ltage zero crossing, it makes no noise at all.
>
> Chuck
> KE9UW
>
> Sent from my iPhone, cjack
>
>> On Jun 27, 2018, at 2:10 PM, Bob McGraw K4TAX wrote:
>>
>> Seems that the AC line supplying the equipment has a rather high impedance
>> thus allo
Golly, I'm trying my best to figure out something important to worry about.
Bob, K4TAX
Sent from my iPhone
> On Jun 27, 2018, at 2:35 PM, hawley, charles j jr
> wrote:
>
> Wouldn’t it be out of proportion to it’s height to have 3/8 inch feet? 😝
>
> Chuck
> KE9UW
>
> Sent from my iPhone, c
f-lived when it occurs, and it's new.
>
> To me, guessing, it sounds like something connected to the main AC feed is
> coming up out of phase, then finally syncing, after which the hum stops.
>
> A neighbor's solar array? I have no idea as of this point.
>
> 73 Chris
Would not K3S' be the plural of K3S?
Bob, K4TAX
Sent from my iPhone
On Jun 27, 2018, at 4:44 PM, Ian White wrote:
>> A big reduction in receiver noise floor and a huge improvement in
> both
>> transmit and receive phase noise.
>
> That is far too simplistic. Anyone's personal definition of
No issues here with the K3S and WSJT-X in Hound mode. I do use CAT
control for PTT and not VOX. SPLIT works just fine with no observed
delays. It may be enhanced by the fact that I'm not running any other
applications, logging or such while working FT-8. Logging is handled
separately by a d
If it power hunts, this is a clear indication that the audio level is
not correct. Be sure to set the level such that you have 4 bars solid
on the ALC meter and the 5th bar flickering. Now, with that said, this
is not ALC, but is audio level. For others to advise you and even the
instructio
With that combination which I have, I suggest setting the CMP to a value
of 15 to 17 so as to produce about 3 to 4 bars on the CMP scale. Also,
you will need to adjust the MIC gain value such that you get 4 to 5 bars
on the ALC scale.
Yes, mike-to-mouth position is critical. I'm not familiar
I've found the USB and CODEC drivers in Windows 10 Pro {latest update}
to be quite stable and reliable. I have 2 physical USB ports on this HP
laptop computer which I use for my radio applications. The 3rd USB
port is always used for my wireless mouse. I can use either one with
the K3S and
Yes, download the manual from the Elecraft site ..print it out
and read it, cover to cover, and word for word, at least twice.
It is amazing how much info is covered in the manual and available to
all hams.
73
Bob, K4TAX
On 7/1/2018 1:41 PM, J Chester wrote:
Hello list,
I am r
Don't recall what band(s) you are working but.I find it amazing
on the lower frequencies to add in 10 to 15 dB of attenuation and reduce
the RF gain a bit provided marked improvement in the ability to pull
weak signals out of the noise.
The idea advanced to me by others in the know is
I suggest to one other to visit the local auto window tint place. Get
a scrap of light green window tint, cut it to size and put it on the
plastic overlay for the display. Or if you know someone in the
performance theater circles, get a piece of light gel which they use on
spots. Easy to
I agree as I like to check antennas before operating. Less smoke comes out of
the boxes that way.
Bob, K4TAX
Sent from my iPhone
> On Jul 2, 2018, at 9:40 AM, Wes Stewart wrote:
>
> If it's like a KPA500, you can have it go to Operate when powered on. Menu
> "PWR ON = OPER"
>
> Caveat,
At 07:57 AM 7/2/2018, Bob McGraw K4TAX wrote:
>I agree as I like to check antennas before operating. Less smoke
>comes out of the boxes that way.
>
>Bob, K4TAX
>
>
>Sent from my iPhone
>
> > On Jul 2, 2018, at 9:40 AM, Wes Stewa
In running my KPA500 on FT-8 mode at about 400 watts output, what is the
recommended setting for Fan CTL? I usually keep it in NORmal but have
tried other settings. I watch the TEMP and see that it gets above
65ºC. The fan speed increments up and down as the temperature changes
accordin
From my take and experience comparing the K3S and the IC-7300:
(A) Both are ham radios.
(B)
(C)
End of comparison.
73
Bob, K4TAX
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman
Licensed in 1958, through the years and even today, I operate AFSK, PSK, JT-65,
FT-8, CW, SSB, and AM. Each mode has its enjoyable culture and its upside and
downside. That's ham radio. If one doesn't like it.don't operate it, but
don't chastise those that do.
"If one doesn't have someth
My shop is about 300 ft from our house. In a corner of my 25' x 50'
building {not a garage}, I have enclosed a 12' x 15' area, where I
insulated the walls and ceiling. This is my radio room which has my
test bench and equipment from a former service repair business.
investment. Du
One doesn't need a window. Use a saws-all, cut the correct size based on the
AC, frame it in on the outside and inside. Place and secure the AC in the
finished hole.
Bob, K4TAX
Sent from my iPhone
> On Jul 5, 2018, at 11:00 AM, Dale Chayes wrote:
>
>
>> On Jul 5, 2018, at 11:49 , W2xj wr
Although there are several DXpedition cards on my wall, this was really
my first somewhat serious attempt at working a DXpedition. The antenna;
a 256 ft center fed wire as an inverted V at 50 ft, with a balanced feed
line all the way from the feed point to the operating desk where it
terminates
Operator mike technique is very important with regard to good to great audio.
I've found that my $20 Behringer 8500 sounds as good as my $100 Shure SM 58.
Likewise my $200 Heil PR 781 needs for one to pay special attention to
mike-to-mouth distance in order to control proximity effect.
Pric
Two tuners...wow, lucky to have any RF into the antenna.
My K3S and its internal ATU will tune the 160M inverted V{256 ft} with
balanced feedline quite easily. The SWR on the 18" of coax between the
1:1 current balun and the radio is 1.75:1. The drawback to the 160M
antenna...it i
I would also suggest using three - #10 with ground as the line from the
breakers to the amp operating position.
73
Bob, K4TAX
On 7/9/2018 11:43 AM, Roy Koeppe wrote:
Yes, that is what I am using.
73, Roy K6XK
I probably missed this but my google searches aren't working either.
Wil
conduit. If installed in conduit, it must be derated. When you put
Romex inside conduit the Romex cannot breathe and retains too much heat.
Hence the reason for derating.
73
Bob, K4TAX
On 7/9/2018 7:40 PM, Jim Brown wrote:
On 7/9/2018 12:26 PM, Bob McGraw K4TAX wrote:
I would also suggest using
All this doesn't speak well for the quality of the dummy load or coax jumpers.
Bob, K4TAX
Sent from my iPhone
> On Jul 9, 2018, at 10:01 PM, Phil Kane wrote:
>
>> On 7/9/2018 7:12 PM, K8TE wrote:
>>
>> BTW, I have made a 75m QSO on a dummy load. I think I was using Radio Shack
>> coax back
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown
Sent: Monday, July 09, 2018 8:40 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Breakers for KPA1500?
On 7/9/2018 12:26 PM, Bob McGraw K4TAX wrote:
I would also
Per the manual 50% efficiency. So at 1500 watts output the. input would be abt
3Kw. A 20 amp ckt at 240 V would supply 4.8 Kw. Seems reasonable to have
adequate power for other equipment.
Bob, K4TAX
Sent from my iPhone
> On Jul 10, 2018, at 12:34 PM, "j...@kk9a.com" wrote:
>
> I based tha
Have you run a Transmitter Gain Calibration from the K3 Utility
Application? If you do, be sure to use a good dummy load connected
direct to the radio with a known good short coax jumper.
The fact you have 3 different power indicating devices which all
indicate different power values, I'd say
From page 9 of the manual: "K3S/100 typ. Suggested max from 51 - 51
MHz, 85 W, 52 - 54 MHz 70 W. " There are other specs related to
K3S/10 and transverter outputs.
Looks like 100 watts is a good number from 50 - 51 MHz. I see that on
my radio and I've not checked power above 51 MHz. T
Mine shows the power output regardless of the PWR setting. It shows a
10 watt full scale range when it is set to 10 watts PWR or less. If I
set the PWR to 20 watts the meter switches to 100 watts full scale and
indicates accordingly. My default TUNE power setting is 25 watts and
the meter
Yes, for low power devices, meter lamps in tuners and power meters,
etc., I use a power distribution strip I made specifically for that
purpose. It is supplied from the stations main supply. No wall warts
at my QTH.
The output connectors are a few chassis mount RCA connectors, a couple
of
John et al:
I did a similar thing using a formerly Radio Shack project box. i.e.
plastic box with a metal cover. Added 3 RCA connectors, 3 1/8"
Tip-sleeve jacks, and a couple of PowerPole connectors and a 4 position
140 Cinch power strip. Out of the box I have a pigtail of #14 stranded
wir
Ok. Try K4TAX on April 15th .and that is not a vanity call. Just a good
old FCC issue in 1959.
73
Bob, K4TAX
Sent from my iPhone
> On Jul 13, 2018, at 4:34 PM, Wayne Burdick wrote:
>
> A certain amount amount of uplifting, meta-level, or otherwise tangentially
> related subject matte
Hence the reason for 3AC fuses. They have a ceramic body and don't explode.
Of course the only way to tell if they are open is to measure them.
Bob, K4TAX
Sent from my iPhone
> On Jul 15, 2018, at 10:18 AM, K9MA wrote:
>
> Also, fuses rated 250 V AC are typically rated only 32 V DC. That
I always follow the manual. What someone said is "hear say" in court.
For both 115V and 230V operation 3AG fast blow fuses are specified. For
115V those would be 12 amp fuses. For 230V those would be 6 amp fuses.
And they should be rated at 250 volts.
Just be sure the Mains Voltage Settin
See page 14, paragraph 2 under Operation. "...you may hear audible
clicking sounds as the amplifier components cool. This is normal."
Mine does, depending on the operating conditions. I see TEMP values
about 60º C during heavy FT-8 operation at 450 watts. The fan
increments to #3 d
Yes, you will need a Y cable, connect to RX ANT IN and OUT. The junction
of the Y goes to the SDR Play. To activate, press the RX ANT on the
radio. This sends the ANT 1 or ANT 2 signal to the Out and then back to
the In via the Y cable, while feeding same to the SDR play.
Works great. I use
My measurements indicate the SDR Play input Z is well above 50 ohms and no
degration in signal strength was noted.
Bob, K4TAX
Sent from my iPhone
> On Jul 17, 2018, at 9:16 AM, Joe Subich, W4TV wrote:
>
>
> You will need a (hybrid) splitter ... connect the common port of
> the splitter to
No, FT-8 is a weak signal mode. That is not the same as a low power mode.
Bob, K4TAX
Sent from my iPhone
> On Jul 17, 2018, at 9:15 AM, turnbull wrote:
>
> I thought FT8 was a low power mode. Am I wrong? I am not referring to Fox
> Hound mode.
> 73 DOUG EI2CN
>
>
> Sent from my Samsu
Thanks Jim, K9YC, for the detailed information. I too concur that wide
signals can more likely be the result of the waterfall adjustments, or
the system gain, which has the no signal noise level above 30 dB on the
WSJT-X bargraph indicator. If this is the case, adjust the audio level
in the W
Same procedure in TN. Call plate obtained with amateur license at regular
price.
Bob, K4TAX
Sent from my iPhone
> On Jul 17, 2018, at 7:47 PM, Phil Hystad via Elecraft
> wrote:
>
> Ditto for Washington State — copy of FCC license required to get call sign
> plate. But, at least in WA sta
Well that condition of a power failure is never advised. Likely the
radio just won't save the last parameters. And yes it is never advised
to turn off the power supply before turning off the radio. The radio
saves the last used parameters when the power switch is depressed.
This won't
Is the WSJT-X application setting in the F2 menu under Radio set for
MODE = Data/Pkt and that the Split Operation set to RIG? This keeps the
transmit tones correct within the passband of the SSB filter. Here in
this application SPLIT is not the same principle as split when working
DX. SPLIT u
Yep, mine sounds about the same. And I too run the fan on #2 when
working FT-8. Otherwise, I set it to normal and it cycles on and off as
needed. The clicks and pops are considered "normal" as per the KPA-500
manual and also a friend that was instrumental in me making my
purchase. Fact o
All of these "relative" recordings have little to no value in terms of
"how loud" the noise may be. Yes, it is there. Amplify it enough and
it will blow the side of the house out. The phone on top of the amp is
certainly not where ones ear may reside.
If one wishes to cite how loud a sound
Why not use a 7812 three terminal regulator? It will accept up to 30 V
on the input, deliver 12 V on the output at 1.5 amps. These cost about
$1.50 or less. If one needs more current then add a 2N3055H as a pass
transistor for up to 5 amps of current.
Another choice is a regular AC 120V p
Well I really don't have an issue with mine but I did search and learn
about using a Sorbothane damper. Interesting stuff and related
applications.
73
Bob, K4TAX
On 7/19/2018 9:01 AM, Clay Autery wrote:
Y'all are making me want to find a unit with this "issue" now just so
I can solve the
How are you handling the PTT? Direct from the KPA-500 to the TS-2000
via the PA Key on the amp or by the KPA-500 Aux connector pin #10.
Check cables as one of those commands is being dropped.
Add a ferrite choke on the PTT line if using the PA Key command
method. Or, reduce drive power
One option in my thinking is to use the coax switch on the input of the
KPA1500. Then one can switch between the K3 and K2/100 and not need a
high power switch. The KPA1500 in standby is then in bypass mode and
one doesn't have concerns about switching high power.
Oh what the heck do I know.
After much investigation and consideration I elected to purchase the
KPA-500/F. Since I have the K3S and now the KAT-500, I've "trained"
the KAT-500 for the antennas and frequencies on each band. With the VFO
tracking, I dial the frequency and everything follows.
Specifically the KPA-500 I
As I recall, there were some original issues with the connector pins
associated with the KPA-3 PA amp. I recall these were later changed
to gold plated pins. Your description seems to indicate the KPA-3 100
watt amp is dropping off line, leaving only the 10 watt driver stage on
line.
73
I agree with John on this. Heil is good about warranty and quick
turn-a-round. If one is concerned about being without a headset, then
I suggest obtaining/buying a CM500 as a spare while the ProSet is away
for repair.
73
Bob, K4TAX
On 7/25/2018 6:06 AM, j...@kk9a.com wrote:
I would con
Here has them available. You can get the parts and build one. Or it should
plug in direct on the back of the K3. That is my choice.
Bob, K4TAX
Sent from my iPhone
> On Jul 25, 2018, at 8:24 AM, Gary Smith wrote:
>
> I have my father's Heil headsets and he
> had an Icom adapter for it. I'
Darn auto correct!!! Heil not here. G!
Bob, K4TAX
Sent from my iPhone
> On Jul 25, 2018, at 8:32 AM, Bob McGraw K4TAX wrote:
>
> Here has them available. You can get the parts and build one. Or it should
> plug in direct on the back of the K3. That is my choice.
>
Might run the K3 at 75 to 100 watts without the KPA500 and see if it
shuts down.
Those temperature numbers, are they the K3 or the KPA500? You might
lift the top of the K3 and remove the KPA3 100 watt amp and observe both
the male and female connectors. Look for any signs of heating or
d
I'm using the SDR Play / RSP1 with HDSDR software. With the RSP1
connected to the IF OUT I find that nothing else is required.
Configured in the software, via OmniRig for Sync to Rig and Sync from
Rig, I have full point and click mouse control. Click on a signal and
the radio goes there.
Yes, the K3S SWR display can show a 1.0:1 value. But in my case, it
does not exactly agree with another instrument in the feed line system.
As to why you are showing two different values, as minute as they
are I might add, you are measuring 2 different places in the feed line.
In my thi
I run my amp on 240 VAC with the yellow tap as supplied from the
factory. No hum or buzz when operating 550 watts output. Drive on 6M
is 30 watts. SWR is 1.2:1 or better. Other bands the same. The
KAT500 memory is "trained" every 50 kHz on all band below 10M. In
fact with my ear again
Otherwise a science project with unknown results.
Bob, K4TAX
Sent from my iPhone
> On Jul 31, 2018, at 7:59 AM, Clay Autery wrote:
>
> Every successful project begins with a thorough analysis of the REQUIREMENTS
> and CONDITIONS.
> Proper design seeks to satisfy the entries on these lists w
NV DM09dn
> Washoe County
>
>> On 7/31/2018 7:21 AM, Bob McGraw K4TAX wrote:
>> Otherwise a science project with unknown results.
>>
>> Bob, K4TAX
>>
>>
>> Sent from my iPhone
>>
>>> On Jul 31, 2018, at 7:59 AM, Clay Autery wrot
Listening on 50.125 +/- 10 kHz beaming NW from EM76.
73
Bob, K4TAX
On 8/2/2018 11:35 AM, Richard AG5M via Elecraft wrote:
Got the word, I'm up on 6m, but absolutely nothing being heard up here in south
eastern WA. Bummer...
73, Richard AG5M
On T
With AFX utilized there is phase shift between left and right audio
channels. I don't seem to think it is constant phase shift, therefore
changes with frequency. This enhances the bi-aural effect of AFX. In
the hearing, thus two sources of the same signal, the leading phase will
be the lea
I downloaded my radio memories to the Elecraft Frequency editor and
saved the file. It opens nicely in EXCEL and can be edited accordingly
as it is .XML file format.
73
Bob, K4TAX
On 8/5/2018 8:30 AM, John Newgas wrote:
I have a KX3 not a KX2, but the Memory editor by DL2RUM works on an M
I would configure the station power such that the tuner is powered from the
switched source on the radio. Thus the power supply is on first and then the
radio is turned on and powers the tuner at the same time.
Bob, K4TAX
Sent from my iPhone
> On Aug 5, 2018, at 6:02 PM, Don Wilhelm wrote
Also there are applications that will remove scraps of updates, faulty
files, excessive Registry entries and such. Sounds like time to do
some in-depth computer house cleaning. Also, a virus or malware will
consume resources and really bog down a computer basically doing nothing.
I use a
As a long time MS advocate, "more power.more antenna". I run
500 watts to a 4 element HyGain Yagi at 55 ft.
You can reduce "F Tol to 100 Hz" to reduce the burden on the CPU, and
use Deep Decode. The software will configure the radio correctly. It
may set the radio to split if and as
That is the better way to handle power for the KAT500.
73
Bob, K4TAX
On 8/12/2018 8:57 AM, Ralph S. Turk wrote:
Can one use the 12vdc of the K3 to power the KAT 500? The K3 has the latest
update for the 12 dc.
Ralph, W7HSG/AFA9RT
Do understand in the K3 & K3S operation the actual output power is
controlled by the PWR setting on the radio. The PWR setting on the
WSJT-X screen is actually audio level. This should be adjusted about
mid scale for both TUNE and TRANSMIT. The radio Line Gain will then
allow you to adjust t
Yes, I find that the number of decodes is less this afternoon than last
evening. Yes, we've worked twice, last evening and again this
afternoon. Glad you have things going. I'm running my K3S at about
30 watts driving the KPA500 to 450 watts. The antenna is a 4 ele
HyGain at 55 ft fed w
I use the SWITCHED 12V source from my K3S. When I turn on the radio the
KAT500 powers up at the same time. This is per page 14, Operation in
the KAT500 manual. "Apply power to the KAT500 before or at the same
time you turn the K3/K3S on."
73
Bob, K4TAX
On 8/13/2018 9:38 PM, markmus...@
My solution is very simple. I ignore all calls unless they appear on
my caller ID from my contact list. Likewise on e-mail, my spam filter
gets 99.9% of all of them and they end being sent to the junk folder.
That folder gets emptied every 12 hrs. The one or two that get through,
also get
Does Heil have the settings on their website? I seem to recall they do. That
is a good place to start.
Bob, K4TAX
Sent from my iPhone
> On Aug 14, 2018, at 1:58 PM, Thomas Donohue wrote:
>
> I recently purchased subject mic and will be connecting it to the K3S
> shortly. Before I do that
I did purchase a Gigaware USB to serial converter cable from Radio Shack
as I recall. Loaded the drivers that came on the CD with the
purchase. Spent several hours over several days trying to get the thing
to work. It would almost work but gave me errors or didn't work at all.
Finally th
And it does not consider the volume or number of units sold either.
Rather poor constructed survey, in my opinion. More like a high school
popularity contest.
73
Bob, K4TAX
On 8/15/2018 11:07 AM, Peter W2IRT wrote:
Up to 2nd place now, but not a good representative sample. 100 votes for
I've said this and measured this for years with tube type amps, where as
I hear hams say they are running reduced power to "save the tubes".
That's HOGWASH. Determine the efficiency at reduced power vs. rated
power. The excessive heat at reduced power has to go somewhere.
I view running
Yes yes and yes. Amps are designed with the fixed output matching
network chosen for a value of impedance and energy transfer to be at
"rated power". Running any amp at reduced power then does not confirm
to the design of the output matching network and the efficiency
decreases. You aren'
I'd say a bit of common mode current on the feed line. I see that
from time to time with my KPA500 on certain bands/antennas.
73
Bob, K4TAX
On 8/17/2018 11:45 PM, Jeff Blaine wrote:
While running the KPA1500 in the SARTG tonight, I noticed that the
temp reading drops about 10C when transm
on earth.
73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com
On 18-Aug-18 7:12 AM, Bob McGraw K4TAX wrote:
I'd say a bit of common mode current on the feed line. I see that
from time to time with my KPA500 on certain bands/antennas.
73
Bob, K4TAX
On 8/17/2018 11:45 PM, Jeff Blaine
More info on the topic. I view the loss of WWV, WWVH and possibly WWVB
to have a major impact on world wide communication technology in many
ways. If WWVB operation is suspended, where would be the reference for
many of our atomic clocks?
73
Bob, K4TAX
The National Institute of Standards
The Saved Configuration file is automatically date and time stamped.
Although I don't know of a way to "see what's different", before I go
tampering with any of the values in my K3S, I save a configuration.
That way when and yes I said "when" I get things messed up I can easily
go back to t
Can't speak for a MAC but you should be using WSJT-X version 1.9.1.
Yes, the K3S should follow the WSJT band/frequency changes. And when
I change frequency or band on my K3S, the WSJT-X software changes
frequency/band accordingly.
I use a single cable between my K3S and computer. This is
If using a dynamic mike you should not have any connection to pin #6
anyway. So it would make no difference. The BIAS On and Off applies
to the back panel mike connection.
73
Bob, K4TAX
On 8/24/2018 10:53 AM, TL_Netvision wrote:
Hello all,
While trying different front microphones (Dynam
While one can measure a dummy load with an ohm meter, this is only the
DC resistance of the resistive element. It does not assure that it is
non-reactive as reactance is an AC component related to frequency.
Dummy loads should appear as 50 ohms at all frequencies within the range
where they
Although I have the standard 2.7 kHz filter in my K3S, the 2.8 is
reported to give a little bit better SSB sounding audio. From
experience with another radio, opening up the SSB BW 100 Hz gives a wee
bit better sounding audio. Emphasis on "wee" bit. As to the 2.1 kHz, I
opted for a 1.8 kHz a
Try to find carbon resistors as newer film resistors may be reactive.
Older carbon resistors have a tendency to migrate upwards in value. Be
sure to check them with a meter.
73
Bob, K4TAX
On 8/26/2018 7:50 AM, Bill Frantz wrote:
For my KX3, I built a dummy load from three 150 ohm 2 watt
In regard to filters, see http://www.elecraft.com/K3/Roofing_Filters.htm
for the explanation and justification and application of various
filters. Wayne and Eric have provided excellent real world advice in
this regard.
73
Bob, K4TAX
__
Windows has a mind of its own. It assigns ports as and when needed. Once done
it will keep it until something else changes. Just remember to check if it
doesn't connect in the future.
Bob, K4TAX
Sent from my iPhone
> On Aug 26, 2018, at 7:47 PM, Phil Kane wrote:
>
> Finally got it setup
I agree with Peter in that many hams use too much RX RF Gain and too
little attenuation. Per one authority on receiver performance, the
optimum receiver performance occurs when the no signal band noise is
about 10 dB above the receiver noise floor. Since we can't adjust the
receiver noise fl
Wouldn't taking the headphones off, rotating them 180 degrees and put
them back on do the trick? That way left would be right and right would
be left.
Guess I'm too dense to understand the acoustic phenomenon.
73
Bob, K4TAX
On 8/27/2018 12:36 PM, Jim Rhodes wrote:
A simple DPDT switch sho
I agree with Don, why not do AFSK and eliminate all the extra hardware
and cables? No one except you will know the difference.
73
Bob, K4TAX
On 8/30/2018 12:20 PM, Don Wilhelm wrote:
Peter,
You will have to gain access to the RS-232 DTR or RTS signals.
If you do not have the P3, you can
The value of SWR doesn't really inform us about the load impedance, line
current or line voltage conditions existing.
In the case of a 1.5:1 SWR, the load Z is 75 ohms, with a power of 500
watts the line current is 2.58 amps with a voltage of 193.6 volts.
At the same time a 1.5:1 SWR, the loa
Here is another good information source on baluns and specifically the
type of material and how it performs under various conditions.
http://www.karinya.net/g3txq/chokes/
As it is said "I have no dog in this fight".
73
Bob, K4TAX
On 9/2/2018 8:28 PM, Bill Frantz wrote:
This is one of the
I had assembled two K3 radios for friends that didn't believe they were
competent to do so. In doing this, I was able to use these radios for a
few weeks. I noted some artifacts regarding the receive audio and
elected not to purchase one for my station at that time.
Then came along the K3S
I have two original K3. Wondering if I missed something. The "S" has
improvements to receive audio? Or is this just referring to the new synthesizer?
Thanks & 73,
Josh W6XU
Sent from my mobile device
On Sep 3, 2018, at 7:24 AM, Bob McGraw K4TAX
Then came along the K3S with its
Personally having used two different K3 radios and then my K3S, the
difference was enough for me to buy a new K3S. Small or
incrementalnah, very noticeable specially coming from someone
{me} who worked in professional audio and recording studio environment
most of my career. Of course
Don't shortchange yourself by looking at only 1 or 2 parameters.
Here's the list. Some items can be upgraded in a K3 to make it almost
to the level of a K3S.
** Ultra low-noise synthesizer for exceptional strong-signal receive
performance and transmit signal purity (KSYN3A)
** USB port–in
Yes, well most of those are good sounding and..are larger than our radios
on our desks today. Small speakers can be expected to produce small sound.
Small as in acoustic output and limited frequency response. Just laws of
Physics. Don't expect to modify those laws.
Bob, K4TAX
Sent fr
I've used a separate receive antenna..once. Then I noticed
when I transmitted on my dedicated transmit antenna, I fried the front
end of my receiver. Won't do that again. Of course I was a green
General op at the time and that was in 1960. Since then.well I
chalk everythin
How does one measure transmit antenna efficiency?
Bob, K4TAX
Sent from my iPhone
> On Sep 9, 2018, at 2:36 PM, Mel Farrer via Elecraft
> wrote:
>
> Great Don,
> You and I grew up in the same time era..
> Now, I am wiser and have more CRS,Anyway, Here is my take on antennas
>
That's one of the reasons I asked the question. Normally antenna efficiency is
measured in an RF anechoic chamber. I'm not aware of one suitable in size for
HF antennas.
Bob, K4TAX
Sent from my iPhone
> On Sep 9, 2018, at 3:52 PM, Jim Brown wrote:
>
>> On 9/9/2018 1:03 PM, Mel Farrer via
Thanks Fred. I'm familiar with measuring broadcast fields for both
directional and non directional systems. The variances over the seasons
with varying moisture levels in the ground and the difference with and
without vegetation is clearly measurable and predictable. But still the
efficiency
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