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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