Even more basic, why would a DXpedition want to bring a P3 along? Extra
box, weight, cables and no benefit.
73 de Brian/K3KO
On 4/25/2011 12:37, Bill W4ZV wrote:
>
> Gary Gregory-2 wrote:
>>
>> Certainly there are ways to use the K3 with a simple connection to a PC
>> but
>> when you are operat
You're going to do this while running a pileup 1000 callers deep?
DXpeditions exist to make QSO's, not watch TV.
If a DXpedition is having trouble making QSO's, a P3 isn't the answer.
Improving their antenna(s) and being aware of propagation most likely is.
73 DE Brian/K3KO
On 4/26/2011 12:08,
Roger,
You should see the crummy "DC" waveforms put out by typical laptop
switching supplies. I bought a bunch at a recent hamfest. Put each one
on a 'scope to observe the output. One had a 0.5 volt sawtooth
superimposed over the DC value. Another have ringing with introducing a
swing of o
Guys,
I've been playing around with the link VFO command.
K3 has a subrx. Subrx was on.
It works but not as expected.
If the VFO's are linked tuning A also tunes B.
However, the following doesn't happen:
1) Tuning VFO B does not tune A
2) A spot sent to VFO B doesn't also change VFO A to the s
I'm posting this for KK4AOA. He will be joining the group later.
He is doing a clean build.
The K3 is a K3-10 so far with an internal antenna tuner and five
filters. No subrx.
Running the utility program transmit power calibration works fine on
160,80 and 60M but fails on 40M.
Over the phone
The owner called Elecraft support.
They told him to tighten up the three screws on the bottom plate having
lock washers.
Voila, it works.
How did they know that? Incredible.
73 de Brian/K3KO
On 5/27/2011 00:05, Brian Alsop wrote:
> I'm posting this for KK4AOA. He will be joi
On 5/29/2011 13:43, drewko wrote:
> If I use a 50uv signal generator to set the filter gains for equal
> readings on my K3's AFV meter I arrive at the following compensations:
>
> 2.70 KHz = 0db
> 500 Hz = 4 db
> 250 Hz = 8 db
>
> This is way more aggressive than the suggested amounts but these
> f
On 5/29/2011 13:43, drewko wrote:
> If I use a 50uv signal generator to set the filter gains for equal
> readings on my K3's AFV meter I arrive at the following compensations:
>
> 2.70 KHz = 0db
> 500 Hz = 4 db
> 250 Hz = 8 db
>
> This is way more aggressive than the suggested amounts but these
> f
e would kick in the 200 Hz filter here. But some have said
this procedure sets the gain of the stage before the filters. So why
specify a filter width setting? What is monitored during the RF gain
adjustment process?
73 de Brian/K3KO
On 5/29/2011 14:02, Brian Alsop wrote:
> On 5/29/2011 1
I'd be for a narrow side "docking station" that gets all the connectors
out the back. Maybe it can do dual duty and serve to mount the unit
upright instead of laying on it's back.
With all cables in place, it resembles an octopus that would be hard to
integrate into a fixed station.
73 de Bri
Don't you guys think that if these EMP events happen one will have other
bigger issues to worry about than what happened to a ham radio? It
might not matter at all because you and perhaps the entire city you live
in may be dead.
73 de Brian/K3KO
On 6/1/2011 08:24, Bob DeHaney wrote:
> Google
The lesson is:
If you change menu items related to K3 calibration settings, reboot the K3.
Here's what embarrassed me.
A local recently licensed ham brought his newly built K3-100 over for
some final tuneups.
We checked the various earlier calibrations done and then went to the RF
gain calibr
I guess I'm just a Missouri mule. However, I see that most of these
posting praising the KPA500 and the posters don't even have one.
Wouldn't logic say, you can't make a comparison without having the items
you're comparing?
BTW in the 500 vs 1500 watt debate, there is a tool which can pretty
Wayne,
Please make this retroactive to June 2008. I went through the K3
assembly and operator's manuals at least a dozen times while waiting for
the K3 to ship. I'm sure others did the same.
This rehearsal, mental assembly, helped lots when the kit showed.
Also helpful was following the Elecr
Guys,
I'm curious what is the max front panel temp you're seeing after a
period of operating with significant transmit time? Also what is the
room temp at this value.
The reason I ask has to do with the K3 Master Oscillator calibration
procedure and later drift. A detailed set of measurement
Actually this is not what Electraft recommends. You want to stay at
about 5 bars for stable power output in digital modes.
This is old thinking based upon a different rig design.
73 de Brian/K3KO
Windows volume control to
> keep advancing speaker volume and watch the ALC bars. When you get i
Don,
Noise reduction is unavailable for K3 digital modes. You get a N/A when
trying to use it. (If you really want to try it you'd have to use USB.
A high potential exists for poor copy with NR on.)
Oddly enough NB is selectable. I can imagine some of the higher
settings of NB can likewis
This seems so in many cases but it is very doublet length dependent.
I ran one case in TLW with 45' of 450 ohm line that came out as 13 ohms.
With a 4:1 balun you'd probably be dropping this further. High
current and most likely not a match.
The best suggestion is to model the antenna at hei
V4 Passive 3606
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian Alsop
Sent: Wednesday, November 28, 2012 1:48 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] CW Skimmer & K3
The +/- 12 KHz limit can be ov
A year or two ago I obtained a K3 subrx definition file SKIMMER.
Clicking calls on the bandmap or call list and sends VFO B there.
It only works if you have a subrx and are tapping the subrx IF. (I
think) I don't know what will happen if you are in "split" w/o a subrx
using VFOA IF output.
I
Getting this combo to work here was an interesting challenge.
1) The RCS-10 control box outputs a 3 bit binary signal to control 8
antennas
2) Several antennas that are multiband.
3) I have a remote A/B switch box with that is DC powered over the coax.
4) I wanted to also have the KPA-500 follo
Carl,
You are right.
You can do it yourself though if you have a subrx.
http://groups.yahoo.com/group/Elecraft_K3/files/KRX3_IF_Out/
Works just fine.
At one time, I fooled around with duplicating the K3 JFET output
circuitry present in the main RX. The use of the Clifton Labs
buffer/isolati
Was checking out RTTY decode which worked fine. Decided to look at CW
decode.
Here are my observations.
Not working well here or op here inept at using it.
My perception is that it did much better in older versions. However, I
didn't use it much then.
ZL9HM was 599 @35 wpm this AM. WPM c
Jerry,
If you want some numbers to chew on.
@65' a 40 meter dipole has an impedance of about 73 ohms. SWR=1.5
The same antenna on 20M has an impedance of 3788 - j1648 ohms with an
SWR of 89! Very high impedance. Why the K3 matched it, I can't say.
Do you think the KAT500 should be able to
This whole issue has been solved by VHF/UHF stations a long time ago.
They use a sequencer to key and unkey various components with
appropriate delays to prevent damage.
They can be built or bought fairly cheaply.
Yes it would be desirable to have the "sequencing" be automatic. One
"size" is
I'm wondering if others might benefit from an additional bit being added
to the ABCD band data making it ABCDE. This could permit:
1- 32 choices (programmable by the firmware program?)
2- phone/cw antenna automatically being switched or another antenna
being switched to at a certain cutoff fre
Sure could have used the extra 5-7 db when chasing the recent ZL9
Dxpedition on RTTY from the East Coast.
73 DE Brian/K3KO
On 12/18/2012 20:31, Phil Hystad wrote:
I agree, the path is clear -- it is obvious --- sell the Commander as 5 to 7 dB
is not worth having extra stuff around to fool wit
The first rule in troubleshooting is to unplug everything that isn't
absolutely necessary to the equipment being diagnosed.
In this case all that would be needed is power, ant/dummy load and the K3.
Then start plugging things in until you find the offending device.
73 de Brian/K3KO
Ian Kahn -
Guys,
I found it interesting that PSK31 signal strengths on my panadapter are
as large as typical CW/SSB signals.
Either there is something magic about PSK or PSKer's are not the wet
noodle/5 watt crowd any more.
73 de Brian/K3KO
-
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Jay,
I had one of these in my attic for several months.
I had to tune each band by generally shortening the elements.
Start at 10M. Find its resonant point via antenna analyzer or by
"sweeping" frequencies with your SWR meter. You need to confirm that
the resonant point is too low before tr
Don,
Interesting that one never knows just how the quoted inductance is
determined.
Do you have any idea just how the Elecraft quoted inductances are
determined?
If measured, what frequency and test jig.
If based upon calculations, how much as built variation will there be.
Have had the sa
Question: What "band" is selected when the Radio=BCD and the inputs are
open?
It appears to revert to RF sensing.
The situation is this. Antenna switching stuff automatically echos the
band BCD data to the KPA-500. The exception is if one manually selects
an antenna. In that case power to
dware? Ideally I would think the antenna switching would
only listen in on the K3 BCD outputs and react accordingly, but you may
have implemented something more complex.
73,
Don W3FPR
On 1/5/2013 8:34 AM, Brian Alsop wrote:
Question: What "band" is selected when the Radio=BCD and the input
This has happened enough to raise it as an issue.
I have a SDR on the subrx IF. I operate mostly CW. The SDR is set so
that frequencies agree at zero beat on CW. A/B VFO's are linked for
normal everyday operation. I use ROCKY for everyday use and SKIMMER for
contests.
If I change mode to
Sounds like the 4:1 balun may be overheating on 12M. Chances are if
you've been doing this for a bit, it's ruined. Heat anneals the core
and changes it's electrical properties for the worse. Heat may have
cracked it.
Now whether a 4:1 balun is the thing to use is another issue.
You don't sa
spread for bead baluns-- although
this isn't the case here.
73 de Brian/K3KO
On 1/9/2013 17:26, David Gilbert wrote:
If that balun had overheated and become ruined on 12m it almost
certainly would have affected other bands as well. A ruined balun is a
changed balun.
Dave AB7E
On 1/9
CWT is not working as well in 4.61 either. It doesn't hit zero beat
within 4 Hz. It used to be spot on. This observation was made and
posted here when 4.61 came out.
73 de Brian/K3KO
On 1/16/2013 18:36, Chad Wasinger wrote:
Has anyone experienced any issues with not decoding a good cw sig
Now if we only had some decent labels to stick on those "10 switches"
Conventional computer labels seem to last a couple weeks before peeling
off. Tiny writing isn't my strength so they are cryptic and only
marginally readable. M1-M4 require diagonal printing.
The other criterion is they hav
Larry,
Is this antenna different from other bands or has it band specific
components?
It sounds like a set of dirty relay contacts or a bad joint. I've had
this on a few antenna switches. The xmit voltage is enough to punch
through but microvolts aren't.
73 de Brian/K3KO
On 1/24/2013 16:
Hmm, wouldn't the DSP filter be good enough for this purpose?
Except for obnoxious PACTOR, there are generally not the 40db over S9
signals to reject.
73 de Brian/K3KO
On 1/27/2013 14:17, KD8NNU wrote:
I use mine for digital modes. There are times where a 500 hz could be
too narrow. That
Let me know if you have one available and shipped price.
73 de Brian/K3KO
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__
Elecraft mailing
Guys,
Maybe this has come up before. It is now obvious that the K3 firmware
program will not work on a virtual serial port (LPBRIDGE). Tried.
For curiosity, why is that?
73 de Brian/K3KO
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Version: 2012.0.2238 / Virus Databa
Ariel,
Please explain to me how your SWR measurements translate to ERP.
There are a whole bunch of things potentially between your rig and the
antenna. Then of course there is antenna pattern.
I once had a summer job at Airborne Instruments Labs. Part of the
"summer trainee" job was to lis
On 2/26/2013 20:13, Rick Bates wrote:
It isn't.
One needs a 3 amp 18vac AC wall wart, diodes, a few caps an LT1803
adjustable regulator and a few resistors.
The use of an AC wall wart eliminates any switching supply concerns.
73 de Brian/K3KO
It shouldn't be difficult to build a small, line
Frank,
Yes the standard TXCO is good enough for JT65. It is also good enough
for WSPR which is even more picky.
Last test I did of drift was at 24.9 MHz. The K3 (standard TXCO)
drifted 3Hz/hr (after a 6 hours of warmup) relative to my Rb standard.
Expect more if you just turn K3 on and use
This illustrates why the K3 needs more programmable buttons.
I programmed this function on M2 button since I never need memories.
The unlink is done the programmed M4 button--in conjunction with unsplit.
I use this a lot.
73 de Brian/K3KO
On 3/4/2013 14:58, LA8AW wrote:
Today it happened agai
The sub button is already too multifunction. Anything that could be
done to have it default to two selections would be appreciated.
Unlike others, I use link without diversity quite often. So having a
button to control this is a need for me.
73 de Brian/K3KO
On 3/5/2013 04:30, Gary wrote:
Fred,
Here are two uses for VFO linking w/o diversity. I'm sure there are others.
Single SDR/panadapter/skimmer on VFO B IF. During everyday operation
linking the VF0's allows display of what's on VFO A centered on VFOA
frequency. The only other alternative would be an a/b switch or a second
I really miss extra programmable buttons on the K3. To remedy this, I
created a "button box" that has 20 programmable buttons.
It's pretty elementary with a 4x4 keypad and four push buttons. One
PIC, one voltage regulator and a MAX232 for RS232. All buttons are
in-circuit programmable. Thi
I don't seem to find any way to set upper cut and lower cut values via a
macro. The programmer's manual doesn't seem to have mnemonics to do so
Is it even possible? I know one can set the bandwidth and shift. Is
that what we're supposed to do? I'd rather set the individual "cut"
values indepe
ee is the FI and FW commands, so one must "do the math" to
simulate HiCut or LoCut. Move the IF center frequency by half the
reduction in width.
73,
Don W3FPR
On 3/7/2013 9:27 PM, Brian Alsop wrote:
I don't seem to find any way to set upper cut and lower cut values via
a macro. The
It's called "progress". It doesn't have to be a P3. Look at the ire
the use of SKIMMER has generated.
Now guys have to figure out how to intelligently use the new gadgetry.
Working DX will still be an developing skill. Those without the
technology will moan and complain about it being unfair
Nick,
This reflects the sad state of the US psyche.
To generations past "buy" or "buy assembled" would not even be considered.
Their first reaction to a need was to make something from what materials
they had on hand. Clearly this is anti-consumerism and not politically
correct these days.
Guys,
Looking for some insight.
I was doing some checkout of a device. The device output a +10/-10V
RS232 signal swing from a MAX232 device.
When it was attached to a PCI serial port card, the output dropped to
+2.5/-10 V. In other words, the PCI card was clamping the input
positive value
Did you notice the reported 6M sensitivity number?
1.25 microvolt compared to 0.16 microvolt on 1.8-30MHz.
This may be a misprint as the MDS values are close to the same.
73 de Brian/K3KO
On 3/16/2013 03:09, David Gilbert wrote:
The transmit IMD specs are pretty poor as well ... and the intere
I have an earlier ACER netbook with a smaller screen which runs winxp.
The thing is amazing. It is a dual core machine It runs everything I
tried.. The HD screen does present some problems. One may definitely
need glasses if over 40.
The only problem I had was with the built in webcam. I
Anybody know if this is so?
I'm talking about sending data to the K3, not receiving data from it.
Much to my surprise, my computer accepts TTL level input as long as the
polarity is right.
Being lazy. I just haven't gotten around to trying it yet.
73 de Brian/K3KO
-
No virus found in t
These kind of installation problems are not rare.
TWC did the original installation here.
A few years later while troubleshooting a low signal problem they found:
1)Several corroded connectors from the street to the house
2)An extra unterminated splitter in their house mounted box.
3)Replaced an
I was doing something odd. Stock 2.7KHz filter, CW mode, V4.61.
Removed all equalization.
Wanted to adjust high cut or low cut. Tapped shift control. Did not
revert to high cut/low cut mode. Ditto for tapping width control.
Can't simulate this with shift because of it's limited range.
Hig
Shift =.05 does do something but the result still is not as expected.us.
Here's the results with a 2.7 KHz filter
First high cut maxs out a 2.0 KHz, low cut can go to zero.
High cut low cut
2.0 no effect
1.8 0-0.2
1.6 0-0.4
1.4 0-0.6
1.2
I notice that in the narrower signal spectrun the two tone peaks have
the same amplitude.
Many of us have wondered why our watt meters diddled like the RTTY tones.
Hopefully that is fixed too.
73 de Brian/K3KO
On 3/25/2013 19:59, Hank Garretson wrote:
Andy, K0SM has a very nice look at t
at 8:27 PM, Brian Alsop mailto:als...@nc.rr.com>> wrote:
I notice that in the narrower signal spectrun the two tone peaks
have the same amplitude.
Many of us have wondered why our watt meters diddled like the RTTY
tones.
Hopefully that is fixed too.
Not fixed. S
nty K2DLJ
-Original Message- From: Brian Alsop
Sent: Monday, March 25, 2013 5:56 PM
Cc: ElecraftReflector
Subject: Re: [Elecraft] [Elecraft_K3] A Different View--K3
Reduced-bandwidth RTTY Analysis
Interesting. At at least the transition between the mark and space
amplitudes are smoothed some.
Have two. Both with Clifton Labs preamp/isolation board. In die cast box.
Been used on my K3 VFO A and VFO B.
$75 each including priority mail.
Brian/K3KO
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Ron,
For what purpose is 25 watts more than enough?
I can tell you it isn't enough to try and work VU's and other Asians
under many conditions from the east coast on PSK.
The are times that no amount of legal power will suffice-- e.g. trying
to break through an EU curtain to some rare one.
Th
Guys,
Smith charts are great once one has made it up the steep learning curve.
A alternative simple approach for common needs is the TLW program.
The TLW program which came with the ARRL Antenna Handbook on CD computes:
1) Load complex impedance given the shack end coax type and cable type
an
Did two of these today. One had a subrx. One did not.
Instructions didn't mention that the subrx aux cable interferes with
pulling the K3's amp module. At least I was concerned about bending amp
connector pins if it were tried.
Ended up also removing the I/O board and pulling out the cable f
Have you tried these settings? It's easy to do with a signal generator.
You might not like them.
From what I can tell your settings kick in the AGC at S9. At that
point you have about 54db of audio change from weakest to strongest.
It then goes up from there. How much depends upon how Elecraf
Of course, if one uses the port for rig control, SKIMMER, a P3, or
anything else, one would have to resort to a virtual port program which
allows several devices to talk to the K3. I also believe the the keypad
device will have to work at a speed of 38K.
In concept this is just a PIC with a le
Guys,
I may be imagining things, but this effect seems to always be there with
my K3. My perception is that it is not just limited after band changes
or power level changes. It is especially evident when running a big amp
that has a fast display of output power.
Where it may matter is in con
> more ramp-up. I use only CW and after the ramp-up the first dit is at full
> output.
>
> I'm using the KPA500 here.
>
> Amateur Radio Operator N5GE
> ARRL Lifetime Member
> QCWA Lifetime Member
>
> On Sat, 02 Jun 2012 15:21:31 +, Brian Alsop wrote:
>
&g
I was perusing power toroids in the Mouser Catalog. Interesting find.
A 2.5kVA toroid costs almost $400 and weighs over 40 pounds.
That's of course problems with big amps-- weight.
73 de Brian/K3KO
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Version: 2012.0.2178 / Virus
Wouldn't viewing the K3's voltage display as power was increased have
helped in solving this more quickly?
73 de Brian/K3KO
On 6/3/2012 20:49, David Inger wrote:
> I recently sent a message to the group regarding the fact that my K3 would
> shut off at power levels over +/-50 watts. I tried two
Any key will do as long as you use it. Reduced CW receiving speed
generally has little to to do with the key. It does have a lot to do
with having CW QSO's.
Alternatively, skip the straight key and go straight to a bug or keyer.
Now I'm going to contradict the above.
Unlike conventional wisdo
I hope all versions of Ubuntu come with a super decoder ring so that
mortals can make sense of these obviously encrypted commands.
73 de Brian/K3KO
On 7/7/2012 16:51, KC6D wrote:
> I had trouble getting the KX3 Utility program to communicate with the radio
> in Ubuntu. Here's what solved the
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.
I used to use computer switching with
How about taking the money you'd spend for the KAT500 and put it towards
antenna(s) that don't need a tuner? There are lots of multiband
antennas out there. Some cost less than the likely cost of a KAT500.
73 de Brian/K3KO
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Unfortunately, this scenerio is exactly what I expect many with
KAT-500's to actually try and tune. Unless there is some logic built in
to the tuner to inhibit operation for these crazy conditions, the future
is going to be full of "toasted toroids."
The scenerio goes as follows. The tuner tu
Guys,
This may be of some use to those interested in locking the K3 to an
external source. The issue of what kind of source to used has been the
subject of a number of postings.
Clifton labs did the above comparison. Jack's Rb standard came in at
about .0004 Hz relative to a GPS DO at 10MHz.
I seem to recall that somebody demonstrate a similar artifact in the RF
gain control to Elecraft at Dayton. Anybody recall just what that demo was?
73 de Brian/K3KO
On 7/21/2011 21:37, Don Wilhelm wrote:
> Ed,
>
> Something is strange. It may be your ambient noise level, so try it
> with the K
Bob,
One kluge is to set L-MIX-R to Ab Ab and LIN OUT = Phones
You'll get both the main and sub audio on one channel.
It does require riding the main/sub AF gain control at times.
I use this with my DXP38 TNC.
One can usually ID the station being worked by copying the 5nn they send
by ear anyho
Yes, but you don't know beforehand whether you need it or not. One has
no info on the strength of other signals at the DX location or whether
he suffers from S8 QRN.
So WFWL -- Watts first or weep later.
73 de Brian/K3KO
On 7/31/2011 23:06, N2TK, Tony wrote:
> Hi Fred,
> A watt is a watt. A S
Hi Sam,
Agree. They also don't report how the guy they worked had to struggle
to pull them out or what his equipment was.
I did a breakdown of the maximum distance to 100, 200 and 300 DXCC
countries for each country of the world. EU certainly has a big
advantage. Several EU countries have 10
Guys,
Used this to calibrate my Rubidium standard. Have no further use for it.
Working unit is complete with power supply, GPS, active antenna
interconnect cables and Windows software.
See:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=290322053618
for pix of it.
Contact off reflector.
Len,
Thanks for this post. A local here can't get his KPA500 running due to
the same fault.
I've forwarded it to him. At least if paragraph 2 works for him, he can
feel that the amp "works" -- sort of.
He and Elecraft are in touch about this problem.
73 de Brian/K3KO
On 8/27/2011 16:04, Le
See page 4 of the manual.
73 de Brian/K3KO
On 9/22/2011 22:40, K7WIA wrote:
> My KPA500 will be delivered tomorrow.
> what i need to know is that I plain to run it on 240 v... what plug if any
> comes with it?
> Ed K7WIA
>
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Ver
Barry,
SPLT SV =NO has a downside. If you're chasing a multiband DXpedition
working split, setting it to NO will cancel split when you change bands.
Thus you run the risk of NOT being is split while calling the DX if
you're jumping about bands. Worst yet, the self appointed cops will
start s
Horizontal desk space is indeed in short supply. Wide screen monitors
have been a real negative impact.
Odd question: Can the KPA-500 be rotated 90 (book in bookcase form) and
operated that way to save horizontal desk space? One can imagine
putting it on a desk end to still allow cooling. (
Guys,
SMH apparently has a 1db per unit slope to it.
Using a signal generator and attenuator it appears to have this slope
over the 70 db range of my attenuator. S9+60 appears to have a value of 100.
Very useful for antenna pattern testing without the need for an attenuator.
I used K8LP's late
Hmm, this works out to an efficiency of 87%!
Not sure I believe that.
73 de Brian/K3KO
On 11/28/2011 20:34, Roy Morris wrote:
> My KPA500 is as follows:
> 500 watts indicated on LEDs
> Current: 10.3 Amps at 500 watts indicated on LEDs
> Idling current: (key down - no modulation) 400 ma
> Voltage
Guys,
How are we defining smart meters? There appear to be a class which only
can be read remotely. Then there appears to be a class which have the
ability to control various house heavy current devices (e.g. heat
pumps). For all I know the may be only one meter with the ability to
connect "
Interesting.
Just a thought:
To rule out or identify hardware problems, I wonder if someone with
"mush" problem would be willing to loan Elecraft the offending rig?
I wonder just how "exactly" on frequency guys calling from spots really
are? Spots are quantized in 0.1 KHz steps. Many radios a
Actually you ought to start with the DSP first. IF NB is a last resort
because it can generate trash when a strong signal shows up outside the
passband.
73 de Brian/K3KO
On 9/5/2013 23:39, Cady, Fred wrote:
_I have a pretty high line noise problem here on six meters and the NR doesn't
make
Just for curiosity, what is the purpose of this Elecraft net?
Is any technical information exchanged?
73 de Brian/K3KO
On 9/15/2013 13:07, Charlie T, K3ICH wrote:
I know it would take a few more net control volunteers, but the Collins
Collectors Association net on 14.263, Sundays at 2000Z usua
Joe,
There easy work around to this-- like adding a series resistor between
AF output and earphones. Some earphones have built in volume controls.
I use the non-fixed output of the K3 all the time for RTTY receive.
Having some control over the audio into the decoder is sometimes an
advantag
Dale,
I agree.
Autotuners for many of us who do frequent fast search and pounce can
indeed slow things up. The last thing you want when trying to pounce on
a rare one (before the mob arrives) is to have the amp off line-- even
for half a second.
The best tuner is none.
A bunch of fixed co
A lot of the need for a tuner here would vanish if the KPA500 could
handle a 2.5:1 SWR. Phone->CW band excursions could be tolerated
without exceeding that limit. I've looked at the voltages and currents
involved. At 500 watts, they don't intractable.
I wonder if the incremental cost would
What if one defined the IF of the P3 to be at some PSK frequency and
connect a loop of wire to it's RF input? Put the loop on the desk.
There might not be enough resolution to clearly see anything but gross
PSK signal infidelities.
73 de Brian/K3KO
On 9/24/2013 16:40, Edward R Cole wrot
I wonder if someone who has significant WSJT-X experience would like to
pontificate of the real benefit of squeezing out another KHz of
bandwidth out?
It seems to me on HF one is simply inviting in more signals which can
potentially de-sense the RX. That wipes out the benefit of the weak
sig
Guys,
There has been quite a bit of discussion about use of very wide filters
for HF narrow signal mode operation here recently. If QRM gets to be a
problem the fallback position is to narrow the filter.
Keep in mind the following. The AF pitch you will get for a fixed
frequency signal is
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