Joe,
The Elecraft K3 manual shows pin 6 as 8 volts. This is *not*
necessarily the mic element bias. The bias would be applied directly to
pin 1 regardless of the use of pin 6. Remember that the addition of
bias to the mic AF line is a function of the menu setting rather than an
added resistor as in the K2. The voltage at pin 6 will not be turned
off when the microphone bias is turned off in the menu.
For use with the Elecraft MH2, MD2, and Proset K2, the requirement is
for a voltage to be added (through a resistor) to the AF signal line.
That same configuration *should* work for all electret mics that are
similarly wired and do not have a capacitor in series with the AF line.
Yes, the Elecraft mic pinout is different than Kenwood because Kenwood
uses pin 5 for +8 volts and Elecraft uses pin 6. A Kenwood dynamic
microphone having no preamplifier in the mic head will normally work
just fine with the Elecraft pinout - but user be aware - you should know
the pinout of any microphone you plan to connect. A Heil dynamic mic
(usually HC4 or HC5 element) with a Kenwood adapter will work fine
because neither pin 5 nor pin 6 are connected in the adapter.
73,
Don W3FPR
Joe Subich, W4TV wrote:
I was under the impression that the K3 was wired the same as
Kenwoods for microphone usage. However, In checking the Heil
website, and the subsequent link for mike connections, they
show that pin 5 is 8 V., whereas the K3 manual shows that pin
6 should have 8 V.
Correct, I had not noticed the error but just compared the
Elecraft FAQ vs. the TS-2000 manual and Elecraft show pin 6
for bias and pin 5 as "Func" while the TS-2000 manual shows
pin 5 for bias and pin 6 as "NC."
This means that a Kenwood electret mic will not work with the
K3 unless the microphone is modified.
I'm also curious why my Heil Pro Set headphones seem to have
low output compared to other headphones on various rigs that
I own. Anybody know what the impedence is for the headphones?
The original ProSet had 200 Ohm earphone drivers. A modification
replaced those with 32 Ohm units (I think). The "low output" is
due to the reduced output of most amplifiers when driving high
impedance loads - Yaesu even includes 10 Ohm resistors in series
with the headphones to prevent excess volume in the headphones!
Of course, the higher impedance headphones (and series resistance)
helps cut down the hum, hiss and distortion.
73,
... Joe, W4TV
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