X-Git-Url: http://dxcluster.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=cmd%2FCommands_en.hlp;h=015bc790118bb77f0342c10dee9fcd055949b62d;hb=bd14b9e29dbd64a441cc7b65f6b6b92717f8a01b;hp=30a1f602f0163d7c3540c80e008a92b01a88fcf4;hpb=16b9415f38bf1b7eab1a9d2dc72abce9a643be09;p=spider.git diff --git a/cmd/Commands_en.hlp b/cmd/Commands_en.hlp index 30a1f602..015bc790 100644 --- a/cmd/Commands_en.hlp +++ b/cmd/Commands_en.hlp @@ -260,15 +260,16 @@ message either sent by or sent to your callsign. === 5^READ-^ As a sysop you may read any message on the system -=== 0^REPLY^Reply to the last message that you have read -=== 0^REPLY ^Reply to the specified message -=== 0^REPLY PRIVATE ^Reply privately to the specified message +=== 0^REPLY^Reply (privately) to the last message that you have read +=== 0^REPLY ^Reply (privately) to the specified message +=== 0^REPLY B ^Reply as a Bulletin to the specified message +=== 0^REPLY NOPrivate ^Reply as a Bulletin to the specified message === 0^REPLY RR ^Reply to the specified message with read receipt You can reply to a message and the subject will automatically have "Re:" inserted in front of it, if it isn't already present. You can also use all the extra qualifiers such as RR, PRIVATE, -NOPRIVATE that you can use with the SEND command (see SEND +NOPRIVATE, B that you can use with the SEND command (see SEND for further details) === 0^SEND [ ...]^Send a message to one or more callsigns @@ -467,6 +468,65 @@ string to see a selection of files in a filearea eg:- See also TYPE - to see the contents of a file. +=== 0^SHOW/MUF []^Show the likely propagation to a prefix +This command allow you to estimate the likelihood of you contacting +a station with the prefix you have specified. The output assumes a modest +power of 20dBW and receiver sensitivity of -123dBm (about 0.15muV/10dB SINAD) + +The result predicts the most likely operating frequencies and signal +levels for high frequency (shortwave) radio propagation paths on +specified days of the year and hours of the day. It is most useful for +paths between 250 km and 6000 km, but can be used with reduced accuracy +for paths shorter or longer than this. + +The command uses a routine MINIMUF 3.5 developed by the U.S. Navy and +used to predict the MUF given the predicted flux, day of the year, +hour of the day and geographic coordinates of the transmitter and +receiver. This routine is reasonably accurate for the purposes here, +with a claimed RMS error of 3.8 MHz, but much smaller and less complex +than the programs used by major shortwave broadcasting organizations, +such as the Voice of America. + +The command will display some header information detailing its +assumptions, together with the locations, latitude and longitudes and +bearings. It will then show UTC (UT), local time at the other end +(LT), calculate the MUFs, Sun zenith angle at the midpoint of the path +(Zen) and the likely signal strengths. Then for each frequency for which +the system thinks there is a likelihood of a circuit it prints a value. + +The value is currently a likely S meter reading based on the conventional +6dB / S point scale. If the value has a '+' appended it means that it is +1/2 an S point stronger. If the value is preceeded by an 'm' it means that +there is likely to be much fading and by an 's' that the signal is likely +to be noisy. + +By default SHOW/MUF will show the next two hours worth of data. You +can specify anything up to 24 hours worth of data by appending the no of +hours required after the prefix. For example:- + + SH/MUF W + +produces: + + RxSens: -123 dBM SFI: 159 R: 193 Month: 10 Day: 21 + Power : 20 dBW Distance: 6283 km Delay: 22.4 ms + Location Lat / Long Azim + East Dereham, Norfolk 52 41 N 0 57 E 47 + United-States-W 43 0 N 87 54 W 299 + UT LT MUF Zen 1.8 3.5 7.0 10.1 14.0 18.1 21.0 24.9 28.0 50.0 + 18 23 11.5 -35 mS0+ mS2 S3 + 19 0 11.2 -41 mS0+ mS2 S3 + +indicating that you will have weak, fading circuits on top band and +80m but usable signals on 40m (about S3). + +inputing:- + + SH/MUF W 24 + +will get you the above display, but with the next 24 hours worth of +propagation data. + === 0^SHOW/PREFIX ^Interrogate the prefix database This command takes the (which can be a full or partial callsign or a prefix), looks up which internal country number