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w2tgr
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« on: March 02, 2019, 11:39:18 AM »

Could someone tell me the difference in the  Optimod FM vs AM.. I am wondering if the FM model could be used on AM
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K8DI
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« Reply #1 on: March 02, 2019, 04:00:27 PM »

Short version:  FM includes the stereo encoder, has a pre-emphasis network. AM does not. Unless it's rather old, AM probably has NRSC filtering. FM does not.  Multiband compression bands are different due to the bandwidth of broadcast FM vs AM (no need to compress/limit 6-15kHz on an AM if you're just going to filter it off).

Can you use it? Sure. You need to disable the 75uS preemphasis, turn off the stereo, and add your own LPF/NRSC type filter on the output.

Ed
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Ed, K8DI (fmr. KB8TWH)
K1JJ
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"Let's go sailing, Tommy!" - Yaz


« Reply #2 on: March 02, 2019, 06:06:20 PM »

"Ed, K8DI (fmr. KB8TWH) "

Boy, did you get rid of a giant gorilla on your back...  congrats, Ed  -    Grin

Tom, K1JJ
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Frank / WA1GFZ says when he's working near high voltage, as a warning he sings this song by Jay and the Americans: "Come a little bit closer, you're my kind of man, so big and so strong, come a little bit closer, I'm all alone and the night is so long."
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