[ARC5] Drift in BC-453 - more

[Robert Nickels]

On 12/12/2017 6:30 PM, Bill Cromwell wrote:
> The use of network time standards is indicated. 

My wspr transmitter is a homebrew buffer/LPF board driven by a GPIO pin 
on a Raspberry Pi with power output of 40mW.   Frequency accuracy comes 
from software that automatically corrects the clock by using network 
time protocol - or in other words, a rubidium standard somewhere.  It 
will run for weeks on a $5 Pi Zero, and has been heard as far as 
Antarctica, Australia, and New Zealand. Yes it's a thrill to see that 
you can communicate intelligence using a 20 cent logic gate as a 
transmitter!

Many older radios do not have the stability required for wspr, however 
very simple ones can do the job as well.  You just have to pick the 
right technology for the job.

73, Bob W9RAN