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Triple decker audio question

S

SFM-Ptgal

I've connected the 3 cart players of my Harris triple decker to the same point, in paralel, joining on a jack for direct monitoring on a 400 ohm headphones.
While playing a cart the level is one, if two decks are running the audio signal decreases if 3 it decreases even more. When one stops the audio rises a bit, two the same even more. They have transformers audio output.
Is this normal under the setup I've made?
 
Try connecting the + and - outputs of each deck through a 220 Ohm series resistor,and then tie the outputs together via the resistors.

Depending on exactly what happens with the way the cart deck mute themselves when a cart is done, you might be seeing impedance variations on the unused decks, causing the audio problem you describe.

-Cornelius
 
I've connected the 3 decks onto the Harris Stereo Gatesway, one deck for each input. All the decks keep their level independently from how many are running. U are right CGoud!

Another question about the Stereo 80: Is the audio level variation when tweaking the input keys of a determined channel normal? If the 3 carts switches are addressed to the their fader the level is one. If I address a key to the previous fader or simply switch it of the level increases, If I tweak two switches it increases even more on the remaining cart. It's hard to describe. I hope u understand. Thanks!
 
I don't have any experience with this unit, but I do have a theory. I am wondering if the unit is basically running its own AGC type system, when you route all three decks into one input. The theory is with all the audio processing most stations use, this level changing issue wouldn't be noticed.
 
cgould said:
Try connecting the + and - outputs of each deck through a 220 Ohm series resistor,and then tie the outputs together via the resistors.

Depending on exactly what happens with the way the cart deck mute themselves when a cart is done, you might be seeing impedance variations on the unused decks, causing the audio problem you describe.

-Cornelius
Click to expand...

Cornelius, I seem to remember that ITC, or one of the other companies, had a white paper that described how to interface all three decks into one input of a console. They used relays that performed two functions. The front porch of the SEC tone would trip the next deck, and the back porch of the SEC tone would mute the deck that was playing in case there was some residual "cue up" noise.

It could have been some other company, but I could have sworn it was ITC. I've not worked on one since 1996.

Optionally, driving each deck into a small mixer would enable individual level control. One of our local stations did this with a Symetrics stereo mixer with the output feeding the console.
 
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