There are a myriad of ways to do it if you're interested, however don't
underestimate the accuracy you can achieve with your ears and ability to
count when you get the levels equalized. If you count 6 noise peaks in
60 sec, you're within 0.1 Hz.
Something that hasn't been mentioned [and that I only alluded to in a
previous post] is doing this during the tone-free minutes on WWV. The
tone modulation can make it very difficult, and in some cases your
result can be off by the frequency of the tone.
73,
Fred K6DGW
Sparks NV USA
Washoe County DM09dn
On 12/18/2016 10:56 AM, Brendon Whateley wrote:
Depending on why you want the accuracy, I think you could improve things by
building a phase comparator to "listen" to the radio output frequency
against a local reference. That would allow you to get much closer than
using your ears as a phase detector. That should get you accuracy of a few
% of 1Hz at your frequency you are measuring.
If you are really serious about accuracy, you can build a frequency
reference based on the WWV transmissions that will get you to within 1 part
per billion at 1MHz without too much trouble.
There was a QEX article recently, which you can find on the web at
http://www.arrl.org/files/file/QEX_Next_Issue/2015/Nov-Dec_2015/Magliacane.pdf
.
I'm sure that spending money on a GPS reference would be quicker, but less
fun than building a project.
If you go down that road, you'll be well on your way to winning frequency
measuring contests!
- Brendon
KK6AYI
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
