There are some things in a transmitter that just should never be
adjustable. There is an optimum rise time and waveshape for minimizing
clicks. It is what it is, it's the best you can get, and there is no
reason whatsoever to change it.
Nearly a lifetime ago at a college ham station, there was a very large
bright red button on the amplifier rack labeled "Do Not Press." Most
every visitor did and discovered that nothing happened ... until they
let go ... at which point a loud fire bell sounded. It could be
silenced by pressing and holding the button.
Give someone a knob and they will turn it.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
Steve L wrote on 7/1/2023 10:34 AM:
George,
The IC7300 was among the better commercial transceivers in terms of spurious
emissions, clicks, splatter, etc. It wasn’t at the top of the list (the K3s is
however), but was in the “better” category. However, Rob recommended a change
in the CW signal rise time to no less than 6 milliseconds - I forget which menu
item it was - but he criticized Icom specifically for a default setting that
induced key clicks.
Take a look at this presentation - while it is titled “Receiver Performance
What is the Limit Today” he mixes discussion on transmit composite noise with
receiver performance. It was really eye opening for me.
https://www.youtube.com/watch?v=GNh0wP9PlsM
There are others on line as well.
Steve
AA8AF
On Jul 1, 2023, at 12:06 PM, George Thornton <[email protected]>
wrote:
I think this was an Icom 7300 but I am not sure.
-----Original Message-----
From: [email protected] <[email protected]> On
Behalf Of Steve L
Sent: Saturday, July 1, 2023 8:47 AM
To: [email protected]
Subject: Re: [Elecraft] Field Day Operation
I was wondering too about the huge signal in the center of the waterfall….
Hopefully, the ARRL “Clean Signal Initiative” will help encourage manufacturers
to clean up these messy transceivers!
I recently discovered several presentations by Rob Sherwood - famous for his
receiver testing. I was fortunate to get to meet him at Hamvention this year
and thanked him for his work. His new(?) message: CLEAN UP THE DIRTY
TRANSMITTERS. And he calls out specific models! BTW, Elecraft was NOT on the
lists, but it is surprising which ‘high end’ transceivers were. It’s worth
reviewing his presentations on the subject - and it kept me from a bad upgrade!
Steve
AA8AF
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