Gentlemen, The problem of "walking" up or down the band due to TX/RX offsets was clearly identified by Peter, G3PLX, when he introduced PSK31 and his original...
2475
Samuel Hunt
SamuelHunt@...
Mar 1, 2001 6:27 pm
This is an interesting problem. From what I can see, it shouldn't be too difficult to implement. One method I suggest:- When the frequency is set, store in two...
2476
Samuel Hunt
SamuelHunt@...
Mar 1, 2001 6:27 pm
I'm always very interested in this sort of thing. I would be interested, (If I can find data) to create a digital info service, which says band conditions, and...
2477
Charles Greene
cgreene@...
Mar 1, 2001 6:41 pm
... Thank you John, That's what I always do with the K2 just before I switch to a narrow filter which is when the offset occurs. However, ideally, the...
2478
nb6z@...
Mar 1, 2001 7:34 pm
There is a Beacon Service that provides us with the ability to detect world wide band conditions in real time. Look at http://www.ncdxf.org/beacon.htm for...
2479
Robert D. Hancock, Jr.
sportsof@...
Mar 2, 2001 2:10 am
I feel Bob Lewis has been watching my signal! I have one of the transceivers that have an offset. (Never realized before) Each transmission over, the frequency...
2480
John Hirth
w2ki@...
Mar 2, 2001 2:31 am
Chas, and group: Which station should leave NET off? That's a good question. There is no formal "convention", but in the first days of PSK31 many of us used...
2481
Charles Greene
cgreene@...
Mar 2, 2001 3:11 am
... I am a late comer I guess because I didn't get on PSK31 until the May 99, and I never heard any convention. If that's a good one, then it should be...
2482
Bob Lewis
rlewis@...
Mar 2, 2001 3:20 am
The proper use of NET is especially important for round tables and nets. Without it everybody can end up on a different frequency. It's use is opposite of what...
2483
Dale Coleman
kf4sir@...
Mar 2, 2001 10:59 am
... Ok, this is the starting gun I was waiting for. Yes you are correct that it would be IMPOSSIBLE without Redundancy but I believe it would be possible to do...
2484
Gilbert Baron Yahoo
gbaronmn@...
Mar 2, 2001 12:26 pm
Dale;
What you are talking about has already been done. It is originated by I
THINK IBM and it is called SDLC.
They send that way and each block is numbered...
2485
Bob Lewis
rlewis@...
Mar 2, 2001 12:58 pm
Dale, here's another way to think about the benefits of ARQ vs. FEC. When you detect an error you have to send redundant information somewhere in order to...
2486
Bob Lewis
rlewis@...
Mar 2, 2001 1:01 pm
... request ... But it's still a type of ARQ in that the receiving station must request a retransmission of the errored blocks....
2487
Jim FitzSimons
cherry@...
Mar 2, 2001 1:09 pm
Dale, there are no error free transmissions, just reduced error rate. A good example is when the signal is too weak for even one packet to be sent with a valid...
2488
Charles Greene
cgreene@...
Mar 2, 2001 1:44 pm
Hi, I am finishing up a PSK20 and I am making up cables using RG-174 and an 1/8" stereo phone plug on both ends. I bought 1/8" stereo to 1/8" stereo from...
2489
rlewis
rlewis@...
Mar 2, 2001 6:36 pm
... That's true but CRC has around a 99.9% chance of detecting an error. Of course if you can't get any packets through then you loose the link. While some of...
2490
rlewis
rlewis@...
Mar 2, 2001 8:55 pm
Charles, I used stock (unmodified) stereo cables with molded plugs from Radio Shack with my PSK20. The ring connections are correct for most sound cards. I...
2491
Charles Greene
cgreene@...
Mar 2, 2001 9:26 pm
... Tnx Bob, That's the information I was looking for. Maybe if I change the input from my Omni-VI or K2 to the ring instead of the tip, I'll get rid of the ...
2492
Bob Lewis
rlewis@...
Mar 2, 2001 10:01 pm
... I get about 2.5 watts output. I didn't make any modifications but I did change the final transistor to the 2SC2078 which I believe is now shipped with the...
2493
Charles Greene
cgreene@...
Mar 2, 2001 10:45 pm
... Mine has the 2SC2078, so we will have to see. I think I have a mod that Nick made; I'll have to look. TNX, 73, Chas, W1CG...
2494
Jim
kj5tf@...
Mar 3, 2001 4:18 am
Now that I have Zak on my new computer, Ive noticed a problem I never saw before. Sometimes the waterfall turns solid white.... I have one macro "RX" ( ...
2495
Dale Coleman
kf4sir@...
Mar 3, 2001 1:40 pm
Error detected and corrected data for broadcasting. Maybe a manual sample would help explain. ... This is a sample of a manual way fuzzy error detecting ... ...
2496
Jim FitzSimons
cherry@...
Mar 3, 2001 3:42 pm
The CRC has around a 99.9% chance of detecting an error for only one signal strength. As the signal gets weaker, more distorted, or more interference the...
2497
Bob Lewis
rlewis@...
Mar 3, 2001 4:04 pm
"The CRC has around a 99.9% chance of detecting an error for only one signal strength. As the signal gets weaker, more distorted, or more interference the...
2498
Jim
kj5tf@...
Mar 3, 2001 5:55 pm
Bot this is getting crazy. My laptop runs everything fine. But when I install MMTTY, and Zakanaka on this Compaq PC I often get a solid white display in the...
2499
Jim
kj5tf@...
Mar 3, 2001 6:55 pm
Tried TrueTTY and no problem whatsoever. It dosnt have a waterfall, as does Zak and MMTTY, but no problems at all. Not sure if this info sheds any light, or...
2500
Ron Bethin
rjbethin@...
Mar 3, 2001 8:27 pm
... Hello Jim and group, I have similar problems with MMSSTV and the stand alone version of MMTTY problems. Using the MMTTY engine within Zakanaka, everything...
2501
Samuel Hunt
SamuelHunt@...
Mar 3, 2001 9:06 pm
I am not sure if you're all getting CRC mixed up with parity. Parity is a 4 bit code that goes on the end of 8 bits, and indicates if you have a MINOR (1 bit)...
2502
Bob Lewis
rlewis@...
Mar 4, 2001 12:48 am
... I though parity was a single bit added to 7 or 8 bits in order to detect and odd number of errors. Is there another use for the term "parity"?...
2503
Gilbert Baron Yahoo
gbaronmn@...
Mar 4, 2001 2:26 am
You are correct. It is a single bit added to ANY CHOSEN number of bits to
make the SET of bits (usually a byte but not required) to be either even or
odd. It...
