Saw a thread on that not to long ago. They said all you need to do is
snug them up again. Elecraft did not like the thermal paste. Having
dealt with it on high frequency, high power transmitters, I would have
to agree with them. Stuff is a mess to work with.
David Wilburn
[EMAIL PROTECTED]
Going through the archives I think I have satisfied that I'm ok, and
will continue to use the "old" pads...
Thanks!
Jeff
On 2/23/07, Jeff Kinzli <[EMAIL PROTECTED]> wrote:
So I opened up the KPA100 tonight to do a quick mod, and noticed the
thermal pads under Q1/Q2 are a bit worn. It's like th
All aircraft mikes are carbon-equivalent, irrespective of the technology
inside the microphone. So, the mike is a two wire device, one side to
ground,
and the hot side wants to see a resistor on the order of 560 to 1000 ohms
to a clean (quiet) source of 8 to 12 volts. The audio, which will be
Rob
The David Clark aircraft headset or any mike for aircraft use are
designed to work the same as carbon mikes. The pin out is sleeve ground,
Ring mike audio, and Tip key. They use the carbon mike bias to power an
internal amplifier. the output is way to high for use with a ham rig of
any ki
So I opened up the KPA100 tonight to do a quick mod, and noticed the
thermal pads under Q1/Q2 are a bit worn. It's like the pressure of me
tightening down on them has smashed through them a bit on the outer
edges of the pads.
Is there an issue with a path to ground here, or are they strictly
ther
Don,
I can tell you that the PTT function is not on the headset, and the audio input
to the headset (150 ohm impedence) is on another plug which I have already
sorted out.
I guess I will have to dig up a schematic from somehwere.
Thanks,
Rob
KC6ROC K2 #5924 in progress
"Don Wilhelm" <[EMAIL PROT
Rob,
If you can tell us what the functions of 3 wires are, then we should be able
to tell you how to connect it.
Pure speculation tells me that one is AF, another is ground and the third
may be either the voltage feed to the electret element or it may be the
audio to the headphone section, or it c
I have a query for the group. I am a pilot and have several Dave Clark H13.4
headsets with noise-cancelling electret microphones that terminate in a 3-wire
connector. Can these microphones be configured to work with the K2?
Rob
KC6ROC K2 #5924 in progress
"Joseph Trombino Jr" <[EMAIL PROTECTED]> wrote:
>Can any kind soul out there point me to the schematic for the microphone
>preamp for the K2 that is used to boost the audio from Heil HC4 and HC5
>elements.
>
>I tried to google it without success.
>
>Appreciate the assistance.
>
>
Ouch!! That's a great story though. I got similar personal support from the
National company back in the 60's. Elecraft's excellent customer support
isn't something new; it's just something that's been missing from too many
companies for too many years.
You might try the suggestion Don Wilhelm m
On Feb 23, 2007, at 2:03 PM, Ron D'Eau Claire wrote:
It's a great mic and a real icon. If yours has the original
element, it may
well be a Rochelle salts crystal element. Of so you're fortunate it's
survived. They are easily destroyed by physical shock (knocking the
mic over
or dropping i
Can any kind soul out there point me to the schematic for the microphone
preamp for the K2 that is used to boost the audio from Heil HC4 and HC5
elements.
I tried to google it without success.
Appreciate the assistance.
73, Joe W2KJ
_
Don,
There was a report somewhere within the past few months that one ham
successfully used his unamplified D-104 with a low impedance rig (it may
have been a K2). He simply added a series resistor to keep the mic looking
into a high impedance and it worked fine. I have not tried it here, but I
Dave,
Your meter is reading the voltage outside the KX1 while the KX1 is
displaying the voltage after the series protection diode, hence the slightly
lower voltage. Yes, you can expect about a 0.3 volt drop.
73,
Don W3FPR
> -Original Message-
>
> I am building KX-1 SN 1625. Concerning
Unlike almost all modern mics, the original D-104 has a shaped frequency
response curve for optimum speech quality. It has a broad peak in the 3 kHz
range to pick up the sibilance essential for intelligibility, with good
roll-off characteristics at the higher and lower frequencies.
Since filter S
David wrote:
>display registers 12.2/3 volts; my DMM across the
>battery terminals registers 12.60 volts.
The KX1 MPU doesn't sense battery or power supply output voltage until it has
passed through reverse polarity protection diode D2 or D3 (1N5817). At the
current that your KX1 is drawin
Just to let people know that I worked K8CW this afternoon on 18MHz. I was using
the K2 with output power of half a watt into a 2 x 20 metre doublet. This was
following a discussion on QRPP working at our local radio club the evening
before. I regularly work into eastern USA with the K1 at 3 wat
If anyone needs an already built KXB30 30M adapter for
their KX1, I will sell you mine for $12 (includes
postage). My KXB30 works perfectly but is no longer
needed for my KX1.
I have the already-built KXB30, and its 8 page
Assembly and Operating Instructions ... all in mint
condition.
Mike K6V
Hi there,
I have just got around to building the KPA100 (to Appendix G - Rev. C-5) for my
K2 (53 * * ), and I have got to the voltage test on R12, on page 47 of the
manual, where it asks to verify that the voltage is within the 100 -110VDC
range. Upon performing this check, mine can only manag
Hi
According to the instructions for the KX-1 Power
Output Mod, bundled with the KXB3080 Module, the power
mod is only to be used if the output of the KX-1 is
low. They are talking about 3W or less with a 14 volt
supply. My output with 12.6 volts is 4W, so I did not
do the mod. I suppose if you
Hi all,
I am building KX-1 SN 1625. Concerning Alignment and
Testing-Part 2, page 44 of the manual, testing
approxiomate power supply or battery voltage: The
display registers 12.2/3 volts; my DMM across the
battery terminals registers 12.60 volts.
Is this discrepency with the definition of
heh heh
I loved your line ... "towers almost a foot over my K2"
man, the mike is bigger than the radio!
I can visualize a ham wrestling with a giant mike connected to a
teeny radio ...
That brought smiles to my face, thank you.
Ron, wb1hga
"Elmer the inquisitive"
[EMAIL PROTECTED] wrote:
I h
I have been reading about the different microphones used by fellow K2 owners.
A fellow ham encouraged me to try a vantage, (1960s) D-104 crystal mic for
the K2. I had been using a Kenwood MC-48B and it was working OK. I knew that
the straight D-104 mic would not work with the K2 as crystal m
On Feb 23, 2007, at 9:29 AM, Darrell Bellerive wrote:
On February 22, 2007 09:44 am, Don Wilhelm wrote:
Look at the Elecraft BL2 for a switchable 1:1/4:1 balun, it will
handle up
to 250 watts. If you do not need the switchable arrangement, the
BL1 can
be constructed for either a 1:1 or a 4
On February 22, 2007 09:44 am, Don Wilhelm wrote:
> Look at the Elecraft BL2 for a switchable 1:1/4:1 balun, it will handle up
> to 250 watts. If you do not need the switchable arrangement, the BL1 can
> be constructed for either a 1:1 or a 4:1 configuration and its power rating
> is 150 watts. A
Lowell,
Don is giving some good advice here, as usual. The circuit of
balun that I built is essentially identical to the BL2. I made mine
using two FT-240-43 toroid cores - I needed a balun in a watertight box
since it located outside in the rain and snow. I also wanted a balun
th
Ok, thanks. I will take a look around later today. I did not see
anything else "go" at the time. Man, and I thought I felt bad before
you email.
***Yes***, the note about changing the menu is in there. ***So the
fault is mine.***
I did all the rework eliminators requirements on page 59.
Wait until you have the KXB3080 option installed and tested. Then check
with a 12 volt power supply to see if you have 3 watts output on all bands.
If less than 3 watts, install the power mod.
Do not install the power mod if you have at least 3 watts output on all
bands, it may overstress the out
Dave,
I do not have enough data to tell you whare to start on the current problem.
Check voltages and look for charred components or burned PC board traces.
Be certain the 8 volt regulator on the control board is supplying voltage
and follow its path onto the RF Board.
On your 'original problem',
29 matches
Mail list logo
