Rein and All, The only description I have of FNpsk is found at http://www.w1fn.org/fnpsk/index.html
I downloaded the applications and unzipped it and found an FNpsk.CAB file which I unzipped and it had all the help files in it starting from the mainscreen.html. Thus far this is all I know about FNpsk. But I like the functionality. I would be concerned about using QPSK63 and not PSK63 or PSK125 and also their error handling method(s). Here are some quotes from the Help Files on Error Handling... Error Handling Error control objectives PSK is thought of as a way to achieve good communication under very poor signal-to-noise conditions. That is not the major goal for FNpsk. The goal of FNpsk is to achieve error-free transmission under moderate signal-to-noise conditions. This is because FNpsk is used for emergency traffic where even a single error can be important. To achieve this goal FNpsk uses additional error control mechanisms that are not used in typical PSK31 operation. QPSK Quadrature Phase Shift Keying (QPSK) is a transmission technique available in the standard PSK31/63 protocol suite. QPSK is not generally used in normal amateur radio communication, but it does provide a degree of improvement in per-character error performance so it is suggested that QPSK be used when handling emergency messages. The default mode of FNpsk uses the PSK63 QPSK LSB protocol. Framing FNpsk splits messages into frames. If errors occur in a received frame then the errored frame is re-transmitted The process used is as follows: The sending station transmits all frames in sequence to the destination(s). At the end of each frame a checksum is sent so the destination(s) can tell whether the frame is received correctly. After all frames have been sent the sending station polls each receiving station to find out if any frames were received in error and need to be re-transmitted. If the poll response indicates that a frame was received in error then the frame is retransmitted. Maximum frame length Even under good conditions there is a small probability that a received frame will contain errors, and the probability increases as the frame length increases. If a frame is too long then re-transmitting may not help because each re-transmission is also likely to fail. Under these circumstances the only two alternatives are to shorten the frame length or improve the signal-to-noise performance of the channel. FNpsk provides two frame lengths which can be chosen to optimize efficiency and performance. The longer frame length is best suited for high quality paths often found on VHF/UHF networks. The shorter frame length is best suited for noisier HF paths. Caution Error detection and retransmission techniques are provided in FNpsk with the goal of achieving error-free performance, but there can be no guarantee that errors might not be introduced under exceptional conditions. The authors and providers of this program accept no responsibility for consequences resulting from errors or malfunctions of this program or its use. Such consequences are solely the responsibility of the user. It is my understanding with the ARRL ECCOM Group recommending WinLink 2000 that the developer of FNpsk has stopped working on the applications. I do not know if the PSK DLL used was the original one used in PSK63/QPSK63 and if the error handling is as good as K9PS's AQR protocol...I think not. I am wondering how FNpsk would work with PSK125 and Paul's ARQ protocol. Actually if you could have both applications running and using the same sound card at the same time on the same mode, then I would thing that having too separate would be Ok but of course integrating them is better. 73, Walt/K5YFW -------- Original Message -------- Subject: Re: [digitalradio] Re: FNpsk Date: Tue, 30 Jan 2007 10:27:17 +0100 From: Rein Couperus <[EMAIL PROTECTED]> Reply-To: [email protected] Organization: http://freemail.web.de/ To: [email protected] Everybody with an HF trx and a laptop that has a CD drive and a soundcard can set up a server and connect it to the internet, provided the trx has reasonable fequency stability . We are planning to include HF forwarding capability in both client and server. The user interface of the client is Evolution (like Outlook (C)Microsoft Company). You write the messages in a normal mail client, and then press the send button. Can you tell me what FNpsk capability is lacking in pskmail at present? (Just for our long term planning...) 73, Rein EA/PA0R/P > At this time, PSKmail seems like a better approach, but it can only > work on Linux OS so very few hams will have the ability to even try it. > PSKmail can also connect to a server to send e-mail. Unlike the > centrally controlled Winlink 2000 system, any ham can set up a server > from what I can tell. Maybe Rein can fill us in on that. I like the idea > of being able to set something up quickly on an ad hoc basis to fill a > need if emergencies occur. > -- http://pa0r.blogspirit.com Announce your digital presence via our DX Cluster telnet://cluster.dynalias.org Our other groups: http://groups.yahoo.com/group/dxlist/ http://groups.yahoo.com/group/themixwgroup http://groups.yahoo.com/group/contesting http://groups.yahoo.com/group/wnyar http://groups.yahoo.com/group/Omnibus97 Yahoo! Groups Links
