Re: [Elecraft] Ken Kopp K0PP

[Jim Brown]

On 7/2/2021 10:26 PM, Vic Rosenthal wrote:

What a beautiful tribute.
I too had a lot of help from 20-something hams when I was an annoying teenager.


As a teenager wanting to be a ham, and later with my license, I got lots 
of help from guys who seemed old to me at the time. I'm guessing most 
were in their '50s, the oldest in their '60s. I'll be 80 in the fall, 
and have spent much of my life giving back. That's the spirit of ham 
radio, and of LIFE!


73, Jim K9YC
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] FTDI driver on Win10

[C.A. Jones]

FWIW, I plugged KXUSB into my Win10 Pro PC, and as reported by Dave WO2X,
it operated as intended (communicating with KX3) w/o having to install
drivers.

Quite generally, my modus operandi with stuff like this is to just plug it
in and try it before investigating possible additional required actions.

73
CJ  -  K2CZ

On Fri, Jul 2, 2021, 23:56 Jim Brown  wrote:

> On 7/2/2021 7:48 PM, Don Wilhelm wrote:
> > I would advise you to download and install the latest FTDI drivers from
> > the FTDI website.
> > My understanding is that Win 10 does no longer include the FTDI drivers.
>
> I just went through this on a new (to me) Windoze 10-64 machine that I
> wanted to use for logging VHF. All the software installed, checked out,
> but didn't bother to connect to K3. Ended up subbing another computer.
> Tonight, did the troubleshooting after advice from my trusty computer
> guru, who told me exactly this. I downloaded the drivers from FTDI,
> pointed Windoze Update Driver to the folder where they were, hit next,
> and they were installed.
>
> Without that driver, the USB to USB cable for the KPA1500 also didn't work.
>
> 73, Jim K9YC
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to cajo...@gmail.com
>
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] FTDI driver on Win10

[David Olean]

I have been adding several newish computers for ham radio to bring 
myself farther  into the 21st century. Lately Win 10 does not 
automatically install the FTDI adaptor. My latest computer as of about 
May 1st (brand new from Dell) did not load the driver when I plugged the 
FTDI adaptor in. I had to do it manually.  In the past it loaded all by 
itself.


Dave K1WHS

On 7/2/2021 11:55 PM, Jim Brown wrote:

On 7/2/2021 7:48 PM, Don Wilhelm wrote:
I would advise you to download and install the latest FTDI drivers 
from the FTDI website.

My understanding is that Win 10 does no longer include the FTDI drivers.


I just went through this on a new (to me) Windoze 10-64 machine that I 
wanted to use for logging VHF. All the software installed, checked 
out, but didn't bother to connect to K3. Ended up subbing another 
computer. Tonight, did the troubleshooting after advice from my trusty 
computer guru, who told me exactly this. I downloaded the drivers from 
FTDI, pointed Windoze Update Driver to the folder where they were, hit 
next, and they were installed.


Without that driver, the USB to USB cable for the KPA1500 also didn't 
work.


73, Jim K9YC
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to k1...@metrocast.net 

__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

[Elecraft] SDR Filter improvement

[Geoffrey Feldman]

My career has been in software/hardware systems including some with signal
processing.  Digital filters ultimately embody mathematical equations which
operate on a matrix of samples represented as complex numbers.  IQ stands
for incident and quadrature, sine and cosine, real and imaginary or x and y.
All are the same concept but different nomenclature as represented in
memory.  Connect to the IQ out of your Elecraft rig you are getting that
stream as left and right base band audio.  A sound card and a bit of
software will convert that base band left and right to the numerical
representations.  From there you can implement whatever is actually possible
in this technology as a software experiment on your own PC.  Create your own
SDR Radio using the Elecraft hardware and experiment with filters, create
your own pan adapter or whatever.   If successful you will have a prototype
to share with Elecraft.

 

What is more likely is that you will more fully appreciate the value you
receive from Elecraft and all the hard work they did.   It's not easy to
improve on.   Signal Processing ALWAYS involves some fairly hairy math and
hairier software to implement it correctly as a real time experience.  The
filter you want may be one that actually can be implemented.

 

Direct Conversion SDR is a great technology to reduce cost and/or size in
relationship to a similarly good receiver.  However, it has limitations
which relate to artifacts from the sampling process and dividing a
continuous stream of audio into "bins" or snapshots in the stream.  Analog
filters in the IF stage is still a factor in design and you will see hybrid
SDR as an alternative to direct conversion designs.  Similarly even in
direct conversion, there are some RF pre-filters.  This last bit, is
argumentative and wise persons will differ.  It's the same discussion as
tubes/transistors or vinyl/cd's  etc. in the audiophile world.  A lot comes
down to perception and how we personally discriminate what we hear, want to
hear, don't want to hear.   Additionally there is processing (digital or
analog) of received audio, changing frequency response as an aid to this
perception process.  The Heil PRAS is a great example of that sort of
processing.  He has a terrific demo of that.

 

Finally people with traditional hardware training find themselves at the
deep end of the pool with all this talk of matrices of complex numbers.
People with software training find themselves at the deep end of the pool
with the pragmatics of actually getting RF into their world of 1's and 0's.
It's fun to watch them trying to get along in a state of panic while in the
deep end of the pool.  Again, hats off to Elecraft for helping them all to
swim and catch great products.

 

Geoff

W1GCF

__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] FTDI driver on Win10

[David Decoons]

Dell loads an OEM version of Windows 10, complete with their “bloat ware”. I 
use a true Windows 10 Pro ISO from Microsoft, not the home version or OEM 
version. That may explain why some do not need drivers and others do. I just 
installed a fresh copy of full Windows 10 Pro (created USB installer downloaded 
from MS) onto an HP Z420 workstation. I plugged in the KXUSB cable and Windows 
automatically configured the com port. I did need drivers from HP for other 
hardware in the workstation.

Best advice I can give you is plug in the cable and wait about 30 seconds to 1 
minute to see if Windows detects the cable, if it doesn’t then download and 
install the driver.

73
Dave wo2x

Sent from my iPad

> On Jul 3, 2021, at 8:35 AM, David Olean  wrote:
> 
> I have been adding several newish computers for ham radio to bring myself 
> farther  into the 21st century. Lately Win 10 does not automatically install 
> the FTDI adaptor. My latest computer as of about May 1st (brand new from 
> Dell) did not load the driver when I plugged the FTDI adaptor in. I had to do 
> it manually.  In the past it loaded all by itself.
> 
> Dave K1WHS
> 
>> On 7/2/2021 11:55 PM, Jim Brown wrote:
>>> On 7/2/2021 7:48 PM, Don Wilhelm wrote:
>>> I would advise you to download and install the latest FTDI drivers from the 
>>> FTDI website.
>>> My understanding is that Win 10 does no longer include the FTDI drivers.
>> 
>> I just went through this on a new (to me) Windoze 10-64 machine that I 
>> wanted to use for logging VHF. All the software installed, checked out, but 
>> didn't bother to connect to K3. Ended up subbing another computer. Tonight, 
>> did the troubleshooting after advice from my trusty computer guru, who told 
>> me exactly this. I downloaded the drivers from FTDI, pointed Windoze Update 
>> Driver to the folder where they were, hit next, and they were installed.
>> 
>> Without that driver, the USB to USB cable for the KPA1500 also didn't work.
>> 
>> 73, Jim K9YC
>> __
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft@mailman.qth.net
>> 
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to k1...@metrocast.net 
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to rocke...@gmail.com
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

[Elecraft] K3 Transmit Issue

[Toast]

I recently installed the second channel and general coverage receive options on 
my k3 with the 100w transmitter.   I have double checked the settings but get 
now transmit power.

Any ideas on what the issue is?

Rob Mantz
NR4B 

Sent from my iPhone

__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] K2 Only 30-metre Band Works

[VA1CQ]

Hi Don,

I have discovered I installed K1 and K2 backwards. The location bar on 
each relay is facing in the opposite direction ("down") from the other 
relays. The manual Parts Placement Drawing clearly shows all relays 
oriented vertically must have the bar on the relay at the "top". I can't 
imagine why I did that. Unless the stenciling on the PCB is wrong 
(highly unlikely), then it's my fault for not following the manual. I 
can't see the PCB stenciling now since the relay covers it.


This explains why I could not tune the 40 metre band. And probably 
explains other things I couldn't do too. I discovered this when I 
started measuring voltages around K1.


This will be difficult to correct. The two relays are flush with the 
board. I can't cut them off since I have no access to their pins. I will 
need to solder suck and wick them out. Fortunately, their pins are not 
bent but straight through their solder pads.


Any tips on removing them would be appreciated. I'm hoping these or 
similar parts are still available.


73,
Murray VA1CQ



--
This email has been checked for viruses by AVG.
https://www.avg.com

__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] SDR Filter improvement

[Walter Underwood]

Two things about terminology. First, IQ is generally in-phase and quadrature.

Also, what you are describing as direct conversion is commonly called direct 
sampling.
The K4 is a direct sampling receiver. The KX2 and KX3 are direct conversion 
receivers,
converting RF directly to baseband without an IF. The KX2 and KX3 are also 
SDRs, but
with sampling at baseband. The filtering, demodulation, and modulation is done 
in software.

This article has a nice bit of history about direct conversion receivers.

https://www.n5dux.com/ham/files/pdf/Direct%20Conversion%20Receivers%20History%20-%20W7ZOI.pdf
 


wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Jul 3, 2021, at 5:48 AM, Geoffrey Feldman  wrote:
> 
> My career has been in software/hardware systems including some with signal
> processing.  Digital filters ultimately embody mathematical equations which
> operate on a matrix of samples represented as complex numbers.  IQ stands
> for incident and quadrature, sine and cosine, real and imaginary or x and y.
> All are the same concept but different nomenclature as represented in
> memory.  Connect to the IQ out of your Elecraft rig you are getting that
> stream as left and right base band audio.  A sound card and a bit of
> software will convert that base band left and right to the numerical
> representations.  From there you can implement whatever is actually possible
> in this technology as a software experiment on your own PC.  Create your own
> SDR Radio using the Elecraft hardware and experiment with filters, create
> your own pan adapter or whatever.   If successful you will have a prototype
> to share with Elecraft.
> 
> 
> 
> What is more likely is that you will more fully appreciate the value you
> receive from Elecraft and all the hard work they did.   It's not easy to
> improve on.   Signal Processing ALWAYS involves some fairly hairy math and
> hairier software to implement it correctly as a real time experience.  The
> filter you want may be one that actually can be implemented.
> 
> 
> 
> Direct Conversion SDR is a great technology to reduce cost and/or size in
> relationship to a similarly good receiver.  However, it has limitations
> which relate to artifacts from the sampling process and dividing a
> continuous stream of audio into "bins" or snapshots in the stream.  Analog
> filters in the IF stage is still a factor in design and you will see hybrid
> SDR as an alternative to direct conversion designs.  Similarly even in
> direct conversion, there are some RF pre-filters.  This last bit, is
> argumentative and wise persons will differ.  It's the same discussion as
> tubes/transistors or vinyl/cd's  etc. in the audiophile world.  A lot comes
> down to perception and how we personally discriminate what we hear, want to
> hear, don't want to hear.   Additionally there is processing (digital or
> analog) of received audio, changing frequency response as an aid to this
> perception process.  The Heil PRAS is a great example of that sort of
> processing.  He has a terrific demo of that.
> 
> 
> 
> Finally people with traditional hardware training find themselves at the
> deep end of the pool with all this talk of matrices of complex numbers.
> People with software training find themselves at the deep end of the pool
> with the pragmatics of actually getting RF into their world of 1's and 0's.
> It's fun to watch them trying to get along in a state of panic while in the
> deep end of the pool.  Again, hats off to Elecraft for helping them all to
> swim and catch great products.
> 
> 
> 
> Geoff
> 
> W1GCF
> 
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to wun...@wunderwood.org 

__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] K2 Only 30-metre Band Works

[Don Wilhelm]

Murray,

Yes, Elecraft has those relays.

If you do not have adequate desoldering gear, the the best way to remove 
them is to crush the case so you can remove the pins one at a time.  
Clean up with solder wick and if solder remains in the holes, push it 
out with a wooden toothpick.  Use whatever tool works to crush the relay 
cases.


73,
Don W3FPR

On 7/3/2021 2:03 PM, VA1CQ wrote:

Hi Don,

I have discovered I installed K1 and K2 backwards. The location bar on 
each relay is facing in the opposite direction ("down") from the other 
relays. The manual Parts Placement Drawing clearly shows all relays 
oriented vertically must have the bar on the relay at the "top". I 
can't imagine why I did that. Unless the stenciling on the PCB is 
wrong (highly unlikely), then it's my fault for not following the 
manual. I can't see the PCB stenciling now since the relay covers it.


This explains why I could not tune the 40 metre band. And probably 
explains other things I couldn't do too. I discovered this when I 
started measuring voltages around K1.


This will be difficult to correct. The two relays are flush with the 
board. I can't cut them off since I have no access to their pins. I 
will need to solder suck and wick them out. Fortunately, their pins 
are not bent but straight through their solder pads.


Any tips on removing them would be appreciated. I'm hoping these or 
similar parts are still available.


73,
Murray VA1CQ





__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] FTDI driver on Win10

[Bill Frantz]

I strongly suggest that with any OS, try it first. If it works, 
then you're done. If not then perhaps install a driver or take 
some other action.


After a MacOS upgrade, I lost contact between my computer and 
K3. The cause turned out to be a driver I had installed. The new 
system had a FTDI driver, but it was overridden by my obsolete 
driver. Deleting the old driver fixed things.


73 Bill AE6JV

On 7/3/21 at 7:53 AM, cajo...@gmail.com (C.A. Jones) wrote:


FWIW, I plugged KXUSB into my Win10 Pro PC, and as reported by Dave WO2X,
it operated as intended (communicating with KX3) w/o having to install
drivers.

Quite generally, my modus operandi with stuff like this is to just plug it
in and try it before investigating possible additional required actions.


-
Bill Frantz| The first thing you need when  | Periwinkle
(408)348-7900  | using a perimeter defense is a | 150 
Rivermead Rd #235
www.pwpconsult.com | perimeter. | 
Peterborough, NH 03458


__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] Heil Pro 7 headset with KX3 - RF feedback?

[Drew Arnett]

No luck sorting this out in the field during FD, especially with a
workaround available.  (Alternative mic.)  I'd like to resolve it if
possible before replacing the Pro 7, the KX3, or both.  :-O  So, now
that I'm unpacked at home, I'll try a simple setup for debugging.

Trouble shooting setup now:  KX3 (with new, charged internal NiMH),
Pro 7 with Y cable and that little clip on PTT switch they include, 3
FT coax to (shielded) dummy load.  Electret mic element.  MIC BIAS on,
CMP 0, PWR 5, 14 MHz, SSB.

With MON 0, no RF output indicated while transmitting and speaking or
whistling for MIC GAIN 0 to 80.

With MON 3 (a level I like for CW sidetone) and PTT on, doesn't matter
if I'm speaking/whistling or not.  The RF output indicates nothing
until about MIC GAIN 70 when it abruptly comes up with a harsh sound.
Other electret microphone sounds fine at MIC GAIN 60.

This is probably something simple.  I just haven't found it, yet.

Thanks,

Drew
n7da

On Thu, Jun 17, 2021 at 3:36 AM Drew Arnett  wrote:
>
> Shield of mic jack goes to bare metal Elecraft thoughtfully left on
> the chassis metal.  10 nF shunt to ground.  (Need to see where that
> is, but hopefully SMT and with very small loop area.)  Sheet 9:
> https://ftp.elecraft.com/KX3/Manuals%20Downloads/KX3SchematicDiagramDec2012.pdf
>
> Heil suggests on their tips page generous ferrite choking of all 3
> leads of their Y adapter cable:
> https://heilhamradio.com/support/tips/
>
> Drew
> n7da
>
> On Thu, Jun 17, 2021 at 3:23 AM Drew Arnett  wrote:
> >
> > Hi,
> >
> > In the KX3 for Field Day department, we plan to use it for the GOTA
> > station for phone on HF.  (Yes, will have antennas not on top of each
> > other and bandpass filters on ALL radios.)  Would be great to setup
> > with a headset and foot switch.
> >
> > Last weekend, I used my KX3 barefoot on 6 and with a
> > transverters-store.com transverter (also barefoot) for 2.  6m antenna
> > was 2 elements about 15 ft above the ground and 2m antenna 6 elements
> > at 10 feet above the ground.
> >
> > I worked a couple of contacts on 2m phone with the headset.  Later,
> > when I tried to use the headset for phone on 6, seemed like I was
> > having a feedback problem.  Cabling was the stock cabling that comes
> > with the Heil Pro 7 headset and a footswitch.  Monitor was on and set
> > to 4.
> >
> > So, ALC didn't indicate anything at the normal level (60), and
> > increasing it very abruptly caused horrible sounding audio.  (Yes,
> > acts like positive feedback.)
> >
> > I have a small electret mic on a 1/8 plug thing I bought some time ago
> > from the computer store.  (Meant at the time for adding mic to
> > laptops.)  I have a 1/8" audio extension cable for it.  I plugged that
> > in instead of the headset mic and it seemed to act normally.
> >
> > Is this purely an RF from the TX antenna getting into the mic audio
> > problem or is it something else?
> >
> > Best practice to avoid this problem?
> >
> > On my todo list:
> > - ask here
> > - look at KX3 schematic to see if it has RF ingress mitigation on the mic 
> > jack
> > - ask Heil
> > - unplug the Heil mic element and gator clip my cheap electret mic on
> > instead and try on 6m in driveway with identical antenna/mast/radio
> > setup
> > - look for or assemble an RF filter to inline with the mic jack (tough
> > to do with this little time
> > before field day)
> >
> > Thanks and best regards,
> >
> > Drew
> > n7da
> >
> > ps.  Other than this, KX3 was great in the VHF test.  Worked great
> > with the transverter on 2 and was a lot of fun running barefoot with
> > the sporadic E opening Saturday afternoon & evening.
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] Heil Pro 7 headset with KX3 - RF feedback?

[Walter Underwood]

I don’t know how their Y cable is wired, but a simple wiring will tie the 
logic bias (mic buttons) and mic bias together. That gives a lower bias
voltage and lower mic output for some mics. It also adds some noise, 
because the logic bias isn’t as clean as the mic bias.

You can split out the mic bias with a stereo splitter. Details in this blog 
post:

https://observer.wunderwood.org/2015/08/16/yamaha-cm500-headset-with-ptt-on-elecraft-kx3/
 


wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Jul 3, 2021, at 2:05 PM, Drew Arnett  wrote:
> 
> No luck sorting this out in the field during FD, especially with a
> workaround available.  (Alternative mic.)  I'd like to resolve it if
> possible before replacing the Pro 7, the KX3, or both.  :-O  So, now
> that I'm unpacked at home, I'll try a simple setup for debugging.
> 
> Trouble shooting setup now:  KX3 (with new, charged internal NiMH),
> Pro 7 with Y cable and that little clip on PTT switch they include, 3
> FT coax to (shielded) dummy load.  Electret mic element.  MIC BIAS on,
> CMP 0, PWR 5, 14 MHz, SSB.
> 
> With MON 0, no RF output indicated while transmitting and speaking or
> whistling for MIC GAIN 0 to 80.
> 
> With MON 3 (a level I like for CW sidetone) and PTT on, doesn't matter
> if I'm speaking/whistling or not.  The RF output indicates nothing
> until about MIC GAIN 70 when it abruptly comes up with a harsh sound.
> Other electret microphone sounds fine at MIC GAIN 60.
> 
> This is probably something simple.  I just haven't found it, yet.
> 
> Thanks,
> 
> Drew
> n7da
> 
> On Thu, Jun 17, 2021 at 3:36 AM Drew Arnett  wrote:
>> 
>> Shield of mic jack goes to bare metal Elecraft thoughtfully left on
>> the chassis metal.  10 nF shunt to ground.  (Need to see where that
>> is, but hopefully SMT and with very small loop area.)  Sheet 9:
>> https://ftp.elecraft.com/KX3/Manuals%20Downloads/KX3SchematicDiagramDec2012.pdf
>> 
>> Heil suggests on their tips page generous ferrite choking of all 3
>> leads of their Y adapter cable:
>> https://heilhamradio.com/support/tips/
>> 
>> Drew
>> n7da
>> 
>> On Thu, Jun 17, 2021 at 3:23 AM Drew Arnett  wrote:
>>> 
>>> Hi,
>>> 
>>> In the KX3 for Field Day department, we plan to use it for the GOTA
>>> station for phone on HF.  (Yes, will have antennas not on top of each
>>> other and bandpass filters on ALL radios.)  Would be great to setup
>>> with a headset and foot switch.
>>> 
>>> Last weekend, I used my KX3 barefoot on 6 and with a
>>> transverters-store.com transverter (also barefoot) for 2.  6m antenna
>>> was 2 elements about 15 ft above the ground and 2m antenna 6 elements
>>> at 10 feet above the ground.
>>> 
>>> I worked a couple of contacts on 2m phone with the headset.  Later,
>>> when I tried to use the headset for phone on 6, seemed like I was
>>> having a feedback problem.  Cabling was the stock cabling that comes
>>> with the Heil Pro 7 headset and a footswitch.  Monitor was on and set
>>> to 4.
>>> 
>>> So, ALC didn't indicate anything at the normal level (60), and
>>> increasing it very abruptly caused horrible sounding audio.  (Yes,
>>> acts like positive feedback.)
>>> 
>>> I have a small electret mic on a 1/8 plug thing I bought some time ago
>>> from the computer store.  (Meant at the time for adding mic to
>>> laptops.)  I have a 1/8" audio extension cable for it.  I plugged that
>>> in instead of the headset mic and it seemed to act normally.
>>> 
>>> Is this purely an RF from the TX antenna getting into the mic audio
>>> problem or is it something else?
>>> 
>>> Best practice to avoid this problem?
>>> 
>>> On my todo list:
>>> - ask here
>>> - look at KX3 schematic to see if it has RF ingress mitigation on the mic 
>>> jack
>>> - ask Heil
>>> - unplug the Heil mic element and gator clip my cheap electret mic on
>>> instead and try on 6m in driveway with identical antenna/mast/radio
>>> setup
>>> - look for or assemble an RF filter to inline with the mic jack (tough
>>> to do with this little time
>>> before field day)
>>> 
>>> Thanks and best regards,
>>> 
>>> Drew
>>> n7da
>>> 
>>> ps.  Other than this, KX3 was great in the VHF test.  Worked great
>>> with the transverter on 2 and was a lot of fun running barefoot with
>>> the sporadic E opening Saturday afternoon & evening.
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to wun...@wunderwood.org 

__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman

[Elecraft] K3 on wsjt-x

[doug dietz]

Guys
I have k3 with all the options available except finals. I have installed the 
ftdi driver. The receiver sends frequency and decodes wsjt signals correctly.   
In the wsjt program the cat test turns green and the ptt  works ok. When I call 
cq the transmitter is keyed but no power is sent out. I think I’m in the wrong 
mode. Any  suggestions. I cannot get it to “data a”?  HELP 
WD8Z. Doug

Sent from my iPhone
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] K3 on wsjt-x

[Dave]

Hi Doug,
I transmit using DATA-A mode.  You might also check to be sure you have 
your computer audio feeding the active input port on the K3.


If you get really stuck, send me a not off list, and one of us can call 
the other, and I can talk you thought rig setup.


73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 7/3/21 2:35 PM, doug dietz wrote:

Guys
I have k3 with all the options available except finals. I have installed the 
ftdi driver. The receiver sends frequency and decodes wsjt signals correctly.   
In the wsjt program the cat test turns green and the ptt  works ok. When I call 
cq the transmitter is keyed but no power is sent out. I think I’m in the wrong 
mode. Any  suggestions. I cannot get it to “data a”?  HELP
WD8Z. Doug

Sent from my iPhone
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to d...@nk7z.net


__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] K3 on wsjt-x

[Dave]

To get to DATA-A, use the DATA MD button, it is the long press of AFX.

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 7/3/21 3:20 PM, Dave wrote:

Hi Doug,
I transmit using DATA-A mode.  You might also check to be sure you have 
your computer audio feeding the active input port on the K3.


If you get really stuck, send me a not off list, and one of us can call 
the other, and I can talk you thought rig setup.


73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 7/3/21 2:35 PM, doug dietz wrote:

Guys
I have k3 with all the options available except finals. I have 
installed the ftdi driver. The receiver sends frequency and decodes 
wsjt signals correctly.   In the wsjt program the cat test turns green 
and the ptt  works ok. When I call cq the transmitter is keyed but no 
power is sent out. I think I’m in the wrong mode. Any  suggestions. I 
cannot get it to “data a”?  HELP

WD8Z. Doug

Sent from my iPhone
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to d...@nk7z.net


__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to d...@nk7z.net

__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] K3 on wsjt-x

[Bill Frantz]

It sounds like your audio is not getting to the K3. There are 
many places it can get lost, including wsjt-x, the selection of 
output devices in wsjt-x, the OS audio chain (seen frequently in 
Windows, but also other OSes), and in the K3 -- are you sure 
your computer is connected to the transmit audio.


73 Bill AE6JV

On 7/3/21 at 5:35 PM, doug49...@gmail.com (doug dietz) wrote:

I have k3 with all the options available except finals. I have 
installed the ftdi driver. The receiver sends frequency and 
decodes wsjt signals correctly.   In the wsjt program the cat 
test turns green and the ptt  works ok. When I call cq the 
transmitter is keyed but no power is sent out. I think I’m in 
the wrong mode. Any  suggestions. I cannot get it to “data 
a”?  HELP


---
Bill Frantz| When an old person dies, a   | Periwinkle
(408)348-7900  | library burns. - Joe McGawon | 150 
Rivermead Rd #235
www.pwpconsult.com | Irish Ethnographer   | 
Peterborough, NH 03458


__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] Generic words on temperature

[Francis Belliveau]

Another rule of thumb for those who care.

When you hold a finger on something and it is 10 seconds to pain threshold, 
that location is about 100 degrees F.
This is not an absolute constant, but I have checked it a few times since I was 
told that, and it seems to be true for me.


> On Jun 30, 2021, at 21:36, Geoffrey Feldman  wrote:
> 
> My rule of thumb is that if you can keep your finger on it for a second or
> so without pain, it's not too hot. 
> 
> 
> 
> The ambient temperature is really not the issue as much as whether heat is
> carried off.  I know it's hot in the pacific northwest but I think you can
> still enjoy your gear.  The larger issue is RFI from air conditioners.
> 
> 
> 
> The environmental consideration many people neglect is atmospheric pressure.
> As altitude increases, there is less air to carry the heat away.  People
> sometimes install fans with an idea to sucking out the heat. This is
> actually wrong. The fan should blow ambient air in and the venting for it to
> get out should intend that pressure inside the case be a bit higher than the
> ambient pressure.  More molecules against the hot part, the better.  If you
> read the fine print on electronic specifications you will often (and should
> always) see an atmospheric spec with the heat spec.
> 
> 
> 
> All the above is just rule-of-thumb of course.  There is a lot more to
> cooling electronics than the above but I think these are worth considering.
> 
> 
> 
> Elecraft gear is pretty good at protecting itself as well. If your radio
> cuts out, it's doing its job of living for more fun later.
> 
> 
> 
> W1GCF
> 
> Geoff
> 
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to f.belliv...@comcast.net 

__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] K2 Only 30-metre Band Works

[VA1CQ]

Don,

I took your advice and crushed those two relays. Even doing that, it was 
tough enough to get both relays out and clean out the solder pad holes. 
It's done and the K2 is ready for me to pop in two new relays. I even 
used a couple toothpicks in the process. I confirmed the stenciled 
outlines were correct on the PCB. I've been on the Elecraft site and 
I've got my shopping cart ready with those relays plus a few other spare 
parts.


I powered up the K2 with the two missing relays. Of course, 80 and 40 
metres don't work as expected. But every band from 30 to 10 metres seems 
to be working perfectly now in both receive and transmit. I've never 
been so happy to hear QRM and band noise. The DX is rolling in. The 
trimmer caps work just as they are supposed to in the bandpass filters 
for 20, 17 and 12 metres.


A side benefit is I sure know the K2 circuits better now than I did a 
few days ago after all the time I spent studying the schematics.


I will push on building the various accessories I have while I wait for 
my order to arrive from Elecraft so I can complete the K2 build.


73,
Murray VA1CQ



--
This email has been checked for viruses by AVG.
https://www.avg.com

__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] K3 on wsjt-x

[Don Wilhelm]

Doug,

You have had suggestions on this reflector on how to get in DATA A mode.
As far as audio levels are concerned, I have an article on my website 
www.w3fpr.com that may be helpful.

Scroll the left column to the last entry and click to open the document.

Bottom line is that you must have 4 bars solid on the ALC meter with the 
5th bar flashing.  You may have up to 3 audio level controls to work 
with.  It is best to start with them all set to mid-range, then adjust 
from there.


73,
Don W3FPR

On 7/3/2021 5:35 PM, doug dietz wrote:

Guys
I have k3 with all the options available except finals. I have installed the 
ftdi driver. The receiver sends frequency and decodes wsjt signals correctly.   
In the wsjt program the cat test turns green and the ptt  works ok. When I call 
cq the transmitter is keyed but no power is sent out. I think I’m in the wrong 
mode. Any  suggestions. I cannot get it to “data a”?  HELP
WD8Z. Doug



__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] FTDI driver on Win10

[Mike Dodd]

Thanks for all the info and advice, both here and off-list. I will 
install the current driver from the FTDI website. I've done it several 
times for Elecraft and astronomy equipment, and it's easy. No reason not 
to do it.


73, Mike N4CF

__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] Generic words on temperature

[David Woolley]

100°F is well within the survivable body core temperature range, so it 
should never trigger pain receptors.


In fact, I believe it was defined based on the nominal core body 
temperature of a cow.


Did you mean 100°C?

--
David Woolley


On 04/07/2021 00:03, Francis Belliveau wrote:

Another rule of thumb for those who care.

When you hold a finger on something and it is 10 seconds to pain threshold, 
that location is about 100 degrees F.
This is not an absolute constant, but I have checked it a few times since I was 
told that, and it seems to be true for me.



__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] K2 Only 30-metre Band Works

[jerry]

On 2021-07-03 11:03, VA1CQ wrote:

Any tips on removing them would be appreciated.


*** Crush them with a pair of pointy vise-grips?  Of course, I'd try 
desoldering them first.  Hold the heat on a bit longer than seems 
necessary, because you need to melt that solder all the way to the other 
side of the board.  When the hole is nice and clean around the pin,
take your needlenose pliers and wiggle the pin back & forth.  You'll be 
able to tell when it's really free.  The main catastrophe to avoid is

tearing out the plated through hole.

  If you don't have one, it's hard to beat a Soldapullt.  Get a real 
one, not a clone.


- Jerry KF6VB


__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] K2 Only 30-metre Band Works

[Don Wilhelm]

Jerry,

I have had only marginal success with the Soldapullt, but I have a Hakko 
808 that works very well - with the correct tip it does the job nicely - 
it heats and then you pull the trigger to extract the solder.  Not 
inexpensive, but when I was doing repairs on a daily basis, it was a 
godsend.


73,
Don W3FPR

On 7/3/2021 7:57 PM, jerry wrote:

On 2021-07-03 11:03, VA1CQ wrote:

Any tips on removing them would be appreciated.


*** Crush them with a pair of pointy vise-grips?  Of course, I'd try 
desoldering them first.  Hold the heat on a bit longer than seems 
necessary, because you need to melt that solder all the way to the 
other side of the board.  When the hole is nice and clean around the pin,
take your needlenose pliers and wiggle the pin back & forth. You'll be 
able to tell when it's really free.  The main catastrophe to avoid is

tearing out the plated through hole.

  If you don't have one, it's hard to beat a Soldapullt.  Get a real 
one, not a clone.


    - Jerry KF6VB




__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

[Elecraft] SDR Technology

[Geoffrey Feldman]

Hi Walter,

In response to your comments on my post, the terminology you use and that I
used both appear in various texts to describe the same thing. Not
surprising, we both know what one another mean.  I prefer incident because
quadrature is in relationship to that.  An AM signal would appear on the
incident stream.  Quadrature then is necessary for most (all) of the other
modulation schemes.  In software the in-phase or incident stream appears as
the real part of the complex number. That fits with the idea of incident for
me.  Tomato tomatoe.

 

Actually I meant direct conversion.  I was referring broadly to SDR but
thinking of the KX3 which I own and not the K4 which I am less familiar
with.  I'll have to look at the K4 more carefully but it sounds like its
architecture is what I called Hybrid.  That would make sense given its price
point and less portable size along with better performance.  Would you then
consider the Yaesu FTDX-101D as more similar to your understanding of the K4
architecture (excepting the yaesu rather goofy interface, in my personal
opinion). I expect it's not exactly the same but how would you compare them
from an SDR perspective?  Getting from RF to base band and back to RF is
relatively straight forward. The interesting stuff IMHO is Fast Fourier,
Filters and other fun software stuff.

 

In responding to a list serve, we are writing off the cuff.  If one
understands the other and then has useful discussion, it's good for me.  I
will look over the books I have and review using whatever the more common
and clear terminology is.  I'm by no means an expert and I am learning
myself.  My primary interest is in system architectures.  My interests go
beyond Elecraft. I seek a taxonomy of SDR implementations which might be
helpful in comparing products or understanding innovations.

 

Thanks for the link. I was aware of that among other sources.  Here is one
that I have found helpful: Practical Signal Processing by Mark Owen.  I am
sure you know this link: https://greatscottgadgets.com/sdr/ He mentions
Owen's book as well.  This is also quite good with a discussion of the
Tayloe mixer/detector (again two used terms).
https://www.arrl.org/files/file/Technology/tis/info/pdf/020708qex013.pdf
Here is a discussion of Tayloe that I think is helpful
http://www.norcalqrp.org/files/Tayloe_mixer_x3a.pdf   As for history, if you
look at John Renshaw Carson's original paper on SSB you will see the
concepts of IQ in his calculus.  Here is Wikipedia.
https://en.wikipedia.org/wiki/Single-sideband_modulation   Fun fact, there
is a picture of Einstein, Sarnoff, Steinmetz and others with someone often
falsely claimed to be Tesla. It isn't. It's Carson.

 

Geoff 

W1GCF

 

__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

[Elecraft] K3 Transmit Issue

[K5WA]

Rob,

 

Hopefully, you'll get better answers from others but I'm going to guess that
you meant a 2nd (SUB) receiver and not a "second channel".  I have installed
three 2nd receivers in the K3s I used to own and you need to make sure all
the coax cables are well seated into their proper ports.  It is very easy to
think it is engaged but it just isn't inserted quite enough.  You also need
to make sure the center pins of those cable are not bent if someone has
pressed too hard while misaligned.  I'll assume you also have the upgraded
SYNTH boards (one for the main RX and another for the SUB) as well because
those cables need to be fully seated in the correct ports.  It is easy to
look at the installation picture up-side-down and get the cables backwards.
Double check those.  The second receiver also has a row of pins underneath
it that can be misaligned since it is almost a blind insertion.  Make sure
those pins are correctly engaged.  You might need a dental mirror type
device to actually see it under there.  If you also have the KAT3 tuner,
that's another cable that needs to be checked to ensure it is seated
completely and not missing entirely.

 

I'm sure you'll find the issue after some poking around looking for loose
connections.

 

Good luck,

 

Bob K5WA  

 

 

Message: 9

Date: Sat, 3 Jul 2021 12:34:42 -0400

From: Toast mailto:ma...@toast.net> >

To: elecraft@mailman.qth.net  

Subject: [Elecraft] K3 Transmit Issue

Message-ID: <11d23480-3db4-445b-b92d-a8540f070...@toast.net
 >

Content-Type: text/plain; charset=us-ascii

 

I recently installed the second channel and general coverage receive options
on my k3 with the 100w transmitter.   I have double checked the settings but
get now transmit power.

 

Any ideas on what the issue is?

 

Rob Mantz

NR4B 

 

__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] Generic words on temperature

[C.A. Jones]

Ahh, well, a few comments clarifications, from a guy with 38 years of
experience (HVAC/mechanical and controls engineering) with Carrier air
conditioning.

Opening comment (not really my area of expertise, but I do have moderate
relevant experience), the heat pain threshold is quite variable (between
individuals, and depending on time of day and LOTS of other factors), and
the touch test is probably not a reliable predictor of whether the radio is
"too hot".  My perception is that the Elecraft radios are thermally well
protected, but if really concerned, I think measuring temp with an IR
sensor and comparing it against published limits might be a preferred
approach to assessing it.

As to atmospheric pressure and altitude, these are really separate
variables.  While there is a functional relationship between them, it's not
so strong that for most normal activities (i.e. unless the plan is to climb
K2, Everest or similar) it shouldn't be a significant factor in the
discussion. And FWIW, temp generally decreases with increasing altitude,
which then of course lessens an overheating problem by increasing the heat
transfer driving delta-T.

As to whether it's better to install fans in a blow-thru or a draw-thru
configuration, there's no clear winner for this type of electronics cooling
application.  If condensation was an issue (it's not), the distinction
between these might become significant. Given that, the decision between
these would generally be based on the mechanical layout and on related
testing meant to insure that specific components remain sufficiently cool
in worst case conditions.

(BTW, no way one could hold his finger on a smooth 100C surface for 10
seconds, and no way that same surface at 100F would rise above the heat
pain threshold in 10 sec.)

Chris Jones  -  K2CZ



On Wed, Jun 30, 2021 at 9:37 PM Geoffrey Feldman 
wrote:

> My rule of thumb is that if you can keep your finger on it for a second or
> so without pain, it's not too hot.
>
>
>
> The ambient temperature is really not the issue as much as whether heat is
> carried off.  I know it's hot in the pacific northwest but I think you can
> still enjoy your gear.  The larger issue is RFI from air conditioners.
>
>
>
> The environmental consideration many people neglect is atmospheric
> pressure.
> As altitude increases, there is less air to carry the heat away.  People
> sometimes install fans with an idea to sucking out the heat. This is
> actually wrong. The fan should blow ambient air in and the venting for it
> to
> get out should intend that pressure inside the case be a bit higher than
> the
> ambient pressure.  More molecules against the hot part, the better.  If you
> read the fine print on electronic specifications you will often (and should
> always) see an atmospheric spec with the heat spec.
>
>
>
> All the above is just rule-of-thumb of course.  There is a lot more to
> cooling electronics than the above but I think these are worth considering.
>
>
>
> Elecraft gear is pretty good at protecting itself as well. If your radio
> cuts out, it's doing its job of living for more fun later.
>
>
>
> W1GCF
>
> Geoff
>
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to cajo...@gmail.com
>
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com 

[Elecraft] Elecraft CW Net Announcement

[kevin]

Good Evening,

   The week began with very hot weather.  It peaked on Tuesday at 110 
degrees.  Luckily no one started a fire.  I coped by eating jalapenos 
and drinking a lot of water.  Then it slacked off.  Two days later the 
clouds came back with morning fog.  It did get to 82 today but it felt 
very nice.


    The sun tossed a CME at us but almost missed.  Solar flux is up to 
95 sfu.  I was hoping it would go over 100 too.  The bands should be a 
little stronger with the normal summer noise.  I received three runs of 
coax this week.  Now to craft three more antennas.  The broken antennas 
are ready to become radials.  The main problem with those is all the 
slash lying around.  However, no one says radials have to be totally 
radial.  They just need to form a ground plane so a few zigs and zags to 
avoid large branches should be OK.  That being said it is my only option 
so it will work; it is simply a matter of how well.


Please join us on (or near):

14050 kHz at 2200z Sunday (3 PM PDT Sunday)
  7047 kHz at z Monday (5 PM PDT Sunday)

   73,
  Kevin. KD5ONS


-


  There is a bird who enjoys singing from the top of one of the large 
hemlock trees in the backyard.  I have not been able to see him, only 
hear him.  I decided to record him which brought up the question of 
how.  Audacity is installed on three of my computers, two of them being 
laptops.  So I grabbed one of those and took it out back.  I captured 
twenty minutes of him calling while bees worked the thimble berry 
blossoms.  The built in microphones were fine, I did not need to use my 
separate mikes.  The tracks all had wind noise so I used the app's 
equalizer to mute it.  I could have used other tools to normalize the 
recording but only added a little compression.


  Now I can listen to my mystery bird as I search through the Cornell 
recordings.  The best I can guess so far is it is a warbler.  Its call 
had between five and sixteen phrases in it. Only the first four are 
stable, the rest are variations with the occasional mimic of neighboring 
birds.  If only I could sort sound files then I could write a search 
algorithm to match my bird.  A view of him in flight, or any sort of 
field sign would be nice too.  It may be a long quest.



https://www.audacityteam.org


__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com