Last month I posted a question as to whether anyone had any suggestions to
help solve an apparent RFI problem with my portable station using MMTTY and
a new laptop. A couple or responses suggested toroids, which I have tried,
but without any luck. I thought that I'd try once more to see if anyone
might have had a similar experience and found a solution. Here is the
equipment/software lineup:
- IC-706MkII, using FSK output from rear ACC connector
- Rascal interface
- USB-Serial converter (Manhattan Computer Products)
- Gateway M325X laptop w/XP Home
- MMTTY v. 1.65
When I hit the MMTTY TX button, the rig goes into TX, but the software locks
up. Hitting the RX button does no good, and when I try to exit MMTTY, I get
a "Program not responding" message and I have to terminate the process to
exit MMTTY. If I then turn off the trcvr and re-start MMTTY w/o re-booting
the PC, the trcvr goes into TX.
I have to manually power-down the trcvr and re-boot the laptop in order to
re-set everything. This occurs even at the lowest output power level (5w). I
have toroids on all leads going to the laptop, as well as aluminium foil
wrapped over the port-converter's components in the in-line plastic-hooded
serial connector. I have tried several different antennas, both during
portable and at-home operation. Nothing works.
Interestingly, I have no problem with PSK using DigiPan and running up to
50w.
I have used this same setup for years with an older Gateway laptop that had
a serial port and never had a problem, even without toroids. I also use the
same software and a Rascal interface for my home station and have not
encountered any problems, even at high-power.
Any more ideas would be greatly appreciated!
73,
Don W5FKX
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