On Fri, 14 Nov 2003 12:33:36 -0800, Bill Turner
wrote:

On Thu, 13 Nov 2003 23:34:50 -0000, "zindazenda"
wrote:

need to id an inductor..its marked up 220..

i should know this but my minds gone blank...how does the coding go??
obviously first 2 digits are the value and last multiplyer so to speak..so
22 what..nh?uh? etc

ISTR a simple LC oscillator that, when coupled to a frequency counter,
enabled unknown/dubious inductors to be classified when oscillating
with a known Capacitor. Where did I see it?.

"Mike W" wrote in message
...
ISTR a simple LC oscillator that, when coupled to a frequency counter,
enabled unknown/dubious inductors to be classified when oscillating
with a known Capacitor. Where did I see it?.

One thing I've used ... if you simply put the inductor in series with a
resistor, and then put RF across it, you can then measure the voltage drops
across the resistor and the inductor with your RF probe and from there
calculate the inductance ... or capacitance for that matter.

The oscillator idea sounds a little more convenient, once you built up the
oscillator, with a few capacitance choices to get the resonance on the right
planet.

...


...

"Mike W" wrote in message
...
ISTR a simple LC oscillator that, when coupled to a frequency counter,
enabled unknown/dubious inductors to be classified when oscillating
with a known Capacitor. Where did I see it?.

One thing I've used ... if you simply put the inductor in series with a
resistor, and then put RF across it, you can then measure the voltage drops
across the resistor and the inductor with your RF probe and from there
calculate the inductance ... or capacitance for that matter.

The oscillator idea sounds a little more convenient, once you built up the
oscillator, with a few capacitance choices to get the resonance on the right
planet.

...


...

ISTR a simple LC oscillator that, when coupled to a frequency counter,
enabled unknown/dubious inductors to be classified when oscillating
with a known Capacitor. Where did I see it?.
==============
Realising that not every ham has a MFJ 259B or similar analyser , this is a
really useful instrument and well worth considering ,not only for antenna
matching.
The 259B has among its facilities a capacitance and inductance measuring
capability.

When mesasuring inductances and capacitances it is very revealing that the
measured values do change dramatically at higher frequencies ,especially
useful to know when using components in HF and VHF circuits.

BTW I also use an inductance & capacitance meter with LCD readout
,operating with an internal 1000 Hz oscillator , which measures the
inductance / capacitance ,obviously at that frequency and is fine for up to
the lower HF frequencies.

Frank GM0CSZ / KN6WH

ISTR a simple LC oscillator that, when coupled to a frequency counter,
enabled unknown/dubious inductors to be classified when oscillating
with a known Capacitor. Where did I see it?.
==============
Realising that not every ham has a MFJ 259B or similar analyser , this is a
really useful instrument and well worth considering ,not only for antenna
matching.
The 259B has among its facilities a capacitance and inductance measuring
capability.

When mesasuring inductances and capacitances it is very revealing that the
measured values do change dramatically at higher frequencies ,especially
useful to know when using components in HF and VHF circuits.

BTW I also use an inductance & capacitance meter with LCD readout
,operating with an internal 1000 Hz oscillator , which measures the
inductance / capacitance ,obviously at that frequency and is fine for up to
the lower HF frequencies.

Frank GM0CSZ / KN6WH