Specifications

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PT200 ON|OFF Default: ON
Mode: PACTOR Host: PB
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PACTOR uses an adaptive data rate selection scheme. The normal data rate is 100
baud. If PT200 is ON (default) and conditions permit, the data rate will be
automatically shifted to 200 baud. If the error rate becomes too high at 200
baud the data rate will automatically be reduced to 100 baud. There can be
conditions where the data rate is frequently shifting, causing a loss in the
actual information data rate. When PT200 is OFF, the PACTOR data rate is fixed
at 100 baud. See the UCMD command for the PACTOR baud rate threshold settings.
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PTConn [!]a(aaaaaaa) Immediate Command
Mode: PACTOR Host: PG
_________________________________Parameters_____________________________________
aaaa(aa) is the call sign of the station to be called.
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PTConn is an immediate command that starts the PACTOR connect protocol. To
start a PACTOR connect, type "PTC" followed by the other station's call sign:
Example: PTC N7ML or, for longpath stations, use the exclamation point
before the call: PTC !N7ML.
As soon as the <CR> is typed, the PK-900 will begin keying your transmitter on
Radio Port 1 with the PACTOR connect sequence.
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PTHUFF "n" Default 0
Mode: PACTOR Host: PH
_________________________________ Parameters: __________________________________
"n" - 0 to 3 specifies the type of data compression used in PACTOR.
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To enhance the effective data rate in PACTOR, a data compression scheme may be
automatically enabled. The number "n" corresponds to the type of compression
used, with 0 disabling data compression (default).
When PTH is set to 1, Huffman compression will be used if it is more effective.
The numbers 2 and 3 are reserved for future compression schemes.
Instead of using the normal 8-bit ASCII representation of a character, Huffman
encoding assigns each character a code that may be as few as 2 bits for the most
used characters to as long as 15 bits for the least used characters. For
English (and most other) languages, the use of Huffman compression results in a
smaller number of bits necessary for a given message.
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