Cyberia wrote:
Is your KSB2 manual revision E (July 20, 2004)??
If so, then you need to carefully examine the notes at the top of the table
for the ICOM mikes. The note at the top of the table says NOT to connect pin
2 unless the MIC is pre-amplified. It says to connect AF (pin1) to 5V
through a 10K resistor for HM-12 (your MIC) or 820 Ohms for HM-7.
Yes it is Rev E and it says, to quote "Do not connect pin 2 unless mic
has internal preamp".
My mic does have an internal preamp and therefore according to the table
pin 2 would appear be the logical choice.
OTOH a dynamic moving coil mic, such as the early Kenwood models which
have the mic insert directly connected between pin 1 and earth do not
have an internal preamp and do not require the 5v being presented via a
resistor.
What I think the table is referring to is that some later mics have the
preamp voltage fed up a dedicated wire connected to pin 2. In my older
mic the signal cable (pin 1) doubles as signal and preamp voltage carrier.
73,
Ken.
--
Ken G3WCS <[EMAIL PROTECTED]>
IO83rh : Cheshire : NW England
(+44) (0)1606 892677 (home)
(+44) (0)7733 400950 (mobile & sms)
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