On Wed, 21 Jul 2004 21:59:41 +0200, J M Noeding
wrote:

On Wed, 21 Jul 2004 12:52:22 -0700, Jim Thompson
wrote:

On Wed, 21 Jul 2004 21:48:28 +0200, J M Noeding
wrote:

Hi
It seems to be some problem to build equipment to measure over
+35...40dBm IP3, and xtal filters seem to cause intermodulation
problem with this level

What I am after is constructions to build which works to measure
higher IP3. Would also be interested to see IP3 measurements for xtal
filters

73, Jan-Martin
---
J. M. Noeding, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/c.htm

Padded-down spectrum analyser ??

36 to 63V P-P into 50 ohms ain't easy ;-)

...Jim Thompson
it is sort of calculation to find the IP3, you could measure 1dB
compression or just the IM

jm

---
J. M. Noeding, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/c.htm

True. Most systems will extrapolate out to IP3 pretty well, so take a
series of data points at lower power levels.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

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