Hi Luca, look here: http://www.clmt.de/service-manuals/ 73 KJ6UHN Alex On 1/30/2016 12:49 PM, Luca Dal Passo wrote:
Hi All, while i was looking for an hp k34-59991A phase comparator on ebay in order to make some long term measurements of frequency drift of a dut against a reference (by logging the analog output of the meter) i found and bought a Bruel & Kjaer type 2971 phase meter instead of the hp. It is a very nice unit, with digital and analog readout, high resolution and high precision. The drawback is that it is a very low frequency device, specified for the range 2Hz to 200 kHz. So, to compare two 5 or 10 MHz signals i'm thinking to use two simple double balanced mixer, some low pass filtering on the IF outs of the mixers, and a common local oscillator of about 5,1 MHz or 10,1 MHz to convert signals into the range of the instrument. The actual frequency of the local oscillator does not metter, because it is the same for the two input signal, and theoretically i could use even a simple free oscillator, provided only the frequency falls in the correct region regardless of phase noise and stability because their effects are subtracted cancelling themselves. Anyway i think to use a simple ambient temperature xtal oscillator for that. What are your opinions? What i'm forghetting to consider? What kind of drawback i have to expect? The other question is about the availability of user/service manual (or at least schematics) of the Bruel & Kjaer 2971: i'm not able to find anything on the net. Many thanks! Luca IW2LJE _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.----- No virus found in this message. Checked by AVG - www.avg.com Version: 2016.0.7357 / Virus Database: 4522/11519 - Release Date: 01/30/16
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