An accurate measurement of linearity with voice modulation would
seemingly best involve a bandwidth measurement using voice modulation.
However, voice modulation would probably not be a valid test of
distortion using 2-tone transmission.
>Correct, that is why they use high level RF two-tone generators for linear
>amplifier linearity test.
>
>73
>Bill wa4lav
>
>
>At 07:54 PM 3/6/2003 -0500, Gary Schafer wrote:
>
>
>>Tom Rauch wrote:
>>>>Probably the simplest and most repeatable way to monitor inter mod is to
>>>>just switch your receiver to the opposite side band. Im products are
>>>>going to fall on the opposite side band as well as on the wanted side
>>>>band. On the opposite side band you don't have the wanted signal
>>>>components to interfere with hearing the IM products.
>>>
>>>IM products are not symmetrically dispersed Gary. Where they are USB or LSB
>>>depends on relative level (and I would guess phase, I need to think about
>>>that) of the original frequencies.
>>>73 Tom
>>>
>>
>>Hi Tom,
>>
>>If IM products are generated at RF (after filters) I don't think that
>>there is a difference. Each signal should modulate the other equally. If
>>some of the products are being generated at lower levels in the
>>transmitter then I could see where there would be some difference. I know
>>that there are phase modulation products associated with an SSB signal but
>>I had never thought of it as having any effect on IM products.
>>
>>73
>>Gary K4FMX
>>
>>
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>
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>
- R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K,
www.vcnet.com/measures.
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