[Icom] Re: IC-756 rise time measurements

[John Seney]

Hi Bill:

Glad you enjoyed the data - thanks for your comments.

I'm not familiar with the Omni 6+ although I ran an Omni V for
a 6 month period recently and thought it was a great little radio.

For my testing, I used the built-in keyer in the 756. I report that
the rise time doubles on the second character sent in rapid succession.
Lengthening the turn on envelope, from a key click perspective, only goes
to reduce the effect.

Having a keyer that lets you take absolute control of the proportionality
of each character is cool. I'll take some data to see how proportional
the 756 is and see if I need one of those CMOS Super Keyer III units.


          72/73
John Seney, WD1V [FN42]
QRP ARCI 10345 K2 #1388
FIST #5014     CC: 1151
http://www.qsl.net/wd1v



>John,
>I enjoyed reading your QRP-L posting regarding the 756 proII keying 
>characteristics. I've never had anyone tell me I had clicks but I 
>have had CW friends tell me the keying is not smooth like my Ten Tec 
>OMNI 6+.
>
>I was wondering if you made measurements like the ARRL does in their 
>product reviews showing the shortening of dits as you change the 
>rise time? It seems to me that as you increase the rise time the dit 
>shortening gets proportionately worse. I use a CMOS Super Keyer III 
>that allows me to independently add length to the dots and dashes to 
>compensate for the foreshortening. Based on the ARRL data I'm adding 
>5 ms to the dots, nothing to the dashes. If I were to reset my 
>risetime I imagine I'll need to add a bit more compensation.
>
>73,
>Bill Shanney, W6QR