Use a 5" or 6" TMP cable and hook it from J6 on the KREF3 (same as old
synth) to either J83 or J1 on the KSYN3A.
73,
Rich AC7MA
On 06/12/2016 09:29 AM, Michael Murphy wrote:
I am about to install a new synthesizer board in my K3. I do not have the
2nd rx or a 2 meter module.
I am not clear
Jim,
About 30 uA with the radio off, and about 1 mA with it on.
73,
Rich AC7MA
On 06/07/2016 08:16 AM, Jim GM wrote:
Hi
Does the KXIO2 board Draw power with the radio turned off? If so how much does
it draw off the battery?
With the KX2 turned on how much is the KXIO2 power draw?
Jim
The KXBC3 checks battery voltage before starting a charge, and if it's
not within a reasonable range (6.4V to 11.2V) it will indicate an error
condition. Battery manufacturers recommend not discharging cells below
0.9V, and healthy cells will normally hold a residual charge pretty well
Nick,
I think Lyle meant to type RX I/Q, not RX ISO. Turning on the RX I/Q
outputs (which is accompanied by the DSP load leveling) will reduce the
12 kHz spur by 15 to 20 dB typically. Doing this also increases overall
supply current by about 10 mA.
When looking at these spurs on an audio
Hello Klaus,
On 07/30/2013 02:20 AM, Klaus Dittrich wrote:
...
I wonder why this isolation amplifier is off by default,
but assume the reason is to save battery power which
does not matter in case of use as home station.
So I would like to know if there are any degradations
in IP3 or more
That one reminds me of a story told some time back at one of our local
QRP group meetings. One of the fellows once had a coworker who claimed
the source of the power significantly affected audio quality, and that
power from a hydro generator produced much cleaner sound than power
from a
Phil,
That is correct. The battery '+' and external supply '+' are connected
together. The voltage at the battery's negative terminal is measured
and subtracted from the voltage at the '+' side. So with no batteries
installed, 0V would be read at the batt '-' side. And when no external
Mike,
What you would be checking for is opposite sideband suppression and
you'll need a very strong single tone signal source. S9 + 20 or
thereabouts is a good level, and this can be on or around 20m. There's a
procedure to do the calibration in the KXFL3 installation instructions,
but the
Ken,
If you primarily want to keep the clock alive, I think the 2000 mAH
Sanyo Eneloop are hard to beat, based on cost, availability, and self
discharge rate. I'd avoid Alkaline cells for long term use because of
the potential damage from leaking.
73,
Rich AC7MA
On 06/27/2013 11:58 AM,
Hello Steve,
It sounds like the menu is set up for a 2m transverter. Go into the
menu and find XV1 ON, and make sure the selection is 'no' (before making
a change, you have to unlock it by holding RATE down for a few
seconds). Hope this helps.
73,
Rich AC7MA
On 06/10/2013 01:08 PM,
Brian,
The TX I/Q signals are only routed internally and aren't at any external
connector, though they do have labeled test points. The I/Q connector
on the side is an RX output only.
73,
Rich AC7MA
On 06/08/2013 04:49 AM, Brian Machesney wrote:
I would like access to the I/Q signals
As the batteries discharge and reach the knee where voltage begins to
drop off quickly, imbalances in capacity between the cells can lead to
wider voltage differences between the individual cells. If discharge
isn't stopped in time, it's also possible for the weakest cell to be
subjected to a
An LDO is also a simple option for a higher voltage pack. KX3 RX
current decreases as voltage goes up due to the internal switching
regulators, but minimum TX current at 10W out will likely be somewhere
around 13V. The optimum between the two will probably be around 13.5V,
so that would be
Bob,
I think you forgot to multiply by 24hrs/day for your annual energy
consumption, but your conclusion is still valid. Even at a ~440 mAH for
one year, the battery drain can be ignored for practical purposes. Most
of the current is consumed by the shunt regulator and the resistor
Ken,
The lithium batteries should be able to keep the clock going for quite a
few years. When the KX3 is off, the KXBC3 current should be around 50
to 75 microamps, depending on battery voltage, which comes out to
roughly 1.5 mAH per day.
73,
Rich AC7MA
On 03/15/2013 08:33 AM,
Jim,
The FET shouldn't have had any problem with 50 mA. It's a 2N7002 and is
rated for 115 mA continuous and 800 mA pulsed, with 60V max voltage when
off. One possibility is that the load being switched was inductive
(like a relay), and the FET's voltage rating was exceeded when the relay
/12/2013 05:01 PM, hawley, charles j jr wrote:
The 2N7002 has an internal diode for any inductive collapse.
Sent from my iPad
Chuck, KE9UW
(Jack for BMW motorcycles)
On Mar 12, 2013, at 6:58 PM, Rich Heineck ric...@frontier.com wrote:
Jim,
The FET shouldn't have had any problem with 50 mA
Fred,
Most likely the battery temperature got up to 45 degrees C and charging
was suspended until they cooled to 40 C. Normally a message should
appearwhen that happens.
73,
Rich AC7MA
On 02/01/2013 12:02 PM, Fred Carvalho wrote:
Hi Folks. Sorry if this has been asked/explained before.
During charge at 200mA, the NiMH batteries can typically reach 1.5V
each, for 12V total. Add in the extra voltage for path resistance,
isolation diode, and charging regulator overhead, you get up over 13.5V,
which is why the recommended voltage is 13.8V. Charging at lower supply
voltages
The recommended 13.8V minimum is for the external supply, and does take
into account the diode drop.
73,
Rich AC7MA
On 01/27/2013 03:42 PM, Ron D'Eau Claire wrote:
Mine charges just fine from a 13.8 VDC supply.
73 Ron AC7AC
-Original Message-
Hi,
I believe your PS reading is too
John,
The 160/80 meter mod that improves IMD dynamic range requires replacing
a total of four parts in the T/R switching and one of the BP filters.
The mod would not be overly difficult for someone proficient with SMD
rework but I wouldn't recommend it for someone who isn't. To answer
your
Gary,
As an alternative to using RX SHFT, you could try reducing gain in the
RF section if you have the preamp on. Try preamp at the 10dB setting or
preamp off.
73,
Rich AC7MA
On 01/09/2013 07:15 AM, Gary Auchard wrote:
I posted a question concerning an issue with broadcast band
On 12/15/2012 3:44 PM, Peter Lambert wrote:
I charged the batteries again overnight. They were completely flat (8.2V)
when I started the 16 hour charge cycle. About 2 hours before the cycle was
due to finish the display showed not0-40C. The ambient temperature was
27C, the PA 33C and the OSC
Hi Adrian,
There were some problems like this that had occurred once in a while, but should now be
fixed with MCU firmware version 1.27
73,
Rich AC7MA
On 11/24/2012 1:41 PM, Adrian wrote:
Hi all
I have the internal charger option fitted now.
I noticed when the radio is off you get the
If operating CW, another approach that could be used to avoid a strong signal
in the
opposite sideband is to hold the MODE button to go into CW REV.
Rich AC7MA
On 8/14/2012 1:47 PM, webrehm wrote:
The Sherwood test of the KX3 says this in the notes for the superscript V
At 1 kHz
Ed's description provides a good overview but I can add a couple things that
might help
fill in some details.
There are two TCXO specs of general interest. One is absolute frequency
accuracy relative
to 49,380,000 Hz, and the other is stability or drift. The absolute accuracy
of the TCXO
14.318 Mhz has been widely used on PC motherboards going back to the original
IBM PC-AT.
That would be high on my list of suspicious sources.
73,
Rich AC7MA
On 4/24/2011 12:56 PM, Jim wrote:
That tone has been there for years. As long as I remember.
73 de Ke4wy Jim
Sent from my
I just checked, and it looks like even the original 8088 IBM PC had a 14.318
MHz
oscillator on it. And it's also one of the ISA bus signals.
Rich AC7MA
On 4/24/2011 10:17 PM, Kevin Rock wrote:
Which crystal frequency did they use on the IBM PCs before the AT came out?
Kevin. KD5ONS
The K3EXREF uses the 10 MHz standard as it's time base to measure the K3's TCXO
and passes
an error value to the K3's MCU every few seconds. No TCXO frequency control
takes place,
thus no increase in phase noise. Frequency compensation is done in software by
automatically updating the REF
Hello James,
You are correct on #1 and #2, as long as the signal amplitude feeding the
K3EXREF is in
the range of +4 dBm to +16 dBm. The Thunderbolt 10 MHz output is typically
+12dBm (about
2.5V p-p), for example.
73,
Rich AC7MA
On 4/5/2011 12:11 PM, James Sarte (K2QI) wrote:
Hello
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