What else uses the Cab-1 Frequency?

If memory serves me, the old CAB-1 used high HF frequencies in the same band as CB radios and some ham radio.  I never had an issue with mine but I suppose a high power (legal or otherwise) HAM or CB rig could cause an issue.  Do any of your neighbors have a large antenna array?  They typically look like TV antennas on steroids except the elements are closer to all the same length.

Tony

I swear my garage door opener is on the same- same frequency... I lose total range sometimes on my garage door opener remotes after running trains... That or someone else is running trains in the neighborhood!

27 MHZ. Apparently R/C toys and models use this same frequency. There are different channels, but not that many.

Unless you've bought the rare crystal set, the CAB1 and BASE1 operate on 27.255mhz, that's the "stock" frequency.  So, any change in band will have to be done by the interfering device.

There's definitely a CB frequency that shouldn't be used, but gets used anyway. Users with high power CB's can cause issues. I also believe some plug-in house wiring devices can be close in frequency.

A next door neighbor could be bleeding signals into your electric service. Do you have any of those remote on/off devices in your house?

There was good thread about this about a year and half ago. Perhaps try some forum searches. Dale Manquen had some comments. Perhaps a noise filter at the receptacle would help for over the wire stuff.

PLCProf posted:

Last I knew, 27.255 MHz was CB channel 23.

It's also channel 6 for toy class R/C devices

Our baby monitor drastically interferes with the Legacy System to the point where it is unusable. So, at bedtime, I toggle over to my hardwired postwar ZW.

It's unlikely that the interference is from an outside source due to the type of digital modulation used by TMCC, as most other devices in this band use a steady carrier or a single-sideband suppressed-carrier.

The one time I had the same symptoms I was able to narrow it down to have accidentally left a prog/run switch in "prog". Everything worked fine, but the throttle kept creeping up w/o any input from the CAB-1.