Epson MFJ-1278B manual Digipeat, Dwait OFF, Check OFF Cmsg Retry, Maxframe, Resptime

MFJ-1278B MULTI-MODE ADVANCED OPERATION

Here are a few simple suggestions for operating HF packet that should help to get you started.

1.Do NOT try to hold a QSO on one of the calling frequencies. Use the calling frequency only to establish contact and then MOVE OFF TO A CLEAR FREQUENCY to carry on the QSO. Remember to be aware of the frequencies your station is actually transmitting so you can avoid interference to other services such as propagation beacons etc.

2.Configure your station so that you can hear the activity on the channel. This will allow you to easily avoid interfering with other stations and also to quickly diagnose the problem when throughput suddenly falls off for some reason (usually propagation or interference).

3.If possible, use the highest frequency band possible to communicate with any specific station. The closer you are to the maximum usable frequency (MUF) the less intersymbol interference you will have from multipath effects. If you have a schedule with another station, arrange your times and frequencies accordingly.

4.Set the following parameters off unless you have some specific reason for doing otherwise:

DIGIPEAT	OFF**There is NO reason good enough to enable this function on HF.
DWAIT	0 OFF
AX25V2	OFF
CHECK	0 OFF
CMSG	OFF
RETRY	0**Try forever, but NOT if unattended operation. This allows YOU to be

the one to decide when or whether to give up rather than the MFJ-1278B. Typically you know more than the MFJ-1278B does about whether the other station is still trying or is likely to recover from the latest fade.)

MAXFRAME	1**Multiple frames OFF.
RESPTIME	0**Some stations may have trouble copying your ACKnowledgments

(ACKs) when you respond this fast. This is due to the fact that some radios pump up the AGC voltage during transmit and if the AGC time constant is long, they are essentially deaf for a while after transmitting. You will want to experiment with this value. In general, you