Yeah;
But sometimes there is some magic in the design
of the LPF.
Greg
On 3/21/2011 5:51 PM, John Miles wrote:
I liked this part:
"Initially, the intent was to use the MSBOUT (Most Significant Bit) output
pin as the LO source. This would have been great since the output is
TTL-leveled, exactly what the SLM phase detector is designed to work with.
Unfortunately, this MSBOUT signal is not a clean square wave. There is some
rollover in the DDS engine happening every few milliseconds, stretching the
pulse repeatedly. This caused some modulated noise on the audio. Rejected."
... because I made the same mistake the first time I used an early
commercial DDS part that required an outboard DAC. ("Why would I need a $50
DAC chip? Those guys at Qualcomm must be morons. I'll just hang a low-pass
filter off the MSB...")
-- john, KE5FX
-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of [email protected]
Sent: Monday, March 21, 2011 11:32 AM
To: Time-Nuts
Subject: Re: [time-nuts] HP 3586A/B/C entirely referenced to 10MHz:
Asolution
Hi Bert,
That is very interesting, thank you for sharing.
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-----Original Message-----
From: "Bert, VE2ZAZ"<[email protected]>
Sender: [email protected]
Date: Mon, 21 Mar 2011 10:11:04
To:<[email protected]>
Reply-To: Discussion of precise time and frequency measurement
<[email protected]>
Subject: Re: [time-nuts] HP 3586A/B/C entirely referenced to 10MHz: A
solution
Hello Everyone,
I have spent the last few weeks modifying the HP 3586 Selective
Level Meter. The
intent was to modify the unit and reference the SSB product
detector stage to
the internal reference. This would make the entire SLM locked to
the 10MHz
reference, whether internal or externally fed.
I have completed the modification with satisfactory results. I
use a DDS-Based
Function Generator 16-pin IC and a small 8-pin PIC micro. For
more detail,
visit my website at http://ve2zaz.net/HP3586_AD5962/HP3586_AD5962.htm .
This has been a very good exercise from a DDS perspective and I
have learned a
lot on the topic. I would be interested in hearing from those who
proceed with
the mod.
Thanks,
Bert, VE2ZAZ
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