I have to admit. I hate those 2.1mm DC connectors. Most are really not
designed for current over 1-amp, though there are expectgions. I wish
the KX3 had Powerpoles on it instead! I have Powerpoles all over my ham
shack and work bench, and have had no problems. Rather than used those
I would like the W2 wattmeter to be able to display delivered power,
that is, forward power minus reflected power. This would give a more
accurate indication of power going to an antenna when the SWR is not
1:1. For example, if the SWR on the line is about 2.5 and forward power
indicates 1.2
I'm selling my Gamma HPS-1a. It looks great and works great. I have replaced
the Molex DC connector with Powerpoles as shown in the Equipment
Modifications section of my website at www.ad5x.com. Price is $169
shipped/insured US - Paypal, check or MO. If interested, please contact me off
You should be keying the KPA with the REMOTE connector on the TS-2000 where
REMOTE Pin 2 and Pin 4 are the contacts that short together to key the amp. I
normally also ground pin 2, and use Pin 4 as the amp-key output. There is also
a solid-state output (Pin 7 and ground), but this has the
“If you don't want the linear to key, it's easy enough to put the linear in
standby.73, Jim K9YC”
Yes, you can do this if your amp is close by – and you remember to do it when
necessary. I use a couple of different amps and autotuners: The KPA500/KAT500
and an ALS-600/MFJ-998. I leave all
The TUNE button does key the linear. I wish it didn’t.
Phil – AD5X
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Take a look at the transceiver front-end protector in the “Articles” section of
my website at www.ad5x.com. It operates full QSK (I tested it to 80WPM). Works
great.
Phil – AD5X
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I put together some info on this in an article on my website. Here’s the
direct link:
http://www.ad5x.com/images/Presentations/KlineAuxCable.pdf
Phil – AD5X
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I have an AIMuhf (replaced an AIM4170). Both are fabulous instruments. And
the software is extremely user-friendly. You can download the software and run
it in demo mode without the analyzer.
Phil – AD5X
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What tip or tips do you recommend? They have a 4mm chisel, a 5.2mm chisel, and
a conical.
Thanks,
Phil – AD5X
“I use Hakko FX-951 in a production environment. This is an excellent, durable
soldering station. If you haven't used a modern soldering station with fast
thermal recovery, you're in
Take a look at the transceiver front-end protector in the “Articles” section of
my website at www.ad5x.com. Very easy to build, and it is even fully QSK
capable.
Phil – AD5X
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I’ve enjoyed 6-meters since I was introduced to it in high school in the
mid-60s. All I used for many years was a Squalo antenna mounted on my Dad’s
chimney on our house in Maryland. With that and a 1-watt crystal controlled AM
transceiver (Lafayette HA-650), I had a ball working across the
And I’ll add my input. Been using the latest firmware and it has worked
perfectly. Been too busy operating to say much. No false tunes, and the
KAT500 tracking of the K3 is outstanding.
Phil – AD5X
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I’ve had surprisingly good results using a MFJ-935B loop tuner.
Phil – AD5X
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Check out the ARRL antenna tuner reviews. They all have loss measurements at
up to 10:1 SWR for resistive loads. There are two Elecraft ARRL tuner reviews:
KAT100 and KAT500.
Phil – AD5X
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Check out the front-end protector in the “Articles” section of my website at
www.ad5x.com.
Phil – AD5X
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Post:
Here are some cable sources that have all 15 pins connected thru:
Cable Wholesale 1-ft HD15 M/F 10H1-20201NF, 3-ft 10H1-20203NF, 10-ft HD15 M/F
10H1-20210
www.l-com.com 3ft HD15 M/F CGSVGAMF-3, 5ft HD15 M/F CGSVGAMF-5, and 10ft HD15
M/F CGSVGAMF-10
Phil – AD5X
“Yes, BUT -- these are passive networks, and the response of all passive
networks depends upon the source Z and the load Z at each port. I'll bet your
measurements were for 50 ohm sources and 50 ohm loads. Real world antennas
differ widely from 50 ohms even when they are close to resonance on
Hi Keith – Take a look at the measured KAT500 isolation numbers in the “Product
Reviews” section of my website at www.ad5x.com. The isolation varies based on
the ports chosen, and the frequency band. As an example, the isolation on 20
meters has a worst-case value of 36dB between ports 2-3
I haven’t had this problem. However, in addition to Igor’s thoughts on a high
reflected signal, here is another thought. A strong signal (like you can have
in contest environment and/or multi-transmitter/multi-antenna set-up) could be
counted by the KAT500 frequency counter resulting in the
“When I was recently testing some Collins gear, built between 1960 and 1975 for
a local woman who inherited it and wanted to sell it, I noticed that the RF
connections were RCA jacks. The RF output from the transmitter which was rated
160 watts input to the final amplifier was a RCA jack. (The
My wife and I enjoy spending time on Mustang Island, TX near Port Aransas. We
always stay at Mustang Towers, which has 15 floors (and we always get a 15th
floor condo). Nothing like being 150 feet above the beach on the Gulf! This
was my first outing there with the KX3, and I had a ball. I
I’ve had a ball with my KX3 and AlexLoop Walkham, particularly on 20- and
17-meters. Very easy to set-up, and easy to tune with just a little practice.
I have the unedited QST “Short Takes” review in the “Reviews” section of my
website at www.ad5x.com. Included in that review is a simple
I just press TUNE on the K3 when I QSY before operating. This puts out a
lower-powered carrier and the KAT500 selects the right tuning combination.
Phil – AD5X
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Dave WX7G wrote an article that may be of interest:
www.eham.net/articles/21272
I also have some info in the “Presentations” section of my website at
www.ad5x.com.
As Jim says, if you use good quality coax over reasonable distances (I use 1/2”
heliax over a 60-ft run), SWR-related losses are
I use a 4S2P 5200mah LiPo battery with my KX3. It lets me run 10 watts for a
long time. I use the simple reducer in the “Articles” section of my website
(www.ad5x.com) and just remove it when convenient when the KX3-monitored
receive battery voltage drops below 14V. You can expand on this by
I put two 1N5400 diodes in series with each other (these are 3-amp diodes).
The diodes are physically side-by-side, with the leads connected in series to
keep the assembly small. This all fits nicely between two PowerPole connectors
and has a piece of heat-shrink over it. When connected
If you haven’t seen this video, it is worth looking at. Alex has a small
plug-in mic on his KX3.
Phil – AD5X
http://www.youtube.com/watch?v=hoHNoIK_OUo
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I get my cables at Cable Wholesale as well. They even provide pdf’s of the
spec sheets on the cables so you can see what pins are connected.
Phil – AD5X
“The proper all 15 DB15HD Y cables are available for a lot less from:Cable
Wholesale ($4.03):
Here in the US we can order a Mouser 171-7435-EX 4-conductor 3.5mm plug.
Plenty in stock (over 2500). Cost is around $2.50 each plus shipping.
Phil – AD5X
“The KX3 mic input uses a multi barrel jack plug which enables up downchannel
changing using buttons on the hand mic. I an regular
That’s the way it currently works. I.e., when you select AUTO, or MAN or BYP
the KAT500 stays that way on all bands. I train my KAT500 on my three antennas
on all bands, and then leave it in MAN mode after that. Bypass is a tuning
solution when the SWR is low. When in MANual, the KAT500
“With the power output limited to 12 watts, there should be no need to connect
anything to the ALC on your amplifier. That is just not available on the KX3,
nor is it available on any other QRP transceiver that I know about.”
I agree that ALC is unnecessary. But FYI - both the FT-817 and the
Heimbold
Sent: Saturday, January 05, 2013 12:12 PM
To: Phil Debbie Salas
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] [KX3] Solid state amps and KX3 negative ALC
I have been using the KX3 with the THP HL450B and they seem to be getting
along fine. I am currently using the KX3 again
“...How did you measure that? They are very different from my measurements. ..”
I measured the isolation with my Array Solutions VNA2180.
Phil – AD5X
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..Ah, so you measured loss directly from, say, port 1 to port 2 with a VNA
(vector network analyzer)
I should have been clearer. I connected the VNA output to Port2, the VNA input
to the radio port, and I selected Port 1. So isolation measured was Port2 to
common when Port1 was selected.
“...I have noticed that the port-to-port isolation between the 3 antenna ports
is rather poor...”
I measured about 42dB isolation on 6M from port 1-2. And this stays pretty
constant down to 15M and then gets better fast.
I measured about 61dB isolation on 6M from port 1-3. This gets better
If you are an ARRL member, you can access the February 2013 review of the TT418
amplifier at http://www.arrl.org/qst-product-review-and-short-takes-columns
Phil – AD5X
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I also use a Gearmo 4-port USB/serial converter. Got mine from Amazon:
http://www.amazon.com/FT4232HL-Professional-Retention-Certified-Microsoft/dp/B004ETDC8K/ref=sr_1_2?ie=UTF8qid=1355712034sr=8-2keywords=gearmo+usb+to+rs-232
Phil – AD5X
“... Another discussion is about whether to push in the roll pin to lock the
PP connectors side by side.My preference is not to use the roll pins. ...”
I stopped using roll-pins a long time ago. I put a drop of superglue on the
black/red connectors and then slide them together.
Phil – AD5X
I use this USB/RS232 4-port adapter:
http://www.amazon.com/FT4232HL-Professional-Retention-Certified-Microsoft/dp/B004ETDC8K/ref=sr_1_1?ie=UTF8qid=1353285837sr=8-1keywords=usb+rs232+4port
$45 and works great. Since my K3, KPA500 and PowerMaster all use RS232
interfaces, I went ahead and used
“...But there are bugs. Here is the first one I can reproduce 100%”
You need to go into the Utility and set up the preferred antenna (or last used)
for each band.
Phil – AD5X
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The voltage or current can be as bad as the 1:1 voltage or current multiplied
by the square root of SWR – NOT multiplied by directly by SWR. So voltage or
current at a 6:1 SWR could be as bad as about 2.5 times the 1:1 SWR voltage or
current, and at 10:1 SWR a little over three times the 1:1
“I am having difficulties keying my KPA500 from my Yaesu FT897D. It has no
dedicated PA Out jack. The CAT/Linear jack is currently in use transmittingband
data to the RS-232 port on my computer and I had hoped to use the ACCjack to
key the amp.”
The TX GND output on the CAT/Linear jack is
All three ports have gas discharge tubes and static bleed resistors.
Phil – AD5X
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“If you want a headset without a mic, the Sony MDR7506 (pro) or consumer
equivalent work really well with a K3, and with every other ham rig I've
used them with. ..”
I totally agree with Jim. Hard to beat the Sony MDR7506 headphones.
Phil – AD5X
Well - Thought I'd put this out here since it'll be tomorrow before I can
contact Elecraft Support.
This morning my K3 (SN308) started having problems with the front panel
controls. I can't change bands with the BAND button, pressing the MODE
button changes antennas, pressing the MV button
I also went with 3-ft cables for the PR6. I used a couple of these:
www.allelectronics.com/make-a-store/item/CBL-27/3-BNC-BNC-CABLE-RG-58/1.html
Phil - AD5X
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I've had a lot of keys in my 48 years of hamming - and I've kept them all
(they are on display in my living room!). For portable use, I've used a
Palm Paddle for several years. Very nice, light, inexpensive and works very
well. I just replaced it with a Begali Traveller Light. The Begali is
I've looked at several small 2-5 amp switchers for possible use with my KX3
(whenever it arrives). All have been pretty RF noisy. I haven't looked at
the Fry's or Amazon units, but I'm a little suspicious and I'm getting tired
of spending money!! So far, my Gamma HPS-1a seems to be the way
Take a look at the Portable Dipole in the Articles section of my website
at www.ad5x.com. It is the size of a 20-meter dipole, but can provide
resonant 40-10 meter operation. Very compact, cheap, and works well. It
has been my portable antenna-of-choice for several years now.
I also show
The most prevalent anomaly is staying at 5W after using the K3 TUNE
function. It's immediately apparent because I only get about 50W out of
the KPA500 when I put it in OPER, and when I adjust the PWR setting, it
is at 5W. It doesn't happen all the time. The second most prevalent is
when I put
This looks like an interesting battery pack.
www.ebay.com/itm/ws/eBayISAPI.dll?ViewItemitem=170794794136ssPageName=ADME:B:WNAFP:US:1123
Phil - AD5X
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Can anyone tell me what isolation I can expect between KAT500 antenna ports
1-2, 1-3 and 2-3?
Thanks,
Phil - AD5X
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Here's a program that will let you compare toroid vs air core losses:
http://www.dl5swb.de/html/mini_ring_core_calculator.htm
Phil - AD5X
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I just bought a 4-conductor 3.5mm plug from Mouser. Part number 171-7435-EX.
It is a Kobiconn and seems well made. Price is $2.60 and they have over 8,600
in stock!
Phil - AD5X
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Is the KAT500 hefty enough such that the KPA500 can be placed on top of it?
That is the way I'd like to stack/arrange the two in my station.
Phil - AD5X
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The KPA500 draws in air from the top, and exhausts it out the back. So
placing the KAT500 under the amplifier shouldn't affect KPA500 air flow.
Phil - AD5X
I think the KAT500 may be sturdy enough for the KPA500 to sit on top of it,
but I am a bit nervous about interrupting the air flow around
I also got my Samlex 1235M from Radio Dan. Have had it a couple of years.
Works great.
Phil - AD5X
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I have a good handle on my coax cables. I use a MFJ-4726/RC which has
6-inputs and 6-outputs, and can be placed under the bench as the switching
is handled with a small remote control box. But for the rat's nest behind
the radios for all the other interconnects, all I did was label the
Yes - Ameritron tube amps have had the cut the green wire mod and
Ameritron SS amps have had the optional 10/12 meter filter for many years.
Phil - AD5X
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Does it work OK at 100 watts? I had a similar problem several years ago with a
different amplifier. Everything worked well up to about 300-watts, then the
amp would trip out. Turned out to be a bad UHF elbow that arc'd at high power.
Phil - AD5X
Something in the antenna or feedline
That is an untuned vertical. You need an antenna tuner for most bands (the
Zero5 website tells you this). If your new K3 is equipped with the
autotuner, you'll be fine.
Phil - AD5X
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I've been making tuner loss measurements for an upcoming QST review of some
remote autotuners. My set-up is similar to the ARRL lab, but I've made a
few changes. I have two different load boxes. One is a resistive load box
that lets me measure loss with loads from 12-800 ohms. The second
I've had a MFJ-998 autotuner for about 3.5 years now. It works great, and
it is easy to upgrade its software (a new upgrade just became available).
The most power I've put through it is 1200 watts feeding my 43-foot
vertical, though now I'm only using it with my KPA500. I have a review on
my
His signal level into your receiver is pretty close to 0 dBm. Considering
that an S9 signal is -73 dBm, you really have a huge amount of signal
messing things up.
Phil - AD5X
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I bought a 100-ft roll of S-Video cable from www.allelectronics.com, part
number CB-285. Price is $18. This is a black, round cable that includes
two internal shielded cables. This is good stuff - relatively small and
flexible.
Phil - AD5X
Pins 1, 6, 7, and 8 should be missing.
Phil - AD5X
How many pins are missing/ cut off on the AUXBUS cable connected to the
K3/KPA500? Mine is missing 4 pins, is this correct?
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The AL80A is not the most modern of amplifier designs - but it works
well and is paid for. Is there a suggested keying/RF delay (transmit
delay) when using this amp? I never had a rig with adjustable delay before.
Bill W2BLC
The large open-frame relays used in many of the Ameritron amps
I'm passing this along as KD5EVW is having some problems posting to the
reflector.
Phil - AD5X
Original Message Subject: K3 S-Meter Stuck with KXV3 Error
Date: Sat, 28 Jan 2012 15:50:33 -0600
From: Kenny Stephanie kd5evwac...@gmail.com
To: elecraft@mailman.qth.net
I recently
I've been using a MFJ-998 for about four years - first with an ALS600 and
now with the KPA500. The MFJ-998 works very well. It has an amp-disable
feature that opens the amp-key line when SWR goes above a pre-set level, or
when the tuner starts tuning. I modified my MFJ-998 so that it
As the KX1 requires less than 1-amp, you might want to take a look at the
Array Solutions PS-12R1A power supply. This is a linear regulated wall-wart
type power supply, is is RF quiet, and it is only $19.
Phil - AD5X
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Here are the Mouser part numbers:
Ed - Thanks for the info. My Field Test KPA500 (SN12) had gray buttons
around the LCD display and for the operate/standby switch. When I installed
all the hardware updates, I used these in my updated amplifier as I prefer
the gray color and contrast. I'lll
Check that the terminal strip board on the rear panel is not shorted to the
rear panel. There is supposed to be an insulator between the terminal strip
board and the rear panel.
Phil - AD5X
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Sounds like the KPA500 Pin11 inhibit input is low on 6-meters. If you are
using the Elecraft 6-meter preamp and switching it on automatically using
this pin on the K3 accessory port, then you are also disabling the amplifier
on that band. Pin11 needs to stay high.
Phil - AD5X
This sounds strange to me. Why would the tuner care whether it is in a QSK
environment? I run QSK with my K3, KPA500 and MFJ-998 with no problems.
Almost sounds like there is some hot-switching going on that makes the tuner
declare a SWR fault. The tuner should be outside the QSK loop
As I have a 240VAC NEMA 6-20 outlet in my ham shack, I purchased a
plug-and-play C13615P-6 power cord from www.cables.com ($12.00 plus $6.45
shipping). The female end of this power cord plugs directly into the rear AC
input connector on the KPA500. The C13615P-6 NEMA 6-15 plug fits either a
FWIW - I bought #4x1/4 SS black-oxide covered screws from McMaster Carr.
Price is $3.91/100. Part number 96640A054. I use them on my K3 and KPA500.
Phil - AD5X
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The SPE Expert has the standard BCD band data interface as well. You can
just feed the band data outputs of the K3 to the SPE Expert and not even use
the RS232 interface.
Phil - AD5X
Good morning all. I have seen some postings of EXPERT 1k users here on the
reflector, I need
your help. A
Any simple USB to serial converter will do the job ... The only pitfall to
avoid is to find a USB to serial converter based on an FTDI chip as the
Prolific based converters sometimes have driver issues with software written
in certain languages or compiled with certain Microsoft compilers
I currently have a K3/KPA500/MFJ998 set-up. I used a MFJ-994B with an
ALS-600 for several years. A couple of years ago I upgraded to a MFJ-998 as
it has a built-in amp-disable feature when tuning. I do like these
autotuners and I have reviews of both in the Product Review section of my
Too short IMHO. I think it is 3ft or 1 Meter. 6ft or 2 meters would
be better or at least an option for 6ft. Mike W0MU
I agree. The 3-foot AUX cable doesn't work for me. I've added an article
in the Equipment Modifications section of my website at www.ad5x.com
showing what I used for an
The KPA500 will give you 12-13dB gain. So your 15-watt K2 will give youi
200-300 watts out of the KPA500. I use my KPA500 at 190-200 watts output on 30
meters when I need a little extra oomph. I drive it with about 10 watts with
my K3.
Phil - AD5X
I just got an MFJ-998 auto tuner to work with the K3. I'm using the K3
TUNE
function (15 watts) to trigger the auto tune function on the MFJ-998.
Generally, it works fine. However, if I try to tune up to a very
non-resonant band on my antennas where the SWR is very high, the K3 reduces
the
Just curious if anyone else is using the K3 internal tuner with a 43'
vertical. Will handle all the bands 10 - 160? Or do I need to purchase
an external tuner. I'm about to put one up to get me on the air. This
will be a temporary antenna while I build the antenna farm here at the
new qth.
The spring under the amp-end of the fuses sort of pushes the fuse ends out a
bit. I simply squeezed the fuses as I pushed the assembly in place. It did
resist, but then snapped in place.
Phil - AD5X
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I have a K3. However, there is really no difference for any transceiver. If
you use ALC, just follow the instructions in the KPA500 manual. It is very
well documented.
The MFJ-998 auto-tuner works well for me.
Phil - AD5X
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A Hamstick is a pretty narrow-band antenna and really needs to be set-up
with an SWR analyzer, otherwise you can have a hard time finding where it is
resonant. You don't have to be far off resonance (especially below 20
meters) for the SWR to be very high.
Also - check connectivity from the
I would think the KAT500 will behave similar to the KAT3 (or the K2
equivalent the KAT100). So the answer would be YES.
The tuning is remember per band (band segment) and per antenna connector.
On any one band, if you change the antenna associated with a particular
connector, then the tuning will
I occasionally saw this problem in earlier KPA firmware. It seemed
intermittant and I was unsure if it was me or the firmware that was causing
this - sounds like it was the firmware. I'm currently testing the latest
1.11 and don't see the problem at all. Be patient - I think the latest
The Nintendo 3DS zippered hard carrying case (got mine from Target for
$12.99) is perfect for the XG3. It has an internal pocket for the
programming cable, and a nice area for the XG3 (includes an elestic strap to
hold it in place). Looks like it was made for the XG3!!
Phil - AD5X
The FT-897 has an extra TX GND signal on the tip of the ACC jack.
A cable with stereo 3.5mm plug to RCA plug can be used to connect
the ACC jack to the KPA PA Key jack ... an off the shelf 3.5mm stereo
to 2 x RCA cable can be used for ALC and PA Key if desired.
That ACC jack tip is for an INPUT
: Joe Subich, W4TV li...@subich.com
To: Phil Debbie Salas dpsa...@tx.rr.com
Cc: elecraft@mailman.qth.net
Sent: Wednesday, August 10, 2011 7:42 AM
Subject: Re: [Elecraft] KPA500 cables needed
That ACC jack tip is for an INPUT to the FT-857/897. I.e., grounding
this input puts the radio into a CW
So I have an interesting issue. I can talk to my XG3 with an FTDI
USB/serial adapter. But I can't talk to it with my old KUSB serial adapter
(which I still use with my K3). The old KUSB is a Prolific device. I did
verify I have the latest drivers. Not that big a deal, but wondered if
I have one question at this point--when I switch my K3 to 30 meters the amp
recognizes that fact, and displays that band. However, there is no
indication that the amp works on 30 meters, and there is not an optional
band switch for 30 meters--probably, at a minimum, because that band is
limited
...I and others have had issues with a 706 on 15 or 17 and I don't remember
which.
I had a weird swr issue and maybe self oscillation on 15...
There was an instability problem with the IC-706MKIIG on 15 and 17 meters.
Icom published a service bulletin on this (Bulletin 928). It has to do with
The other thing that seems to be missing. The K3 ought to be switching
the antenna switchbox, not the computer or some other device. The reason is
obvious, the proper antenna will always be connected quickly. The same
cannot be said for other approaches.
Take a look at the Ameritron RCS-12C
Here's one I use:
http://bwrc.eecs.berkeley.edu/Research/RF/projects/60GHz/matching/ImpMatch.html
Phil - AD5X
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Wayne - I originally bought a CUP36 a number of years ago to use with my
FT-817. You DO have to purchase an AC cord (it doesn't come with one) - and
it is a 2-pin power cord. I found that the CUP36 was very RF noisy -
particularly from 160-40 meters. I wound up buying a MFJ-4103 which I
The plan for Pin 11 (I understand) is to eventually inhibit the KPA500 when
pressing TUNE on the K3 so that you can tune a manal or auto-tuner at low power
without having to remember to manually put the KPA500 in standby first. My
understanding is that this will be in a future K3 firmware
A good cable is the 6-foot SVGA M/F cable from www.cablewholesale.com, part
number 10H1-01206. All 15 pins are connected through, no pins are shorted
together, and there is a foil shield with drain wire - and the cable is only
$3.25. Here is the spec sheet on that cable:
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