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A cable with a furnace problem

At the end of Summer 2020, I took advantage of a sale price and a 60 day trial period to buy a Morrow Audio DIG1 cable. The cable is of minimalist design with no shield and I was skeptical when I actually saw it. It didn't take long before I was convinced that it was better than the Blue Jeans digital cable I had used for more than 4 years. The DIG1 outperformed in every way but one.

The change of seasons has dictated that we use the furnace to heat our house. Almost immediately after the thermostat relays click and send a message to turn on to the furnace, there's a brief sound dropout. When the thermostat clicks again, the steel rod is withdrawn, and the furnace begins its shutdown, the audio lessens in volume momentarily. The heating and cooling technician that inspected our heating system explained to me that when the thermostat sends its signal, a steel rood drops down to the burner unit to serve as a ground path. When the temperature reaches its desired setting, the steel rod is withdrawn after a signal from the thermostat. I know that I'm not a heating and cooling guy so I may have misinterpreted the explanation.

I didn't have that kind of problem when using the BJ digital cable or after the DIG1 was inserted during A/C season. The most logical thing I can attribute to the reason for the glitches is that the moment of establishing and removing the ground path for the burner is that a large pulse of interference is created. That burst or pulse is strong enough to be picked up by the DIG1 which acts as antenna for that very brief moment. At least that's my best conclusion so far.

While the easiest resolution to this problem is for me to open up my wallet again and grab the Visa card to use it for buying a shielded cable. Before I do that, I'd like to try finding a solution that would enable me to use the Morrow cable without the glitches. Does anyone here have suggestions?











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Topic - A cable with a furnace problem - Postal Grunt 13:27:56 12/17/20 (13)
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