[time-nuts] TADD-1 six channel RF distribution amplifier
Steve
steve65 at suddenlink.net
Fri Mar 28 23:56:40 UTC 2008
Bruce and others,
Thank you for the assistance. Seems that the TADD-1 will meet my needs,
I will probably acquire one in the near future.
Steve K8JQ
Bruce Griffiths wrote:
> Steve wrote:
>
>> Thanks for the info Bruce.
>>
>> I'm planning to use the Trimble Thunderbolt as the 10MHz source.
>>
>> The phase noise characteristics of that device are on the Trimble web
>> site. I'm not versed enough in the specifications to call it good, bad
>> or mediocre with respect to phase noise. Thoughts?
>>
>> Thanks.
>>
>> Steve K8JQ
>>
>>
>>
> Steve
>
> If one compares TvB's plot of the phase noise of a Thunderbolt with John
> Ackermann's plot of the phase noise of a TADD-1 at 10MHz.
> Then the phase noise floor of this particular Thunderbolt is lower than
> the phase noise floor of the TADD-1 at the particular gain used in
> John's test.
> Thus using the TADD-1 at this gain will degrade the noise floor of that
> particular Thunderbolt by about 7dB.
> However at 1Hz and 10Hz the phase noise of the Thunderbolt exceeds that
> of the TADD-1 by 15dB or more so the phase noise of that Thunderbolt
> will not be significantly degraded by the TADD-1 at those offset
> frequencies.
>
> Distribution amplifiers with lower noise floors and equivalent or better
> reverse isolation do exist but tend to be expensive.
> A design employing cascaded common base stages can have a significantly
> lower phase noise floor.
>
> Bruce
>
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