Not unreasonable Bruce......no free lunches etc. :-))
Alan
G3NYK
----- Original Message -----
From: "Bruce Griffiths" <bruce.griffi...@xtra.co.nz>
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Sent: Friday, November 23, 2012 5:38 PM
Subject: Re: [time-nuts] Best phase detector / mixer for 100MHz?
NIST have shown (at least at 10MHz) that the high level mixers they tested
are noisier than the ZRPD1.
Bruce
Alan Melia wrote:
Hi Anders, isn't this format exactly what is inside the high level mixers
(spec'e +17dBm) from Minicircuits?
Alan
G3NYK
----- Original Message ----- From: "Anders Time" <anderst...@gmail.com>
To: <time-nuts@febo.com>
Sent: Friday, November 23, 2012 3:42 PM
Subject: [time-nuts] Best phase detector / mixer for 100MHz?
I have been using an minicircuits mixer as a phase detector for
measuring
low frequency(5-10MHz) and it is usually good enough. But when I want to
measure 100MHz the sensitivity of the mixer decreases a lot, so when I
want
to measure some really low noise 100MHz(Pascall -178dBc floor with 18dBm
out) oscillators the sensitivity is not good enough. I read in an old
article by Walls, Stein et al(Design considerations in state-of-the-art
signal processing and phase noise measurement system) that one can use
two
diodes in series in the double balanced mixer to increase the
sensitivity.
I tried this with some standard 1n5711 Schottky and the sensitivity is
now
1V/rad, but is there a easier way to do this? /Anders
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