One correction. The HF Packer is not a 50w amp. It's about 45w at 160m,
and then steadily less as you go up in frequency (40w for 80m, 35w for
40-20m, 30w for 17/15m, 25w for 12m and about 20w for 10m). It doesn't
support 6m. These numbers come directly from a graph in the HF Packer
manual.
I didn't see the original reply, but I just wanted to clear up one
misconception. Homeowner's insurance covers stupidity. Unless it can be
proved that you put that ladder line on the roof and ran high power
through it with the intention of burning the house down, you would be
covered.
73,
ran my feeder in an appropriate location.
Jim / W6JHB
On Thursday, Jul 4, 2013, at Thursday, 12:52 PM, John Marvin wrote:
I didn't see the original reply, but I just wanted to clear up one
misconception. Homeowner's insurance covers stupidity. Unless it can be proved
that you put
So, I got my KXPA100 kit and have assembled it. But I'm having trouble
keying it with my transceiver (HPSDR Hermes with alterations to support
driving the KXPA100). My circuit didn't have any trouble keying my
previous amp (a HFPacker V4). If I manually short the KXPA100 key input
things
Lyle,
Thanks. I would have thought that a transistor driver would have been
used to drive the I/O pin. Anyway, I measured the voltage drop across
the key input of the KXPA100 when the transceiver was attempting to key
the amp. The drop was 2.1 volts. Since the voltage for the circuit is
On 1/14/2014 2:08 PM, John Marvin wrote:
Lyle,
Thanks. I would have thought that a transistor driver would have been
used to drive the I/O pin. Anyway, I measured the voltage drop across
the key input of the KXPA100 when the transceiver was attempting to
key the amp. The drop was 2.1 volts
whether I can go with a simple
change or something a little more involved.
John
AC0ZG
On 1/14/2014 2:08 PM, John Marvin wrote:
Lyle,
Thanks. I would have thought that a transistor driver would have been
used to drive the I/O pin. Anyway, I measured the voltage drop across
the key input
I got a variety of suggestions, and decided to go the easiest route
(since it worked) of removing the current limiting resistor and
switching the diode to a schottky diode. The extra diode is required in
my case because the PTT also keys an internal TX preamp whose keying
circuit is run on
As you mentioned, the W2 utility shows greater accuracy, although just
because it shows values in fractions of a watt, it doesn't mean that it
is that accurate. However, the nice thing about the W2 is that it has a
fairly nice calibration facility. So if you have or can borrow a higher
Bob,
You should try installing the W2 utility (obviously you need to connect
your W2 to a computer via the USB/serial cable that came with the W2 in
order to do this). It shows the SWR and forward power with more
precision than you get with the led front panel display. It would be
properly, 1mW drive should produce 20 watts output, not 30. Also, you
should try to avoid sending more than 1mW to the XV50.
Final question. How were you generating the test signal and what mode
were you using?
John
AC0ZG
On 1/23/2014 8:10 AM, Bob KD7YZ wrote:
On 1/22/2014 02:05, John
One issue with the XV transverter option is that they only cover part of
each of the bands, dropping the regions primarily used for FM repeater
and FM simplex use. Even if someone wants the transverter primarily for
non FM modes, they still might want to be able to also use the rig for
FM
I'm not sure how easy this would be to adapt to an existing product like
the K3 or KX3. Note that the primary change is in the transceiver and
not the PA, i.e. this is not something you would add to the KXPA100 or
KPA-500, other than perhaps the head end of the PA output sampler. The
Rick,
Be careful who you call ignorant. HDTV is NOT UHF only. After the
digital transition most stations went to UHF. However, there are still a
lot digital stations in the high VHF range (channels 7-13). I can
receive 4 high VHF stations in my area (Fort Collins, north of Denver
CO).
It looks like there may be multiple ways of controlling power on the
KXPA100. Obviously there is the front panel power switch. Another method
is that the KX3 can turn the amp on. Does anyone know how that is
accomplished? It appears there is a PWR ON pin in the 8 pin control
connector, but
The suggestions to try a dummy load first are right on. Do you have the
built in ATU, or just the KXPA 100? If you have the ATU I would try both
antenna outputs.
If I had to guess what the problem is I would guess that you didn't seat
the antenna connector from the back panel correctly to the
Just a thought ... perhaps you should consider having an alternate
frequency on one of the WARC bands for major SSB contest weekends (e.g.
somewhere on 17m).
John
AC0ZG
On 3/29/2014 9:33 PM, Phil Shepard wrote:
The WPX Phone contest running this weekend will make operating our net
Am I reading something wrong? You say that you would need +/- 144 Hz,
and Wayne is saying that you can get +/- 10 Hz with the extended
temperature compensation. That seems that it would be good enough.
I'm also seeing all this complaining about stability, and the only
counter example appears
I logged in for the first time, even though my only significant piece of
equipment is the KXPA100 amp. Band conditions weren't great, so it's
possible you just couldn't hear most of the people loggin in. Obviously
you didn't hear the net control or the primary relay. I am surprised you
didn't
Joe, I think you read Ross's post differently than intended. I don't
think Ross was suggesting that Elecraft do their own USB to RS232
converter chip or provide a native USB interface with custom Elecraft
drivers (although there would potentially be other advantages to a true
USB interface,
Wow Matt, Thank you, Thank you, Thank you. I've been off the air since
last Saturday trying to diagnose my problem. I had problems last
Saturday and people were saying my signal was breaking up. I originally
thought there was something wrong with my transceiver or settings. I
carefully traced
There's some wrong information being propagated here. Somehow the
failure of frequency comparators and/or frequency standards that were
based on doing a PLL with the CARRIER of the WWVB signal is being
extrapolated to the failure of all Radio Controlled Clocks which do not
track the carrier
Hi,
I've been operating with an OpenHPSDR Hermes driving a KXPA100 for quite
a while (I ordered my KXPA100 on the day that Elecraft started taking
orders for it). I just ordered a KPA500/KAT500 combination for higher
power operation. My plan is to drive the KPA500 from the KXPA100. I know
I know this thread is supposed to be closed now, and hopefully this
would be obvious, but you should also wait for the fans to stop before
"pulling the plug". You should always turn the KPA500 off with the
switch (or the KPA utility) first, wait for the fans to stop, then you
can use the back
Dave,
Perhaps you want to turn on your amp manually each time. But what you
may have missed is that 7 watts is doing more than just detecting
whether the power switch on the front is used or not. When the KPA500 is
"off" the RS-232 connection on the back is still live, and there is a
I want to echo that a KPA-1500 be the same as the KPA500 in terms of
ease of use and interface, solid state, QSK switching, etc.
Some of my points:
Some have said "at least 1000W". In my opinion, that is not a big enough
step above the KPA500, but some will make the case that 1500 isn't
Put me down as a vote against a built-in antenna tuner. I prefer a
separate external tuner that integrates well with the amplifier. It
allows for a lot more configuration flexibility.
73
John
AC0ZG
On 3/28/2017 5:00 PM, Paul Van Dyke wrote:
Ralph Parker said my list.
1500w output, 160 -
Sorry, it is you are confusing the two. It was Feynman on both counts.
Sagan would have been 8 years old when the Manhattan Project was
started. Feynman was also on the Rogers Commission that was tasked with
investigating the Challenger disaster (Carl Sagan was not involved).
73,
John
AC0ZG
Perhaps you are confusing VLF with VHF? The article talks about VLF
transmissions. VLF is 3-30 Khz. There are no ham bands in that range.
73,
John
AC0ZG
On 5/18/2017 6:23 PM, Phil Hystad wrote:
I thought some other ham operators might like to read how they are helping
to build a protective
Thanks for this idea. I prefer a foot switch, and I've already had one
of the Heil switches die on me in less than 2 years of use. Right now
I'm using one I got from Radiodan.com. The owner is a member of my club,
and I bought it at our annual HamFest. It looks to be of decent quality,
but I
Unless you ran it under emulation (e.g. wine or something like that), I
think you are misremembering. KX3 utility is currently only available as
X86 32 bit application. It can't run natively on a Raspberry Pi.
73,
John
AC0ZG
On 4/12/2018 10:43 AM, Thorpe, Jeffrey wrote:
I don’t remember -
In general, the quality of service that you perceive from the USPS, UPS
or FedEx is almost completely due to the behavior of your local delivery
person. None of the carriers treat your package with kid gloves, and a
lot of it is automated such that they really don't pay any attention to
Charlie,
Since the KPA100 is an add-on for the K2, I assume that you mean the
KXPA 100. Why can't you drive your 811 with a KXPA100?
73,
John
AC0ZG
On 3/2/2018 7:41 PM, Charles Carlon wrote:
Time to update and organize the Shack. I currently have
Icom 756 Pro III
Icom 7100
KX3 with
Well there is this interesting quote on the translated swiss website:
The prices of the device, its options and the accessories have not yet
been fully defined.The statement from Eric Swartz, co-founder and
owner of ELECRAFT reads:/"The K4 will be cheaper than the K3S with
comparable
I guess it must be "morning" on the east coast. The K4 is now officially
up on the front page of the Elecraft website, and you can now submit
pre-orders again, for those who are anxious to do so.
73,
John
AC0ZG
On 5/16/2019 1:23 PM, Wayne Burdick wrote:
Reporting live from Chicago, en route
looking for operators, and Elecraft is a sponsor for the event,
providing four KX3's and four KPA500 amplifiers for the event (Thanks
Wayne and Eric!). So if you decide you want to take a trip to Fort
Collins to help out, you may be very familiar with the equipment used!
73,
John Marvin
Well, if budget permits, I would recommend the Keysight DSAZ594A. This
would be especially useful on some of the higher amateur radio bands.
73,
John AC0ZG
On 12/9/2020 7:31 AM, inventor61 wrote:
I would be remiss, as a Keysight employee, to not mention the option of
going with something like
Luckily for you, they were not aware of the FCC OTARD rules which
absolutely override covenants with respect to small satellite antennas,
rooftop TV antennas, and wireless ISP/cell dishes/antennas. However, the
OTARD exemption does not cover ham radio antennas (there have been bills
to try to
Note, I intended to make a similar joke, until I realized Jerry messed
up the setup by actually including the antenna height in his post
(unless he has a very loose definition of approximately). :)
John, AC0ZG
On 6/28/2021 4:33 PM, eda...@aya.yale.edu wrote:
I believe the FAA does need to
Running a full Windows OS under emulation on a Raspberry Pi, just to run
one app is not a very good idea (as Adrian pointed out).
An alternative would be to run QEMU on the Pi, which provides an x86
execution environment, and then try to get the N3FJP software running
under Linux Wine (Wine
Anything above 95% or so requires processes beyond just distillation,
i.e. you are getting into the lab grade region. Prices usually go up
significantly for that.
Of course, in many states you can buy 190 proof Everclear (95% grain
alcohol) at a liquor store. Might be easier to find than lab
Hopefully this is obvious, but make sure you are using the 90-91%
isopropyl alcohol, and not the 70% variety. It can still be hard to get
the 90% variety these days.
73,
John - AC0ZG
On 7/14/2021 4:41 PM, Peter Eijlander (PA0PJE) wrote:
Yes Jerry, isopropyl alcohol does this!
I once cleaned
Proximity effect has nothing to do with the technology of the
transducer, i.e. dynamic, condenser, electret, ribbon, etc.
Proximity effect is due to the type of transducer, i.e. whether it is a
pressure transducer or a pressure gradient transducer or a mix of the
two. That determines the
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