I always sell for a price and state that the buyer pays packing and
shipping charges. I don't recall ever loosing a sale due to those
terms. I use a commercial packing service and can always quote the
packing and shipping charges once the destination is known.
In general I find USPS Priori
DX Engineering has the following:
https://www.dxengineering.com/parts/dxe-8xdb002
73
Bob, K4TAX
On 1/3/2019 1:53 PM, Buck wrote:
Where did you find "quality" cables?
Buck, k4ia
Honor Roll
8BDXCC
EasyWayHamBooks.com
__
Elecraft
at
give trouble. If you cut off the connectors and use Amphenol
connectors you will usually have a 'quality' cable.
73,
Don W3FPR
On 1/3/2019 3:22 PM, Bob McGraw K4TAX wrote:
DX Engineering has the following:
https://www.dxengineering.com/parts/dxe-8xdb002
73
Bob, K4T
Yes it is normal to hear a slight hum when the Mains switch is on. Also
the left side may be slightly warm. When the Mains switch is on, the
low voltage power supply is on. This supply is for the logic and
processing.
See the IMPORTANT section on page 14 of the manual for further detail
ifferent circuits, are in operation.
--mark/ae0mm
‐‐‐ Original Message ‐‐‐
On Friday, January 4, 2019 8:14 AM, John_N1JM wrote:
Thanks Bob. Yes great amp.
73, John N1JM
Bob McGraw - K4TAX wrote
Yes it is normal to hear a slight hum when the Mains switch is on. Also
the left side may
What amp?
With mine I just press TEMP on the front of the amp.
73
Bob, K4TAX
On 1/4/2019 8:40 PM, Jamie WW3S wrote:
I seem to recall there is a way to display the PA temp but cant find the
setting to do that.
__
Elecraft mailin
Yes I use a balanced feed line being the "window" type line. It feeds
a 250 ft wire in the center at 50 feet. I have about 75 ft of feed line
from the center of the antenna then, through the attic eve vent,
supported on some wooden hangers I made and attached to the roof
rafters. Then it
First would seem that something in the antenna system is causing a
problem. I run my KPA500 & KAT500 at 450 to 550 watts out without any
issues. What's the antenna and feed line being used? What bands? Is
the output of the FLEX surging as well?
73
Bob, K4TAX
On 1/6/2019 3:36 PM, fyr
Correct on all points.
That is the reason I gave my feedline type, and length and antenna
length alone with specific balun type and common mode choke type. Any
old ragged combination of chunks of wire and feed line is not assured to
work and is largely the reason many hams shy away from bala
I agree with Jim on this point. I have means to measure current in
each side of the balanced feed line. And I have means to measure the
voltage on each leg and observe the phase difference in each leg. A
dual trace scope with 2 current probes is the basic configuration. If
the currents are
I agree with Jim on this point. I have means to measure current in
each side of the balanced feed line. And I have means to measure the
voltage on each leg and observe the phase difference in each leg. A
dual trace scope with 2 current probes is the basic configuration. If
the currents are
They are a voltage type, 4:1 designed to feed a folded dipole. There are
actually 4 windings, 2 on each coil.
If you want to see the best in balun usage and efficiency, a folded
dipole typically has some 200 to 300 ohms impedance when constructed
from open wire line or like materials. Thus
I use the "window line" for 3 of my antennas. We have less than 125 days/ yr
with precipitation of all types. The "loss wet" is a non issue in my thinking
as I'm sure would be about the same for most folks.
Still with extreme loss, under most conditions, coax will have greater loss.
Bob, K
Regardless of what is added, how it works, or what it does, there will always
be those that like it. And likewise, there will be those that object and won't
like it. It needs to fit the needs of the masses.
I've worked systems both ways. I like it the way it works at present.
73
Bob, K4TAX
I suggest another set of CM-500's. They may last 2 years, 5 years or
10 years before they are headed for the trash. Just look at it as a
consumable item and that is just the cost of ownership.
73
Bob, K4TAX
On 1/8/2019 9:00 PM, James Bennett via Elecraft wrote:
Sad to say, but my trusty
I have and use the Koss SB-40. I get great audio reports.
Yes, I agree, if the mike is not positioned correctly and the TX EQ not
set correctly, it can sound bad. So can any other mike where good mike
technique and application is not correctly used.
73
Bob, K4TAX
On 1/8/2019 11:51 PM, W
With regard to "constantly plugged/unplugged", I leave mine plugged in
the rear of my K3S all of the time. I use the PF2 function configured
to switch between SPKR on/off and Headphones and switch the mike from
the front to the rear being the boom mike on the headphones. No
adapters requ
Normal for most radios due to carrier frequency and receiver offset for CW.
Elecraft is not the only that does it this way.
As filters with reduced bandwidth we find that group delay increases. With this
CW wave shapes become a difficult task. Wider filters are much easier to
generate good q
I've attempted to configure MMTTY to run FSK with my K3S. Conclusion is that a
Terminal unit will be required. Using AFSK is easy and I don't find any
disadvantages. No additional hardware required.
Bob, K4TAX
Sent from my iPhone
> On Jan 10, 2019, at 4:57 PM, Nr4c wrote:
>
> None that
I'd say it is called and "updated K3". The K3S is different and my
understanding is that a K3 can not be updated to be a K3S. All abet
similar, in the end, they are different radios. For that fact alone,
the reason I purchased a K3S and not a K3
73
Bob, K4TAX
__
Clarification:
The Tentec Omni VI Plus is not the same as the Tentec Omni VI, opt 3.
There is a difference, in model number and performance and features.
Thus from my take, a K3 upgrade is just that, a K3 that has the
recommended factory upgrades installed. And a K3S is a K3S that can
on
I occasionally see a wee bit of overshoot as seen on my KPA500. I'm
driving it from my K3S at about 20 watts for about 400 watts out on
SSB. Occasionally I'll see a 450 or 500 watt indication on the LED
bargraph. The KPA500 doesn't seem to mind.
If I set the drive power to 20 watts CW mode,
Been there, done that. Too smart and too old to do it again. Buying is
better. Operating what one has purchased is more fun. Better yet,
learning to operate what one has purchased is very gratifying.
73
Bob, K4TAX
K3S, P3, KPA500, KAT500
On 1/11/2019 6:42 PM, Bill Frantz wrote:
Real hams
Use external audio processing, otherwise a compressor or limiter, with
variable attack and release and threshold and ratio controls. Then
follow that with a small power amp to drive an external speaker.
Frankly, I doubt you'd like the results.
I find it better to not use the NR feature d
If you can run 200 watts PEP with the TR7, why run a 500 watt amp?
Otherwise, you'll need a 10dB attenuator between the TR7 and the
KPA500. Hence turn 180 watts of RF from the TR7 into heat as it takes
only about 20 watts to drive the KPA500 to rated output.
73
Bob, K4TAX
On 1/12/2019
To answer the question "Could a couple of inches or so difference in the
length of the legs of a dipole ever work in your favor?"..depends on
the frequency. For lower frequencies likely NO, for higher frequencies
maybe YES. Thus 2" for a 160M dipole would be 0.066% while 2" for a 10M
dipo
That's why I use the statement "xxx ft center fed wire with balanced feed". I
do have the ability to measure the current in each side of the feedline. As
long as it is within 5%, about the limits of accuracy of measurements, I'm
happy.
Bob, K4TAX
Sent from my iPhone
> On Jan 13, 2019, at
Al:
Al et al;
I do agree. And in fact my 250 ft center fed antenna with 75 ft of
window feedline terminates at the operating position into a Balun
Designs 1171T. Then a coax jumper of about 2 ft long, which is actually
a model 8232 from The Wireman, Common Mode Choke between the balun and
And for this reason I choose to use SPLIT in CW mode as opposed to RIT.
Thus SPOT only affects the received signal frequency which is VFO A and
I can tune VFO A as needed just like RIT. Thus VFO B is always the
transmit frequency and is not affected by the SPOT function.
73
Bob, K4TAX
On 1/
Just be glad they don't use TOTSU screws typical of many Japanese
products. i.e the dot and slot ones. Find one of those
screwdrivers at Harbor Freight.
73
Bob, K4TAX
On 1/15/2019 11:04 AM, Arthur Nienhouse wrote:
*/Don
Good advice on shinny Phillips drivers.
Are the screws in the
I see no need for isolation transformers with headphones. Likely the
transformers is the reason the HP output won't drive a pair of
headphones. Isolation transformers? Are they 3 winding hybrid
transformers? I've used them in professional audio installations but
they are rare and expensi
I agree but in the case of using two radios, two pair of headphones, a
switching system and getting hum indicates a serious deficiency in the
station interconnection and ground scheme. Everything should be at the
same potential, thus no current would flow. As they say "sum-tin not
right".
7
Perhaps someone will come up with petite or very tiny jumper cables.
That might solve the Low Battery issue. Maybe a "jumper cable kit".
:-)
73
Bob, K4TAX
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinf
I have experienced issues where a computer and the application software
left fragments of data in the radio. Not specific to the KX2 but could
be. From your description it seems the radio was in FSK mode. That
performs as you described which is a function of APF.
I have found in most cases
I have a whole house surge protector installed at the Mains breaker
panel. Thus I find no need to have individual surge protection for any
of the equipment locations in the QTH. This takes care of microwave,
range, furnace, washer, radios, TV's, entertainment systems, phone
system and such.
If lightning is the item of concern, there's bigger fish to fry in that
regard. Lightning protection is an entire other story and a very
specific approach to lightning mitigation. I use the word
"mitigation" to emphasize the point that all efforts for lightning
protection is an effort to "
craft-boun...@mailman.qth.net On
Behalf Of Bob McGraw K4TAX
Sent: Friday, January 18, 2019 10:30 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA500 external mains switch
I have a whole house surge protector installed at the Mains breaker panel.
Thus I find no need to have individual
There is a Freq Cal mode in WSJT-X. I suggest if the radio or sound
card is in question, run this mode and determine the results. Bet
you'll be surprised at the inaccuracy of the digital readout on a radio
and or soundcard. I was!
73
Bob, K4TAX
On 1/18/2019 3:23 PM, Don Wilhelm wrote:
One easy method is place the radio on the CW mode. Time to one of the WWV
frequencies. Press the SPOT to activate the function. Any difference between
the WWV frequency and the readout is the error.
Bob, K4TAX
Sent from my iPhone
> On Jan 18, 2019, at 4:42 PM, Mike Harris via Elecraft
> wr
Using matching transformers and my spectrum analyzer with tracking
generator, I measured a 100 ft length dry and I measured it wet. My
measurements indicated the velocity factor changed when wet, i.e. the
electrical length of the line changed. Thus explains to me the reason
to "retune" when
Are you saying the K3S does not go into the transmit mode, or are you
saying there is no audio?
From the K3S CONFIG menu you should have RS232 set to USB. The K3S
Menu should have MIC SEL set to Line IN. Is anything plugged into the
Line In on the back of the radio? Unplug it if so. The r
I didn't measure significant increase in loss with clean water i.e. tap
water sprayed on the entire length of the line from a hose. I did make
a solution of dish washing detergent and water and , using a spray
bottle, sprayed that on the line. This caused much more water to cling
to the line.
blems setting up CAT for their radios give this a try and see how
> well it works. And BTW: I do use FT8 fairly regularly as well as RTTY and
> PSK31.
>
> 73,
> Barry
> K3NDM
>
> -- Original Message --
> From: "Bob McGraw K4TAX"
> To: elecraft
Yes CAT can be somewhat confusing IFyou are running multiple
applications at the same time. Otherwise, I use CAT for: WSJT-X,
FLDIGI, HRD/DM780, MMTTY and have zero issues with any of the
applications or levels or commands. And all were easy to configure and
are reliable. When I lo
This type of discussion makes me wonder if folks are feeding audio
direct from the computer to the Line IN on the rear or to the MIC
input. If they are using an external soundcard, i.e. Signalink or such,
then I can understand Windows sounds being heard. Not good.
If they are using the USB m
So what happens if you don't run Win4K3Suite? I run WSJT-X and nothing
else and have NO issues with audio, control, or Windows sound. I find
that WSJT-X handles everything that is needed, radio control, audio
control, and logging.
Conclusion: More software applications running = more issue
This all works with Windows 10 Pro. I've not used the Home edition.
73
Bob, K4TAX
On 1/20/2019 6:14 AM, Andy Durbin wrote:
"Hope you check your windows setting, you might be surprised."
No surprises here. I have never had my rig CODEC as the default sound playback device.
I don't have W
Another trick which works well. Tune to a WWV frequency in CW mode.
Press SPOT and the radio will jump on the exact carrier frequency. The
SPOT function can pull on to the WWV frequency as far away as about 100
Hz. Once the radio has resolved SPOT, the readout / display is the
frequency
I've never had a drift issue with any of my modern transceivers on 28MHz as the
IF. Now the TCXO drift in the transverters is real issue.
Bob, K4TAX
Sent from my iPhone
> On Jan 23, 2019, at 7:08 PM, ab2tc wrote:
>
> Hi,
>
> It doesn't "compound". A 10Hz drift at the antenna output of the
My station is a K3S, KPA500, KAT500. The antenna is a 250 ft center
fed wire with 450 window line that runs from the feed point on the
antenna all the way to the operating position where the 450 line
terminates into a 1:1 current balun on the shelf just above the amp and
tuner. I use a comm
There is NOTHING like getting automatically an answer from the company
and the person that designed the ampon a Saturday morning!
Thanks Jack.
73
Bob, K4TAX
On 1/26/2019 10:56 AM, Jack Brindle via Elecraft wrote:
Ah, but you came to the right place to get an Elecraft answer!
Us
Sure sounds like an antenna problem. Check the system on a dummy load.
73
Bob, K4TAX
On 1/27/2019 7:10 AM, Jack Satterfield wrote:
After 5 years of perfect operation, now a very strange issue
Bypass SWR 3 or 4:1
KAT500 tunes to 1.3:1
Switch amp to operate, operating SBB on first voice K
I recall that it is Electrect. Should plug in direct on the back panel
of the radio. Just turn on the BIAS.
73
Bob, K4TAX
On 1/28/2019 1:26 PM, Paul Ecker wrote:
Does anyone know if the CM500 has a Electret or Dynamic mic?
73
Paul
w2eck
_
Just goes to show, one can't believe what they read on the internet.
73
Bob, K4TAX
On 1/28/2019 1:52 PM, Walter Underwood wrote:
The published docs on the CM500 are a mess, but it is an electret. It even
comes with a battery pack so you can use it with non-powered mic jacks.
wunder
K6WRU
Yes I always find it interesting they include a battery pak but say it's
dynamic. Most all of the descriptions I've seen indicate it is a dynamic
mike. No it's an Electrect element.
Bob, K4TAX
Sent from my iPhone
> On Jan 28, 2019, at 4:07 PM, Mike - W5JR wrote:
>
> That explains where
Yes but..when one looks at the SPECS one will see "Microphone
Type: Dynamic". I guess one could consider that to be "electric".
73
Bob, K4TAX
On 1/28/2019 8:19 PM, j...@kk9a.com wrote:
The manufacture says it is a sensitive electric microphone:
https://usa.yamaha.com/products/musi
The tuner will memorize the antenna selection and matching elements
every time it tunes.
As to the Utility, what ever you change in the Utility will be be sent
to the tuner when Memorize is selected. Not it is not necessary to
hit Memorize every time the tuner resolves a match.
73
Bob,
That is normal to comply with the 60M frequency and BW allowed.
73
Bob, K4TAX
Sent from my iPhone
> On Jan 31, 2019, at 5:15 PM, Bob wrote:
>
> I've been using my K3 & K3s for years using the DATA mode. It has worked
> as if it were in the USB mode, and shows on the P3 scope to the right of
Yes and as Jim wrote, band allocations vary from one country to
another. For this reason the 60M frequencies are not included in the
standard FREQUENCY Table in WSJT-X. Therefore, one must manually enter
the frequencies in the Frequency table. Just right click anywhere in
the table and a se
Thanks and always glad to assist. And glad you have the issue resolved.
73
Bob, K4TAX
On 2/1/2019 9:22 AM, Bob wrote:
Both Bob K4TAX and Bill NR4C figured out the problem...
I've been using my K3s for a few years on all bands except 60 meters. So my
original setup was from a long time ago.
I've seen consistently that the 6M TUNE power on my K3S, s/n 10163
defaults to 16 watts. I have set the TUNE power at 20 watts and it
performs correctly on all bands except 6M. I've completed the TX Power
Calibration with the K3 Utility. All looks good there. I have PWR
Per Band set suc
Thanks guys for the verification on your radios.
I've tried it with TUNE power at different values, 5W, 10W, 20W, &
30W. In all cases, the value for other bands is as selected, except
for 6M where it is always 70% of the selected TUNE power. With this, I
figure it is a firmware issue.
St
Don't forget about the length of the ground conductor as well. I've seen
and found more than one instance where the ground conductor was a 1/4
wavelength on the band which caused RFI in the station. That puts the
station at 1/4 wave or a maximum voltage point above ground. It was
acting like
I all that a PICNIC. "Problem In Chair Not In Computer".
Bob, K4TAX
Sent from my iPhone
> On Feb 4, 2019, at 11:12 AM, Petr, OK1RP/M0SIS wrote:
>
> "Heard ZL4AS yesterday using FT8 between 0815 and 0825."
>
> ...so you did not heard him just your PC decoded it, right?
>
> Do not want to
I've always said "new only guarantees newnot necessarily good".
That's one reason why companies supply a warranty with a new product.
They expect some failures and some to be dead out of the box.
73
Bob, K4TAX
On 2/7/2019 6:41 PM, Jim KO5V wrote:
Don,
It is all working again!
The
The Yahama C-500 and the Koss SB-40 are two good ones. Not expensive
but comfortable and good sounding for both the mike and the earphones.
Either works very well with the K3S. I know, I have all of them. My
preference is the Koss SB-40 over the Yamaha C-500.
73
Bob, K4TAX
On 2/9/201
-16 dB and 400 Hz about -3 dB to -6 dB. You'll
sound like Don Pardo...assuming you have the pipes.
73
Bob, K4TAX
On 2/9/2019 6:48 PM, Walter Underwood wrote:
On Feb 9, 2019, at 1:57 PM, Bob McGraw K4TAX wrote:
The Yahama C-500 and the Koss SB-40 are two good ones. Not expensive but
The point a bit confusing to me was the expression "boom mic set". Is
the requirement for a mike boom and a mike with a cable? Or is the
requirement for a headset, which I take to be headphones with a mike on
attached boom?
I've one of these desk booms I've used very satisfactorily support
Best advice.down load the K3S manual from the Elecraft
website. You'll need to read it 3 or 4 times before you get the
radio. It has info about all the connections, front panel and rear
panel. And will familiarize you with the menus and controls. It is
easy to understand and onl
What ever happened to the idea of making ones own mike cables? Two
connectors, plus a length of 2 conductor shielded cable and a bit of
careful soldering, specially on the Foster plug. Just use a good
quality XLR connector such as Cannon or Neutrik. It isn't "rocket
science" and it is much
I'd be interested in the IMD figures with this configuration.
Are the amps being driven hard wire / parallel at the inputs or from a
power divider? And how are the outputs summed? Power divider? How
much loss is in the output summing network? And is it broadband 160M -
6M?
Another tho
I installed a solar panel and required charge controller in our RV.
While it works quite well for its purpose, when I use the HF radio the
thing must be turned off. Seems those switching charge controllers in
their plastic boxes and with multiple wires running everywhere do
generate noise
I'd start by opening the box and check the input and output of the
regulator, U4, being a LM7805. Should have ~12V on the input and 5V on
the output. If there is not 12V on the input then check both sides of
the diode, D8, which is in series with the 12V input. Also there is an
inductor/cho
I called Elecraft and ask if they would send the schematics for my
KAT500 and my KPA500. In about 30 minutes they were in my e-mail in
box. Very high quality printouts now reside in my manuals.
73
Bob, K4TAX
On 2/14/2019 11:03 AM, Tony Brock-Fisher via Elecraft wrote:
On 2/14/2019 9:38
>From experience I find the units from R T Systems are 100% reliable. Much more
>so than the office supplies, electronics stores, Walmart and such. Plus if you
>have questions, a phone call allows one to speak with a real person in the
>USA.
Bob, K4TAX
Sent from my iPhone
> On Feb 14, 2019,
Do not trust PL-259 connectors installed only "finger tight". Today many
of those PL-259 connectors "look good" but are really poor quality
connectors. ALWAYS snug the PL-259's with a pair of 4" channel lock
pliers. You'd be amazed how many strange issues will go away.
Not saying this is
This discussion has risen its nasty head earlier. Wes and I exchanged
several private e-mails on the topic. Here is what I've learned:
My purchased new from the factory my K3S -100 in August of 2015. With it
I drove my AL-80B with 60 to 80 watts for some two years. Absolute no
issues of co
Don et al:
That is the best idea! Plus if one has a adequate outside lightning
protection system, properly bonded to the AC mains, and then disconnects
inside where they use a coax switch with gas discharge tubes and a
grounding position, they are negating part of the system protection.
7
Smart man and decisions and the way to do things correctly. Glad to see
this.
73
Bob, K4TAX
On 2/17/2019 9:38 AM, James F. Boehner MD via Elecraft wrote:
I use the Alpha Delta Series. They have SO-239 and "N" connector models, two
position or four position. For the price difference, I a
One of the first things to do is isolate the noise to two sources in
general. (a) inside the house, (b) outside the house.
My approach is to use the 12V battery off of the lawn tractor to power
the transceiver. Use the antenna and band which provides the worst
noise. Then pull the main bre
I use the SPOT feature on my K3S to zero beat the carrier on WWV. This gets
me to +/- 1Hz. If it is more I'm inclined to tweak the reference such that it
is accurate.
As to posting spots, I usually post to the nearest 1 KHz. Thus from
experience, I have little confidence in the display
g Day.
>
> tnx
> Mike / W5JR / GQP N4N
> Alpharetta GA
>
>
>> On Feb 21, 2019, at 5:33 PM, Bob McGraw K4TAX wrote:
>>
>> I use the SPOT feature on my K3S to zero beat the carrier on WWV. This
>> gets me to +/- 1Hz. If it is more I'm inclined
Most of my CW work is on nets. Otherwise, pse QNZ. If one is not on
frequency, one is not heard.
73
Bob, K4TAX
On 2/21/2019 6:54 PM, Jim Brown wrote:
On 2/21/2019 4:04 PM, Bob McGraw K4TAX wrote:
And in a pileup the RX bandwidth is narrower. At 50 Hz BW any 12 to
15 Hz away aren&#
The method I've used to check my K3S, put the radio in CW mode, tune to
each WWV frequency and then press SPOT. The automatic SPOT function
will bring the radio to the WWV frequency +/- 1 Hz. The SPOT function
matches the receiver sidetone offset of the WWV carrier and the audio of
WWV is not
This is a good method. See my article in ARRL QST, September 2015,
TRANSMIT AND RECEIVE ON FREQUENCY. I suggest using software for PSK-31
as the AFC will always lock onto the audio frequency and then show the
actual frequency. It is usually good for 1 Hz resolution.
73
Bob, K4TAX
On 2/
My KPA500 displays the temperature in degrees Centigrade. Just
remember, small numbers cooler, larger numbers hotter. Normal room temp
is about 23 to 25 degrees C. The fan switches on at 50, steps up at 55,
steps up at 60 and steps up at 65.as I recall. The book says
maximum temper
Check the Power Set Per Band setting in the K3 config menu. Should not
be set to NORmal.
73
Bob, K4TAX
On 2/24/2019 2:07 PM, Jim McCook wrote:
One of the features I liked with the K-3/KPA-1500 combo was having
power setting in the K-3 remain at 100w for barefoot or amplifier STBY
position.
I have personally found several instances in power supplies I either own
or have repaired where the green power wire lug is firmly attached by
the bolt and nut. It however was nicely insulated by the paint!.
Visual inspection is the best way to determine if an issue exists. Do
take time
I have and use the same configuration as you describe. Make sure both
VFO A and VFO B are in the same mode. Be sure you are in DATA A
mode. With DATA A mode it is a USB mode as used for FT-8.
The right side of the display on the radio should show SPLIT just above
the VFO B frequency, th
Grant et al;
I can agree that many hams do not understand the application of
"filters" in a radio, specially today with the advancements in DSP
technology. I find today that many many hams rely on "old school
methodology" to justify what they do. They, for the most part, seem to
shy away fr
When I read in the manual where it says "never exceed 40 watts" that
leads me to believe one should not do that. While the protection
circuit is fast and there is a 3 dB attenuator that switches in
automatically, from 100 watts down 3 dB is still over 40 watts. I think
I read here where some
Yes, improperly or incorrectly using ALC with any amp or any
transceiver, for that matter, can and usually does produce distortion
and splatter. Just look at some of the signals on the bands and
observe the ALC overshoot which exists with many radios. And it is
made worse by the addition o
This fellow seems to have a good handle on the ALC issue as it relates
to overshoot in the transceiver.
https://www.w8ji.com/alc_exciter_power_overshoot.htm
Here Tom goes into the discussion of good ALC vs. bad ALC systems.
https://www.w8ji.com/ameritron_alc_adjustment.htm
73
Bob, K4TAX
I just looked at the current values of my K3s using the internal DISP
current and voltage values.
This is how it came from the factory after replacement of the KPA3A rev
E amp on 5/30/2018.
In RX USB mode = 1.6A Vcc = 13.8V Audio volume at minimum.
In TX USB mode no audio, 10 watt PWR s
Correction on the RX USB mode current. Should be 1.06 and NOT 1.6.
.. my oops.
73
Bob, K4TAX
On 3/7/2019 1:03 PM, Bob McGraw K4TAX wrote:
I just looked at the current values of my K3s using the internal DISP
current and voltage values.
This is how it came from the factory after
When one starts tinkering with the bias not only should they look at
current value but also at the IMD products while using a spectrum
analyzer. One can tweak the values of IMD down by having the correct
value of bias for each device. They will all be slightly different.
Just because the de
The Honda EU2200i will handle the KPA500 quite well and provide power
for other items. You should run the generator in the ECO throttle in
the OFF position as CW and SSB will have it trying to keep up with load
changes. And the new ones are rated at 2200 watts max, 1800 watts rated
where as
Bob McGraw K4TAX
wrote:
The Honda EU2200i will handle the KPA500 quite well and provide power
for other items....
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Gary:
Nothing heard on my K3S that is being produced by my KPA500 {s/n 3519}
on 10M and nothing seen on my P3.
I would go back through each step of the assembly process and make sure
all is correct and all hardware is tight. I do see spikes from other
sources on 10M but these are in the
I would emphasize with the K3S and KPA500, if one follows the set-up
EXACTLY as described in the KPA500 manual page 16 & 17, and in the K3S
manual page 29 & 59, all will be well with the EXT ALC engaged.
Anything else will be a PICNIC problem.
I suggest the set-up be done with a 50 ohm res
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