HP 11721A Frequency Doubler Lab Repair

I was looking for a cheap doubler and came across this unit from Korea. It took almost 6 weeks to get here, some sort of customs holdup. This doubler covers an input range of 50-1300 Mhz. My intent with this was to provide an external doubler for my HP8640B. This item was designed by Bob DeVries of HP.


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HP 8640B Signal Generator Lab Repair

HP 8640B Signal Generator Repair

S/N 2835A30360

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I’ve been looking for one of these puppies for awhile. I used one of these in my work in the mid-late 70’s, so I’ve been trying to find something broken but newer to bring back to glory. Considered by many as one of the finest signal generators ever manufactured, the 8640B has been around a long time, and its frequency stability and spectral purity is second to none.

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RALINK 802.1X MacOS Driver

This post contains instructions for installing the RALINK wireless drivers for ALFA external wireless adapter on Mac. Note that the RALINK drivers are necessary on the Mac host when used in place of the native wireless, but NOT required when running the wireless adapter in a Kali linux VM. In that case, the RALINK drivers are provided from the Kali distro.

Please click the link below for installation instructions for the Mac host installation.:

802.1x Instructions on Mac OS X