QRP Labs U4B Ultimate4, Руководство по эксплуатации

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<frequency> is the transmission frequency in Hz.
<power> is the transmitter power to be encoded into the WSPR protocol, expressed in dBm.
<callsign> is the callsign to be encoded into the WSPR protocol. It must comply with the rules of
the WSPR protocol. When using the extended WSPR mode (sub mode 4) the callsign can also
have a prefix or suffix, which must comply with the rules of the extended WSPR protocol.
Note that the Maidenhead Locator Square (or subsquare in the case of sub mode 4, extended
WSPR) is automatically taken from the data extracted from the serial data stream of the GPS.
Where Extended WSPR is used (sub mode 4) the system automatically sends the two WSPR
transmissions consecutively, with the appropriate encoding. You do not need to include two
separate statements on different lines of BASIC. The two transmissions are sent automatically.
Example:
WSPR 2 10140200 10 “AB2CD”
Transmits WSPR on 10.1402MHz with power +10dBm and callsign “AB2CD”.
Note that a WSPR transmission command will automatically wait for the appropriate time to start
transmitting, according to the WSPR protocol; WSPR transmissions for standard 2 minute WSPR,
for example, always commence on the 2
nd second of even minutes.
TELE statement
A special case transmission statement which transmits WSPR and Telemetry using the QRP Labs
telemetry-over-WSPR protocol messages. This consists of from 2 to 4 WSPR transmissions. It
always sends position, altitude, ground speed, battery voltage, temperature and GPS status. Two
optional additional transmissions can carry up to 72 bits of your own data from any sensors you
may have configured.
The advantage of using TELE for data transfer, compared to other transmission modes, is that it
automatically displays a live map of the balloon path on the QRP labs website, and your additional
telemetry is also automatically collected and available for download.
TELE automatically transmits using the callsign, band, frequency, channel and timing schedule
defined in the Configuration application. Only the callsign and band are user configurable. The
frequency and timing schedule are determined by the channel, which is assigned uniquely to each
U4B. In the configuration screen you have a choice of 3 channels. The transmission cycle repeats
every 10 minutes.
The WSPR transmissions are as follows. Each of the 2-4 transmissions takes 1 minute 52
seconds and the system waits automatically for the correct interval between transmissions.
1 Standard WSPR transmission with Callsign and Frequency defined in the
Configuration application
2 Telemetry transmission containing 5
th
and 6
th
character of Maidenhead grid
subsquare, altitude, ground speed, battery voltage, temperature and satellite status
3 Optional transmission of your own telemetry (approx 36 bits of data)
4 Optional transmission of your own telemetry (approx 36 bits of data)
U4B operating manual Rev 1.00
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