The TW-100Â is a nice, but not well known shortwave transceiver. It was built by Transworld in California for government agencies and NGO’s. The set is solidly build and uses high quality components.
A while ago I’ve spent some time scanning the complete service manual of the transceiver. It should be complete and I will correct omissions or errors as far as possible.
When you fine-tune the operating frequency the TW-100 has the unfortunate habit of muting the speaker on each keypress/frequency step.
This mod describes how to disable this muting facility on your TW-100.
The TW-100 features a high pass filter to reject low frequency signals. This filter is very effective to suppress the signal of your 10MW MF station 2 miles away. Unfortunately, if you don’t have this station and would like to use the TW to listen to signals below 1600kHz, there is no way to switch it off.