[Amps] Checking for IMD

[Gary Schafer]

> -----Original Message-----
> From: Bill Fuqua [mailto:wlfuqu00 at uky.edu]
> Sent: Tuesday, August 15, 2006 8:54 AM
> To: Michael Tope; garyschafer at comcast.net; 'Joe Subich, W4TV';
> amps at contesting.com
> Subject: Re: [Amps] Checking for IMD
> 
>          Now we are back to my first suggestion.  Use a good mixer and
> local oscillator to feed a sound card. If you don't need more than 20kHz
> bandwidth you don't need the quadrature oscillator and mixers which could
> extend it to 40kHz if the sideband rejection is sufficient to see the
> lower
> level IM products that you may be looking for.
>           Also, since you will most likely be making measurements using a
> variable frequency TX you could use a crystal controlled oscillator at 4x
> the operating frequency and some D-type flipflops to generate the I and Q
> oscillator signals.
> 
> 73
> Bill wa4lav

Hi Bill,

I assume that you are talking about using a quadrature mixer to get rid of
one side band? Seems like it should work.

73
Gary  K4FMX