Thanks for all the great input from everyone. I think I will see if I
can swing the Elecraft/Heil pro-set, install the resistor in the rig,
and just switch between the two as needed.
David Wilburn
[EMAIL PROTECTED]
K4DGW
K2 #5982
Don Wilhelm wrote:
Jack,
You are quite correct, I know you and some others have been successful
with increasing the KSB2 R14 resistor value, but that will change the
loading on the MH2/MD2 mics (which can change the audio output
characteristics). Since Dave wants to use the MH2/MD2 directly on the
K2, in this case I believe the external preamp/adapter is the best
approach. Using the mic 5 volt line has its limitations, but with a
short cable between the preamp box and the K2 I have not had problems
powering the preamp - just don't load it down or use a long cable (6
inches to 1 foot is enough).
Of course how to implement it is an individual choice, I can only speak
for the implementation that I see is easiest for all the factors in
consideration, but the final choice is up to the individual builder.
There are many workable choices available.
73,
Don W3FPR
Jack Brindle wrote:
Sigh. Don and I have agreed to disagree on this point. I have used my
K2/100 quite successfully for several years with a Heil Pro headset.
Mine has the HC-4 element.
I would try it _without_ the preamp just to see how it works for you
before deciding you need the extra box. You may end up needing one, or
things might work just fine.
I would also wire the resistor in the microphone connector for the
MH2. Small area to play in, but it gets it out of the way. The down
side is the need to pull power from the K2 out to the connector. I
have learned that the mic power pin is a prime intrusion point for RFI.
On Apr 6, 2007, at 5:03 AM, Don Wilhelm wrote:
Dave,
Since your plan is to use both the MH2 and the Heil headset with the
HC-5 element, I strongly recommend that you jumper the K2 mic
configuration header for the MH2 - all pins jumpered straight across
(use the little configuration jumpers for computer headers) and
solder a 5600 ohm resistor across pins 1 and 6 of the mic jack.
You might also consider connecting the headphone audio to pin 5 of
the mic jack - leave the jumper off the header pin 5 and connect the
audio to the header pin marked "5" with no connection to the pin
marked "FUNC"
Then for the Heil headset, build a preamp/adapter in a small external
enclosure - the headset plugs into the adapter. You will need a
preamp to successfully use the Heil HC5 element.
I have a schematic (it is a bit cluttered, but usable) for a preamp
that was designed just for that application - unfortunately I cannot
attach it to the reflector post, so I will send it to you separately.
73,
Don W3FPR
David Wilburn wrote:
I have a Heil headset that I purchased about 4 years ago. I'm not
sure if it is the "pro" or not. As memory serves, at the time, the
next step up had a dual element with a switch. The headset has an
HC-5 element. I have an adapter to this to connect to my recently
sold, since finishing my base K2, Kenwood TS-570D(G). I have also
purchased an MH2 microphone.
The original plan was to sell a different radio, (IC-718) and keep
the TS-570 and thus the headset. The plan then was to use the MH2
for the K2. I will still be using the MH2 primarily for the K2.
But I want to be able to use the headset on occasion as needed.
I understand the instructions for wiring up the MH2 on the K2. How
will this impact the use of the headset?
This email suggests it only needs straight across jumpers.
http://www.ac6rm.net/mailarchive/html/elecraft-list/2003-01/msg00598.html
If that is the case, and I do have the Kenwood adapter already, then
if I just put the straight jumpers in, I should be fine.
If I want to use the MH2, then I need to either put the resistor in
the microphone somehow (not something I am looking to tackle with my
large hands) or make an adapter cable for the MH2 that has the
resistor in it.
Am I barking up the correct tree hear, or chasing a feral goose?
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- Jack Brindle, W6FB
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