Bill and all,
One reason for "noisy PTT switches" is that the microphone is wired for
VOX operation - which means that the mic element is always 'live'. If
the PTT switch closes before the PTT button travel is complete, you will
hear a 'pop' as the PTT button contacts the microphone case. In other
words, I do not think the switch itself is the problem.
If you examine the Shure PA mic specs that was mentioned, you will find
that the microphone element is normally open - in other words, you have
to depress the PTT button to activate the microphone element. Depending
on the relative contact times of the PTT switch and the mic circuit
(both on the same switch), if the mic element switch is activated after
the PTT is closed, no 'PTT noise' will be present.
Many ham mics are wired so the mic element is always 'closed' which
allows the microphone to be used for VOX without pressing the PTT
switch. That arrangement can cause noise as the PTT switch is depressed
since the PTT button parts are still rubbing on the mic housing after
the PTT switch has closed.
73,
Don W3FPR
On 4/9/2015 10:39 AM, bill wrote:
SHURE 514B
http://cdn.shure.com/user_guide/upload/423/us_pro_514b_ug.pdf0.pdf
the switch will outlast anyone .... human or otherwise,
the ptt assembly is not noisy ..
my kewood mobile hand mic squeaks as the button is pressed,$@!%$^*
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