[time-nuts] AN/URQ-10A - on frequency doublers

[Glen English VK1XX]

good info Rick

ROY - I have spiced up in LTSPICE a doubler and 4 harmonics which you 
can vary the amplitudes of the harmonics in the current  sources I1, I2, 
I3, I4.  There is a basic tank circuit on the output which you can 
connect/ disconnect etc.

www.cortexrf.com.au/5_meg_doubler.asc

Rick , you are right.... the harmonics on the source really do mess with 
it...

you could also do a digital frequency doubler.  that's easy, dependson 
ur jitter spec...... . or a PLL using a DBM as a phase detector with a 
regenerative divider if you really want to knock yourself out..... many 
cats and skins....

cheers




On 18/07/2019 11:54 PM, Richard (Rick) Karlquist wrote:
> The 5071A has a chain of doublers from 10 to 320 MHz.
> One thing I learned in designing this is that it
> is important to drive the doublers with pure sine
> waves.  It might seem like if I double from 10 to