[TenTec] Re: TT vs 756PROII

[Steve Ellington]

Scrap the test equipment. Just listen to yoursef in another receiver as you
switch the Pro between QSK and Semi bk in. If your dits sound shorter in QSK
mode then it's truncating. My IC-706 chops dits to death in QSK mode but
sounds excellent in semi mode. All Icom needed was some compensation in
their internal keyer but they got hung up on this "ratio" thing (whatever
that is). Running this same test on the TS-870 yields identical results
between QSK and Semi bk-in using either it's internal keyer or an external
keyer.
Strangely, Kenwood seems to care more about keying quality the others.
The only Yaesu I know of that doesn't chop dits is the MP. The 990, 1Kd are
both choppers in QSK.

Steve Ellington
N4LQ


----- Original Message -----
From: "George, W5YR" <w5yr@att.net>
To: "Steve Ellington" <n4lq@iglou.com>; <w8lx@arrl.net>
Cc: "Roy Koeppe" <royanjoy@ncn.net>; "Ten Tec Reflector"
<tentec@contesting.com>
Sent: Friday, February 01, 2002 8:56 PM
Subject: Re: [TenTec] Re: TT vs 756PROII


> Don't know about the PRO II, Steve.
>
> But, I am getting confused here - nothing new!   <:}
>
> When I hold down the dit paddle at almost any speed and look at the r-f
> output envelope with a scope, I see almost perfectly equal dot and space
> times. I have tried to catch the first few dots and have on occasion but
> could not see any obvious shortening. I also watch the envelope of the
> keying sidetone which precedes the output by a bit and it shows a constant
> lag behind the r-f output.
>
> I monitor with a little 20 Mhz Gold Star dual-trace scope. I will have to
> fire up the Tek 465B and fiddle with the synch setup until I can
> single-sweep those first few dots and see what is happening.
>
> Now, the QST photo shows considerable shortening and also says that it
> affects only the first two dots in Full Breakin and the first dot only in
> Semi-Breakin.
>
> Yet Rob, W8LX says that every code element in breakin is shortened by the
> same 6 msec, regardless of character rate.
>
> I need to do some lab work for my own satisfaction. If I learn anything
> interesting, I'll pass it on. But as a practical matter as I posted
before,
> I notice zero problems with Full Break-In operation and I have never
> received any report of light dots or shortened initial code elements.
>
> 72/73/oo, George W5YR - the Yellow Rose of Texas
> Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
> Amateur Radio W5YR, in the 56th year and it just keeps getting better!
> QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771
> Icom IC-756PRO #02121  Kachina #91900556  IC-765 #02437
>
> All outgoing email virus-checked by Norton Anti-Virus 2002
>
>
> Steve Ellington wrote:
> >
> > Well that contradicts the QST review on the Pro2. Something isn't right.
Did
> > Icom change the keyer in the Pro2 to have a real weight control or is it
> > still the odd "ratio" type control.
> > Steve Ellington
> > N4LQ
>
>