"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