On 4/25/2017 8:37 AM, Jim Thomson wrote:
## baffles me how SS marine xcvrs all have superb IMD..and also run
on 11-15 vdc. Are they using loads of NFB ?
Yes. Along with little to no compression and making sure that the IF
stages aren't over driven. The ALC/IF circuits of amateur transceivers
are responsible for a good deal of the IMD simply because of excessive
gain along the chain. The PA must be over driven in order to produce
any ALC!
73,
... Joe, W4TV
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