Turning off the squelch is key to finding noise with FM. I have found it
is not blanket white noise, it can be only on certain frequencies. What
you need to do is test every channel, not just 16. Yes it is a PITA.
Joe
Coquina
On 2/10/2020 8:23 PM, Bruce Whitmore via CnC-List wrote:
Hi Jeff,
I read your post below with interest, and just to test my stern light
(in which I use an Amazon LED bulb) I took my handheld, turned it to
16, and literally held the antenna up to the lens with the light on.
No change in the static was noticed, nor when I had the squelch set
just right did it trigger any noise.
You mention that "you might never hear it". Is there any way to truly
test for this besides what I did?
Thanks for the insights,
Bruce Whitmore
(847) 404-5092 (mobile)
bwhitm...@sbcglobal.net
On Thursday, February 6, 2020, 9:17:35 AM EST, Della Barba, Joe via
CnC-List <cnc-list@cnc-list.com> wrote:
Some LEDs produce large amounts of RFI well into the VHF
spectrum. Interference at HF frequencies is certainly an
issue, but most of us aren’t on the SSB all day and the noise
is pretty obvious in SSB or AM modes. I can turn lights on and
off until it goes away.
Noise up into VHF is far more insidious. You might never hear
it, but it can severely de-sense FM reception anyway. AIS is
tricky, no one listens to AIS, so you will just wonder why you
have no targets that are not 1 mile or less distant. LED
anchor lights or masthead running lights can be the worst of
all, they are right next to the VHF antenna.
Joe
Coquina
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Thanks everyone for supporting this list with your contributions. Each and
every one is greatly appreciated. If you want to support the list - use PayPal
to send contribution -- https://www.paypal.me/stumurray
