[TowerTalk] How to test functionality of bandpass filters?

[Jim Brown]

On 12/21/2013 11:21 PM, W7ZZ wrote:
> I am an officer of a local radio club. We have had a number of 
> monoband bandpass filters donated over the years that we would like to 
> use for Field Day, etc.  The question is:  How do we determine that 
> they work?  Any advice will be appreciated.

The best way is to sweep them with a signal generator connected to one 
port and a voltmeter (or some other calibrated RX) connected to the 
other port.  You can do this with anything from a manual generator to a 
vector network analyzer or spectrum analyzer with tracking generator. 
The vector network analyzer is best -- it can measure the amplitude 
response and the SWR -- but I've gotten good data doing point by point 
measurements with an HP generator and calibrated voltmeter.

73, Jim K9YC