[time-nuts] was there ever a "conclusion" on distribution amps ?

Bob Camp lists at rtty.us
Wed Feb 23 18:11:16 UTC 2011


Hi

Since it's in the "no longer available" category, it may not be much of a
solution. Not much need to upgrade for most of what you will be running. 

Another question would be weather you local standard is good to 1x10^-11 at
1 second. If it's not, then that might be the place to put your money.  

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Pete Lancashire
Sent: Wednesday, February 23, 2011 1:07 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] was there ever a "conclusion" on distribution amps
?

just to get going until can 'upgrade' to something better. The TAPR
was pretty cheap, but quite well though out like most of their stuff.

-pete

On Wed, Feb 23, 2011 at 10:03 AM, Bob Camp <lists at rtty.us> wrote:
> Hi
>
> That would be the "video amp" alternative. Works fine at some level. I
don't
> have one so I'm only guessing that it's in the 2x10^-11 at 1 second range.
I
> would be very surprised if it's not though.
>
> Is that good enough for the gear you have? I certainly have not seen much
> stuff that would be unhappy with a standard at that level. This being Time
> Nuts, you do have to ask....
>
> One other area that would limit you - if you are trying to multiply
directly
> up to microwave off of the 10 MHz, then that's a special case as well.
>
> Bob
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Pete Lancashire
> Sent: Wednesday, February 23, 2011 12:52 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] was there ever a "conclusion" on distribution
amps
> ?
>
> was thinking along the lines of this (now discontinued)
>
> http://www.tapr.org/kits_tadd-1.html
>
>
>
> On Wed, Feb 23, 2011 at 8:51 AM, Bob Camp <lists at rtty.us> wrote:
>> Hi
>>
>> How good a 10 MHz do you need noise wise?
>>
>> If the stuff is common lab gear, there are a bunch of ways to go. If you
> are
>> driving dual mixer setups then your choices narrow down a bit. Having
> stuff
>> on one bench (and ground) is easier than running cables hundreds of feet.
>>
>> Assuming it's normal lab gear on one bench:
>>
>> Sixteen port power splitters from a junk pile should have about 12 db of
>> loss. Run about 100 mw / 20 dbm into it and you will have plenty of
signal
>> to run normal lab gear. An ACMOS hex (or octal) buffer based amp can give
>> you that sort of power. Having the logic levels also helps get to 1 and 5
>> MHz. Not a lot of isolation, not real low noise, plenty good enough for 1
> to
>> 2x10^-11 at one second.
>>
>> A few alternatives are also pretty easy. Use a single logic to sine amp
> per
>> output and drop the power splitter. Run video amp chips and forget about
> the
>> logic conversion. For better performance, run discrete 2N3904(6) based
> amps
>> for each channel. A lot depends on what you already have lying around.
>>
>> If it's not the garden variety stuff, then indeed you likely will need
>> something a bit more complex. I'd still consider a simple system to drive
>> the easy stuff and only go fancy for the one or two things that really
> need
>> something that's low noise / high isolation / what ever.
>>
>> If you also are trying to do RF work (like HF radio) consider the spray
> from
>> what ever you do. I have seen 10 MHz standard setups that put out massive
>> signals at 30 or 50 MHz. A bit of thought, a solid ground sheet, and some
>> cheap coils / caps can go a long way.
>>
>> Bob
>>
>> -----Original Message-----
>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>> Behalf Of Pete Lancashire
>> Sent: Wednesday, February 23, 2011 11:18 AM
>> To: Discussion of precise time and frequency measurement
>> Subject: [time-nuts] was there ever a "conclusion" on distribution amps ?
>>
>> I will soon have my 11 th piece of equipment that I want to feed 10
>> MHz (and some oldies 5 and 1).
>>
>> What is the current though on making one's own distribution box ?
>>
>> -pete
>>
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