I have 5 new in box Harris Consolettes, they all have a wireline hum in them, These are not digital DDC100 boards, these key up with wireline control. However there is a small hum on all of them, the Motorola MCC7500 picks up the hum and amplifies it, even with AGC turned off at the core the hum is still there. Anyone know how to eliminate the hum? Cobbledick you want to chime in?
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Wireline Hum in Harris M7100 Consolette
- Thread starter rodfarva
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DisasterGuy
Member
We have had many wireline control M7100 desktops in service over the years and not had this problem. A couple thoughts:
-Ground potentials the same? Is everything racked to R56?
-Have you tried a 1:1 audio transformer inline?
-Have you considered interfacing to the radio itself with COR and PTT to the CCGW bypassing the tone remote board?
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-Ground potentials the same? Is everything racked to R56?
-Have you tried a 1:1 audio transformer inline?
-Have you considered interfacing to the radio itself with COR and PTT to the CCGW bypassing the tone remote board?
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Yes everything is R56, we have tried the 1:1 transformer but it causes issues with changing channels and does not let the function tone operate properly, we have not yet gone as far as COR or relay keying from the CCGW. The hum is on the 4wire pair of the consolette, it can be heard with a buttset...
DisasterGuy
Member
When I get back in the office Monday I will take a look at TSM's to see if there was ever anything on this. On a related note, I have 3 M7100 radios interfaced into a Harris VIDA UAC linking to 2 EDACS groups and a P25 conventional channel. We ended up just using the radios and pulling PTT and COR via the DB37 as it was cleaner than depending on RX VOX via the tone board. If you need to do channel steering that may take that off the table though.
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