Hi Chuck
I ordered 10 xtals a week ago they are on a slow boat from China.
Then I will have to start checking each ones accuracy.
How accurate do they need to be for the filter Chuck?
Oh and Im in the UK so doubt it would be cheap enough for you to ship here.
Cheers Mark G0NMY
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On Fri, 12 Jul 2019 at 16:40, chuck adams <chuck.adams.k7qo@...>
wrote:
In a quick search I found the following.
50pcs 4.9152MHz HC-49U crystals for $7.20 USD with free shipping
to the US.
They have 296,991 lots available at the time, but that includes
the same deal for 5.000MHz and 6.000MHz. I calculate that is
$0.144/crystal unit. Let me know if you find a better deal
other than buying a 1,000 units per frequency.
It looks like to me that there is interest in a number of
people doing the NC40A. A number of us have boards that were
done in China from the layout that is in the files section
and documentation is also in the directory. As member of
the group go to the groups.io web page and log in and access
the files section. Directory is on the 5th page and has the name
/g/qrp-tech/files/Winter%202018%20Project%20%231%20--%20%20NorCal40A%20qrp-tech%20PCB
and hopefully the link will be clickable. The Gerber zip file is
second from the bottom. Old pricing was $5.49 for 10 boards. It's
now $5 but you have to add on DHL shipping for another $17 or so.
I will, in the next week, build another NC40A, but I found some
9.000MHz crystals for a nickel each and I wanted to do an
article of HC-49U vs HC-49S using the same IF frequency doing
a detailed matching procedure two ways and investigate the
results. You may have already done this. 9.000MHz used to
be the standard IF back in the day as you could do multiband
radios with the same IF frequency. It's the reason for
the LSB and USB standards for the ham bands, which you are
free to ignore at your own choosing.
Using the 9.000MHz IF frequency means raising the VFO by an
additional 2.0MHz for the NC40A, but that doesn't bother me.
FYI
chuck, k7qo, shopping the Internet for deals
