SV: [AMPS] 2 tone intermod test

[sm5ki]

Hej! One simple test is to use a FM broadcast receiver tuned outside the BC
band and place your microphone in front of the loudspeaker. You modulate
your rig with noise and after having switched sideband you can listen to the
unwanted sideband with a transceiver tuned some kHz away from the carrier to
minimize the effect of the flank selectivity in the tx and rx. Prosit de
Hans SM5KI
----------
>Från: measures <measures@vcnet.com>
>Till: "Dave D'Epagnier" <DAVED@ctilidar.com>, "'amps@contesting.com'"
<amps@contesting.com>
>Ämne: RE: [AMPS] 2 tone intermod test
>Datum: tis 23 nov 1999 23.28
>

>
>>
>>Rich, why should the receiver only be tuned to a 3.7khz offset? 
>
>Because you want to be able to see the 3rd order, 5th order products and 
>very little of the fundamental.  .  If the offset is more you will not 
>see what you are looking for.  .  
>
>>What about
>>the rest of the band? Also, what is generally accepted as an adequate signal
>>to splatter ratio? 
>>
>minus 32db is ok.  TS-830Ss typically do around minus 38db.  
>
>>........ I guess I can run a
>>test with voice but it just seems so subjective and would be hard to show
>>the results to anyone at the Icom factory in case I decide to send the
>>exciter in for a tune up.
>>
>IMD products are pretty much fixed if the RF output unit has the 
>specified idling current.  
>>
>cheers, Dave
>
>-  Rich..., 805.386.3734, www.vcnet.com/measures.  
>
>
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