[time-nuts] DMTD Mixer Terminations

[Bruce Griffiths]

Perhaps they changed the diodes used in MPD/RPD phase detectors over the 
years.

Minicircuits also make a ZP10514  which may use monolithic quad diodes.
These may be noisier at 100Hz offset than the genuine HP10514.

Bruce

Bob Camp wrote:
> Hi
>
> I checked a few newer RPD-1's (actually MPD-1's, but I believe they are the same thing). The two ones I have here from who knows where have about 20% more output (2.4 V p-p) than a typical unit (2.0 V p-p).
>
> Bob
>
>
> On Mar 3, 2010, at 10:56 PM, Bruce Griffiths wrote:
>
>    
>> Whilst your corrected measurements for the 10534 and 10514 are now within about 10% of those found by NIST for one of their mixers, the discrepancy with Minicircuits estimates for the RPD-1s is somewhat larger but their phase detector gain specs seem incompatible with their max output specs.
>>
>> The noise of their phase detector output preamp is surprisingly high (maybe this is relatively unimportant as they use the cross power spectrum technique to measure phase noise?? ), even my crude single NJFET input stage preamplifier breadboard is about 3dB quieter.
>>
>> Bruce
>>
>> Bob Camp wrote:
>>      
>>> Hi
>>>
>>> There was a factor of two "oops" in the math. All the numbers are 2X reality.
>>>
>>> Bob
>>>
>>>
>>> On Feb 28, 2010, at 10:58 PM, Bruce Griffiths wrote:
>>>
>>>
>>>        
>>
>>
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