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- From: G4UXD@GB7OAR
- Subject: PK-232 Lockup Cures
-
- Dear Reader!
-
- There was such a response to my note regarding "Cures for PK232 Lockup"
- that I've had to put out a general bulletin!
-
- Here is a synopsis of some of the replies I got to my Help! cry:
- Lenny (the sysop @GB7LIV) reported that he ended up putting 0.01 uF disc
- ceramic capacitors between ALL connections to the radio (232 also? Derek) and
- ground. He also fitted a heavy braided earth strap from the chassis of the TNC
- to TRUE earth (onto the earth chassis of the computer or to an earth point on
- a 13 amp socket outlet). The problem then stopped TOTALLY.
-
- Chris (G6FCI @ GB7FCI) reported a problem with his PK232 locking up when
- a fluorescent light (and other appliances sometimes) was turned to spikes getting onto the earths in the RS232 between
- the computer and TNC. Heto solve it and is not quite sure
- which effected a cure.
-
- 1) Stick a decoupling cap between the RTS and CTS lines and earth (he thinks
- that was where he put them).
-
- 2) Strap the signal and frame ground lines together at the TNC and computer
- end of the RS232 cable. He knows that technically the two are supposed to be
- separate, but suspects that the problem arises when the signal ground ends up
- at a different potential from the frame ground. He hasn't had the TNC lock up
- for 6 months or more.
-
- Alex (G1FBY @ GB7BMX) reported that he has had his 232 for two years. One of
- the first problems he encountered was lockup. All investigations of the unit
- proved OK. One Sunday his XYL was using the washing machine and dishwasher for
- long periods of time and the PK232 locked up 6 times. It was run on a fully
- regulated power supply. He fitted a Radio Spares spike protection socket to
- the mains plug of the power supply and all has been FB since.
-
- **********************
- Hope this is useful,
- 73 de Derek [G4UXD @ GB7OAR]
-
- Copied from the QRZ! Windows Ham Radio CDROM
-
-