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CHAPTER 3
OPERATION UNDER \IVINDOWS
3-15
•
3.15.2 RXITX Status Table
~
In ARQ mode, CLOVER-II dynamically adjusts its modulation to match the current propagation conditions.
The receiving station measures signal parameters, determines the optimum mode, and sends mode
change commands to the transmitting station. The measured parameters and transmit waveforms of the
two stations are displayed in the numerical table in the upper right section of both tuning screens.
The data columns for each station show:
Modulation= Modulation mode (BPSM through 16P4A)
Signal/Noise
=
Detects signal-to-noise ratio (dB)
Frequency= Tuning error(± 1 Hz increments)
PHS
=
Phase dispersion in log units (low numbers good)
ECC
=
Error correction capacity used (0 to 1 00% XX fail)
TPUT
=
Throughput
This information can be extremely interesting and useful when analyzing
propagation conditions. This data may be saved to disk for later analysis
(see section 3.6.1 ).
NOTES:
1. You may not be able to precisely "zero" the Frequency Tuning Bar on the frequency of the sending sta-
tion. This is not a problem. Some transceivers tune in 10 Hertz steps.
2. If you are the sending station you should avoid tuning at all after a link is made. The receiving station
should use this procedure to refine the link frequency.
3. In CLOVER-II, the CW ID is sent using tone "T2".
3.15.3 Adaptive ARQ Mode
The CLOVER-II Adaptive ARQ mode is a two station point-to-point communications mode using fully
adaptive waveform control. The following steps show you how to initiate an ARQ LINK:
[Step
Action
1
Press [F9] to begin an ARQ LINK or Click on the LINK Button.
2
Type the call sign of the other station in the HISCALL position and press
enter or choose the call of your choice from the pull down menu.
3
An ARQ link will attemp to begin.
Note: Click on the TX EN button to toggle the transmit buffer ON/OFF.
ARQ LINK: During an ARQ LINK, data is transmitted in two ways. VVIlen both stations are "chatting" and
the transmitted data from both sides is relatively short, the data is sent as part of each (CCB CLOVER
Control Block). VVIlen the TX buffer of either station reaches a certain level of fill, Clover begins sending
the information in a series of data blocks, followed by a CCB. Once the data in the TX buffer is sent,
CLOVER returns to the CCB "chat" mode.
HAL990308
DXP38 MANUAL
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