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Hi
Balanced would be better but unbalanced should be OK. You are trying to 'prove a point' so use as many different bits of kit as you can find. Gear SHOULD be powered up to 'terminate' the input but it is worth trying it switched off as well.
You could even try a dynamic mic. This may sound bizarre and of course you won't get much audio out but the point is that it will 'terminate' the input on the end of some cable.
If you do try a mic, try shorting the casing to some earthed metalwork (rack, PC or whatever) and see if that brings the radio up.
Is it an AM or FM station? I presume it is local?
When identified, try to find where the transmitting aerial is located. If it is on a nearby roof you may have to get into 'desperate measures'.
If you have a shorter cable available to hook between the gear and monitor, try that too.
There are other threads on 'hum' and RF pickup, have you looked at those?
There were suggestions for a guy with problems with a UA610 mic pre.
If several bits of gear and 'any' cable is bringing the problem you really do need to be getting on to KRK, at least for ideas.
Are you aware of any other gear picking up the radio? listen to putputs of mic pre's for example ON HEADPHONES.
Matt S
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