[time-nuts] TADD-1 six channel RF distribution amplifier

[Steve]

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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