Search found 1037 matches

by Sam
Sun Jul 08, 2012 7:48 pm
Forum: Yahoo groups backup
Topic: 10 MHz spur
Replies: 10
Views: 1207

Re: 10 MHz spur

<r>If leakage through Mixer 4 is the problem, the LO3 signal would have to leak through a lot of circuitry (including the cavity filter) to reach Mixer 2, where it would cause the problem. I suspect more direct through-the-air leakage. Try disconnecting PLO3 from Mixer 4 and see if the spur goes awa...
by Sam
Sat Jul 07, 2012 4:51 pm
Forum: Yahoo groups backup
Topic: 10 MHz spur
Replies: 10
Views: 1207

Re: 10 MHz spur

<r>Perhaps the MSA signal generator is set to 10 MHz. If so, change it to 9.9 MHz and see if the spur moves.<br/> <br/> Sam W.<br/> <br/> <br/> <br/> --- In [url=mailto:<EMAIL email="spectrumanalyzer@yahoogroups.com">spectrumanalyzer@yahoogroups.com</EMAIL> t=_blank]<EMAIL email="spectrumanalyzer@ya...
by Sam
Tue Jul 03, 2012 12:56 pm
Forum: Yahoo groups backup
Topic: Version 116-4s
Replies: 0
Views: 1425

Version 116-4s

<t>I have replaced the MSA software in the Files section with the latest version, MSA_Version116-4s.zip. Most significantly, this allows the "LPT" test routine to function with USB. It also allows Auto Band switching and Color Cycling, as described in the ReadMe file. Also a few bug fixes.<br/> <br/...
by Sam
Wed Jun 27, 2012 12:40 am
Forum: Yahoo groups backup
Topic: HSUSB
Replies: 14
Views: 1542

Re: HSUSB

<r>I have not implemented USB for my MSA, so I am guessing here. I believe the setup/driver files are common to the N2PK and MSA, except there are some data files included that customize the communication for each device. The setup procedure is entirely independent of the MSA software, which acts th...
by Sam
Tue Jun 26, 2012 2:41 pm
Forum: Yahoo groups backup
Topic: HSUSB
Replies: 14
Views: 1542

Re: HSUSB

<r>When the MSA is configured to use Dave's USB driver, the commands are coded so the Cypress knows which of its ports is the destination for each command. The FTDI would not be able to decode the messages.<br/> <br/> Sam W.<br/> <br/> <br/> <br/> --- In [url=mailto:<EMAIL email="spectrumanalyzer@ya...
by Sam
Tue Jun 26, 2012 12:13 am
Forum: Yahoo groups backup
Topic: Coax source
Replies: 0
Views: 1387

Coax source

<t>When I was experimenting with baluns and bridges, I used some 0.047" and 0.056" coax. Some people asked me where I got it, but by that time I could not remember. Just ran across the source--manufactured by Micro-Coax, distributed by amawave.com. Not cheap, but not horribly expensive, and availabl...
by Sam
Thu Jun 21, 2012 11:08 am
Forum: Yahoo groups backup
Topic: DDS frequency
Replies: 13
Views: 1360

Re: DDS frequency

<r>Jim,<br/> <br/> If your cabling setup makes it easy to do, try swapping the digital connections for DDS1 and DDS3 and see what happens to the levels of their data lines.<br/> <br/> Sam W.<br/> <br/> <br/> <br/> --- In [url=mailto:<EMAIL email="spectrumanalyzer@yahoogroups.com">spectrumanalyzer@ya...
by Sam
Wed Jun 20, 2012 8:06 pm
Forum: Yahoo groups backup
Topic: HSUSB
Replies: 14
Views: 1542

Re: HSUSB

<r>The "LPT port" test routine was not adapted to USB until version 116-4r. If you need just the .bas file I can email it to you; otherwise I'll have to put together the package of files to update the beta posting.<br/> <br/> Sam W. <br/> <br/> <br/> <br/> --- In [url=mailto:<EMAIL email="spectruman...
by Sam
Sun Jun 17, 2012 9:02 pm
Forum: Yahoo groups backup
Topic: DDS board IC: Can I use AD9851 to replace AD9850?
Replies: 1
Views: 386

Re: DDS board IC: Can I use AD9851 to replace AD9850?

<r>Yes. AD9851 is what I used.<br/> <br/> Sam W.<br/> <br/> <br/> <br/> --- In [url=mailto:<EMAIL email="spectrumanalyzer@yahoogroups.com">spectrumanalyzer@yahoogroups.com</EMAIL> t=_blank]<EMAIL email="spectrumanalyzer@yahoogroups.com">spectrumanalyzer@yahoogroups.com</EMAIL>[/url], "inlinebeginner...
by Sam
Sun Jun 17, 2012 12:02 pm
Forum: Yahoo groups backup
Topic: DDS frequency
Replies: 13
Views: 1360

Re: DDS frequency

<r>Might also be a problem with DDS1 C23, the 100 pF cap on the data line.<br/> <br/> Sam W.<br/> <br/> <br/> <br/> --- In [url=mailto:<EMAIL email="spectrumanalyzer@yahoogroups.com">spectrumanalyzer@yahoogroups.com</EMAIL> t=_blank]<EMAIL email="spectrumanalyzer@yahoogroups.com">spectrumanalyzer@ya...