[time-nuts] HP 105B Modification

[Ed Palmer]

I was thinking more along the lines of an analog buffer, but you make a 
good point.  And if I want a sine wave output, I could use a simple pi 
filter to clean it up.  I have an HP 8647A RF generator that does 
exactly that on the 10 MHz reference output.

Thanks!

Ed

john.foege at gmail.com wrote:
> Ed,
>
> I have seen a hex schmitt trigger inverter used for this.
>
> The output of the OXCO goes into all 6 schmitt rigger inverter inputs and then on the output side you have the output leg of each inverter connected through 300 ohm resistance. Thusly you get 6 hex schmitt trigger inverters wired in parallel and with a combined output resistance of 50 ohms.
>
> Very simple and might be just the thing you're looking for.
>
> John
> KB1FSX 
> Sent via BlackBerry by AT&T
>
> -----Original Message-----
> From: Ed Palmer <ed_palmer at sasktel.net>
> Date: Mon, 07 Dec 2009 11:03:51 
> To: Time Nuts Mailing List<time-nuts at febo.com>
> Subject: [time-nuts] HP 105B Modification
>
> I have a late-model 105B Oscillator that's equipped with a 10811-60109 
> oscillator.  It seems a shame to have that nice 10 MHz source without 
> having access to it.  I was thinking of adding a buffer amp and bringing 
> out the 10 MHz signal.  It shouldn't be too hard, but before I reinvent 
> the wheel, has anyone done this and do you have any suggestions or advice?
>
> Thanks,
> Ed
>