From: G4UXD
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
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 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
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
Source QRZ: The Windows Ham Radio CDROM
SOURCE: The QRZ Windows Ham Radio CDROM |
