For my own amazement, measured for comparison two diodes, MVAM109 and BB910.
A schematic of the N5IB design?test fixture** is attached. All stabilized at room temperature for measurement.
?????????????? Capacitance, pF
V??????? MVAM 109????? BB910
0????????? 750????????????????? 52
1????????? 481????????????????? 35
2????????? 340????????????????? 27
3????????? 234??????????????? 22
4????????? 152????????????????? 17
5????????? 100????????????????? 13
6????????? 66??????????????????? 9
7???????? 45??????????????????? 7
8???????? 33??????????????????? 6
9???????? 27????????????????????5.9
10?????? 23???????????????? 5.73
11?????? 21?????????????????? 5.59
12?????? 20?????????????????? 5.45
Highest voltage available from the battery.
The capacitance range of the BB910 is similar to the 60 pF section of a polycon often used with HF?VXOs. The MV-209 has a comparable C range.
** N5IB produced a kit of the fixture, since retired.? Fairly easy to build one from?parts on-hand.
--
Chuck, W5USJ (ex K2OFN)
Point, Rains Co, TX? EM22cv
Chuck Carpenter