Right. I was once trying to raise a DX op, when he said something like
- "negative copy OM, your audio has too much bass". I adjusted to ~260
Hz Tx rolloff and ~2400 Hz bandpass, and raised him with no problems.
No doubt my wide settings had better fidelity, but they weren't
appropriate for this QSO.
In the telephone business, there are standard ways to measure
intelligibility over a channel. Basically, you speak some standard
words and the listener tries to discern what you are saying. It would
be helpful to have an objective test for SP & audio equalization
settings on an HF channel. (With QRM, fading and an obscure accent, of
course!)
73 Martin AA6E
Ron Castro wrote:
> Different sounds for different purposes. I have found that even subtle
> changes in a pile-up can make you stand out enough to be heard. One more
> click on the SP, a little better shape on the EQ, pointing the beam a few
> more degrees, making sure the amp is tuned...it all adds up! For rag-chew
> with good signals like we usually get on 75 meters at night, then fidelity
> is the name of the game.
>
> That is what is so nice about the current crop of equipment available at
> reasonable prices...you can change from one extreme to another with just a
> few adjustments. Things have come a long way since the days of my old
> SB-100!
>
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