[time-nuts] Advice on 10 MHz isolation/distribution (Clay)
Bob Camp
lists at cq.nu
Fri Feb 12 19:23:57 UTC 2010
Hi
It's the one that Bruce posted earlier. Actually it showed up as a double post for some odd reason. I opened the whole "hybrid" thing by referring to it.
Bob
On Feb 12, 2010, at 11:32 AM, life speed wrote:
> Message: 3
> Date: Thu, 11 Feb 2010 23:02:30 -0500
> From: Bob Camp <lists at cq.nu>
> Subject: Re: [time-nuts] Advice on 10 MHz isolation/distribution
> (Clay)
>
> Hi
>
> I suspect your noise spike can be cured by a series R-C to ground from the junction of Q1 base, Q7 base and all the other stuff. Something is going to have to set a high frequency roll off. With no coils some combo of R and C is going to have to do it.
>
> You might also try returning all of the upper emitter resistor bypasses to ground rather than B+. Another alternative would be emitter to emitter bypass as shown on the JPL schematic. I'm guessing both would improve isolation in a real world circuit.
>
> Bob
>
> Hi Bob,
>
> Please provide a link to the JPL schematic.
>
> Clay
>
>
>
>
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