JFTHOI... (just for the heck of it)...
I logged the Stop Bit Length on a variety of stations I worked the last
few hours of this Markothen contest on 4 bands. If the entry below
includes "jitter", that means the 2Tone reading was not solid, rather
moving +/- several numbers. The majority were pretty stable, after the
decoder locked in on the signal. It would be interesting to know how
these stations generated their signal.
In my case, I am using N1MM Logger with MMTTY generating On/Off keying
with EXTFSK through the parallel port of my Latitude C640 laptop which
is running Win XP sp3. The LPT port keying is the single transistor switch.
I am using 2TONE 13.04a in a second decode window. (I had some issues
with the newest 2Tone version freezing the display so I backed down to
the previous version I have been using. I am not certain yet whether
this is related to 2Tone or some other situation with the contest
computer after recent MS updates to XP.)
73 de Bob - KØRC in MN
FWIW - unscientific as it is, here's the list...
K0RC 34
*10M*
ZL1G 46
*15M*
VE7CC 34
DM5TI 46 jitter
W4UEF 34
IK2DZN 46 jitter
EA8/RW3DO 34
KN5S 34
W7OM 46
CO2GL 34
K7OX 38
WA1GOS 34
K1MK 33
G8ORH 34
AE1T 34
K4GMH 42
AA5AU 34
VA2UP 42
W6SFK 40
K0GEO 44
K1DUQ 34
K6HGF 40 jitter
JG3FEA 46
W6SX 48
VE2EBK 47 jitter
VA7ST 38
KH6GMP 42
N2ESP 34
JA7BME 46
*20M*
K4HAL 34
VE3MGY 34
S53M 38 jitter
5C5W 42
PD2PVM 34
IK2DZN 44 jitter
PD1ALW 34
W4UK 34
DF9ZP 36
9A7C 48
K5LRN 44
W5LKB 34
KJ7GI 34
N7UVH 34
W1UE 46
PR7AR 34
KG4HF 34
*40M*
AA0AW 34
------------------------------------------------------------------------
On 10/12/2013 2:56 PM, Andrew Flowers wrote:
Andreas wrote:
- if I did that right and the routine is accurate -
That's a good point, Andy--we're all assuming that the stop-bit tracking
routine in 2Tone is accurate. You could always put a scope on the logical
output if you really wanted to look at the waveform over time. Then you could
see jitter and anything else.
I am also not sure that 2Tone will copy one stop bit. If it's not printing correctly
then the number being reported is meaningless. It looks like 46ms might be an upper
limit, too....maybe David fails over into an "asynchronous" mode in this
case....I don't know. I do know MMTTY *will* copy one stop bit. Fortunately, almost
nobody sends that on ham bands since frame errors become much harder to recover from.
For those keeping score at home, one bit = 22ms at 45 baud. So 1.5 stop bits
should 33ms, and 2 stop bits should be 44ms.
Andy K0SM/2
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