Fwd: Re: [Amps] Why hasn't solid state replaced tubes?

Bill Fuqua wlfuqu00 at uky.edu
Thu Mar 6 20:55:52 EST 2003




>Just did the math again and the products on either side of the two tones 
>must be equal!!!!
>Minor refresher in algebra and trig.
>
>73
>Bill wa4lav
>
>PS take a look at all these examples done with high level two tone RF 
>generators if you don't want to do
>the math.
>
>http://images.rfdesign.com/files/4/0601Barkley36.pdf
>http://e-www.motorola.com/brdata/PDFDB/docs/EB38.pdf
>http://www.angelfire.com/darkside/rfbox/testdata/test.html
>http://www.semiconductors.philips.com/acrobat/applicationnotes/98026.pdf
>
>
>At 07:54 PM 3/6/2003 -0500, you 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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