[hpsdr] Penelope locked to ext 10 MHz Atlas bus ref

[Phil Harman]

Hi Joe,

That is nice to know!  The main point seems to be we need to drive C16 
from a nice low impedance source so your choice of a TTL inverter was a 
good one.

We use the same locking scheme on Mercury so you are well prepared for 
that when its released shortly.

Again, thanks for the feedback!

73's Phil...VK6APH




Quoting Joe Martin K5SO <k5so at valornet.com>:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Phil VK6APH and All,
>
> Rather than reporting a problem to you, I thought you might like to  
> hear of a small success out here in the field for a change, hihi.  
> I'm  pleased to be able to report that I had no problem at all in 
> locking  my Penelope TX to an external 10 MHz source (Rb vapor 
> frequency  standard) via the Atlas board using a simple conditioning  
> circuit  consisting of a 5V Zener clipping diode on the input of a 
> TTL inverter  (actually, a 7400 NAND with inputs tied together) with 
> a resistor  divider on the output to lower the 5V TTL level to 3V max 
> level to pin  C16 on the Atlas board bus.  It seems to work great; 
> after selecting  Atlas as the 10 MHz source on the 
> Setup/General/HPSDR tab in PowerSDR,  of course.
>
> Best of luck to you in getting Mercury closer to beta testing pretty  
> soon!!  I'm sure excited about that prospect!
>
> 73,  Joe K5SO
>
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