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Rene brought a high power RF dummy load made by an amateur friend to professional standards. We could compare the degree of professionalism to the images seen at the presentation of the Hubble Telescope the previous night. Thanks to Don K6GHA and members of the SLVARC for arranging that event. We discussed using modern high power ceramic resistors instead of the carbon types Hams have used for decades. Rene also showed us a rare random noise voltmeter made by Bruel & Kjoer.<\/p>\n
The discussion on resistors meshed well with Ron’s current activities. You may recall he has an objective of measuring ESR of capacitors using a N2PK VNA. To be brief, VNA accuracy is dictated in large measure by the precision of calibration components. A 49.9 Ohm 1% leaded resistor is unsuited to accurately measuring the milliOhms of capacitor ESR. If (like Ron) you think of resistors in terms of color coded bands its time to review the current state of the art ! A great place to start is by downloading the eBook \u201cThe Ultimate Guide to Resistors\u201d from the Riedon web site. Ron is waiting on a 50 Ohm +\/- 0.01 % SMD component and a careful layout of a test fixture with gold plated connectors is in progress. To determine the accuracy being achieved also requires some reference components with accurate values down to a few tens of milliOhms There is an amazing selection of them on Mouser or Digikey. Stay tuned if interested.<\/p>\n
Peter you will recall is also interested in resistors from a perspective of noise and distortion at audio frequencies. The Riedon guide shows that noise associated with alternative resistor technologies can differ by as much as 30 dB. In the context of noise, Glen mentioned how misleading it is to refer to recovering signals below noise without reverence to Shannon’s Law (note the word \u201cLaw\u201d not theory). Eric gave some hints about improving inter-network latency, pity IP V6 didn’t survive.<\/p>\n
Finally our CAKE sessions probably began about 18 years ago, and it seems time to celebrate. It would be appropriate to hold a party in Watsonville at a time Eric WA6HHQ (co-originator of the CAKE idea). will be able to join us. Let’s see if we can make this happen.<\/p>\n
Our next session will be on Nov 10 I will determine if the Abbey will be available so please assume so unless you hear to the contrary.<\/p>\n
73 Ron<\/p>\n
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CAKE Session Oct 27 2018 We recoved quickly from the shock of finding the Abbey closed by following Cap’s suggestion to move to Coffee Junction- it worked out fairly well but the table was not large enough for all and …<\/p>\n