57.00!!! Yikes!!
Sounds like it is time to kludge up an oscillator.

Thanks for your help.

-Bob

That seems a bit high -- but maybe an odd crystal holder? or
high precision spec?

I would also try JAN crystals -- for price shopping.

I am not familiar with the National -- odd crystal holder?

w9gb

"hayseed" wrote in message
m...

Updating a NC-300 and am having a tough time tracking down a 2135 KHz and
2295 KHz crystal. Does anybody have a source for these guys?
Please reply to this group or email to:

Many thanks and 73

-Bob
KE7GNU




OK, Bob I see - what you are doing (in your update).

I just dealt with this issue on my Drake R-4C. Pain in the %@*$ to track
down -- I had to replace 5 crystals and 1 carrier oscillator crystal -- that
had all drifted badly over past 30 years (looks like the crystal batch from
ERIE for this late serial number 27xxx aged poorly).
Good news is that 6 new precision crystals from JAN -- and it is running
very well again !

National NC-300 Information from Nick England, KD4CPL - Chapel Hill, NC
http://www.virhistory.com/ham/nc300/nc300.html
http://www.qsl.net/n4xy/rcvr_national.html
http://bama.sbc.edu/national.htm

First IF frequency is 2215 kHz
Second IF frequency is 80 kHz

SO, 2215 is the crystal filter and
2295 is the second IF conversion oscillator (that is important ! )
I would guess that 2135 is the other (low side) oscillator.

Fairly important and this problem was mentioned in the NC-300 service
bulletin (FSN-48) --
circa August 4, 1958 - adding crystal control to remove drift problems !!
(BAMA) -- page 16 of 18
ftp://bama.sbc.edu/downloads/nationa...sn/300fsn.djvu

w9gb

"hayseed" wrote in message
m...
w9gb wrote:

================
International Crystal Manufacturing
10 North Lee Street . Oklahoma City, OK 73102
Toll Free Phone: 1-800-725-1426 . Toll Free Fax: 1-800-322-9426
Phone: 1-405-236-3741 . Fax: 1-405-235-1904
Email: hey maintain data on all the old Boatanchor rigs as
to crystal requirements!

Sent email inquiry to ICM and they came back with a very quick reply.

Each crystal would cost about $57.00!!! Yikes!!
Sounds like it is time to kludge up an oscillator.

Thanks for your help.

-Bob

Make sure that ICM did not quote you for:

1. A high precision crystal (they may do that for this one since it
determines IF)

2. Entire L6 assembly
( Replacing the entire L6 shield can -- as described in W1FSN NC-300
revision - page 18 of 18)
ftp://bama.sbc.edu/downloads/nationa...sn/300fsn.djvu

ICM likely has the documentation for that entire mod -- and may be
referencing that -- and may be more than you want.

w9gb

w9gb wrote:

Make sure that ICM did not quote you for:

1. A high precision crystal (they may do that for this one since it
determines IF)

2. Entire L6 assembly
( Replacing the entire L6 shield can -- as described in W1FSN NC-300
revision - page 18 of 18)
ftp://bama.sbc.edu/downloads/nationa...sn/300fsn.djvu

ICM likely has the documentation for that entire mod -- and may be
referencing that -- and may be more than you want.

w9gb

I was interested in doing the mods as outlined in the above referenced
field service notes.
I had downloaded the info from bama a long time ago and am just now
starting to get the rx into working codition.

Xtals are used in upper/lower side band select which replaces L6
assembly. I a surprised to
learn that ICM is able to research the NC-300 that well. These guys must
be good!

"hayseed" wrote in message
m...
w9gb wrote:

Make sure that ICM did not quote you for:

1. A high precision crystal (they may do that for this one since it
determines IF)

2. Entire L6 assembly
( Replacing the entire L6 shield can -- as described in W1FSN NC-300
revision - page 18 of 18)
ftp://bama.sbc.edu/downloads/nationa...sn/300fsn.djvu

ICM likely has the documentation for that entire mod -- and may be
referencing that -- and may be more than you want.

w9gb
I was interested in doing the mods as outlined in the above referenced
field service notes.
I had downloaded the info from bama a long time ago and am just now
starting to get the rx into working codition.

Xtals are used in upper/lower side band select which replaces L6 assembly.
I a surprised to
learn that ICM is able to research the NC-300 that well. These guys must
be good!

Royden R. Freeland founded International Crystal Manufacturing Company
(ICM) -- a true garage operation start in early 1950s. He was a great asset
to the radio industry.
http://www.icmfg.com/

In 1978, Royden Freeland Sr. and his wife were killed in an airplane crash.
The ICM operation was then continued by their son, Royden Freeland Jr.
taking day to day control of operations.

They have a very DEEP knowledge library of radios.

They were a staple for the land mobile radio service (Motorola, GE, RCA,
Johnson, etc.)
and Collins selected them as a major crystal supplier.

They have traditionally been amateur radio / experimenter friendly.

w9gb

hayseed wrote:
w9gb wrote:

Make sure that ICM did not quote you for:

1. A high precision crystal (they may do that for this one since it
determines IF)

My suspicion is that this radio is sufficiently drifty to begin with that
using a high precision crystal is probably a waste of money. But I could
see someone recommending it, and it wouldn't hurt anything.

2. Entire L6 assembly
( Replacing the entire L6 shield can -- as described in W1FSN NC-300
revision - page 18 of 18)
ftp://bama.sbc.edu/downloads/nationa...sn/300fsn.djvu

ICM likely has the documentation for that entire mod -- and may be
referencing that -- and may be more than you want.

I rather recommend this modification.

Xtals are used in upper/lower side band select which replaces L6
assembly. I a surprised to
learn that ICM is able to research the NC-300 that well. These guys must
be good!

They are good, and they have been around a long time. They were making
the kits for the NC-300 when it was a current production product, and
they still have all the original documentation for everything they ever did.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."