Charles,
On 05/12/2016 10:34 AM, Charles Steinmetz wrote:
Bruce wrote:
For even lower flicker noise using a mixer assembled using
2NA's as diodes is even quieter as NIST have shown.
Note that mixers built with 2Ns only have lower noise than good schottky DBMs below
about 200 Hz
>> OK, I can see that. I had been wondering about how to build it out, but it
>> seems like each module should be on its own PCB for isolation. That keeps
>> the costs down, except for the numerous SMA jumpers - and the eventual big
>> box.
>>
>> Bob
>
Bruce wrote:
> For even lower flicker noise using a mixer assembled using
> 2NA's as diodes is even quieter as NIST have shown.
Note that mixers built with 2Ns only have lower noise than good schottky
DBMs below about 200 Hz -- above that, schottky DBMs are better (see Figures 4
and
't the DDS spurs cancel out across the 2 DBMS?
>
> Bob
>
> On Wed, 5/11/16, Bruce Griffiths <bruce.griffi...@xtra.co.nz> wrote:
>
> Subject: Re: [time-nuts] DMTD was: high rev isolation amps
> To: "Bob Stewart"
en wondering about how to build it out, but it
> seems like each module should be on its own PCB for isolation. That keeps
> the costs down, except for the numerous SMA jumpers - and the eventual big
> box.
>
> Bob
>
> On Wed, 5/11/16, Bob Camp <kb...@n1k
wn, except for the numerous SMA jumpers - and the eventual big box.
Bob
On Wed, 5/11/16, Bob Camp <kb...@n1k.org> wrote:
Subject: Re: [time-nuts] DMTD was: high rev isolation amps
To: "Bob Stewart" <b...@evoria.net>, "Dis
On Thu, 12 May 2016 05:51:50 + (UTC)
Bruce Griffiths wrote:
> The input noise of a 125 series gate will be far larger than the noise at the
> mixer output at the beat frequency. A 125 may be useful as the output stage
> of a Collins style limiter chain wherein
ule should be on its own PCB for isolation. That keeps the
costs down, except for the numerous SMA jumpers - and the eventual big box.
Bob
On Wed, 5/11/16, Bob Camp <kb...@n1k.org> wrote:
Subject: Re: [time-nuts] DMTD was: high rev isolat
costs down, except for the numerous SMA jumpers - and the eventual big box.
Bob
On Wed, 5/11/16, Bob Camp <kb...@n1k.org> wrote:
Subject: Re: [time-nuts] DMTD was: high rev isolation amps
To: "Bob Stewart" <b...@evoria.net>, &
olation.
That keeps the costs down, except for the numerous SMA
jumpers - and the eventual big box.
Bob
On Wed, 5/11/16, Bob Camp <kb...@n1k.org>
wrote:
Subject: Re:
[time-nuts] DMTD was: high rev isolation amps
To: "Bob S
its own PCB for isolation. That keeps the
costs down, except for the numerous SMA jumpers - and the eventual big box.
Bob
On Wed, 5/11/16, Bob Camp <kb...@n1k.org> wrote:
Subject: Re: [time-nuts] DMTD was: high rev isolation amps
To: "Bob St
e-nuts] DMTD was: high rev isolation amps
To: "Bob Stewart" <b...@evoria.net>, "Discussion of precise time and frequency
measurement" <time-nuts@febo.com>
Date: Wednesday, May 11, 2016, 8:44 PM
Hi
For extra added “Time Nut” grade fun:
Clip the collector lead o
Hi
For extra added “Time Nut” grade fun:
Clip the collector lead off of the SOT-223 packages (between emitter and base
leads). You probably will gain a couple of db of isolation. (running common
base).
Bob
> On May 11, 2016, at 8:24 PM, Bob Stewart wrote:
>
> Hi Bob et al,
, 5/11/16, Bob Camp <kb...@n1k.org> wrote:
Subject: Re: [time-nuts] DMTD was: high rev isolation amps
To: "Bob Stewart" <b...@evoria.net>, "Discussion of precise time and frequency
measurement" <time-nuts@febo.com>
Date: Wednesday, May 11, 2016, 8:44 PM
Hi Bob et al,
I'm finally drawing up a schematic for a DMTD and I thought I'd use the NBS
circuits for a lot of it. So, how about PZT3904 transistors in the isolation
amps? They're in SOT-223 with the heat sink tab.
I figure to use some version of the TUF-1 for the DBMs. The first version
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