Yup, I have a notch at the old sweep frequency as well... :)
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources
On 3/14/21 4:13 PM, Brian D wrote:
Iworked for years on 405 line TV transmitters. I had a notch of at least
40dB at 10.125khz. I was surprised how quickly it disappeared when 405 line
TV closed down, to be replaced by a rolloff at 16kHz.
I now roll off much lower, and keep moving my default cw sidetone as it
seems to produce a notch after a few contests, I'm currently at 650Hz but
will try 700 again soon.
Dave Cole <[email protected]> wrote:
One of the most common forms of hearing loss starts at the high
frequencies and works its way down with age, but that's far from
universal. When one or more notches develop at certain frequencies, it's
often the result of noise exposure at work.
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